Инд. авторы:	Zhuravkova T.V., Palyanova G.A., Kalinin Y.A., Goryachev N.A., Zinina V.Y., Zhitova L.M.
Заглавие:	Physicochemical Conditions of Formation of Gold and Silver Parageneses at the Valunistoe Deposit (Chukchi Peninsula)
Библ. ссылка:	Zhuravkova T.V., Palyanova G.A., Kalinin Y.A., Goryachev N.A., Zinina V.Y., Zhitova L.M. Physicochemical Conditions of Formation of Gold and Silver Parageneses at the Valunistoe Deposit (Chukchi Peninsula) // Russian Geology and Geophysics. - 2019. - Vol.60. - Iss. 11. - P.1247-1256. - ISSN 1068-7971. - EISSN 1878-030X.
Внешние системы:	DOI: 10.15372/RGG2019118; SCOPUS: 2-s2.0-85074539307; WoS: 000494744500003;
Реферат:	eng: The mineral composition of ores from the Gornyi occurrence of the Valunistoe epithermal Au-Ag deposit (Chukchi Peninsula) has been studied. It has been found that, in addition to native gold, the Au-Ag mineralization comprises chalcogenides (uytenbogaardtite, petrovskaite, acanthite, naumannite, and cervelleite) and minerals of the pearceite-polybasite series, which occur as microinclusions in fine-grained pyrite. The physicochemical conditions of formation of productive mineral assemblages have been estimated based on the chemical composition of Au and Ag minerals and their relationships with other minerals. It is shown that ores were deposited from weakly acid solutions at the late stages, on the background of a temperature decrease from 350 to 100 degrees C, a decrease in the fugacities of sulfur (logf(S2), from -2 to -23), tellurium (logf(Te2), from -5 to -27), and selenium (logf(Se2), from -16.5 to -28), and changes in the redox conditions (logf(O2), from -23 to -48).
Ключевые слова:	physicochemical parameters of ore formation; Gornyi occurrence; Valunistoe deposit; Okhotsk-Chukchi volcanic belt; REGION; SELENIDES; TELLURIDES; Au-Ag chalcogenides; GENESIS; ORES; SULFIDES; SOLID-SOLUTIONS; THERMODYNAMIC PROPERTIES; AU-AG DEPOSIT; SPHALERITE; Au-Ag solid solutions;
Издано:	2019
Физ. характеристика:	с.1247-1256