TY - JOUR

T1 - Au (Ag)-se-te-s-cu-sb-as-bi mineralization at the maletoyvayam deposit (central kamchatka, russia) and physicochemical conditions of its formation

AU - Sidorov, Evgeny G.

AU - Borovikov, Andrey A.

AU - Tolstykh, Nadezhda D.

AU - Bukhanova, Daria S.

AU - Palyanova, Galina A.

AU - Chubarov, Valery M.

N1 - Publisher Copyright: © 2020 by the authors. Licensee MDPI, Basel, Switzerland.

PY - 2020/12

Y1 - 2020/12

N2 - Microthermometry study of fluid inclusions in quartz veins of the Maletoyvayam deposit (Central Kamchatka, Russia) was carried out. This epithermal gold deposit contains unique Au compounds including maletoyvayamite, which has not been reported anywhere else. Two paragenetic mineral associations (pyrite-quartz and maletoyvayamite-quartz) with quartz of different generations corresponding to different pulses were also described. Only early generations of quartz (Q1) include ore minerals: pyrite for the first mineral assemblage, and in Au-bearing minerals, sulfosalts, bismuthinite, and others—for the second assemblage. A study on fluid inclusions in quartz showed a salinity (mainly NaCl + KCl) range from 0.2 to 4.3 wt.% NaCl eq., increasing from the first mineral association to the second due to boiling fluids. The obtained temperature variations for quartz crystallization were 295–135 °C, the fluid pressure ranged from 79 to 4 bar. On the other hand, the range of conditions obtained for the gold productive ore association is more narrow: salinity of the fluid inclusions is 4.3 wt.% NaCl eq., the temperatures vary from 255 °C to 245 °C, and the pressure from 39 to 32 bar. These physicochemical characteristics of the Maletoyvayam ore deposit greatly coincide with other HS-type epithermal deposits; however, within the Central Kamchatka Volcanic Belt it is so far the only deposit of this type reported.

AB - Microthermometry study of fluid inclusions in quartz veins of the Maletoyvayam deposit (Central Kamchatka, Russia) was carried out. This epithermal gold deposit contains unique Au compounds including maletoyvayamite, which has not been reported anywhere else. Two paragenetic mineral associations (pyrite-quartz and maletoyvayamite-quartz) with quartz of different generations corresponding to different pulses were also described. Only early generations of quartz (Q1) include ore minerals: pyrite for the first mineral assemblage, and in Au-bearing minerals, sulfosalts, bismuthinite, and others—for the second assemblage. A study on fluid inclusions in quartz showed a salinity (mainly NaCl + KCl) range from 0.2 to 4.3 wt.% NaCl eq., increasing from the first mineral association to the second due to boiling fluids. The obtained temperature variations for quartz crystallization were 295–135 °C, the fluid pressure ranged from 79 to 4 bar. On the other hand, the range of conditions obtained for the gold productive ore association is more narrow: salinity of the fluid inclusions is 4.3 wt.% NaCl eq., the temperatures vary from 255 °C to 245 °C, and the pressure from 39 to 32 bar. These physicochemical characteristics of the Maletoyvayam ore deposit greatly coincide with other HS-type epithermal deposits; however, within the Central Kamchatka Volcanic Belt it is so far the only deposit of this type reported.

KW - Central Kamchatka Volcanic Belt

KW - Fluid inclusions

KW - Gold

KW - HS epithermal deposit

KW - Maletoyvayamite-quartz association

KW - SYSTEM

KW - TE MINERALIZATION

KW - LEPANTO

KW - fluid inclusions

KW - ENVIRONMENT

KW - FLUID INCLUSIONS

KW - gold

KW - SOUTH KAMCHATKA

KW - maletoyvayamite-quartz association

KW - PORPHYRY

KW - EPITHERMAL DEPOSIT

KW - GEOCHEMISTRY

KW - MINERALOGY

UR - http://www.scopus.com/inward/record.url?scp=85097419463&partnerID=8YFLogxK

U2 - 10.3390/min10121093

DO - 10.3390/min10121093

M3 - Article

AN - SCOPUS:85097419463

VL - 10

SP - 1

EP - 19

JO - Minerals

JF - Minerals

SN - 2075-163X

IS - 12

M1 - 1093

ER -