Hydrothermal fluid parameters formed gold-massive-sulfide-polymetallic deposits of West-Magnitogorsk paleoisland arc, South Urals
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| RMS-DPI code: |
2008-1-78-0 |
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| Scientific session: |
Fluid regime of hydrothermal ore-forming systems |
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| Author listing: |
Zaykov V.V., Ankusheva N.N. |
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| Principal author: |
Ankusheva Natalya Nikolaevna |
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| Language: |
Russian |
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Abstract - Summary
(short description): | |
| Results of forming conditions of hydrothermal system of sulfide-polymetallic deposits of East-Magnitogorsk paleoisland arc determination are represented in the paper. Fluid inclusion study of quartz and calcite is first carried out in these objects. Hydrothermal systems include (i) under-ore veined and disseminated ores; (ii) sulfide ores with feeder channels filled with calcite and quartz; and (iii) quartz veins in over-ore dacites and rhyolites. Fluid inclusions in calcite from feeder channels and quartz from sulfide-quartz veins cutting quartz-plagioclase rhyolites and dacites were studied. Hydrothermal fluids formed the feeder channels of the Tash-Tau deposit have a NaCl–MgCl2-salt composition with salinity of 5–6.7 wt. % of NaCl-equiv. The temperatures of homogenization are 160–170 °Ñ. Hydrothermal veins in dacites consist of quartz, carbonates, and epidote. As a result of fluid inclusion study it was established that NaCl and MgCl2 with salinity of 4.5–8 wt. % prevails in hydrothermal fluids. The temperatures of homogenization are 230–280 °Ñ. In the Vishnyevka deposit fluid inclusions in quartz from sulfide-quartz veins in rhyolites and altered rocks were studied. NaCl with salinity of 2–8 wt. % prevails in hydrothermal fluids here. Minimal temperatures of mineral formation corresponding to homogenization temperatures are 120–180 °Ñ. Thus, it is established that fluid source in these objects is seawater. |
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| Date of presentation: |
24/09/2008 |
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| Presentation Place: |
IGEM RAS, Conference Hall |
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| RMS-DPI code: |
2008-1-78-0 |
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Proceeedings volume
in the RMS catalogue: | Proceedings of XIII International conference on thermobarogeochemistry and IVth APIFIS symposium. Volume 2. |
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| Pages: |
41-44 |
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File of proceedings
(PDF): |
103 K
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| Status: |
printed |
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| Recieved: |
13/03/2008 |
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| Accepted: |
28/06/2008 |
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| Published on-line: |
18/02/2009 |
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| Permanent address of publication: |
http://www.minsoc.ru/2008-1-78-0/ |
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| Contact author(s): |
Ankusheva, Natalia Nikolaevna |
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