Mineralogical–Geochemical Features of Ice-Rafted Sediments in Some Arctic Regions
- Authors: Maslov A.V.1, Shevchenko V.P.2, Bobrov V.A.3, Belogub E.V.4, Ershova V.B.5, Vereshchagin O.S.5, Khvorov P.V.4
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Affiliations:
- Zavaritskii Institute of Geology and Geochemistry, Ural Branch
- Shirshov Institute of Oceanology
- Sobolev Institute of Geology and Mineralogy, Siberian Branch
- Institute of Mineralogy, Ural Branch, Russian Academy of Sciences
- Institute of Earth Sciences
- Issue: Vol 53, No 2 (2018)
- Pages: 110-129
- Section: Article
- URL: https://journals.rcsi.science/0024-4902/article/view/162639
- DOI: https://doi.org/10.1134/S0024490218020037
- ID: 162639
Cite item
Abstract
The quantitative mineral composition estimated using the Rietveld method and some geochemical features are considered for bulk samples of the ice-rafted sediments (IRS) from some Arctic regions. Layer silicates in the studied samples vary from ~20 to ~50%. They are dominated by micas and their decomposition products (illite and likely some part of smectites) at significant contents of kaolinite, chlorite, and transformation/decomposition products of the latter. A significant content of illite and muscovite among layer silicates in most IRS samples suggests that sources of the sedimentary material were mainly mineralogically similar to modern bottom sediments of the East Siberian and Chukchi seas, as well as presumably sediments of the eastern Laptev Sea. It is suggested that a significant kaolinite fraction in IRS samples from the North Pole area can be caused by the influx of ice-rafted fine-grained sedimentary material from the Beaufort or Chukchi seas, where kaolinite is supplied from the Bering Sea. Positions of IRS data points in the (La/Yb)N–Eu/Eu*, (La/Yb)N–(Eu/Sm)N, and (La/Yb)N–Th diagrams show that the studied samples contain variable proportions of erosion products of both mafic and felsic magmatic rocks and/or sufficiently mature sedimentary rocks. This conclusion is confirmed by localization of IRS data points in the Th/Co–La, Si/Al–Ce, and Si/Al–Sr diagrams.
About the authors
A. V. Maslov
Zavaritskii Institute of Geology and Geochemistry, Ural Branch
Author for correspondence.
Email: amas2004@mail.ru
Russian Federation, ul. Vonsovskogo 15, Yekaterinburg, 620016
V. P. Shevchenko
Shirshov Institute of Oceanology
Email: amas2004@mail.ru
Russian Federation, Nakhimovskii pr. 36, Moscow, 117997
V. A. Bobrov
Sobolev Institute of Geology and Mineralogy, Siberian Branch
Email: amas2004@mail.ru
Russian Federation, pr. akad. Koptyuga 3, Novosibirsk, 630090
E. V. Belogub
Institute of Mineralogy, Ural Branch, Russian Academy of Sciences
Email: amas2004@mail.ru
Russian Federation, Miass, Chelyabinsk obl., 456317
V. B. Ershova
Institute of Earth Sciences
Email: amas2004@mail.ru
Russian Federation, Universitetskaya nab. 7/9, St. Petersburg, 199034
O. S. Vereshchagin
Institute of Earth Sciences
Email: amas2004@mail.ru
Russian Federation, Universitetskaya nab. 7/9, St. Petersburg, 199034
P. V. Khvorov
Institute of Mineralogy, Ural Branch, Russian Academy of Sciences
Email: amas2004@mail.ru
Russian Federation, Miass, Chelyabinsk obl., 456317