epithermal gold mineralization and modern … · ii guidebook series of the society of economic...
TRANSCRIPT
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
ii
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.
iii
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
iv CONTENTS
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