Supergene sulphides and related minerals in the supergene profiles of VHMS deposits from the South Urals
Supergene sulphides and related minerals in the supergene profiles of VHMS deposits from the South Urals
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DOI：
10.1016/j.oregeorev.2006.03.008
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发表时间：
2008-06
影响因子：
3.3
通讯作者：
E. Belogub;K. Novoselov;V. Yakovleva;B. Spiro
中科院分区：
文献类型：
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作者：
E. Belogub;K. Novoselov;V. Yakovleva;B. Spiro
对俄罗斯南乌拉尔地区新近开采的塞浦路斯型、乌拉尔型和黑矿型火山岩型块状硫化物矿床表生剖面的矿物学和结构进行了研究。在Gayskoye、Zapadno-Ozernoye、Dzhusinskoye和Alexandrinskoye矿床的残留黄铁矿和石英黄铁矿砂中，已区分出次生硫化物和伴生矿物富集的特定分区。除了胶结亚带常见的矿物外，（铜蓝、辉铜矿和棘铜矿）、非化学计量的胶状和framboidal黄铁矿、黄铁矿-扎尔肯矿、磁黄铁矿样和约旦铁矿样矿物、变辰砂、闪锌矿、富硒黝铜矿和未鉴定的As-、Sb的Pb或Hg和Ag的硫盐、含硫的白铅矿、南乌拉尔地区VHMS矿床中的次生硫化物矿物具有轻硫同位素组成（−8.1至−17.2‰）的特征。叠加的高级氧化胶体黄铁矿，富集杂质（闪锌矿，方铅矿，和砷黝铜矿）从原生矿石，死水条件下，在氧化过程中的水位升高，和细菌活动导致表生浓度的基础金属硫化物，硒化物或硫盐。
The mineralogy and structure of the supergene profile in recently-exploited volcaniс hosted massive sulphide (VHMS) deposits of Cyprus, Uralian and Kuroko type in the South Urals, Russia, have been studied. Specific subzones enriched in secondary sulphides and associated minerals have been distinguished in residual pyrite and quartz–pyrite sands at the Gayskoye, Zapadno-Ozernoye, Dzhusinskoye and Alexandrinskoye deposits. Besides minerals which are common to the cementation subzones (covellite, chalcocite and acanthite), non-stoichiometric colloform and framboidal pyrite, pyrite–dzharkenite, pyrrhotite-like and jordanite-like minerals, metacinnabar, sphalerite, selenium-enriched tetrahedrite and unidentified As-, Sb sulphosalts of Pb or Hg and Ag, sulphur-bearing clausthalite, naumannite and tiemannite were also found. Secondary sulphide minerals in VHMS deposits of the South Urals region are characterized by light sulphur isotope compositions (−8.1 to −17.2‰). Superposition of the advanced oxidation of colloform pyrite, an enrichment in impurities (sphalerite, galena, and tennantite) from the primary ores, stagnant water conditions, an elevation of the water table during oxidation, and bacterial activity led to supergene concentrations of the base metals as sulphide, selenides or sulphosalts.