Geochemistry and the Sm–Nd model age of sedimentary rocks from the lower horizon of the cover in the northeastern part of the West Siberian Platform
- Authors: Ivanov K.S.1, Ronkin Y.L.1, Erokhin Y.V.1, Pogromskaya O.E.1
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Affiliations:
- Zavaritsky Institute of Geology and Geochemistry, Ural Branch
- Issue: Vol 475, No 1 (2017)
- Pages: 788-792
- Section: Geochemistry
- URL: https://journals.rcsi.science/1028-334X/article/view/190286
- DOI: https://doi.org/10.1134/S1028334X17070133
- ID: 190286
Cite item
Abstract
The pre-Jurassic basement and lower (Jurassic) horizons of the sedimentary cover in Hole Borovaya 6 were studied. Analysis of rare and rare-earth elements shows that Jurassic sedimentary rocks were most likely formed at the expense of erosion and mixing of heterogeneous materials, namely acid sources of the Siberian Platform and Triassic riftogenic basaltoids. The variations of 147Sm/144Nd (0.1076–0.1250) and 143Nd/144Nd (0.512202–0.512437), as well as the Sm–Nd model ages of Jurassic sediments (1146–1362 Ma), provide certain evidence for participation of the Mesoproterozoic substrate in the formation of the rocks studied. The Sm–Nd model age of pre-Jurassic rocks (1281 Ma) is Mesoproterozoic as well. The Precambrian crystalline basement of the Siberian Platform is a likely source of these sedimentary rocks.
About the authors
K. S. Ivanov
Zavaritsky Institute of Geology and Geochemistry, Ural Branch
Author for correspondence.
Email: ivanovks55@ya.ru
Russian Federation, Yekaterinburg
Yu. L. Ronkin
Zavaritsky Institute of Geology and Geochemistry, Ural Branch
Email: ivanovks55@ya.ru
Russian Federation, Yekaterinburg
Yu. V. Erokhin
Zavaritsky Institute of Geology and Geochemistry, Ural Branch
Email: ivanovks55@ya.ru
Russian Federation, Yekaterinburg
O. E. Pogromskaya
Zavaritsky Institute of Geology and Geochemistry, Ural Branch
Email: ivanovks55@ya.ru
Russian Federation, Yekaterinburg