S-isotope investigations and geothermometric application of bismuthinites

Bente, K.

doi:10.1007/bf00206380

Cited by 4 publications

(1 citation statement)

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“…Area 4 ( fig. 2), at ~ 200~ and as~ ~ 10-Is atm., incorporating the bismuth/ bismuthinite sulphidation curve in the pyrite stability field, may represent the formation condi-tions of the later mineralization, although Bente (1982) gives a temperature of 135 ~ (+ 30~ for bismuthinite formation in the Bonser vein on the basis of S isotope fractionation data. The bismuth sulphoselenide, laitakarite, and bismuth sulphotelluride, joseite, may have formed under similar conditions.…”

Section: Copyrioht the Mineralooical Societymentioning

confidence: 99%

Mineralization in the Bonser vein, Coniston, English Lake District: mineral assemblages, paragenesis, and formation conditions

Stanley

Vaughan

1982

Mineral. mag.

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ABSTRACT. The Bonser vein, one of the most productive sources of copper in the English Lake District, contains a mineral assemblage comprising quartz, chlorite, calcite, dolomite, stilpnomelane, magnetite, pyrrhotine, pyrite, marcasite, native bismuth, bismuthinite, laltakarite, joseite, arsenopyrite, chalcopyrite, sphalerite, galena, and cosalite. The phases pyrrhotine, sphalerite, arsenopyrite, laitakarite, joseite, and cosalite were analysed by electron microprobe. The occurrence of laitakarite is the first reported in the British Isles. Textures of the ore and gangue minerals show that the vein minerals were deposited successively in open voids. The sequence of deposition was of quartz forming throughout, early chlorite and stilpnomelane with some dolomite and calcite, magnetite as the earliest opaque phase, followed by arsenopyrite, pyrrhotine, sphalerite, chalcopyrite, pyrite, and marcasite; the bismuth-and lead-bearing minerals were the last to form.The data on the coexisting phases and their compositions have been used to estimate the temperatures of mineralization and the activities of sulphur and oxygen. Magnetite and arsenopyrite appear to have formed at 350-400~ with as2 reaching 10 -12 to 10 -1* atm. and a02 around 10 -24 to 10 -29 atm. The assemblage of quartz, chlorite, stiipnomelane, calcite, dolomite, pyrrhoine, chalcopyrite, sphalerite, and (late) arsenopyrite was probably deposited at ~ 240 ~ with as~ decreasing to 10

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Section: Copyrioht the Mineralooical Societymentioning

confidence: 99%