Тип публикации: статья из журнала
Год издания: 2022
Аннотация: Sulfide-poor platinum group element (PGE) ores of upper contact zone of the Norilsk-1 intrusion are studied including petrography, mineralogy and bulk chemical composition of samples from six drill cores and an open pit mine. The chromite-hosted inclusions are also examined in detail including heating- quenching experiments. A basiПоказать полностьюc genetic scenario for the formation of low-sulfide ores of the Norilsk-1 intrusion is proposed, in which massive crystallization of chromite was triggered by the contamination of a primitive magma with argillites of the Tunguska Formation, or, to a lesser extent, by mixing of this magma with more differentiated fluid-saturated one. The depletion of a silicate melt in Fe by mass chromite precipitation resulted in the enrichment of a coexisting sulfide liquid in Cu and Ni. The PGEs during the evolution of the system apparently accumulated in Cu-Ni sulfides, the content of which was higher in chromite-rich rocks. The post- magmatic decomposition of sulfide during intense metasomatism and autometasomatism led to an increase in the PGE tenor, resulting in the a sulfide-poor feature of the studied ores.
Журнал: Металлогения древних и современных океанов
Выпуск журнала: Т. 28
Номера страниц: 151-154
Место издания: Миасс
Издатель: Южно-Уральский федеральный научный центр минералогии и геоэкологии УрО РАН