The Gold Mineralization of the Baranyevskoe Au-Ag Epithermal Deposit in Central Kamchatka
The Baranyevskoe Au-Ag epithermal deposit of low-sulfidation (LS) type is located on the Kamchatka Peninsula in the Neogene-Quaternary Central Kamchatka Volcanic Belt, where Au-bearing quartz veins are usually accompanied by veinlet stockworks. Two economic associations are typical of the Baranyevsk...
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| Autores principales: | , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/7a7fd662ef9541ebbb0ea39c910dad1c |
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| Sumario: | The Baranyevskoe Au-Ag epithermal deposit of low-sulfidation (LS) type is located on the Kamchatka Peninsula in the Neogene-Quaternary Central Kamchatka Volcanic Belt, where Au-bearing quartz veins are usually accompanied by veinlet stockworks. Two economic associations are typical of the Baranyevskoe deposit. The first corresponds to gold-pyrite-quartz association with low-grade native gold (521–738‱) intergrown with pyrite. Some accessory Au-Ag minerals within the early association were also identified: acanthite AgS<sub>2</sub>, hessite AgTe<sub>2</sub>, lenaite Ag(Fe,Cu)S<sub>2</sub>, petzite Ag<sub>3</sub>AuTe<sub>2</sub>, utenbogardite Ag<sub>3</sub>AuS<sub>2</sub> and unnamed Ag-Sb-As sulfosalts. The former Au-Ag minerals were most likely formed in the temperature range of 320–330 °C based on the study of arsenopyrite thermometers and fluid inclusions. The second, a gold-sulfosalt-quartz association, includes high-grade native gold (883-941‱) in intergrowth with chalcopyrite. Cuprous phases (bornite, chalcocite, heerite, native copper, Cu-Zn solid solutions), Bi-rich sulfosalts (aikinite PbCuBiS<sub>3</sub>, emplectite CuBiS<sub>2</sub>, witticenite Cu<sub>3</sub>BiS<sub>3</sub>), stannoidite Cu<sub>8</sub>Fe<sub>3</sub>Sn<sub>2</sub>S<sub>12</sub>, mawsonite Cu<sub>6</sub>Fe<sub>2</sub>SnS<sub>8</sub>), Au-bearing galena, Te-free and Bi-rich tetrahedrite-tennantite represent this association. Fluid inclusions in gold-sulfosalt-quartz association are characterized by homogenization temperature ranging from 226 to 298 °C, and salinity from 0.4 to 1.2 wt. % NaCl eq. |
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