The Late Paleozoic porphyry-epithermal spectrum of the Birgilda-Tomino ore cluster in the South Urals, Russia
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- 作者：Olga Yu. Plotinskaya ; Anatoly I. Grabezhev ; Elena O. Groznova ; Reimar Seltmann ; Bernd Lehmann
- 关键词：Porphyry ; Epithermal ; Gold&ndash ; silver ; Copper ; Base-metal ; Urals ; Russia
- 刊名：Journal of Asian Earth Sciences
- 出版年：5 January, 2014
- 年：2014
- 卷：79
- 期：Complete
- 页码：910-931
- 全文大小：7259 K
文摘
The Birgilda-Tomino ore cluster in the East Uralian zone, South Urals, Russia, hosts a variety of Late Paleozoic porphyry copper deposits (Birgilda, Tomino, Kalinovskoe, etc.), high- and low sulfidation epithermal deposits (Bereznyakovskoe, Michurino), and skarn-related base metal mineralization (Biksizak) in carbonate rocks. The deposits are related to quartz diorite and andesite porphyry intrusions of the K-Na calc-alkaline series, associated to a subduction-related volcanic arc. We report microprobe analyses of ore minerals (tetrahedrite-tennantite, sphalerite, Bi tellurides and sulfosalts, Au and Ag tellurides), as well as fluid inclusion data and mineral geothermometry. On the basis of these data we propose that the Birgilda-Tomino ore cluster represents a porphyry-epithermal continuum, with a vertical extent of about 2-3 km, controlled by temperature decreases and fS2 and fTe2 increase from deeper to shallow levels.