Cuprobismutite group minerals (cuprobismutite, hodrušhite, kupčíkite and padĕraite), other Bi–sulfosalts and Bi–tellurides from the Obari mine, Yamagata Prefecture, Japan

Izumino, Yuya; Nakashima, Keisuke; Nagashima, Mariko

doi:10.2465/jmps.140129

Cited by 8 publications

(4 citation statements)

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“…五十公野裕也・中島和夫のCuを含む。同様な化学組成を示すコサラ鉱は大張鉱山 (Izumino et al, 2014) 4a)。本鉱山産のものと類似した化学組成を示すリリアン鉱は，揚ノ沢鉱山 (Nedachi et al, 1973)や神岡鉱山 (Mariko et al, 1996 (Sugaki et al, 1980)などから報告されている。アイキン鉱 輝蒼鉛鉱系鉱物は，黄銅鉱と共生することが鳳翩山地域の鉱床群 (Nakashima et al, 1981)などから報告され (Nakashima et al, 1981)や揚ノ沢鉱山 (Nedachi et al, 1973) (Mariko et al, 1996)や鳳翩山地域の鉱床群 (Nakashima et al, 1981)…”

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Bi minerals from the ore deposits associated with the Wasada granodiorite, Yamagata Prefecture, Japan

Izumino¹,

Nakashima²

2014

Japanese Magazine of Mineralogical and Petrological Sciences

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Bi minerals from the ore deposits associated with the Wasada granodiorite, Yamagata Prefecture, Japan 五十公野裕也(Yuya IZUMINO) 中島和夫(Kazuo NAKASHIMA)  Many Bi bearing ore deposits are distributed in and around the Wasada granodiorite, located in the Tsuruoka district, Yamagata Prefecture, Japan. We examined Bi minerals from the Kuromori, Hongo, Obari, Yakuwa, Honko, Asashi and Obiro mines. Most of the Bi minerals are sulˆdes and sulfosalts, and the occurrence of native Bi is very rare. Cu Bi S minerals such as wittichenite occur and are closely associated with bornite and tetrahedrite tennantite in the Cu Bi mineralization of the Kuromori, Hongo Obari, Yakuwa and Obiro mines. The Aikinite bismuthinite series occurs within chalcopyrite in the Obari, Honko and Obiro mines. Pb Bi S minerals such as cosalite occur and are intergrown with galena in the Cu Bi Pb Zn mineralization of the Obari, Asashi and Obiro mines. Therefore, the formations of Bi mineral phases were aŠected by coexisting major Cu and/or Pb minerals. A mineral assemblage of coexisting iron sulˆdes indicates a lack of native Bi in this region, attributed to higher f S2 in the studied deposits than other Bi deposits in the Inner Zone of SW Japan.

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Bi minerals from the ore deposits associated with the Wasada granodiorite, Yamagata Prefecture, Japan

Izumino¹,

Nakashima²

2014

Japanese Magazine of Mineralogical and Petrological Sciences

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“…In this study, the sulfidation state shows a decreasing trend from prograde to the retrograde stage as indicated by the evolution of mineral assemblages (e.g., from pyrite-chalcopyrite in prograde into pyrrhotite-pyrite-arsenopyrite in the retrograde stage). In addition, Bi can occur in various oxidation states from Bi 0 (native Bi) to Bi 3+ in the form of bismuthinite and Bi-sulfosalts [25,30]. In this study, since the native Bi typically occurs as blebs overgrown by other sulfides or Bi-sulfosalts (e.g., galena, cossalite), we suggest that native Bi formed earlier than other Bi-sulfosalts.…”

Section: Discussionmentioning

confidence: 59%

Bi-Ag-Sulfosalts and Sulfoarsenides in the Ruwai Zn-Pb-Ag Skarn Deposit, Central Borneo, Indonesia

et al. 2022

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The Ruwai skarn deposit is located in the Schwaner Mountain complex within the central Borneo gold belt and is currently considered the largest Zn skarn deposit in Indonesia. The deposit has been known to host Zn-Pb-Ag mineralization in the form of massive sulfide ore bodies; however, the occurrence of Ag-bearing minerals has not been identified yet. This study documents the mineralogical characteristics of several Bi-Ag sulfosalts and sulfoarsenides, as well as their chemical compositions. Ten Bi-Ag sulfosalts were identified, including native bismuth, tetrahedrite, cossalite, tsumoite, bismuthinite, joseite-B, Bi6Te2S, Bi-Pb-Te-S, Bi-Ag-S, and Bi-Te-Ag. Three sulfoarsenides were identified, including arsenopyrite, glaucodot, and alloclasite. The occurrence of Bi-Ag sulfosalts is typically associated with massive sulfide mineralization, although tsumoite can also be found associated with massive magnetite. In terms of sulfoarsenides, both arsenopyrite and glaucodot are associated with massive sulfide mineralization, whereas alloclasite is associated with massive magnetite mineralization. The Bi-bearing minerals are characterized by irregular, bleb-like texture or patch morphology, and occur either as free grains or inclusions within sulfides, such as galena or pyrite. Tetrahedrite typically has an anhedral shape with a rim or atoll texture surrounding sphalerite or galena. In contrast, sulfoarsenides are typically found as euhedral–subhedral grains where glaucodot typically is rimmed by arsenopyrite. Both Bi-Ag sulfosalt and sulfoarsenides were formed during the retrograde stage under high oxidation and a low sulfidation state condition. The ore-forming temperature based on arsenopyrite geothermometry ranges from 428 °C to 493 °C.

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“…Although few studies have mentioned the formation environments of Cu-Bi sulfosalts and associated paděraite, we note their occurrence is generally in deposits characterized by relatively high temperatures, including metamorphosed W deposits [8], granite-related Cu-rich veinlets, and Li-Be-bearing granitic pegmatite at Swartberg ( [10] and references therein). Furthermore, based on fluid inclusion data (310-390 • C) for quartz from the Obari mine, Japan, formation of cuprobismutite-group minerals took place above 300 • C [13].…”

Section: A New Skarn Occurrence Of Kupčíkite and Paděraite The First ...mentioning

confidence: 99%

“…Paděraite, Cu 6 AgPb-Bi 12 S 22 , is a closely related phase [7]. These minerals are reported from only a limited number of occurrences in mineralized veins and skarns, e.g., from the Felbertal metamorphogenic scheelite deposit, Austria [5,8]; the Băiţa Bihor Cu and Ocna de Fier Fe-Cu skarns, Romania [6,9]; the Swartberg rare metal pegmatite, South Africa [10]; and in Slovakia [11], Poland [12], and the high-grade Obari Au-Cu-Bi deposit, Japan [13]. Makovicky [14] postulated the general formula for these minerals as Cu 4 Me 2(N-1)+1 Bi 4 S 2N+8 , where Me is Bi and Ag, and N is the order number for each homologue type.…”

Section: Introductionmentioning

confidence: 99%

Constraints on Ore Genesis from Trace Ore Mineralogy: A New Occurrence of Kupčíkite and Paděraite from the Zhibula Cu Skarn Deposit, Southern Tibet

Xu,

Ciobanu,

Cook

et al. 2024

Minerals

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Mineral assemblages containing Cu-Bi sulfosalts, Bi chalcogenides, and Ag-(Au) tellurides have been identified in the mid-Miocene Zhibula Cu skarn deposit, Gangdese Belt, southern Tibet. Different mineral assemblages from three locations in the deposit, including proximal massive garnet skarn, proximal retrogressed pyroxene-dominant skarn in contact with marble, and distal banded garnet–pyroxene skarn hosted in marble, are studied to constrain the evolution of the mineralization. Hypogene bornite contains elevated Bi (mean 6.73 wt.%) and co-exists in proximal andradite skarn with a second bornite with far lower Bi content, carrollite, Au-Ag tellurides (hessite, petzite), and wittichenite. This assemblage indicates formation at relatively high temperatures (>400 °C) and high fS2 and fTe2 during prograde-stage mineralization. Assemblages of Bi sulfosalts (wittichenite, aikinite, kupčíkite, and paděraite) and bismuth chalcogenides (e.g., tetradymite) in proximal pyroxene skarn are also indicative of formation at relatively high temperatures, but at relatively lower fTe2 and fS2 conditions. Within the reduced distal skarn (chalcopyrite–pyrrhotite-bearing) in marble, cobalt, and nickel occur as discrete minerals: cobaltite, melonite and cobaltic pentlandite. The trace ore mineral signature of the Zhibula skarn and the distributions of precious and critical trace elements such as Ag, Au, Co, Te, Se, and Bi support an evolving magmatic–hydrothermal system in which different parts of the deposit each define ore formation at distinct local physicochemical conditions. This is the first report of kupčíkite and paděraite from a Chinese location. Their compositions are comparable to other occurrences, but conspicuously, they do not form nanoscale intergrowths with one another.

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Cuprobismutite group minerals (cuprobismutite, hodrušhite, kupčíkite and padĕraite), other Bi–sulfosalts and Bi–tellurides from the Obari mine, Yamagata Prefecture, Japan

Cited by 8 publications

References 28 publications

Bi minerals from the ore deposits associated with the Wasada granodiorite, Yamagata Prefecture, Japan

Bi minerals from the ore deposits associated with the Wasada granodiorite, Yamagata Prefecture, Japan

Bi-Ag-Sulfosalts and Sulfoarsenides in the Ruwai Zn-Pb-Ag Skarn Deposit, Central Borneo, Indonesia

Constraints on Ore Genesis from Trace Ore Mineralogy: A New Occurrence of Kupčíkite and Paděraite from the Zhibula Cu Skarn Deposit, Southern Tibet

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