MAP SHOWING DISTRIBUTION OF ALKAUNE IGNEOUS ...U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL...
Transcript of MAP SHOWING DISTRIBUTION OF ALKAUNE IGNEOUS ...U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL...
U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY
MISCELLANEOUS HELD STUDIESMAP MF-1835-F
PAMPHLET
MAP SHOWING DISTRIBUTION OF ALKAUNE IGNEOUS ROCKS ANDASSOCIATED CARBONATITES AND PERIDOTITES IN THE
NORTHERN MIDCONTINENT, U.S.A.
Compiled by
F. Allan Hills*, Richard W. Scott, Jr.i, Theodore J. Armbrustmacher1 , and Pieter Berendsen2
INTRODUCTION
This l:l,000,000-scale map of the northern Midcontinent area shows the locations of alkaline igneous rocks and associated carbonatites and mica peridotites, and of structural domes and diatremes known or thought to be associated with similar igneous rocks. In addition, it shows the location of other structural features and geophysical anomalies of uncertain origin that may be related to buried igneous rocks. These include cryptoexplosion features, some of which have been interpreted as astroblemes, and gravity and magnetic anomalies that have been interpreted to result from buried mafic plutons. Precambrian igneous rocks having a wide range of compositions are exposed or buried at shallow depth in South Dakota, Minnesota, and Wisconsin, and they are found beneath the Paleozoic strata throughout the study area. Only those Precambrian rocks that are clearly alkaline, carbonatitic, or kimberlitic are included in this compilation. Table 1 shows a summary of available information on the petrology, structural setting, and age of each occurrence or group of occurrences and lists the principal references for each. Because the authors have not studied most of the occurrences in this compilation, they made no attempt to change the rock terminology to make it consistent or up to date. Generally, the name used for each occurrence is the one in the most recent, cited publication on the occurrence. Figures 1 and 2 are larger scale maps that show the locations of igneous rocks and diatremes where they are clustered too closely to be shown clearly on the main map.
This map is part of a folio of maps and cross sections of the northern Midcontinent area (bounded by lats 36*-46* N. and longs 88'-100* W.) prepared under the Midcontinent Strategic and Critical Minerals Project. This project is a cooperative activity between the U.S. Geological Survey and the
^.S. Geological Survey, Denver, CO 80225. 2Kansas Geological Survey, Lawrence, KS
66044.
geological surveys of the included States. Other maps in this folio to date include U.S. Geological Survey Miscellaneous Field Studies Maps MF-1835-A through E (Mugel, 1986; Jorgensen and others, 1986; Marvin, 1988; Pratt, 1987; Andercon, 1988) and U.S. Geological Survey Miscellaneous Investigations Service Map I-1853-A (Sirrr 1990).
REFERENCES CITED
Amos, D.H., 1967, Geologic map of part of the Smithland quadrangle, LJvingston County, Kentucky: U.S. Geological Survey Geologic Quadrangle Maps of the United States, Map GQ-657, scale 1:24,000.
Anderson, R.R., compiler, 1988, Phanercroic structural features in the northern Midcontinent, U.S.A.: U.S. Geological Survey Miscellaneous Field Studies Map MF-1835-E, scale 1:1,000,000.
Baxter, J.W., Desborough, G.A., and Shew, C.W., 1967, Areal geology of the Illinois fluorspar district, Pt. 3-Herod and Shetlervir? quadrangles: Illinois State Geological Survey Circular 413, 41 p.
Berendsen, P., Cullers, R.L., Mansker, W.L., and Cole, G.P., 1985, Late Cretaceous kimberlite and lamproite occurrences in eastern Kansas, U.S.A.: Geological Society of America Abstracts with Programs, v. 17, no. 3, p. 151.
Bickerman, M., Udiak, E.G., and Lewis, Richard, 1982, K-Ar ages of phlogopite from mica peridotite, Omaha oil field intrusion, Gallatin County, southern Illinois: Geological Society of America Abstracts with Programs v. 14, no. 5, p. 255.
Bickford, M.E., Mose, D.H., Wetherill, G.W., and Franks, P.C., 1971, Metamorphisrr of Precambrian granitic xenoliths in a mica peridotite at Rose dome, Woodson County, Kansas-Part 1, Rb-Sr isotope stud : ?.s: Geological Society of America Bulletin, v. 82, p. 2863-2868.
Brock, M.R., and Heyl, A.V., Jr., 1961, Post- Cambrian igneous rocks of the central craton, western Appalachian Mountains, and Gulf Coastal Plain of the United States, in Short papers in the geologic and hydrologic sciences: U.S. Geological Survey Professional Paper 424-D, p. D33-D35.
Brookins, D.G., 1970a, Kimberlite at Winkler crater, Kansas: Geological Society of America Bulletin, v. 81, p. 241-246.
____1970b, The kimberlites of Riley County, Kansas: Kansas State Geological Survey, Bulletin 200, 32 p.
Brookins, D.G., Delia Valle, R.S., and Bolivar, S.L., 1976, Uranium geochemistry of some United States kimberlltes [abs.]: American Geophysical Union Transactions (EOS), v. 57, p. 762.
Brown, J.S., Emery, J.A., and Meyers, P.A., Jr., 1954, Explosion pipe in test well on Hicks Dome, Hardin County, Illinois: Economic Geology, v. 49, p. 891-902.
Clegg, K.E., 1955, Metamorphism of coal byperidotite dikes in southern Illinois: Illinois Geological Survey Report of Investigations, no. 178, p. 5-18.
Clegg, K.E., and Bradbury, J,C, 1956, Igneous intrusive rocks in Illinois and their economic significance: Illinois Geological Survey Report of Investigations, no. 197, 19 p.
Cordua, W.S., 1985, Rock Elm structure, Pierce County, Wisconsin-A possible cryptoexplosion structure: Geology, v. 13, p. 372-374.
Cullers, R.L., Mullenax, J., Di Marco, M.J., and Nordeng, S., 1982, The trace element content and petrogenesis of kimberlites in Riley County, Kansas, U.S.A.: American Mineralogist, v. 67, p. 223-233.
Cullers, R.L., Ramakrishnan, S., Berendsen, P., and Griffin, T., 1985, Geochemistry and petrogenesis of lamproites, Late Cretaceous age, Woodson County, Kansas, U.S.A.: Geochimica et Cosmochimica Acta, v. 49, no. 6, p. 1383-1402.
Englehardt, R.L., 1973, The petrology of some igneous dikes of western Kentucky: Richmond, Ky., University of Eastern Kentucky M.S. thesis, 59 p.
English, R.M., and Grogan, R.M., 1948, Omaha pool and mica-peridotite intrusives, Gallatin County, Illinois: Illinois Geological Survey Report of Investigations, no. 130, p. 189-212.
Franks, P.C., 1959, Pectolite in mica peridotite, Woodson County, Kansas: American Mineralogist, v. 44, p. 1082-1086.
Greenberg, J.K., and Brown, B.A., 1985,Deformational and metamorphic features associated with 1,500-Ma anorogenic magmatism in Wisconsin, in Tithis, August, ed., The crust-The significance of
granites/gneisses in the lithosphere: Theophrastus Publications, p. 79-93.
Grohskopf, J.G., 1955, Subsurface geology of the Mississippi embayment of southeast Missouri: Missouri Division of Geological Survey and Water Resources [Report], 2nd ser., v. 37, 133 p.
Harlem, C.L., 1982, The Elk Creek Carbonatites, in Schultz, C. B., ed.: Nebraska Academy of Sciences and Affiliated Societies Proceedings, v. 92, p. 48-49.
Hendriks, H.E., 1965, The Crooked Creek structure in Snyder, F.G., and others, Cryptoexplosion structures in Missouri-Geological Society of Amercia Guidebook, 1965 Annual Meeting: State of Missouri Report of Investigations no. 30, p. 68-72.
Heyl, A.V., Jr., and McKeown, F.A., 1978,Preliminary seismotectonic map of the central Mississippi Valley and environs: U.S. Geological Survey Miscellaneous Field Studies Map MF-1011, scale 1:500,000.
Hildenbrand, T.G., Kane, M.F., and Stauder, S.J., 1977, Magnetic and gravity anomalies in the northern Mississippi embayment and their special relation to seismicity: U.S. Geological Survey Miscellaneous Field Studies Map MF- 914, scale 1:1,000,000.
Jorgensen, D.G., Helgesen, J.O., Leonard, R.B., and Signer, D.C., 1986, Equivalent freshwater head and dissolved-solids concentration of water in rocks of Cambrian, Ordovician, and Mississippian age in the northern Midcontinent, U.S.A.: U.S. Geological Survey Miscellaneous Field Studies Map MF-1835-B, scale 1:1,000,000.
Kidwell, A.L., 1947, Post-Devonian igneous activity in southeastern Missouri: State of Missouri Department of Business and Administration, Division of Geological Survey and Water Resources, Report of Investigations no. 4, 83P-
Kisvarsanyi, E.B., and Howe, W.B., 1983a, The southeast Missouri minerals district and its relationship to post-Precambrian igneous activity: Missouri Geological Survey map no. OFM-83-170a-GI, scale 1:250,000.
____1983b, Bee Fork center contoured on the top of the volcaniclastic facies: Missouri Geological Survey map no. OFM-83-170b-GI, scale 1:24,000.
____1983c, Cross section A-A', Bee Fork:Missouri Geological Survey map no. OFM-83- 170C-GI.
____1983d, Isopach map of volcaniclastic facies in the lower Bonneterre Formation along the Viburnum trend (Bee Fork area): Missouri Geological Survey map no. OFM-83-170d-GI, scale 1:24,000.
.1983e, The Bee Fork volcanic center and itsrelationship to the southeast Missouri lead-
zinc district: Geological Society of America Abstracts with Programs, v. 15, no. 6, p. 614.
Kisvarsanyi, E.B., Pratt, W.P., and Heyl, A.V., Jr., 1981, Fluorine-thorium and rare-earth-bearing kimberlitic carbonatite complexes, in Pratt, W.P., ed., Metallic mineral resource potential of the Rolla 1" x 2* quadrangle, Missouri, as appraised in September, 1980: U.S. Geological Survey Open-File Report 81-518, p. 35-40.
Knight, G.L., and Landes, K.K., 1932, Kansaslaccoliths: Journal of Geology, v. 40, p. 1-15.
Koenig, J.B., 1956, The petrography of certain igneous dikes of Kentucky: Kentucky Geological Survey Series 9, Bulletin 21, 57 p.
LaBerge, G.L., and Meyers, P.E., 1983, Precambrian geology of Marathon County, Wisconsin: Wisconsin Geological and Natural History Survey, Information Circular 45, 88 p.
Lewis, Richard, 1982, Petrology and mineralogy of the monticellite alnoite associated with the Omaha oil field, Gallatin County, Illinois: Geological Society of America Abstracts with Programs, v. 14, no. 5, p. 265.
Lockwood, R.P., 1967, Petrologic study of syenites near Wausau, Wisconsin: University of Wisconsin at Madison M.S. thesis, 72 p.
____1970, Petrology of syenites, Wausau,Wisconsin: The Compass of Sigma Gamma Epsilon, v. 48, no. 1, p. 32-44.
Mansker, W.L., Richards, B.D., and Cole, G.P., 1985, A review and comparison of Kansas kimberlites: Geological Society of America Abstracts with Programs, v. 17, no. 3, p. 166.
Marvin, R.F., compiler, 1988, Radiometric ages ofbasement rocks in the northern Midcontinent, U.S.A.: U.S. Geological Survey Miscellaneous Field Studies Map MF-1835-C, scale 1:1,000,000.
McDowell, R.C., Grabowski, G.J., Jr., and Moore, S.L., 1981, Geologic map of Kentucky: U.S. Geological Survey in cooperation with 10th and llth Kentucky Geological Surveys, scale 1:250,000.
Meyer, H.O.A., and Brookins, D.G., 1976,Sapphirine, sillimanite, and garnet in granulite xenoliths from Stockdate kimberlite, Kansas: American Mineralogist, v. 61, p. 1194-1202.
Mugel, D.N., compiler, 1986, Map showing availability of data for selected deep drill holes in the northern Midcontinent, U.S.A: U.S. Geological Survey Miscellaneous Field Studies Map MF-1835-A, scale 1:1,000,000.
Offield, T.W., and Pohn, H.A., 1979, Geology of the Decaturville impact structure, Missouri: U.S. Geological Survey Professional Paper 1042, 48 p.
Pratt, W.P., compiler, 1987, lospach and lithofacies map of the Sauk sequence (excluding basal elastics) in the northern Midcontinent, U.S.A.:
U.S. Geological Survey Miscellaneous Field Studies Map MF-1835-D, scale 1:1,000,000.
Sayeed, U.A., Smith, R., and Carlson, M,P., 1972, Geophysical anomaly around Stella, Richardson Co., Nebraska: Geolcqical Society of America Abstracts with Programs, v. 4, no. 6, p. 407.
Sims, P.K., compiler, 1990, Precambrian basement map of the northern Midcontinent, U.S.A.: U.S. Geological Survey Miscellaneous Investigations Series Map I-1853-A, scale 1:1,000,000.
Snyder, F.G., and Gerdemann, P.E., 1965, Explosive igneous activity along an Illinois-Missouri- Kansas axis: American Journal of Science, v. 263, p. 465^493.
Snyder, F.G., Williams, J.H., and others, 1965, Cryptoexplosive structures in Missouri- Geological Society of America GuHebook, 1965 Annual Meeting: State of Missouri Report of Investigations no. 30, 73 p.
Trace, R.D., 1966, Geologic map of the Marionquadrangle, Crittenden and Caldw^ll Counties, Kentucky: U.S. Geological Surveu Geologic Quadrangle Maps of the U.S., Map GQ-547, scale 1:24,000.
Trace, R.D., and Amos, D.H., 1984, Stratigraphyand structure of the western Kentucky fluorite district: U.S. Geological Survey Professional Paperll51-D,41p.
Treves, S.B., Burchett, R.R., and Low, E.J., 1982, Precambrian investigations in eastern Nebraska: Geological Society of America Abstracts with Programs, v. 14, ro. 3, p. 138.
Wagner, H.C., 1954, Geology of the Fredoniaquadrangle, Kansas: U.S. Geolog'cal Survey Geologic Quadrangle Map GQ-49, scale 1:62,500.
Wagner, R.E. and Kisvarsanyi, E.B., 1969, Lapilli tuffs and associated pyroclastic sediments in Upper Cambrian strata along Dent Branch, Washington County, Missouri: Missouri Geological Survey and Water Resources Report of Investigations no. 43, 80 p.
Weller, J.M., Grogan, R.M., and Tippie, F.E., 1952, Geology of the fluorspar deposits of Illinois: Illinois State Geological Survey Bu"etin 76, 147 p.
Weller, Stuart, and Sutton, A.H., 1951, Geology of the western Kentucky fluorspar district: U.S. Geological Survey Mineral Investigations Field Studies Map MF-2, scale 1:24,000.
Willman, H.B., and others, compilers, 1967, Geologic map of Illinois: Illinois State Geological Survey, scale 1:500,000.
Zartman, R.E., Brock, M.R., Heyl, A.V., Jr., andThomas, H.H., 1967, K-Ar and RV Sr ages of some alkalic intrusive rocks from central and eastern United States: American .Journal of Science, v. 265, p. 848-870.
Tab
le 1
. Sum
mar
y of
pet
rolo
gy,
stru
ctur
al i
nfor
mat
ion,
and
pri
mar
y re
fere
nces
on
alka
line
igne
ous
rock
s, c
arbo
natit
es,
and
peri
doti
tes
in t
he n
orth
ern
Mid
cont
inen
t ar
ea
[Lea
ders
(-)
, in
form
atio
n no
t av
aila
ble]
Loca
lity
Roc
k ty
pe
No.
Feat
ure
or
stru
ctur
eD
escr
iptio
nR
efer
ence
s
AR
KA
NSA
SG
reen
e C
ount
y:
GR
1M
agne
tic a
nd
grav
ity a
nom
aly.
Maf
ic o
r ul
tram
afic
int
rusi
on i
terp
rete
d fr
om m
agne
tic a
nd
grav
ity a
nom
alie
s.H
ilden
bran
d an
d ot
hers
(1
977)
.
ILLI
NO
ISFr
ankl
in C
ount
v:
FR
1M
afic
alk
alin
e ig
neou
s ro
ck.
Gal
latin
Cou
ntv.
Om
aha
dom
e:
GA
1
Mic
a pe
ridot
ite
Dik
e
Dik
es a
nd s
ills
Gal
latin
Cou
ntv.
Sha
wne
etow
n di
kes:
GA
2
Igne
ous
rock
D
ike
GA
3
Igne
ous
rock
-
GA
4
Igne
ous
rock
-
GA
5
Igne
ous
rock
-
GA
6
Igne
ous
rock
-
Har
din
Cou
nty,
Hic
ks D
ome
and
near
by a
reas
:
HA
1
- D
iatre
me
or p
lug
Igne
ous
rock
s pe
netr
ated
by
drill
hol
es in
Om
aha
oil f
ield
. Sm
all d
ikes
and
sill
s ne
ar s
urfa
ce d
escr
ibed
as
serp
entin
ized
mic
a pe
ridot
ite.
Two
thic
k sil
ls of
m
ontic
ellit
e al
noite
at
unsp
ecifi
ed d
epth
acc
ount
for
st
ruct
ural
rel
ief
of t
he O
mah
a do
me.
Pe
rovs
kite
, m
elan
ite,
and
Cr-
mag
netit
e re
port
ed in
aln
oite
.
Drill
hol
e pe
netr
atin
g un
desc
ribed
ign
eous
roc
k
Drill
hol
e pe
netr
atin
g un
desc
ribed
ign
eous
roc
k
Drill
hol
e pe
netr
atin
g un
desc
ribed
ign
eous
roc
k
Dril
l hol
e pe
netr
atin
g un
desc
ribed
ign
eous
roc
k
Hey
l an
d M
cKeo
wn
(197
8).
Bic
kerm
an a
nd o
ther
s,
(198
2);
Cle
gg a
nd
Bra
dbur
y (1
956)
; En
glis
h an
d G
roga
n (1
948)
; Le
wis
(198
2).
Will
man
and
oth
ers
(196
7).
Cle
gg a
nd B
radb
ury
(195
6).
Cle
gg a
nd B
radb
ury
(195
6).
Cle
gg a
nd B
radb
ury
(195
6).
Cle
gg a
nd B
radb
ury
(195
6).
Will
man
and
oth
ers
(196
7).
HA
2
Igne
ous
rock
Dik
es a
nd u
ncla
ssifi
ed
mas
ses.
Two
dike
s an
d tw
o ig
neou
s m
asse
s of
unc
erta
in f
orm
Cle
gg a
nd B
radb
ury
(195
6).
HA
S Ig
neou
s ro
ck
HA
4
Bre
ccia
con
tain
ing
igne
ous
rock
fr
agm
ents
.
HA
S
HA
6
HA
7
Bre
ccia
con
tain
ing
igne
ous
rock
fr
agm
ents
and
ig
neou
s m
iner
als.
Mic
a pe
ridot
ite,
lam
prop
hyre
.
Bre
ccia
Alte
red
mic
a pe
ridot
ite o
r la
mpr
ophy
re.
Har
din
Cou
nty.
Ros
icla
re d
ikes
:
HA
8
Bre
ccia
Alte
red
mic
a pe
ridot
ite.
Phila
delp
hia
Scho
ol
dike
.
Plug
or
diat
rem
e of
Sp
arks
Hill
.
Plug
s or
dia
trem
es
of H
icks
dom
e.
Dik
es o
f H
icks
dom
e
Plug
or
diat
rem
e (G
rant
s pl
ug o
f C
legg
and
B
radb
ury,
195
6).
Cry
stal
dik
e
Plug
or
diat
rem
e (S
owar
d pl
ug).
Arg
o di
kes
Ang
ular
to
suba
ngul
ar f
ragm
ents
of
rock
(ch
iefly
sed
imen
ta
ry b
ut s
ome
frag
men
ts o
f ig
neou
s an
d m
etam
orph
ic
rock
s fr
om b
asem
ent a
nd p
ossi
bly
from
man
tle)
in h
ighl
y al
tere
d m
atrix
con
tain
ing
angu
lar
frag
men
ts o
f qu
artz
, m
usco
vite
, pl
agio
clas
e, a
nd m
icro
clin
e.
(N1/
2NE
1/4
sec.
13,
T.
US
., R
. 8 E
.)
Frag
men
ts o
f ch
ert
and
silic
ified
roc
ks in
fin
e-gr
aine
d qu
artz
cem
ent,
and
frag
men
ts o
f se
dim
enta
ry r
ocks
in
mat
rix o
f fin
ely
grou
nd r
ock
and
quar
tz.
Con
tain
s ap
atite
gra
ins
and
rock
fra
gmen
ts t
houg
ht t
o be
ig
neou
s.
(Sec
. 30
. T.
11
S.,
R. 8
E.)
Frag
men
ts o
f m
etam
orph
osed
sed
imen
tary
roc
k an
d la
rge
piec
es o
f ho
rnbl
ende
and
bio
tite
(as
long
as
2.5
cm)
and
augi
te in
mat
rix o
f ca
lcite
with
ang
ular
qua
rtz a
nd
feld
spar
. (N
W1/
4NW
1/4
sec.
6, T
. 12
S.,
R. 8
E.)
K-A
r ag
es:
horn
blen
de 2
8111
4 M
a, b
iotit
e 25
8±13
Ma.
Fine
-gra
ined
cal
cite
with
sca
ttere
d ap
atite
. D
ike
15 c
m
wid
e in
roo
f of
flu
orsp
ar m
ine.
(S
haft
No.
4,
Cry
stal
M
ine,
SE
1/4N
E1/
4 se
c. 3
4, T
. 11
S.,
R. 9
E.)
Ang
ular
to
suba
ngul
ar f
ragm
ents
of
igne
ous
and
sedi
men
ta
ry r
ock
in h
ighl
y al
tere
d m
atrix
. A
ltere
d fr
agm
ents
of
mic
a, q
uartz
, pla
gioc
lase
, and
mic
rocl
ine.
(N
E1/
4SW
1/4
sec.
31,
T.
12 S
., R.
8 E
.)
Dik
es,
3-60
cm
wid
e, i
n flu
orsp
ar m
ine
on A
rgo
vein
. Fi
ne
grai
ned,
dirt
y ca
lcite
with
abu
ndan
t ap
atite
and
sca
ttere
d,
tart
ly c
hbri
tizad
bio
tite.
(N
E1 '4
SW
1/4
sec.
3%
T.
12
S.,
R. 8
E.)
Cle
gg a
nd B
radb
ury
(195
6).
Cle
gg a
nd B
radb
ury
(195
6);
A.V
. H
eyl,
Jr.
(ora
l co
mm
un.,
1987
).
Bro
wn
and
othe
rs (
1954
); C
legg
and
Bra
dbur
y (1
956)
.
Cle
gg a
nd B
radb
ury
(195
6).
Cle
gg a
nd B
radb
ury
(195
6);
Zartm
an a
nd o
ther
s (1
967)
.
Cle
gg a
nd B
radb
ury
(195
6).
Cle
gg a
nd B
radb
ury
(195
6).
Cle
gg a
nd B
radb
ury
(195
6).
Tab
le 1
. Sum
mar
y o
f pe
trol
ogy,
str
uctu
ral
info
rmat
ion,
and
pri
mar
y re
fere
nces
on
alka
line
igne
ous
rock
s, c
arbo
natit
es,
and
peri
doti
tes
in t
he n
orth
ern
Mid
cont
inen
t ar
ea
Co
nti
nu
ed
Loca
lity
No.
Roc
k ty
peFe
atur
e or
st
ruct
ure
Des
crip
tion
Ref
eren
ces
ILL
INO
IS C
ontin
ued
Har
din
Coun
ty;.
Ros
icla
re d
ikes
Con
tinue
d:
Goo
d H
ope
dike
Alte
red
mic
a pe
ridot
ite.
Alte
red
mic
a pe
ridot
ite.
Alte
red
mic
a pe
ridot
ite.
Alte
red
mic
a pe
ridot
ite.
Dik
e of
Orr
's La
ndin
g.
Unn
amed
dik
es
Dow
ney'
s Bl
uff
sill
Pope
Cou
nty,
Hic
ks d
ome
area
:
PO
1 B
recc
ia
Dia
trem
e or
plu
g
PO 2
B
recc
ia
PO
3 Ig
neou
s ro
ck
Pope
Cou
nty,
. D
ike$
:
PO 4
M
ica
perid
otite
Dia
trem
e or
plu
g
Unc
lass
ified
ign
eous
m
ass.
Mix
dik
e
Dik
e as
thic
k as
30
cm o
n G
ood
Hop
e ve
in in
flu
orsp
ar
min
e.
Chl
orite
and
qua
rtz w
ith a
bund
ant a
patit
e.
(NE
1/4N
W1/
4 se
c. 5
, T.
13 S
., R.
8 E
.)
Larg
e cr
ysta
ls o
f ca
lcite
and
les
s co
mm
only
of
serp
entin
e in
fin
e-gr
aine
d ca
rbon
ate
grou
ndm
ass.
A
bund
ant a
patit
e.
(SW
1/4N
E1/
4 se
c. 3
3, T
. 12
S.,
R. 8
E.)
Dik
es in
dia
mon
d dr
ill h
ole
at d
epth
s of
290
-375
m.
Mic
a an
d fe
w la
rge
augi
te g
rain
s in
gro
undm
ass
of
carb
onat
e an
d m
inor
ser
pent
ine.
A
bund
ant a
patit
e.
(NW
1/4S
W1/
4 se
c. 3
2, T
. 12
S.,
R. 8
E.)
Thin
ana
stom
osin
g sil
l in
lim
esto
ne o
utcr
op.
Aug
ite a
nd
mic
a cr
ysta
ls in
car
bona
te g
roun
dmas
s.
Abu
ndan
t ap
atite
. B
iotit
e K
-Ar a
ge 2
69±1
3 M
a.
Inco
mpl
etel
y de
scrib
ed.
Show
n as
dik
e by
Will
man
and
ot
hers
(19
67).
Tes
t pi
t un
cove
red
boul
ders
of
gran
itic
rock
.
Partl
y se
rpen
tiniz
ed o
livin
e, m
ica,
aug
ite,
and
apat
ite
pres
ent i
n bo
ulde
rs.
(NE
1/4N
E1/
4, s
ec.
18, T
. 13
S.,
R. 7
E.)
Cle
gg a
nd B
radb
ury
(195
6).
Cle
gg a
nd B
radb
ury
(195
6).
Cle
gg a
nd B
radb
ury
(195
6).
Cle
gg a
nd B
radb
ury
(195
6);
Zartm
an a
nd o
ther
s (1
967)
.
Bax
ter
and
othe
rs (
1967
); W
illm
an a
nd o
ther
s.
Bax
ter
and
othe
rs (
1967
); W
illm
an a
nd o
ther
s (1
967)
.
Cle
gg a
nd B
radb
ury
(195
6);
Wel
ler
and
othe
rs (
1952
); W
illm
an a
nd o
ther
s (1
967)
.
Cle
gg a
nd B
radb
ury
(195
6).
PO 5
M
ica
perid
otite
Gol
cond
a di
keC
legg
and
Bra
dbur
y (1
956)
.
Salin
e C
ount
y r E
ldor
ado
dike
s:
SA 1
Ig
neou
s ro
ck
Dik
es(?
)
SA 2
M
ica
perid
otite
SA 3
Ig
neou
s ro
ck
SA 4
M
ica
perid
otite
SA 5
Ig
neou
s ro
ck
Will
iam
son
Cou
nty:
WM
1
Mic
a pe
ridot
ite
Der
ing
dike
s
Dik
es(?
)
Dik
es
Dik
es
Abs
her
dike
s
Serp
entin
e an
d m
ica
with
min
or p
yrox
ene
and
apat
ite.
Kno
wn
from
bou
lder
s fr
om o
ld p
rosp
ect p
it.
(SW
1/4N
E1/
4 se
c. 2
5, T
. 13
S.,
R. 6
E.)
Seve
ral u
ndes
crib
ed d
ikes
or
sills(
?).
One
is 1
50 m
long
, ab
out
10 m
wid
e, a
nd c
uts
Penn
sylv
ania
n ro
cks;
ano
ther
is
mor
e th
an 1
,200
m lo
ng.
K-A
r age
261
±9 M
a.
Dik
es in
coa
l min
e.
As
thic
k as
5 m
. La
rge
grai
ns o
f se
rpen
tine
and
partl
y ch
lorit
ized
mic
a in
gro
undm
ass
of
serp
entin
e an
d ch
lorit
e.
Min
or a
patit
e.
(SE
1/4N
E1/
4 se
c. 2
4, T
. 8
S.,
R. 6
E.)
Und
escr
ibed
, nu
mer
ous
dike
s an
d sil
ls(?)
Seve
ral d
ikes
in c
oal m
ine.
La
rge
grai
ns o
f se
rpen
tine
in
grou
ndm
ass
of c
hlor
ite a
nd s
erpe
ntin
e.
Scat
tere
d cl
inop
yrox
ene
and
mic
a.
Abu
ndan
t apa
tite.
(S
E1/
4NE
1/4
sec.
17,
T.9
S.,
R. 6
E.)
Mai
nly
unde
scrib
ed d
ikes
. Jo
hn N
elso
n (w
ritte
n co
mm
un.,
1987
) re
port
ed m
ica
perid
otite
dik
e, 5
-6 m
wid
e, in
coa
l m
ine.
Se
vera
l sm
all d
ikes
par
alle
l lar
ger
dike
, whi
ch s
trike
s ab
out N
. 35*
W.
A 3
0-cm
-wid
e di
ke o
f ca
rbon
ate
rock
st
rikes
nor
thea
st.
Mag
netic
sur
vey
sugg
ests
con
tinua
tion
of d
ike
for a
bout
3.2
km
. (S
E1/
4 se
c. 1
1, T
. 20
S.,
R. 5
E.)
Two
para
llel d
ikes
, 0.3
-5.2
m w
ide,
in a
band
oned
stri
p m
ine.
C
legg
and
Bra
dbur
y (1
956)
; Ph
enoc
ryst
s of
mic
a an
d pa
rtly
serp
entin
ized
oliv
ine
and
Cle
gg (
1955
). hy
pers
then
e in
gro
undm
ass
of b
iotit
e, c
hlor
ite,
and
apat
ite.
Cle
gg a
nd B
radb
ury
(195
6);
John
Nel
son
(writ
ten
com
mun
., 19
87).
Cle
gg a
nd B
radb
ury
(195
6).
Cle
gg a
nd B
radb
ury
(195
6),
Cle
gg a
nd B
radb
ury
(195
6).
Cle
gg a
nd B
radb
ury
(195
6);
Will
man
and
oth
ers
(196
7)
Tab
le 1
. S
um
mar
y o
f pe
trol
ogy,
str
uctu
ral
info
rmat
ion,
and
pri
mar
y re
fere
nces
on
alka
line
igne
ous
rock
s, c
arbo
natit
es,
and
peri
doti
tes
in t
he n
orth
ern
Mid
cont
inen
t ar
ea
Co
nti
nu
ed
Loca
lity
No.
Roc
k ty
peFe
atur
e or
st
ruct
ure
Des
crip
tion
Ref
eren
ces
KA
NSA
SRi
lev
Cou
ntu:
RI 1
Mic
aceo
us k
imbe
rlite
D
iatre
me
or p
ipe
R12
Lam
prop
hyric
ki
mbe
rlite
.D
iatre
me
or p
ipe
00
RI3
Lam
prop
hyric
ki
mbe
rlite
.D
iatre
me
or p
ipe
Circ
ular
stru
ctur
e 30
0 m
in
diam
eter
with
rel
ief
of a
bout
B
rook
ins
(197
0a,
b);
15 m
. O
rigin
ally
cal
led
Win
kler
cra
ter
and
thou
ght t
o be
B
eren
dsen
and
oth
ers
an a
stro
blem
e.
Dril
ling
and
trenc
hing
rev
eale
d ki
mbe
rlite
(1
985)
. m
ixed
with
fra
gmen
ts o
f co
untr
y ro
ck.
Pyro
clas
tic
mat
eria
l in
dica
tes
that
kim
berli
te r
each
ed t
he C
reta
ceou
s su
rfac
e.
Min
eral
s in
kim
berii
te-b
earin
g zo
nes
are:
ch
lorit
ized
phl
ogop
ite,
fors
terit
ic o
livin
e, k
elyp
hitiz
ed
pyro
pe,
dino
pyro
xene
, or
thop
yrox
ene,
ilm
enite
, pe
rovs
kite
, m
agne
tite-
bear
ing
serp
entin
e, a
nd a
patit
e.
Ran
dolp
h N
o. 1
kim
berli
te f
orm
s a
3-m
-hig
h kn
oll a
bout
60
Cul
lers
and
oth
ers
(198
2).
m in
dia
met
er.
Lim
esto
ne c
ount
ry r
ocks
are
upw
arpe
d at
co
ntac
t but
sho
w n
o co
ntac
t m
etam
orph
ism
. K
imbe
rlite
sh
ows
min
imum
bre
ccia
tion,
is
porp
hyrit
ic,
and
cont
ains
as
muc
h as
25
perc
ent
phen
ocry
sts.
Ph
enoc
ryst
s ar
e se
rpen
tin
e, c
alci
te, h
emat
ite, a
nd b
lack
oxi
des
that
form
ed f
rom
ol
ivin
e an
d py
roxe
ne.
Gro
undm
ass
is f
ine-
grai
ned
lizar
dite
, ca
lcite
, an
d iro
n ox
yhyd
roxi
des.
C
onta
ins
few
xen
olith
s.
Ran
dolp
h N
o. 2
kim
berli
te fo
rms
a to
pogr
aphi
c hi
gh 1
5 m
in
dia
met
er.
Con
tact
s w
ith c
ount
ry r
ock
wer
e ex
pose
d by
tren
chin
g an
d dr
illin
g.
Pipe
app
ears
to h
ave
a m
ushr
oom
-like
cap
ind
icat
ing
that
kim
berli
te m
ay h
ave
have
intru
ded
to th
e su
rfac
e.
Com
posi
tion
sim
ilar
to
kim
berli
te o
f the
Ran
dolp
h N
o. 1
. Fe
w x
enol
iths
and
few
meg
asco
pic
pseu
dom
orph
s of
ser
pent
ine
afte
r ol
ivin
e.
Pyro
pe a
nd p
hlog
opite
abs
ent.
Cul
lers
and
oth
ers
(198
2);
Bro
okin
s (1
970b
).
RI 4
M
icac
eous
kim
berli
te
Dia
trem
c or
pip
e
RI 5
M
icac
eous
kim
berli
te
Dia
trem
e or
pip
e
RI 6
La
mpr
ophy
ric
kim
berli
te.
Dia
trem
e or
pip
e
RI 7
RI 8
Kim
berli
te
Kim
berli
te
Dia
trem
e or
pip
e
Dia
trem
e or
pip
e
RI 9
RI 1
0
Kim
berli
te
Kim
berli
te
Dia
trem
e or
pip
e
Dia
trem
e or
pip
e
Kim
berli
te n
ear
Leon
ardv
ille
is po
orly
exp
osed
in t
wo
smal
l m
ound
s. Tr
ench
es e
xpos
e a
stee
ply
dipp
ing
cont
act
with
co
untry
roc
k.
Kim
berli
te is
por
phyr
itic
and
cont
ains
as
muc
h as
30
perc
ent p
heno
crys
ts (
as la
rge
as 5
mm
) of
ol
ivin
e an
d py
roxe
ne, a
ltere
d to
cal
cite
, ser
pent
ine,
or
mag
netit
e, w
ith a
few
phe
nocr
ysts
of
pyro
pe,
phlo
gopi
te,
and
mag
netit
e.
Fine
-gra
ined
gro
undm
ass
of s
erpe
ntin
e w
ith le
sser
phl
ogop
ite, o
paqu
e ox
ides
, ca
lcite
, and
gar
net.
As
muc
h as
10
perc
ent x
enol
iths
of s
hale
con
tain
ing
finel
y di
ssem
inat
ed c
alci
te.
Kim
berli
te n
ear
Stoc
kdal
e cr
ops
out i
n a
stre
am b
ed a
nd
is th
orou
ghly
bre
ccia
ted
and
porp
hyrit
ic,
with
as
muc
h as
20
per
cent
phe
nocr
ysts
(as
larg
e as
2 m
m)
of s
erpe
ntin
e (p
seud
omor
phou
s af
ter
oliv
ine
and
pyro
xene
) an
d ph
logo
pite
, in
a fin
e-gr
aine
d m
atrix
of
lizar
dite
with
min
or
calc
ite a
nd b
lack
oxi
des.
Con
tain
s ab
out
20 p
erce
nt
alte
red
xeno
liths
of d
unite
, ecl
ogite
, gab
bro,
am
phib
olite
, gr
anul
ite, I
herz
olite
, phy
llite
, and
sha
les.
Kim
berli
te a
t Bal
a fo
rms
a kn
oll 4
-5 m
hig
h an
d ab
out 6
0 m
in
dia
met
er.
It is
porp
hyrit
ic w
ith a
s m
uch
as 3
0 pe
rcen
t ph
enoc
ryst
s (a
s la
rge
as 2
mm
) of
oliv
ine
and
pyro
xene
(m
ostly
alte
red
to s
erpe
ntin
e, c
alci
te,
and
mag
netit
e) a
nd
a fe
w p
heno
crys
ts o
f py
rope
. G
roun
dmas
s is
serp
entin
e,
calc
ite, o
paqu
e ox
ides
, and
hem
atite
. C
onta
ins
few
xe
nolit
hs a
nd is
min
imal
ly b
recc
iate
d.
Kim
berli
te m
ass,
calle
d Lo
ne T
ree
A, i
s no
t exp
osed
at
surf
ace.
Sh
arpl
y di
ppin
g co
ntac
t with
cou
ntry
roc
k w
as e
xpos
ed b
y tre
nchi
ng.
Loca
ted
appr
oxim
atel
y 60
0 m
nor
thw
est o
f ki
mbe
rlite
nea
r St
ockd
ale.
Kim
berli
te m
ass,
calle
d Lo
ne T
ree
B, w
as e
xpos
ed b
y tre
nchi
ng.
Tren
ches
rev
eal a
ste
eply
dip
ping
con
tact
w
ith c
ount
ry r
ock.
Th
is m
ass
is sm
alle
r th
an L
one
Tree
A
mas
s, an
d is
loca
ted
abou
t 25
0 m
nor
thw
est o
f Lo
ne
Tree
A m
ass.
Kim
berli
te a
t Sw
ede
Cre
ek is
a s
mal
l mas
s an
d is
not
expo
sed
at s
urfa
ce.
Tren
ches
exp
osed
wea
ther
ed
kim
berli
tic m
ater
ial
and
a co
ntac
t with
cou
ntry
rock
.
Kim
berli
te a
t Fa
ncy
Cre
ek is
exp
osed
at s
urfa
ce,
but i
s m
ostly
cov
ered
by
a fa
rm p
ond.
K
imbe
rlite
mas
s is
abou
t 10
0 m
in d
iam
eter
and
has
a r
ough
ly c
ircul
ar o
utlin
e.
Bro
okin
s (1
970b
); C
ulle
rs
and
othe
rs (
1982
).
Bro
okin
s (1
970b
); C
ulle
rs
and
othe
rs (
1982
); M
eyer
an
d B
rook
ins
(197
6).
Bro
okin
s (1
970b
); C
ulle
rs
and
othe
rs (
1982
).
Ber
ends
en a
nd o
ther
s (1
985)
; M
ansk
er a
nd
othe
rs (
1985
).
Ber
ends
en a
nd o
ther
s (1
985)
; M
ansk
er a
nd
othe
rs (
1985
).
Ber
ends
en a
nd o
ther
s (1
985)
; M
ansk
er a
nd
othe
rs (
1985
).
Ber
ends
en a
nd o
ther
s (1
985)
; M
ansk
er a
nd
othe
rs (
1985
).
Tab
le 1
. Sum
mar
y o
f pe
trol
ogy,
str
uctu
ral
info
rmat
ion,
and
pri
mar
y re
fere
nces
on
alka
line
igne
ous
rock
s, c
arbo
natlt
es,
and
peri
doti
tes
in t
he n
orth
ern
Mid
cont
inen
t ar
ea
Conti
nued
Loca
lity
No.
Roc
k ty
peFe
atur
e or
st
ruct
ure
Des
crip
tion
Ref
eren
ces
KA
NSA
S C
ontin
ued
Wils
on a
nd W
oods
on C
ount
ies:
WI
1 La
mpr
oite
Silv
er C
ity d
ome,
sil
ls.
Woo
dson
Cou
ntv:
WO
1
Lam
proi
teR
ose
dom
e
WO
2N
eosh
o do
me
WO
3D
ome
Sills
of
mic
a pe
ridot
ite a
s m
uch
as 9
m th
ick
intru
de
Penn
sylv
ania
n sh
ales
. R
ock
is po
rphy
ritic
, co
nsis
ting
of e
uhed
ral
to s
ubhe
dral
phl
ogop
ite, d
iops
ide,
pot
assi
c ric
hter
ite,
anhe
dral
ser
pent
ine
pseu
dom
orph
s af
ter
oliv
ine,
and
chr
ome
spin
el in
a g
roun
dmas
s of
mos
tly
serp
entin
e.
Acc
esso
ry m
iner
als
are
pero
vski
te,
apat
ite,
and
mag
netit
e.
Sills
con
tain
a f
ew g
rani
tic x
enol
iths.
U
ltram
afic
roc
ks o
f W
ilson
and
Woo
dson
Cou
ntie
s di
ffer
fro
m t
hose
of
Rile
y C
ount
y in
tha
t th
ey a
re n
ot
exte
nsiv
ely
mic
robr
ecci
ated
and
con
tain
les
s th
an 5
pe
rcen
t xen
olith
s.
Bio
tite
K-A
r age
s ab
out
90±5
Ma.
Roc
ks d
isco
vere
d by
dril
ling
are
petro
grap
hica
lly s
imila
r to
tho
se o
f Si
lver
City
dom
e.
Mas
s in
trude
s Pe
nnsy
l va
nian
sha
le a
nd c
onta
ins
a fe
w g
rani
tic x
enol
iths
date
d at
abo
ut 1
,200
Ma.
M
iner
als
in u
ltram
afic
roc
ks in
clud
e 25
per
cent
or
mor
e eu
hedr
al to
sub
hedr
al p
hlog
opite
and
le
ss t
han
5 pe
rcen
t ea
ch o
f an
hedr
al o
livin
e, e
uhed
ral t
o su
bhed
ral d
iops
idic
aug
ite, a
nd p
leoc
hroi
c eu
hedr
al to
sub
he
dral
am
phib
ole
phen
ocry
sts
in d
olom
itize
d, s
erpe
ntin
ized
gr
ound
mas
s.
Roc
k co
ntai
ns m
inor
apa
tite,
mag
netit
e,
and
iron-
rich
chro
mite
. B
iotit
e K
-Ar a
ge 8
8±4
Ma.
Dril
ling
in 1
927
reve
aled
an
ellip
tical
dom
e in
Mis
siss
ippi
an
sedi
men
tary
roc
ks,
but
no i
gneo
us r
ocks
wer
e fo
und.
H
ighl
y si
liceo
us r
ecry
stal
lized
roc
ks n
ot n
orm
ally
fou
nd
in l
ocal
sec
tion
sugg
est
a de
eper
ign
eous
mas
s.
Qua
rtzite
, m
agne
tite,
pyr
ite,
chal
copy
rite,
and
che
rt
wer
e no
ted
in d
rill c
uttin
gs.
Smal
l, w
ell-d
efin
ed d
ome.
H
ighl
y sil
icifi
ed d
rill c
uttin
gs,
sim
ilar
to t
hose
fro
m N
eosh
o do
me,
con
tain
ed m
agne
tite.
D
ome
has
clos
ure
of a
bout
8 m
and
stru
ctur
al r
elie
f of
ab
out
18 m
.
Kni
ght
and
Land
es (
1932
); B
ickf
ord
and
othe
rs (
1971
) Za
rtman
and
oth
ers
(196
7)
Wag
ner
(195
4);
Fran
ks
(195
9);
Snyd
er a
nd
Ger
dem
ann
(196
5);
Cul
ler
and
othe
rs (
1985
).
Kni
ght
and
Land
es (
1932
); B
ickf
ord
and
othe
rs
(197
1);
Zartm
an a
nd
othe
rs (
1967
); Sn
yder
an
d G
erde
man
n (1
965)
; C
ulle
rs a
nd o
ther
s (1
985)
.
Kni
ght
and
Land
es (
1932
); Sn
yder
and
Ger
dem
ann
(196
5).
Kni
ght
and
Land
es (
1932
).
KE
NT
UC
KY
Cri
ttend
en C
ount
y, H
ardi
n K
nob
dike
s:
CR
1
Lam
prop
hyre
D
ikes
Cri
ttend
en C
ount
y. C
aldw
ell
Spri
ngs
dike
:
CR
2
Peri
dotit
e D
ike
Liv
ings
ton
Cou
nty:
LI 1
L
ampr
ophy
re
Dik
es
Bas
ed o
n ge
nera
lized
des
crip
tion
of d
ikes
on
cite
d m
aps.
D
ark-
gray
, fin
e- to
med
ium
-gra
ined
, ho
locr
ysta
lline
la
mpr
ophy
re,
abun
dant
bio
tite,
dol
omite
, an
d ca
lcite
, an
d m
inor
mag
netit
e, l
euco
xene
, m
arca
site
, flu
orap
atite
, an
drad
ite,
pero
vski
te,
and
goet
hite
. M
any
dike
s co
ntai
n ab
unda
nt c
hlor
ite a
nd s
erpe
ntin
e.
Qua
rtz is
pre
sent
in
and
asso
ciat
ed w
ith v
eins
. D
ike
loca
tions
on
area
ge
olog
ic m
aps
and
in o
ther
rep
orts
are
not
con
sist
ent.
Wea
ther
ed p
erid
otite
, ab
out
1.5
m t
hick
Bas
ed o
n ge
nera
lized
des
crip
tion
of a
ll di
kes
on c
ited
map
s.
Dar
k-gr
ay,
fine-
to m
ediu
m-g
rain
ed, m
uch-
alte
red,
ho
locr
ysta
lline
lam
prop
hyre
. B
ulk
of a
ltere
d ro
cks
is ca
lcite
with
abu
ndan
t chl
orite
and
ser
pent
ine,
alte
red,
da
rk-b
row
n bi
otite
, an
d ab
unda
nt n
eedl
es o
f ap
atite
; so
me
mag
netit
e an
d ilm
enite
. T
he t
hree
nor
th-tr
endi
ng
dike
s ar
e fr
om n
orth
to
sout
h, S
unde
rland
dik
e,
Lash
er-R
obin
son
dike
, and
Hut
son
dike
.
Engl
ehar
dt (
1973
); H
eyl
and
McK
eow
n (1
978)
; K
oeni
g (1
956)
; M
cDow
ell
and
othe
rs
(198
1);
Tra
ce (
1966
); W
elle
r an
d Su
tton
(195
1).
Koe
nig
(195
6).
Am
os (
1967
); E
ngle
hard
t (1
973)
; K
oeni
g (1
956)
; M
cDow
ell
and
othe
rs
(198
1);
Tra
ce a
nd A
mos
(1
984)
; Wel
ler a
nd
Sutto
n (1
951)
.
MIS
SOU
RI
Cra
wfo
rd C
ount
y:
CF
1 B
recc
iate
d se
dim
en
tary
roc
ks.
Cro
oked
Cre
ek
stru
ctur
e.Sy
nclin
al r
ing
grab
en w
ith d
efor
med
, el
liptic
al, u
plift
ed,
cent
ral a
rea.
Ex
tens
ive
brec
ciat
ion
of p
ost-P
reca
mbr
ian
rock
s in
bre
ccia
ted
zone
s, b
ut n
o ba
sic
or u
ltrab
asic
ig
neou
s ro
cks.
Sh
atte
r co
nes
com
mon
in c
entra
l ar
ea.
Loca
ted
at in
ters
ectio
n of
Cub
a fa
ult a
nd P
alm
er f
ault
zone
. Sn
yder
and
Ger
dem
ann
(196
5) i
nter
pret
ed s
truct
ure
as d
ia-
trem
e; H
endr
iks
(196
5) i
nter
pret
ed s
truct
ure
as a
stro
blem
e.
Hen
drik
s (1
965)
; O
ffie
ld
and
Pohn
(19
79);
Snyd
er
and
Ger
dem
ann
(196
5).
Tabl
e 1.
Sum
mar
y of
pet
rolo
gy,
stru
ctur
al i
nfor
mat
ion,
and
pri
mar
y re
fere
nces
on
alka
line
igne
ous
rock
s, c
arbo
natit
es,
and
peri
dotit
esin
the
nor
ther
n M
idco
ntin
ent
area
C
ontin
ued
Loca
lity
No.
Roc
k ty
peFe
atur
e or
st
ruct
ure
Des
crip
tion
Ref
eren
ces
MIS
SOU
RI
Con
tinue
dLa
cled
e Co
unty
;:
LC
1V
olca
nic
ash(
?)B
eds
Mag
netic
and
gr
avity
ano
mal
y.
New
Mad
rid
Cou
nty:
NM
1
Mic
aceo
usla
mpr
ophy
re.
New
Mad
rid a
nd D
unkl
ln C
ount
ies:
ND
1
Pem
isco
t C
ount
y:
PM 1
A
lkal
ine
igne
ous
rock
.
St.
Cla
ir Co
unty
;:
SC 1
Fa
ulte
d an
d br
ecci
ated
W
eaub
leau
cry
pto-
se
dim
enta
ry r
ocks
. ex
plos
ion
stru
ctur
e.
Vol
cani
c ro
cks
of H
azel
gree
n m
ay c
onsi
st o
f as
h an
d de
tritu
s in
terb
edde
d w
ith s
hatte
red
Upp
er a
nd M
iddl
e(?)
C
ambr
ian
Lam
otte
San
dsto
ne.
Kno
wle
dge
of o
ccur
renc
e ba
sed
on s
ingl
e dr
ill h
ole.
In
trusi
ve e
vent
thou
ght
to h
ave
occu
rred
dur
ing
Late
Cam
bria
n, c
onte
mpo
rane
ous
with
de
posi
tion
of t
he L
amot
te.
Igne
ous
rock
enc
ount
ered
in
drill
hol
e
Bur
ied
maf
ic o
r ul
tram
afic
int
rusi
on i
nfer
red
from
mag
netic
an
d gr
avity
sur
veys
.
Alk
alin
e ig
neou
s ro
ck p
enet
rate
d in
tw
o dr
ill h
oles
Zone
of
inte
nse
faul
ting
and
brec
ciat
ion
appr
oxim
atel
y 11
km
long
and
5 k
m w
ide.
Fa
ultin
g in
clud
es n
orm
al f
aults
bu
t is
chie
fly l
ow-a
ngle
thr
ust
faul
ts.
No
intru
sive
ig
neou
s ro
cks
know
n in
are
a.
Feat
ure
parti
ally
cov
ered
un
conf
orm
ably
by
undi
stur
bed
Penn
sylv
ania
n ro
cks.
Snyd
er a
nd G
erde
man
n (1
965)
.
Gro
hsko
pf (
1955
); H
eyl
and
McK
eow
n (1
978)
.
Hild
enbr
and
and
othe
rs
(197
7).
Bro
ck a
nd H
eyl
(196
1);
Hey
an
d M
cKeo
wn
(197
8).
Snyd
er a
nd o
ther
s (1
965)
; Sn
yder
and
Ger
dem
ann
(196
7).
St.
Fran
cois
and
Ste
. G
enev
ieve
Cou
ntie
s:
SF 1
Pe
ridot
ite
Avo
n di
atre
mes
SF 2
Pe
ridot
ite
Ste.
Gen
evie
ve C
ount
y:
SG 1
Pe
rido
tite
Out
crop
s(?)
Salin
e C
reek
dik
e
Stod
dard
and
NQW
Mad
rid C
ount
ies:
ST 1
-
Bloo
mfie
ld p
luto
n
Rey
nold
s C
ount
y:
RE 1
La
pilli
tuffs
, alte
red
volc
anic
mat
eria
l.D
iatre
mes
(?)
Intru
sive
mat
eria
l co
nsis
ts o
f pr
imar
y an
d se
cond
ary
calc
ite,
chie
fly s
econ
dary
qua
rtz,
pleo
chro
ic b
iotit
e, m
agne
tite,
po
tass
ium
fel
dspa
r, an
d pl
agio
clas
e.
Bio
tite
is co
mm
only
al
tere
d to
chl
orite
. A
cces
sory
min
eral
s in
clud
e ap
atite
an
d ga
rnet
. C
alci
te is
pse
udom
orph
ic a
fter
oliv
ine
and
pyro
xene
or a
mph
ibol
e.
Lapi
lli r
epor
ted.
B
iotit
e ag
es:
K-A
r 37
7+19
Ma,
Rb-
Sr 3
99±2
3 M
a (d
ated
mat
eria
l fro
m
S1/2
NW
1/4S
W1/
4 se
c. 1
8, T
. 35
N.,
R. 8
E).
Isol
ated
out
crop
s of
per
idot
ite
Kid
wel
l (1
947)
; Za
rtman
and
ot
hers
(19
67).
Hey
l an
d M
cKeo
wn
(197
8).
Kid
wel
l (19
47);
Zartm
an a
nd
othe
rs (
1967
).D
ark-
gree
nish
-gra
y pe
rido
tite
with
phe
nocr
ysts
of
alte
red
oliv
ine,
aug
ite,
and
biot
ite.
Incl
usio
ns o
f gr
anite
, qu
artz
ite, a
nd d
olom
ite u
sual
ly le
ss th
an 1
5 cm
in d
iam
eter
. C
hlor
ite i
s co
mm
on a
ltera
tion
prod
uct.
Acc
esso
ry m
iner
als
incl
ude
mag
netit
e, a
patit
e, a
nd g
arne
t. Se
cond
ary
quar
tz
pres
ent.
Dik
e is
1.5
m w
ide,
app
roxi
mat
ely
0.4
km lo
ng,
and
belie
ved
to b
e in
trude
d al
ong
east
-wes
t-tre
ndin
g fa
ult.
Bio
tite
ages
: K
-Ar 3
88±1
9 M
a,
Rb-
Sr 3
96±2
8 M
a.
Loca
ted
at S
E co
mer
sec
. 12
, T.
35 N
., R.
7 E
., in
bed
of
Salin
e C
reek
wes
t of
roa
d.
Loca
tion
show
n on
fig
ure
2.
Maf
ic o
r ul
tram
afic
int
rusi
on i
nter
pret
ed f
rom
mag
netic
and
H
ilden
bran
d an
d ot
hers
gr
avity
fie
lds.
(197
7).
Vol
cani
c ro
cks
at B
ee F
ork,
del
inea
ted
by 5
0 or
mor
e dr
ill
hole
s, c
onsi
st o
f la
pilli
tuf
fs, w
hich
gra
de l
ater
ally
into
be
dded
vol
cani
c as
h an
d vo
lcan
idas
tic f
acie
s in
Upp
er
Cam
bria
n B
onne
terr
e D
olom
ite.
Lapi
lli tu
ffs
cont
ain
alte
red
volc
anic
mat
eria
l with
rel
ict o
livin
e, p
hlog
opite
, an
d py
roxe
ne p
heno
crys
ts.
Evid
ence
for
fiv
e er
uptiv
e ce
nter
s in
vic
inity
of
Bee
For
k.
Max
imum
kno
wn
thic
knes
s of
vol
cani
c ro
cks
is 45
m.
Hey
l an
d M
cKeo
wn
(197
8);
Kis
vars
anyi
and
How
e (1
983a
, b,
c, d
, e);
Kis
vars
anyi
and
oth
ers
(198
1).
Tabl
e 1.
Sum
mar
y of
pet
rolo
gy,
stru
ctur
al i
nfor
mat
ion,
and
pri
mar
y re
fere
nces
on
alka
line
igne
ous
rock
s, c
arbo
natlt
es,
and
peri
dotit
esin
the
nor
ther
n M
idco
ntin
ent
area
C
onti
nued
Loca
lity
No.
Rock
type
Feat
ure
or
stru
ctur
eD
escr
iptio
nR
efer
ence
s
MIS
SOU
RI C
ontin
ued
Was
hing
ton
Cou
ntv:
WA
1
Tuff
aceo
us s
iltst
one
and
lapill
i tuf
fs,
carb
onat
ite.
Bed
ded
pyro
clas
tic
rock
s, di
atre
me(
?).
WA
2
Tuffi
site
Dia
trem
e(?)
Pyro
clas
tic r
ocks
at
Den
t B
ranc
h co
nsis
t of
phl
ogop
ite,
alte
red
oliv
ine
and
pyro
xene
, gar
net,
amph
ibol
e, il
men
ite,
mag
netit
e, a
nd p
erov
skite
. N
o m
elili
te n
oted
in g
roun
d-
mas
s. Cr
ysta
lline
cal
cite
of
poss
ible
car
bona
titic
orig
in
is pr
esen
t. Sm
all a
mou
nt o
f mill
erite
iden
tifie
d in
tuffs
. Py
rocl
astic
roc
ks c
rop
out
in d
itch
abou
t 10
0 m
wes
t of
inte
rsec
tion
of S
tate
Sup
plem
enta
ry H
ighw
ay C
and
Den
t B
ranc
h, (
sec.
3, T
. 35
N.,
R. 2
E.)
and
exte
nd f
or a
bout
0.
8 km
sou
th a
nd 2
.5 k
m n
orth
of
Hig
hway
C a
long
Den
t B
ranc
h.
Pyro
clas
tic m
ater
ial t
houg
ht to
hav
e be
en d
epos
ite
d in
sha
llow
-mar
ine
envi
ronm
ent a
nd r
ewor
ked
into
bed
de
d se
dim
enta
ry ro
cks.
Infe
rred
to b
e La
te C
ambr
ian
age.
Vol
cani
c ro
cks
at F
urna
ce C
reek
, di
scov
ered
in d
rill h
oles
, co
nsis
t of
lapi
lli o
f hi
ghly
alte
red
gree
n to
bla
ck b
asic
ig
neou
s ro
ck,
alon
g w
ith f
ragm
ents
of
gran
ite,
rhyo
lite,
sa
ndst
one,
and
san
dy d
olom
ite.
Lapi
lli c
onta
in c
hlor
ite,
carb
onat
e, p
hlog
opite
, m
agne
tite,
and
qua
rtz.
Dril
ling
indi
cate
s fu
nnel
-sha
ped
crat
er w
ith d
iam
eter
of
2.4
km in
U
pper
and
Mid
dle(
?) C
ambr
ian
Lam
otte
San
dsto
ne. U
pper
C
ambr
ian
Bon
nete
rre
Dol
omite
lies
und
istu
rbed
on
top
of
Hey
l and
McK
eow
n (1
978)
; K
isvar
sany
i an
d ot
hers
(1
981)
; Wag
ner a
nd
Kisv
arsa
nyi (
1969
).
Kisv
arsa
nyi
and
How
e,
(198
3a);
Snyd
er a
nd
Ger
dem
ann
(196
5);
Kisv
arsa
nyi
and
othe
rs
(198
1).
volc
anic
roc
ks, i
ndic
atin
g em
plac
emen
t dur
ing
Late
Cam
bria
n.
NEB
RA
SKA
John
son
and
Paw
nee
Cou
ntie
s:
JO 1
C
arbo
natit
ePl
ugC
arbo
natit
e ne
ar E
lk C
reek
dis
cove
red
by d
rillin
g ov
er p
osi
tive
grav
ity a
nd m
agne
tic a
nom
alie
s. Ty
pica
l Pen
nsyl
va-
nian
sed
imen
tary
roc
ks u
nder
lain
by
iron-
rich
carb
onat
ites,
w
hich
con
tain
dol
omite
, ank
erite
, hem
atite
, chl
orite
, phl
og
opite
, bar
ite,
and
quar
tz, w
ith le
sser
am
ount
s of
pyr
ite,
chal
copy
rite,
gal
ena,
and
ser
pent
ine.
G
eoph
ysic
al d
ata
indi
cate
a o
'lind
rical
mas
s w
ith r
adiu
s of
1.6
km
nea
r top
. A
vera
ge u
rani
um c
onte
nt o
f ca
rbon
atite
is 1
1.54
ppm
.
Har
lem
(19
82);
Trev
es
and
othe
rs (
1982
); B
rook
ins
and
othe
rs
(197
6).
Ric
hard
son
and
Nem
aha
Cou
ntie
s:
RN
1G
ravi
ty a
nd
mag
netic
ano
mal
y.N
orth
-sou
th-t
rend
ing
ellip
tical
gra
vity
ano
mal
y of
ar
ea a
nd 4
mill
igal
s re
lief.
Ver
tical
mag
neto
met
er s
urve
y re
veal
ed c
ircul
ar n
egat
ive
anom
aly
of a
bout
200
gam
mas
.
Saye
ed a
nd o
ther
s (1
972)
.
TE
NN
ESS
EE
Lake
Cou
ntv:
LA 1
A
lkal
ine
igne
ous
rock
.D
rill
hole
s pe
netr
atin
g al
kalin
e ig
neou
s ro
ckB
rock
and
Hey
l (1
961)
; H
ey
and
McK
eow
n (1
978)
.
WIS
CO
NSI
N
Mar
atho
n C
ount
y:
MA
1
Nep
helin
e sy
enite
, sy
enite
, fe
nite
, gr
anite
.
Pier
ce C
ount
y;
PI 1
Fa
ulte
d se
dim
enta
ry
rock
s, br
ecci
a pi
pe.
Com
posi
te
bath
olith
.
Rock
Elm
bre
ccia
pi
pe o
r cry
pto-
ex
plos
ion
stru
ctur
e.
Syen
ite c
ompl
ex a
t Wau
sau.
C
once
ntric
ally
zon
ed p
luto
ns
cons
istin
g of
(1)
out
er z
ones
of
feni
tized
vol
cani
c ro
cks,
(2)
disc
ontin
uous
zon
es o
f gn
eiss
ic n
ephe
line
syen
ite,
(3)
inne
r zo
nes
of s
yeni
te,
and
(4)
two
plut
ons
havi
ng
core
s of
gra
nite
tha
t in
vade
roc
ks o
f zo
nes
1-3.
A
bout
1,
500
mill
ion
year
s ol
d.
Gre
enbe
rg a
nd B
row
n (1
985)
; La
Ber
ge a
nd
Mye
rs (
1983
); Lo
ckw
ood
(196
7, 1
970)
.
Roc
k El
m s
truct
ure
is ne
arly
circ
ular
fea
ture
with
dia
met
er o
f C
ordu
a (1
985)
. ab
out 6
.5 k
m.
It ha
s rin
g bo
unda
ry fa
ult,
uplif
ted
cent
ral
area
, and
sed
imen
t-fill
ed r
ing
basi
n.
Cen
tral a
rea
has
appa
r
ently
bee
n in
trude
d by
bre
ccia
pip
e co
ntai
ning
qua
rtz, f
elsit
e po
rphy
ry,
and
pota
ssiu
m f
elds
par
with
min
or g
rani
te,
cher
t, an
d am
phib
olite
. N
o as
soci
ated
sho
ck m
etam
orph
ic f
eatu
res
foun
d.
Gol
d an
d di
amon
ds h
ave
been
fou
nd w
ithin
Roc
k El
m
stru
ctur
e, w
hich
is o
f M
iddl
e to
Ear
ly O
rdov
icia
n ag
e._
__
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_