Abstract—
The Chernogorskoe gem-quality scapolite deposit, which is attributed to a new genetic type, is described. It is located in the Central Pamirs (Tajikistan), in the Sary-Dzhilga Formation of the Muzkol Group (PR1). Host rocks include metamorphosed mafic–ultramafic formations of the Kukurt complex, among which harzburgite was the first discovered. Albitite lenses host gem-quality scapolite mineralization. They were formed by the metasomatic replacement of nepheline syenite. This reaction was accompanied by a decrease in the volume of solid phases by 14% and the appearance of voids. Albitite bodies form a lenticular nesting structure, have crosscutting contacts, and make up amphibolite, which metasomatically replaces melanocratic gabbroid and partially altered harzburgite. Gem-quality scapolite is localized in 28 albitite lenses; the walls of their voids are encrusted with columnar purple scapolite. The sequence of processes at the studied deposit is as follows: formation of melanocratic gabbroids with small nepheline syenite bodies → metasomatic development of amphibolite after the former and albitite with voids after the latter → growth of columnar scapolite on voids walls → crystallization of gem-quality scapolite in voids.
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Litvinenko, A.K., Moiseeva, S.B., Odinaev, S.A. et al. Geology of the Chernogorskoe Gem-Quality Scapolite Deposit (Central Pamirs, Tajikistan). Geol. Ore Deposits 61, 481–493 (2019). https://doi.org/10.1134/S1075701519050040
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DOI: https://doi.org/10.1134/S1075701519050040