Тип публикации: доклад, тезисы доклада, статья из сборника материалов конференций

Конференция: Всероссийский ежегодный семинар по экспериментальной минералогии, петрологии и геохимии; Москва; Москва

Год издания: 2018

Ключевые слова: Yenisei Ridge, gold ore deposits, pressure, temperature and chemistry parameters of ore formation, sources of ore substance

Аннотация: The gold-ore deposits of the Yenisei Ridge were formed during the period of Baikal folding at the anticlinorium limbs. The deposits form a single broadly NS gold ore belt about 300 km long. The ore shoot hosting commercial projects occupies the lower three kilometers of the stratified stratum with the total thickness of about 17 km. The thermodynamic conditions in the ore formation zone (T 450-510°С, P 3.6-4.4 kbar) testify to the epidote-amphibolite metamorphism facies. The ore generating hydrothermal solutions arrive from the granite formation zone to the deep fault zone with elevated permeability. The quartz-vein mineralization was formed at the temperatures of 100-400°C and pressures of 0.5-2.5 kbar, salinity of solutions of 0.8-49.0 wt. % NaCl eq., with constant content of CO₂ and variable CH₄ and N₂ content in the gas phase. Early sulfides-pyrrhotite and arsenopyrite-deposited at the temperatures of 207-610 and 300-550°С, and sulfur fugacity of -2.0…15.5 and -14.6…5.7, respectively. The formation of antimony parageneses occurred with a significant (about 150 Ma) gap at lower temperatures of 120-170°С. The final carbonate associations were formed at the temperatures of approximately 100-150°С. The distribution of rare and dispersed elements in ore minerals indicates the hybrid source of substance (a mixture of metamorphogenous crust and deep fluid).

Журнал: Труды Всероссийского ежегодного семинара по экспериментальной минералогии, петрологии и геохимии

Номера страниц: 232-235

Издатель: Федеральное государственное бюджетное учреждение науки Ордена Ленина и ордена Октябрьской революции Институт геохимии и аналитической химии им. В.И. Вернадского Российской академии наук

• Сильянов С.А. (Сибирский федеральный университет)
• Некрасова Н.А. (Сибирский федеральный университет)

• РИНЦ (eLIBRARY.RU)