USGS Open-File Report 2009-1191, plate 2 · DIAMICTITE-BEARING UNIT (middle and late...
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Transcript of USGS Open-File Report 2009-1191, plate 2 · DIAMICTITE-BEARING UNIT (middle and late...
Distribution of Grenville rocks were compiled from: Bauer and others, 2003; Dawson and others, 2003; Fitzsimons, 2000a; Gower and others, 1991; Hanson, 2003; Higgins and Leslie, 2000; Jacobs and others, 1998; Jacobs and Thomas, 1994; Kelling and others, 1985; Ramos and Aleman, 2000;Restrepo-Pace and others, 1997; Rickers and others, 2001; Trettin, 1991; Van Schmus and others, 1993; Yoshida and Vitanage, 1993).
LOCALITY NAMESAD, Adelaide geosyncline; AL, Alexander terrane; ALB, Albany-Fraser belts; AM, Amadeous basin; ANS, Arabian-Nubian Shield; AR, Arabian Peninsula; AU, Austroalpine of the eastern Alps; BA, Baltic Basin; BAV, Baikal-Vitim; CAM, Caman-Moquui Fault; CAN, Canadian Arctic; CAP, Cape of Good Hope; CAR, Carpathians; CAS, Caspian Sea; CC. Canadian Cordillera; CE, Central Asia mobile belt; CEI, Central India tectonic zone; COR, Cordillera de Merida; CU, Curnamona craton ; DA, Damara belt; EAG, Eastern Gnats Belt; EAO, East Asia Orogenic Belt; EAS, East Africa Orogenic Belt; GA, Gariep belt; GE, Georgina basin; HEL, Helvetic and Penninic basement in western Alps; HER, Herat Fault; HI, High Himalaya; IG, Igarka Uplift; KAL, Kalahari; KAN, Kangdian; KAO, Kaok belt; KH, Kharaulakh Mountains; KI, Kingan-Burega; KM, Klamath Mountains; KO, Kolyma; KOP, Kopet Dagh Fault; LA, Lambert Glacier-Prydz Bay; LH, Lesser Himalaya; LI, Lifilian; LU, Lazlow-Holm Bay; LUB, Lublin slope; MO, Mozambique belt; NA, Nanhua; NG, Ngalla basin; NI, Nixon Fork terrane; NAP, Northern Apppalachia; OSOI Officer-Savory basin; OL, Olenek uplift; OS, Ossa-Morena; OT, Otavi Platform; OTT, Ottawa graben; PAT, Paton highland; PE, Pechora; PRA, Pranhita-Godavari; QI, Qinling belt; QU, Qubangguuide fold belt; RA, Rajasthan; RU, Ruby terrane; SR, Salt Range; SAP, Saptura Mobile belts; SAX, Saxo-Thuringia; SEB, Serbomacedonian massif; SEW, Seward terrane; SNT, Son-Narmada-Tapti; SON, Son-Mahanadi; SOU, Southalpine in eastern Alps; TAM, Taminian belt; TAS, Tasman line; TAY, Taymyr; TE, Tepl·-Barrand; TO, Tocantins; TRE, Trans-European Suture Zone; TRM, Transantarctic Mountains; TU, Turakhansk uplift; UM, Ural Mountains; VA, Varanger Peninsula; WA, Wasatch line; WC, West Congo belt; Y, Yucatan; YE, Yenisey Ridge; YO,Yodoma-Maya; ZA, Zambezi
NEOPROTEROZOIC AULACOGEN OR INTRACONTINENTAL RIFT. Boxes on downtrown side.
OPEN-FILE REPORT 2009-1119PLATE 2 of 3
Pamphlet accompanies map
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5S
5N
10S
15S
20S
25S
10N
15N
30S
20N
25N
35S
30N
40S
35N
45S
40N
45N
50S
50N
55S
55N
60S
60N
65S
5E
65N
70S
70N
75S
75N
80S
80N
5W
85S
85N
95E
90E
70E
85E
45E
25E
60E
80E
30E
10E
15E
75E
55E
20E
35E
65E
50E
40E90W
70W
75W
60W
95W
65W
55W
40W
20W
30W
50W
10W
45W
80W
15W25
W
35W
85W
130E
120E 140E
115E125E
135E
145E110E
105E
180E
150E
160E175E170E
100E
155E165E150W
130W
105W
135W160W 155W
0W
125W165W
120W
145W140W 175W
110W
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115W
WORLD MAP SHOWING MAJOR NEOPROTEROZOIC CONTINENTS AND CONTINENTAL MARGINS, ASSOCIATED STRUCTURES, AND GRENVILLE- AGE (1,200 TO 900 MA) ROCKS CONSIDERED TO BE ALONG MESOPROTEROZOIC CONTINENTAL MARGINS, THE PRECURSORS OF NEOPROTEROZIC MARGINS
BYJ.H. STEWART
2009
Explanation
TAM
KAL
GA
CAP
OS
COR
Y
NAP
KMWA
CC
AL
OTT
CAN
NI
SEW
TONG
TAS
CUGEAM
AD
OF
ALB
KOA
DA
OT
ZALI
MO
WC
QU
ANS
EAS
AR
KOP
HERCAM
LH
SRRA
SAP
PRA
SNT
CEI
SON
EAG
HI
KAN
NA
QI
OL
KH
KI
YO
CE
BAV
PAT
YE
TUIG
TAY
CAR
HELAU
LUBTRE
SOUTE
SAX
UM
PE
BA
VAKO
CASSEB
TRM
LULA
EAO
DIAMICTITE-BEARING UNIT (middle and late Neoproterozoic, includes glaciogenic rocks of Sturtian (ca. 700 Ma);Marinoan (ca. 635 Ma); and Gaskiers (ca. 580 Ma) ages. Rock consists of a mixture of small to large clasts set in a mud andsand matrix (diamictite). Commonly associated with clastic and carbonate rock including fine-grained turbiditic rocks withlarge-sized clasts. Diamictite is generally considered to be glaciogenic. On map, the diamictite-bearing unit is shown withinareas of the carbonate and siliciclastic unit as well as in small areas outside of these map areas. In these small areas, thediamictite-bearing map unit includes both the carbonate and silicilastic unit and the diamictite-bearing unit
EVAPORITE-BEARING UNIT (middle and late Neoproterozoic, may include Cambrian rocks). Widespread surface and subsurface deposits in the Arabian Peninsula, Iran, and to a lesser extent in Pakistan and India. Consists mainly of evaporaterocks interstratified with dolomite, sandstone, shale, and local volcanic rocks
PAN-AFRICAN, BRASILIANO, AND RELATED ROCKS (middle and late Neoproterozoic, mostly considered to be 870 to550 Ma). Widspread rocks in Gondwana continents (Africa, South America, Madagascar, Arabian Peninsula, India, and SriLanka). Predominantly medium- to high-grade gneiss, metasediments, migmatites, and sparse granulites intruded byvoluminous granitoids. Mostly remobilized older Precambrian rocks. Small circle pattern indicates high-grade metamorphicrocks and granitoids and x's indicate relatively small post- or syn-metamorphic granitoids. Major belts of sedimentary rock,such as that of the Congo belt of west Africa, are not here grouped with the dominantly high-grade metamorphic rocks but withsedimentary rock of the carbonate and ciliciclastoc unit
RELATIVELY LARGE, GRANITOID BODIES ASSOCIATED WITH PAN-AFRICAN, BRASILIANO, AND RELATED ROCKS(middle and late Neoproterozoic)
CARBONATE AND SILICICLASTIC ROCKS (middle and late Neoproterozoic, includes some Cambrian rocks in Antarctica).Widely distributed. Fragmentary continental margin deposits circumscribing or lying near the boundaries of Laurentia, westAfrica, Baltica, Siberia, south China, India and adjacent Himalayas. Includes miogeoclinal shelf deposits on continentalmargins, as well as intracontinental deposits
MAFIC DIKE SWARMS (middle and late Neoproterozoic). Major dike swarms and associated intrusives; 723 Ma Franklin dikeswarm and intrusives in Canada; 827 Ma Gairdner dike swam in Australia; and lsesser dike swarms along the southern margin ofSiberia, in Norway, in the northwestern United States, and locally elsewhere
MAFIC AND ULTRAMAFIC ROCKS (middle and late Neoproterozoic). Large area of outcrops in central Asia and East AfricaOrogenic Belt and sparse elsewhere, mainly at continental margins
MAGMATIC ARC ROCKS (middle and late Neoproterozoic). Structurally complex assemblages of mafic to felsic, generallycalc-alkaline meta-igneous and meta-volcanoclastic rocks associated with interocean, back-arc, and continental margin settings.Commonly contains slivers of mafic or ultramafic rock
AREAS INFERRED TO BE UNDERLAIN BY CRATONS AND SHIELDS OF PRE-NEOPROTEROZOIC AGE
LINE ALONG TREND OF NEOPROTEROZOIC CONTINENTAL MARGIN THAT FOLLOWS TREND OFMESOPROTEROZOIC MARGIN
NEOPROTEROZOIC CONTINENTAL MARGIN. Dashed where inferred
MAJOR NEOPROTEROZOIC CONTINENTAL MARGIN DEPOSIT (Miogeocline). Arrows indicate extent and direction of thickening of the miogeocline. Neoproterozoic rocks in Scotland, Ireland, and Svalbard are considered to becontinental margin deposits, but facing direction of presumed miogeocline is uncertain
GRENVILLE-AGE (Mesoproterozoic) IGNEOUSAND METAMORPHIC ROCKS. Post-Grenville continentalmargins commonly follow trend of Grenville-age rocks
U.S. DEPARTMENT OF THE INTERIORU.S. GEOLOGICAL SURVEY
Manuscript approved for publication September 3, 2009
ANTARCTICA