Petrogeochemical characteristics and U-Pb age of morion-granite rocks in Central Transbaikalia: Classification and genesis problems
https://doi.org/10.24930/1681-9004-2020-20-5-690-705
Abstract
Research subject. This article presents data on the age, material composition, petrogenetical and geochemical properties of morion-containing granites in the Etytei and Khamnigadai massifs of Central Transbaikalia.
Materials and methods. The composition of rock samples was investigated using the methods of chemical analysis, XRD and ICP-MS; the age was determined by the zircon U–Pb method using SHRIMP and LA-ICP-MS; the mineral composition was studied using an LEO-1430 electron microscope.
Results. The massifs composed of morion-containing granites belong to Early Jurassic (190–185 Ma) and form the peripheral area of the Early Mesozoic Khentei-Dauria magmatic region.
Conclusion. According to their petrochemical and mineralogical characteristics, the morion-containing granites under study differ from typical intra-plate granitoids and correspond to the “oxidized” A-type granites. The black smoky colour of quartz contained in granite samples is associated with a relatively high radioactivity of rocks caused by the presence of accessory thorium and uranium-containing minerals.
Supporting agencies: The studies were supported by the Presidium of the Russian Academy of Sciences No. 1.4P program and RFBR grants No. 17-05-00275, 19-05-00312
About the Authors
A. L. Elbaev
Geological Institute SB RAS
Russian Federation
Russian Federation
Aleksei L. Elbaev
6a Sakh’yanova st., 670047 Ulan-Ude
I. V. Gordienko
Geological Institute SB RAS
Russian Federation
Russian Federation
Ivan V. Gordienko
6a Sakh’yanova st., 670047 Ulan-Ude
V. B. Khubanov
Geological Institute SB RAS
Russian Federation
Russian Federation
Valentin B. Khubanov
6a Sakh’yanova st., 670047 Ulan-Ude
O. V. Zarubina
A.P. Vinogradov Institute of Geochemistry SB RAS
Russian Federation
Russian Federation
Ol’ga V. Zarubina
1a Favorsky st., 664033 Irkutsk
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Review
For citations:
Elbaev A.L., Gordienko I.V., Khubanov V.B., Zarubina O.V. Petrogeochemical characteristics and U-Pb age of morion-granite rocks in Central Transbaikalia: Classification and genesis problems. LITHOSPHERE (Russia). 2020;20(5):690-705. (In Russ.) https://doi.org/10.24930/1681-9004-2020-20-5-690-705
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