Chemistry and Occurrences of Native Tellurium from Epithermal Gold Deposits in Japan

Nakata, Masao; Komuro, Kosei

doi:10.1111/j.1751-3928.2011.00159.x

Cited by 7 publications

(8 citation statements)

References 25 publications

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“…MI‐01452) from the Kawazu deposit was collected from the University Museum of the University of Tokyo. The native tellurium of these samples are already described by Nakata and Komuro (). Their structural, textural, and mineralogical features were examined under a binocular stereoscopic microscope, an ore microscope and a scanning electron microscope (SEM) with energy‐dispersive X‐ray spectroscopy (EDS) JEOL JSM‐5800LV with JED2200 with a beam voltage of 15 kV.…”

Section: Samplesmentioning

confidence: 99%

“…Distribution and locations of epithermal gold‐tellurium deposits in major Japanese Islands modified from Nakata and Komuro (). ★, deposit studied in this work; ●, deposit with gold tellurides reported in the previous works.…”

Section: Introductionmentioning

confidence: 99%

“…Photographs of polished sections from (a) Suzaki, (b) Kawazu, and (c) Teine under a binocular stereoscopic microscope fromNakata and Komuro (2011).…”

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(Au, Ag)Te₂Minerals from Epithermal Gold Deposits in Japan

Komuro

Nakata

2016

Resource Geology

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Chemical composition and mode of occurrences of (Au, Ag)Te2 minerals such as calaverite (AuTe2), sylvanite (AuAgTe4) and krennerite ((Au, Ag)Te2) in epithermal gold telluride ores from Suzaki, Kawazu and Teine are examined. In the ores from Suzaki, (Au, Ag)Te2 minerals occur in microbands of tellurides and fine quartz. The minerals in telluride bands change from krennerite, via calaverite‐native tellurium, to sylvanite, in the order of crystallization. A sample from Kawazu contains sylvanite and native tellurium with stutzite, hessite and tetradymite in the coarser gray quartz part. The Teine sample also contains sylvanite and native tellurium with barite and quartz. The peak patterns of XRD of calaverite, krennerite and sylvanite from Suzaki are almost identical to that of JCPDS 43–1472, JCPDS 8–20 and JCPDS 9–477, respectively. The Te, Au, Cu, and Ag contents of calaverite from Suzaki range from 56.4 to 57.9 wt.%, from 41.6 to 42.6 wt.%, from 0.28 to 0.45 wt.% and from 0.14 to 0.31 wt.%, respectively, corresponding to the formula Au0.97Ag0.01Cu0.02Te2. The Te, Au, Ag, and Cu contents of krennerite from Suzaki range from 59.6 to 61.4 wt.%, from 31.3 to 33.6 wt.%, from 4.91 to 6.13 wt.% and from 0.66 to 0.80 wt.%, respectively, corresponding to the formula Au0.71Ag0.22Cu0.05Te2 with Au and Ag ranging from 0.68 to 0.74 and from 0.20 to 0.25, respectively. The Te, Au, Ag, and Cu contents of sylvanite from Suzaki range from 61.5 to 63.4 wt.%, from 24.1 to 27.4 wt.%, from 10.0 to 12.5 wt.% and from 0.00 to 0.12 wt.%, respectively. The Te, Au, Ag, and Cu contents of sylvanite from Kawazu range from 62.7 to 63.3 wt.%, from 23.5 to 24.1 wt.%, from 12.0 to 12.5 wt.% and from 0.09 to 0.16 wt.%, respectively. The Te, Au, Ag, Cu and Fe contents of sylvanite from Teine range from 61.8 to 63.5 wt.%, from 23.6 to 24.7 wt.%, from 11.9 to 13.3 wt.%, from 0.01 to 1.65 wt.% and from 0.00 to 0.02 wt.%, respectively. The average formulae of sylvanite from Suzaki, Kawazu, and Teine are expressed as Au1.06Ag0.94Cu0.02Te4, Au1.00Ag0.95Cu0.02Te4 and Au1.01Ag0.95Cu0.06Te4, respectively. Judging from the mineral assemblages of these ores and other localities, Au–Te mineralization in the Japanese Islands can be divided into four types: native gold–calaverite at Date and Agawa, krennerite(−native tellurium) at Osore‐zan and Mutsu, sylvanite–native tellurium–hessite at Teine, Kawazu, Kobetsuzawa, and Kato, and polyminerallic assemblages at Suzaki and Kushikino. The pH–Eh diagram of aqueous tellurium species and tellurium minerals at 250°C indicates that (Au, Ag)Te2 minerals in epithermal gold telluride mineralization would have been formed under middle to low Eh and acidic (to intermediate) pH conditions. It is possible that dilute tellurium‐containing fluid would scavenge dilute gold.

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Section: Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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(Au, Ag)Te₂Minerals from Epithermal Gold Deposits in Japan

Komuro

Nakata

2016

Resource Geology

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“…Vein‐forming minerals are all fine grained except for those in late druses. Gold grains have high Ag contents (mostly 40–60 at %; Shikazono, ) and occur within “Ginguro” bands with minor base metal sulfides, such as sphalerite and galena (e.g., Hattori, ; Shikazono, ; Nakata & Komuro, ). Available fluid inclusion data show that fluids responsible for the auriferous quartz veins show a similar low salinity, <0.3 mol L −1 NaCl equiv., and filling temperatures (e.g., Miyazawa & Nozaki, ; Hattori, ; Shikazono, ).…”

Section: Mineralization In the Izu Peninsulamentioning

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Gold Mineralization in Izu Peninsula, Central Japan, during Crustal Extension in Response to Double Subduction

Hattori

Kano

2018

Resource Geology

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Izu Peninsula in central Japan, the northern tip of the Izu-Bonin arc, hosts numerous epithermal Au-Ag vein deposits of low-sulfidation style. All have similar vein textures, mineralogy, and alteration. Geochemical data from fluid inclusions in vein quartz, the mineralogy and mineral chemistry of alteration, and stable isotope data indicate that auriferous hydrothermal activity occurred under subaerial conditions. The K-Ar ages of auriferous vein minerals are <1.5 Ma, indicating that the mineralization took place after extensive submarine volcanism for the host rocks. These observations suggest that Au-Ag mineralization was synchronous with the development of an extensional regime of the Izu block after its collision with the Honshu arc after 1.5 Ma. This collision resulted in the shifting of the Izu block far from the trench to the rear position, and the subduction of the Izu block along the Suruga trough to the west and along the Sagami trough to the east. The reararc position of the Izu block and double subduction resulted in crustal extension, upwelling of asthenospheric mantle, and tholeiitic magmatism reflected by mafic dyke swarms and subsequent monogenetic volcanic activity in the Izu peninsula. The timing of the Au mineralization in the Izu Peninsula during the beginning of lithospheric extension is similar to that of the Sado Au-Ag deposit on Sado island in the Japan Sea. Two mineralization events coincide with extensive tholeiitic mafic volcanism and injections of dyke swarms related to the back-arc opening of the Japan Sea. The geological setting of the Au-Ag mineralization in Izu and Sado is also similar to that of the epithermal Au-Ag deposits in northern Nevada, where mineralization was contemporaneous with crustal extension and tholeiitic mafic magmatism derived from the asthenospheric mantle. This study suggests that epithermal Au mineralization at shallow crustal depths is a product of large-scale lithospheric evolution.

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“…Nakata and Komuro (2011) indicate that quartz, quartz-goldfieldite, quartz-stutzite-hessite-sylvanite-tetradymite, and quartzhessite-sylvanite-tellurantimony assemblages all contain native tellurium.…”

Section: Mineral Namementioning

confidence: 99%

Tellurium

Goldfarb¹,

Berger²,

George³

et al. 2017

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Division; available at http://periodic.lanl.gov/images/periodictable.pdf.Cover. Tellurium is a critical component for the development of efficient thin-film photovoltaic cells that are needed for the production of electricity from sunlight. A 2-megawatt, ground-mounted solar photovoltaic array occupies the site of a former landfill at Fort Carson, Colo. Photograph from the U.S. Department of Energy Western Area Power Administration. For an overview of USGS information products, including maps, imagery, and publications, visit https://store.usgs.gov/.

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Chemistry and Occurrences of Native Tellurium from Epithermal Gold Deposits in Japan

Cited by 7 publications

References 25 publications

(Au, Ag)Te₂Minerals from Epithermal Gold Deposits in Japan

(Au, Ag)Te₂Minerals from Epithermal Gold Deposits in Japan

Gold Mineralization in Izu Peninsula, Central Japan, during Crustal Extension in Response to Double Subduction

Tellurium

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Chemistry and Occurrences of Native Tellurium from Epithermal Gold Deposits in Japan

Cited by 7 publications

References 25 publications

(Au, Ag)Te2Minerals from Epithermal Gold Deposits in Japan

(Au, Ag)Te2Minerals from Epithermal Gold Deposits in Japan

Gold Mineralization in Izu Peninsula, Central Japan, during Crustal Extension in Response to Double Subduction

Tellurium

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(Au, Ag)Te₂Minerals from Epithermal Gold Deposits in Japan

(Au, Ag)Te₂Minerals from Epithermal Gold Deposits in Japan