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Characteristics and Mineralization Age of the Fukusen No. 1 Vein, Hishikari Epithermal Gold Deposits, Southern Kyushu, Japan
Author(s) -
Tohma Yuki,
Imai Akira,
Sanematsu Kenzo,
Yonezu Kotaro,
Takahashi Ryohei,
Koyama Masaaki,
Sekine Ryota,
Duncan Robert,
Watanabe Koichiro
Publication year - 2010
Publication title -
resource geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.597
H-Index - 43
eISSN - 1751-3928
pISSN - 1344-1698
DOI - 10.1111/j.1751-3928.2010.00140.x
Subject(s) - geology , chalcedony , geochemistry , vein , marcasite , hydrothermal circulation , pyrite , mineralization (soil science) , mineralogy , quartz , seismology , paleontology , calcite , medicine , sphalerite , soil science , soil water , psychiatry
The Fukusen No. 1 vein is located in the southeastern part of the Yamada deposit, Hishikari epithermal gold deposits, southern Kyushu, Japan. 40 Ar/ 39 Ar plateau ages of adularia from the margin and the center of the Fukusen vein are determined to be 0.617 ± 0.024 Ma and 0.606 ± 0.009 Ma, respectively. The Fukusen No. 1 vein shows banding structure composed mainly of quartz, adularia and clay minerals. Colloform texture is displayed by cryptocrystalline to amorphous silica material that is associated with fine‐grained electrum and sulfides near the center of the vein. Pyrite in the Fukusen No. 1 vein often shows acicular shape resulting from inversion from marcasite. Near the center of the vein, primary marcasite occurs associated with colloform texture of silica. The Fukusen No.1 vein preserves primary texture and materials which were deposited from the ore‐forming hydrothermal solution. The Fukusen No. 1 vein was formed in a short period and is one of the youngest veins in the Hishikari deposits.