NDLI: Composition and depositional environments of the Upper Jurassic-Lower Cretaceous Mar’yanovo formation (Southeastern West Siberian Sea Basin)

Content Provider	Springer Nature Link
Author	Zamirailova, A. G. Zanin, Yu. N. Yan, P. A.
Copyright Year	2011
Abstract	The study of the composition and depositional environments of sediments from the Mar’yanovo Formation (Upper Jurassic-Lower Cretaceous Bazhenov and Georgiev horizons) recovered by boreholes Vostok-1 and Vostok-3 in the southeastern part of the West Siberian Sea Basin revealed the following fact: in the latter hole located closer to the basin boundaries as compared with the former one, they are characterized by lower organic carbon and pyrite contents, indicating reduced salinity of the basin and higher oxidation degree of sediments. The same trend is derived from comparison of rocks from the Mar’yanovo Formation in both holes with the over- and underlying strata. In Borehole Vostok-4, the closet one to the former shoreline of the basin, the Mar’yanovo Formation is indistinguishable. Intense chemical weathering of rocks in provenances during their deposition noted by Kontorovich et al. (1971) is considered a most important factor responsible for its composition and formation conditions. Elevated influx of dissolved weathering products into the sea basin intensified its biogenic activity and stimulated the accumulation of high organic matter concentrations. This inference is valid for all Upper Jurassic-Lower Cretaceous organic carbon-rich sediments that are synchronous to the Mar’yanovo Formation and developed over a spacious area of the West Siberian basin.
Starting Page	41
Ending Page	59
Page Count	19
File Format	PDF
ISSN	00244902
Journal	Lithology and Mineral Resources
Volume Number	46
Issue Number	1
e-ISSN	16083229
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-01-16
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sedimentology Mineralogy Mineral Resources
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Economic Geology

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