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Флюидные включения и изотопия карбонатов Топольнинского золото-скарнового поля (горный Алтай)

Флюидные включения и изотопия карбонатов Топольнинского золото-скарнового поля (горный Алтай)

Abstract

В рудном поле выявлено пять продуктивных минеральных ассоциации: кварц-пирит-арсенопирит-кальцитовая, кварц-молибденит-кальцитовая; кварц-арсенопирит-пиритовая-кальцитовая, кварц-полиметаллическая-эпидот-амфибол-кальцитовая и теллуридно-сульфидная. Для определения условий минералообразования были изучены газово-жидкие включения в кальците и кварце из метасоматитов пропилитовой и березитовой формации, сопровождающие указанные минеральные ассоциации. Установлено, что в образовании минерализации принимало участие два флюидных потока отличающиеся по солености и металлогенической нагрузкой. Определено, что кальцитовые прожилки с молибденитом формировались при температурах 250–150 °C и солености 13…6 масс. % NaCl-экв. Кварц-арсенопирит-пирит-кальцитовая ассоциация образовалась при температурах 310–150 °C и солености 19…11 масс. % NaCl-экв. Формирование кварц-хлорит-полисульфидно-эпидот-амфибол-кальцитовой ассоциации происходило при температурах 190–150 °C. Метасоматиты разделяются на две фации: среднетемпературные эпидот-актинолитовые с соленостью 18…8 масс. % NaCl-экв. и низкотемпературные кальцит-хлоритовые с соленостью 10…5 масс. % NaCl-экв. Березиты образовались при температурах 240–187 °C и солености включений 9…4,5 масс. % NaCl-экв. Рассмотренные изотопные данные по углероду и кислороду в кальците указывают на разный источник вещества.

Five mineral associations are recognized in the ore field: quartz-pyrite-arsenopyrite-calcite, quartz-molybdenite-calcite; quartz-arsenopyrite-pyrite-calcite, quartz-polymetallic-epidot-amphibole-calcite and telluride-sulfide. Fluid inclusions in calcite and quartz from metasomatites of propylitic и beresitic formations, accompanying the specified mineral associations, were examined in order to determine the conditions of mineral precipitation. It was found out that two fluid brines, different from each other by salinity and metallogenic load, participated in mineralization. It is determined that calcitic veinlets with molybdenite were formed at 250–150 °C and salinity of 13….6 wt. % NaCl-equiv. Quartz-arsenopyrite-pyrite-calcite association was formed at 310–150 °C and salinity of 19…11 wt. % NaCl-equiv. Formation of quartz-chlorite-polymetallic-epidot-amphibole-calcite association formed at 190–150 °C. Metasomatites are divided into two facies: medium temperature epidot-actinolite with salinity of 18…8 wt. % NaCl-equiv. and low temperature calcite-chlorite with salinity of 9…4,5 wt. % NaCl-equiv. Beresites were formed at 240–187 °C and salinity of 9…4,5 wt. % NaCl-equiv. The examined isotopic data for carbon and oxygen in calcite point to various sources of elements.

Keywords

ЗОЛОТО-СКАРНОВАЯ ФОРМАЦИЯ, МИКРОТЕРМОМЕТРИЯ, ФЛЮИДНЫЕ ВКЛЮЧЕНИЯ, ИЗОТОПНЫЙ СОСТАВ, УГЛЕРОД, КИСЛОРОД

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
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gold