EPITHERMAL GOLD MINERALIZATION AND MODERN … · ii GUIDEBOOK SERIES of the SOCIETY OF ECONOMIC...
Transcript of EPITHERMAL GOLD MINERALIZATION AND MODERN … · ii GUIDEBOOK SERIES of the SOCIETY OF ECONOMIC...
Guidebook Prepared for the Society of Economic Geologists Field Trip 28 October-3 November 2001
Series Editor: Tommy B. ThompsonSOCIETY OF ECONOMIC GEOLOGISTS
EPITHERMAL GOLD MINERALIZATION AND MODERN ANALOGUES, KYUSHU, JAPAN
Edited by Craig A. Feebrey, Toshihiko Hayashi, Sachihiro Taguchi
GUIDEBOOK SERIESVolume 34
Trip stops
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GUIDEBOOK SERIESof the
SOCIETY OF ECONOMIC GEOLOGISTS
SERIES EDITOR: Tommy B. Thompson
Graphic Design/Printing byJohnson Printing
1880 South 57th CourtBoulder, Colorado 80301
ISBN 1-887483-34-9
Additional copies of the guidebook maybe obtained from
Society of Economic Geologists, Inc.
7811 Shaffer Parkway
Littleton, CO 80127 USA
Telephone: (720) 981-7882
FAX: (720 981-7874
Website: <www.segweb.org> E-mail: [email protected]
Publication Date: October 2001
Cover figure: Map of Kyushu, Japan, with field trip stops indicated. Rectangles delimit the areas covered by route maps, p. viii–xi.
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ContentsPreface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vAcknowledgments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vItinerary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viRoute maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii
DAY 1Quaternary gold mineralization and it geologic environments in Kyushu, Japan (Reprint)
Eiji Izawa, and Yukitoshi Urashima . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Overview of epithermal gold mineralization in Kyushu, JapanEiji Izawa and Koichiro Watanabe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
DAY 2Route maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Hishikari gold mineralization: A case study of the Hosen no. 1 vein hosted by basement Shimanto sedimentary rocks, southern Kyushu, Japan
Eiji Izawa, Jiro Etho, Misuzu Honda, Yoshinobu Motomura, and Ryota Sekine . . . . . . . . . . . . . . . . . . . . . . 21
Geology and geophysical expression of the Yamagano low-sulfidation epithermal Au-Ag deposit, southwest Kyushu, Japan
Hiroyasu Murakami and Craig A. Feebrey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Field Stop: Geology and geophysical expression of the Yamagano low-sulfidation epithermal Au-Ag deposit, southwest Kyushu, Japan
Hiroyasu Murakami and Craig A. Feebrey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
DAY 3Route maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Kushikino gold mineralization in a Pliocene volcanic region, Kyushu, JapanEiji Izawa and Nanshi Zeng . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Epithermal gold exploration in the Iriki district, Kagoshima, JapanToshihko Hayashi and Sachihiro Taguchi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Field stop: Iriki kaolin mineToshihiko Hayashi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Field stops: Kushikino gold mineToshihiko Hayashi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
DAY 4Route maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Geology, geochemistry, and origin of high-sulfidation Cu-Au mineralization in the Nansatsu district, Japan (Reprint)
Jeffrey W. Hedenquist, Yukihiro Matsuhisa, Eiji Izawa, Noel C. White, Werner F. Giggenbach, and Masahiro Aoki . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Geology and gold exploration in the Nansatsu district, southern Kyushu, JapanToshihiko Hayashi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Field stops: Kasuga, Iwato, and Akeshi minesToshihiko Hayashi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
DAY 5Route maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Geology of Sakurajima volcano, southern Kyushu, JapanTetsuo Kobayashi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Field stops: SakurajimaTetsuo Kobayashi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
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DAY 6Route maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Overview of geological and geophysical features of Aso VolcanoKoichiro Watanabe and Sachihiro Taguchi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
Field stops: Aso VolcanoKoichiro Watanabe and Sachihiro Taguchi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
Kuju Iwo-yama fumaroleSachihiro Taguchi, Koichiro Watanabe, and Masahiro Komatsu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
Field stops: Kuju Iwo-yama fumaroleSachihiro Taguchi, Koichiro Watanabe, and Masahiro Komatsu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
DAY 7Route maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
Otake-Hatchobaru geothermal fieldSachihiro Taguchi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
Field stops: Otake-HatchobaruSachihiro Taguchi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179
Occurrence and structure of the Ikiryu sinter, Kuju volcanic region, north-central Kyushu, Japan
Tetsuya Nakanishi, Sachihiro Taguchi, Koichiro Watanabe, and Eiji Izawa. . . . . . . . . . . . . . . . . . . . . . . . 181
Onta pottery (Ontayaki) and Onta-Yamakuni gold fieldRyota Sekine, Koichiro Watanabe, Sachihiro Taguchi, and Eiji Izawa . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187