A. E. Budyak, Yu. I. Tarasova, A. V. Chugaev, N. A. Goryachev, T. A. Velivetskaya, A. V. Ignatiev
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引用次数: 0
Abstract
Black shale sequences whose metamorphic grade exceeds the regional greenschist facies are considered by most researchers exclusively as promising for alluvial gold. The paper reports the results of a study of the Ykan deposit, located within the epidote–amphibolite facies zone, and its comparison with previously studied deposits localized in the greenschist-facies alteration zone. It was found that the the main factor of localization of the Ykan gold deposit is its lithological and stratigraphical restriction to the contact between carbonaceous phyllite shales and sandstones of the Aunakit Formation in the hanging wall of the anticline. The ore mineralization of the deposit is represented by a subsequent change of early dia-catagenetic pyrite (py-I, py-II) → metamorphogenic pyrrhotite (po, cpy, asp) → metamorphogenic-metasomatic pyrite–base metal (cpy, asp, py-III, gln, sph, pn, mrc) → postore pyrite (py-IV) assemblages. The ore stage is characterized by the highest possible PT parameters in the early ore metamorphic phase and their decrease at the ore-productive phase. Data on variations in the sulfur and lead isotopic composition indicate that they were transported into the ore fluid from the host metasedimentary sequences of the Aunakit Formation. Comparison of the obtained parameters of the Ykan deposit with the previously studied Sukhoi Log, Golets Vysochaishii, Ugakhan, and Krasnoe deposits confirmed that the Ykan deposit can be attributed to the Sukhoi Log-type deposits.
期刊介绍：
Russian Journal of Pacific Geology publishes the results of research on the Earth crust and mantle composition and provides articles on the geological structure and patterns of distribution of mineral deposits in the Pacific Ocean, marginal seas and continental margins. It discusses the topics of stratigraphy, sedimentology, magmatic activity, and seismicity. The journal deals with the problems of lithosphere plates tectonics, and offers the results of neotectonic, geomorphological, geodesic, environmental and mining studies in the Pacific region. The journal accepts theoretical, methodical and philosophical articles covering general issues of geology, geophysics, geochemistry, geoecology and mining. The journal also publishes critical notes and comments, and reviews.
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