Characteristics and Mineralization Age of the Fukusen No. 1 Vein, Hishikari Epithermal Gold Deposits, Southern Kyushu, Japan

Tohma, Yuki; Imai, Atsushi; Sanematsu, Kenzo; Yonezu, Kotaro; Takahashi, Ryohei; Koyama, Masaaki; Sekine, Ryota; Robert, Duncan; Watanabe, Kenji

doi:10.1111/j.1751-3928.2010.00140.x

Cited by 17 publications

(20 citation statements)

References 27 publications

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“…Most LS ores formed in settings where earlier subduction enriched the lithospheric mantle above the subducted plate with volatiles and metals. The LS ores are generally similar in age to the nearby or host volcanic rocks (Hames et al, 2009;Izawa et al, 1990;Leavitt et al, 2004;Tohma et al, 2010). The LS ores are typically hosted by basalt-rhyolite calc-alkaline volcanic rocks in predominantly extensional environments in intra-arc, near-arc, and back-arc postcollisional rifts (Sillitoe and Hedenquist, 2003).…”

Section: Low-sulfidation Epithermal Depositsmentioning

confidence: 99%

“…Partial melting of this subduction-enriched mantle wedge produced magmas that yielded porphyry and epithermal mineralization (e.g., Richards, 2009;Saunders and Brueseke, 2012). New high-precision geochronology suggests that ore formation was of relatively short duration, perhaps as brief as a few thousand to a few tens of thousands of years (Heinrich, 2006;Saunders, 2010;Simmons and Brown, 2006;Tohma et al, 2010). The LS ores are generally similar in age to the nearby or host volcanic rocks (Hames et al, 2009;Izawa et al, 1990;Leavitt et al, 2004;Tohma et al, 2010).…”

Section: Low-sulfidation Epithermal Depositsmentioning

confidence: 99%

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Geochemistry of Hydrothermal Gold Deposits

Saunders

Hofstra²,

Goldfarb³

et al. 2014

Treatise on Geochemistry

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Section: Low-sulfidation Epithermal Depositsmentioning

confidence: 99%

Section: Low-sulfidation Epithermal Depositsmentioning

confidence: 99%

Geochemistry of Hydrothermal Gold Deposits

Saunders

Hofstra²,

Goldfarb³

et al. 2014

Treatise on Geochemistry

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“…ties responsible for major mineralizations at the Koryu deposit ceased by 0.85 Ma. The similar durations of mineralization from two other epithermal Au-Ag deposits were reported: 0.64 million years at the Hishikari deposit (Sekine et al, 2002;Sanematsu et al, 2005;Sanematsu et al, 2006;Tohma et al, 2010) and 0.53 million years at the Cibaliung deposit, Indonesia (Harijoko et al, 2004).…”

Section: Discussionmentioning

confidence: 50%

K-Ar ages of adularia at the Koryu epithermal Au-Ag deposit, Hokkaido in Japan

Shimizu

2011

Bull. Geol. Surv. Japan

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Four new K-Ar ages of adularia at the Koryu Au-Ag epithermal vein deposit along with the mineralization stages were determined. One age is 1.4 Ma for the first mineralization stage and the other three ages are 1.19-1.10 Ma for the most economically important Au-Ag mineralization stage. Combined with published data of K-Ar ages, mineral description, and fluid inclusion study, the results suggest that the hydrothermal activities waxed and waned, forming ore veins with ten mineralization stages for 0.55 million years in the Koryu deposit.

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“…A number of microthermometric studies on quartz and adularia were conducted, largely on samples from the Honko ore zone (e.g., Izawa et al, ; Nagayama, ; Hayashi et al, ), and a few studies each on samples from the Sanjin ore zone (Sanematsu et al, ; Takahashi et al, ) and the Yamada zone (Ueno et al, ; Tohma et al, ). These studies showed that: (i) the homogenization temperatures generally ranged between 150 and 250°C; (ii) the average values (and/or mode values) of homogenization temperatures were within the range 190–215°C, with some exceptions, suggesting that the formation temperature of the veins was generally around 200°C; and (iii) the formation temperatures between the columnar adularia (earliest stage) and the comb quartz (late stage) were similar.…”

Section: Discussionmentioning

confidence: 99%

“…a). The deposit formed during the Pleistocene (0.61–1.25 Ma) (Izawa et al, ; Sanematsu et al, ; Tohma et al, ) within basement sedimentary rocks of the Cretaceous Shimanto Supergroup and the overlying Quaternary volcanic rocks (Fig. b).…”

Section: Geological Setting Of the Metallic Mineralizationmentioning

confidence: 99%

Fluid Inclusion Studies of Comb Quartz and Stibnite at the Hishikari Au–Ag Epithermal Deposit, Japan

Shimizu

2018

Resource Geology

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Fluid inclusion microthermometry was conducted on late‐stage barren comb quartz and the latest stibnite at the Hishikari deposit to characterize the hydrothermal activity responsible for vein formation. Eight fluid inclusion assemblages (i.e. fluid inclusions trapped at the same time, ‘FIAs’) were studied to determine the formation fluid temperatures and salinities for the comb quartz in the Shosen No. 2 vein, Sanjin ore zone, and the stibnite in the Seisen No. 1–1 vein, Yamada ore zone. The average homogenization temperatures (the formation temperatures) of the seven FIAs from the comb quartz were between 207 and 230°C, while the average homogenization temperature (the formation temperature) of an FIA from the stibnite was 113°C. The measured fluid salinities of the seven FIAs from the comb quartz were low, ranging between 0.0 and 1.1 wt% NaCl equiv., indicating that dilute fluids were responsible for the comb quartz formation. By comparison with previous microthermometric data, the formation temperatures of the studied comb quartz were higher than those of columnar adularia and comb quartz at most other veins (generally around 200°C) but were similar to those of columnar adularia at Keisen veins (230°C) in the same ore zone. The higher formation temperatures both in the Shosen and the Keisen veins in the Sanjin ore zone indicate that the fractures corresponding to the vein system at the Sanjin ore zone were main conduits for hot ascending fluids. The low formation temperature of stibnite in the latest stage (113°C) indicates that stibnite precipitation occurred during a waning stage of hydrothermal activity. Combined with previous thermodynamic data on antimony solubilities, the large discrepancy between the formation temperature of the comb quartz (200–230°C) and that of the stibnite suggests that the stibnite may have precipitated as a result of a drastic cooling of the hydrothermal system.

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Characteristics and Mineralization Age of the Fukusen No. 1 Vein, Hishikari Epithermal Gold Deposits, Southern Kyushu, Japan

Abstract: The Fukusen No. 1 vein is located in the southeastern part of the Yamada deposit, Hishikari epithermal gold deposits, southern Kyushu, Japan.

Cited by 17 publications

References 27 publications

Geochemistry of Hydrothermal Gold Deposits

Geochemistry of Hydrothermal Gold Deposits

K-Ar ages of adularia at the Koryu epithermal Au-Ag deposit, Hokkaido in Japan

Fluid Inclusion Studies of Comb Quartz and Stibnite at the Hishikari Au–Ag Epithermal Deposit, Japan

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