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Siberian Traps: analyze of magmatism evolution as a way to discovery of new PGE-Cu-Ni depositsтезисы доклада
- Авторы: Krivolutskaya N.A., Latyshev A.V., Gongalsky B.I., Svirskaya N.M., Bychkova Ya V., Makarieva E.M., Makariev A.A., Vekshina T.I.
- Сборник: RFG2018
- Тезисы
- Год издания: 2018
- Место издания: Vancouver
- Аннотация: 1878 Association of world-class PGE-Cu-Ni Norilsk deposits with flood basalts within a unique Siberian trap province is a single example of combination of huge massive sulfides and effusive rocks. This situation poses a question on genetic relationships between lavas and ore-bearing intrusions . It was suggested that ore was formed inside close or open magmatic system. The last one regards the ore origin in horizontal part of channel during magmas flowing to the surface. Meanwhile, we do not see geological connections between intrusions and lavas. Their geochemical similarities (rare elements, isotope composition) are not a proof of their co-magmatic nature. Analyze of tectonic position for ore-bearing intrusions evidences their localization only inside paleorift zones despite the widespread distribution of similar gabbro-dolerite bodies around the Siberian province. Massifs with economic mineralization concentrated in Norilsk-Igarka rift , its branches (Dupkunsky , Bolsheavamsky) and along the Yenisey-Khantagsky Trough are characterized by elevated MgO content (10-12 wt%) and heavy sulfure isotopes in comparing intrusions from other parts of the province. Thus, the tectonic and magmatic factors are decisive in the formation of deposits. which were formed from magmas of elevated magenziality in long-lived zones where the accumulation of sulfides occurred in a post-penny fashion. Based on analyze magmatism evolution it is possible to predict a new deposit discovery in r. Kulyumber, Kurejka valleys and in the southern part of the Taimyr peninsula.
- Добавил в систему: Гонгальский Бронислав Иосифович