Molasse of the Belskii depression of the Cis-Uralian foredeep: Modern data about provenance

The crystallochemical characteristics of Cr-spinels and tourmalines in combination with U–Pb isotope data on detrital zircons from the Upper Permian and Lower Triassic sandstones of the Belskii Depression showed that the main provenances of the molasse sequence in the southern part of the Cis-Uralia...

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Bibliographic Details
Published in:Doklady earth sciences 2015-12, Vol.465 (2), p.1207-1210
Main Authors: Mizens, G. A., Maslov, A. V., Badida, L. V., Vovna, G. M., Kiselev, V. I., Ronkin, Yu. L., Hiller, V. V.
Format: Article
Language:English
Subjects:
Chemistry
Crystals
Earth and Environmental Science
Earth Sciences
Geology
Isotopes
Paleozoic
Permian
Precambrian
Spinel group
Triassic
Zirconium
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Summary:The crystallochemical characteristics of Cr-spinels and tourmalines in combination with U–Pb isotope data on detrital zircons from the Upper Permian and Lower Triassic sandstones of the Belskii Depression showed that the main provenances of the molasse sequence in the southern part of the Cis-Uralian foredeep were Lower Paleozoic (Sakmara zone) and Precambrian (Uraltau zone) complexes. The absence of Late Paleozoic zircons in the Tatarian (Upper Permian) sandstones, as well as their small amount in the Lower Triassic psammites together with geochemical and petrographic data, suggest that granite massifs of the Main Granitic Axis of the Urals, as Middle–Upper Paleozoic magmatic complexes of the Magnitogorsk Megazone, were not involved in erosion. At the same time, the significant amount of Precambrian zircons is indicative of the presence of metamorphic complexes in the provenance of the Uraltau zone.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X15120041