Black Shale Geogenerations of the Verkhoyansk Terrigenous Complex and Their Productive Metal Content
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Abstract
In the Verkhoyansk fold–and–thrust belt, black shale geogenerations (formations) are widely developed in the Early and Early–Middle Carboniferous of the West Verkhoyanye area. They were first found in some sections in the interfluve of the upper Dyanyshka and upper Arkachan rivers, and were traced in Carboniferous deposits on the western limb of the Kygyltas anticline of the Kuranakh anticlinorium. The latest studies conducted on the eastern limb of the Kygyltas anticline (Khoboyotu–Eciy interfluve) permitted delineating in the river head of Khadarynya, 14–15 km north of the studied sections, at the base of the Carboniferous deposits the continental Late Visean Serdzhakh sandy formation (C1sd), which was earlier studied in the river basin of Dyanyshka. Correlation between Carboniferous rocks of the West Verkhoyanskand Orulgan–types sections revealed that in the North Verkhoyanye area, the stratigraphic analogue of the Serdzhakh Formation is the northern part of the Bylykat Formation (C1bl) containing abundant Early Carboniferous fern flora. In tracing geologic bodies along strike on the eastern limb of the Kygyltas anticline, the author established two black shale geogenerations of marine genesis belonging to the West Verkhoyansk–type section. They correspond to rhythmically–bedded terrigenous (sandly–clayey and clayey–sandly, respectively) formations of Carboniferous age: the Chochombal (C1-2čb) formation at the base conformably overlies the Serdzhakh formation, and is conformably overlain by the Imtandzha (C2im) formation. In these stratons of marine and littoral–marine geneses, which are spatially developed on the monoclinal eastern limb of the Kygyltas anticline, just as on its western limb, there were established new correlative levels of elevated concentration of Corg. and precious metals confined to the Lower and Lower–Middle Carboniferous transgressive cycles. The geogenerations of the eastern limb of the Kygyltas anticline are rich in syngenetic pyrite and superposed sulfidization of disseminated and veinlet–disseminated types with high gold content. The results obtained permit establishing, in the West Verkhoyanye area, a new for the Kuranakh anticlinorium the Khadarynya gold– (arsenic)–sulfide type of disseminated and veinlet–disseminated mineralization. The black shale geogenerations of marine and littoral–marine geneses distinguished on the eastern limb of the Kygyltas anticline are promising for the discovery of high-tonnage precious metal deposits.
About the Authors
Vitaliy Semenovich Grinenko
Diamond and Precious Metal Geology Institute, Siberian Branch, Russian Academy of Sciences (IGABM SB RAS)
Russian Federation
Russian Federation
Andrey Vladimirovich Prokopiev
Diamond and Precious Metal Geology Institute, Siberian Branch, Russian Academy of Sciences (IGABM SB RAS)
Russian Federation
Russian Federation
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For citations:
Grinenko V.S., Prokopiev A.V. Black Shale Geogenerations of the Verkhoyansk Terrigenous Complex and Their Productive Metal Content. Arctic and Subarctic Natural Resources. 2016;21(1):31-40. (In Russ.)
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ISSN 2686-9683 (Online)
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