Paleogene-Neogene sediments of Bel’kov Island (New Siberian Islands): Characteristics of sedimentary cover in the eastern Laptev shelf

This work is aimed at characterizing the 40-m-thick Paleogene-Neogene sedimentary sequence of Bel’kov Island, which was accumulated in the marginal part of a fluvial plain. On the basis of the plant megafossils and spore-pollen data, the studied sediments were formed in the Late Eocene-Early Miocene...

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Bibliographic Details
Published in:Stratigraphy and geological correlation 2013-07, Vol.21 (4), p.421-444
Main Authors: Kuzmichev, A. B., Aleksandrova, G. N., Herman, A. B., Danukalova, M. K., Simakova, A. N.
Format: Article
Language:English
Subjects:
Archaeology
Conglomerates
Detritus
Earth and Environmental Science
Earth Sciences
Eocene
Geophysics/Geodesy
Historical Geology
Islands
Miocene
Neogene
Oligocene
Paleogene
Pollen
Quaternary
Sedimentation & deposition
Sedimentology
Sediments
Stratigraphy
Structural Geology
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Summary:This work is aimed at characterizing the 40-m-thick Paleogene-Neogene sedimentary sequence of Bel’kov Island, which was accumulated in the marginal part of a fluvial plain. On the basis of the plant megafossils and spore-pollen data, the studied sediments were formed in the Late Eocene-Early Miocene with a probable sedimentation gap at the Eocene-Oligocene boundary. It was substantiated that the Paleogene-Neogene sediments were developed as a continuous cover over the entire area of Bel’kov Island. Later, they were eroded away from the island, but presumably preserved on the Bel’kov Horst and Zarya Strait. This suggests that the pre-Quaternary seismic complex, which continuously covers the Bel’kov Horst, also has Late Eocene-Early Miocene age. Selective dating of nonrounded detrital zircons from Lower Miocene conglomerates allowed us to substantiate the transportation of sediments from the Verkhoyansk-Kolyma Fold System along the Bel’kov-Svyatoi Nos Graben. The crystalline basement similar to the Ust’-Lena inlier was likely exposed on the East Laptev Horst and served as the source of metamorphic detritus, including zircons dated within 1850–2000 Ma.
ISSN:0869-5938
1555-6263
DOI:10.1134/S0869593813040059