Раннесилурийский возраст даек плагиогранита из Баженовского офиолитового комплекса, СРЕДНИЙ Урал (по данным Th-U-Pb-датирования монацита)

Юрий Викторович Ерохин; Вера Витальевна Хиллер; Кирилл Святославич Иванов

doi:10.17308/geology.2018.3/1557

Authors

Юрий Викторович Ерохин Institute of Geology and Geochemistry, RAS Ural Branch
Вера Витальевна Хиллер Institute of Geology and Geochemistry, RAS Ural Branch
Кирилл Святославич Иванов Institute of Geology and Geochemistry, RAS Ural Branch

DOI:

https://doi.org/10.17308/geology.2018.3/1557

Keywords:

chemical dating, monazite, plagiogranites, Bazhenovskiy ophiolite complex, Reftinskiy gab-bro-granite massif, Middle Urals

Abstract

The first data on the time of the intrusion of plagiogranite dikes in the ultrabasic rocks of the Bazhenovskiy ophiolite complex (Middle Urals) are obtained. Accessory monazite is found in the plagio-granites and its microprobe study of the chemical composition is performed. The age is determined by the chemical Th-U-Pb dating method. The monazite age is from 419 to 447 Ma, a weighted average of 429 ± 29 Ma and isochrone of 428 ± 33 Ma (MSWD = 0,48). The formation of plagiogranite dikes occurred in the early Silurian period and is associated with the formation of the Reftinskiy gabbro-granite massif.

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Author Biographies

Юрий Викторович Ерохин, Institute of Geology and Geochemistry, RAS Ural Branch

leading research worker, Candidate of Geologi¬cal and Mineralogical Sciences
Вера Витальевна Хиллер, Institute of Geology and Geochemistry, RAS Ural Branch

senior research worker, Candidate of Geological and Mineralogical Sciences
Кирилл Святославич Иванов, Institute of Geology and Geochemistry, RAS Ural Branch

Head of the Laboratory of Regional Geology and Geotectonics, Doctor of Geological and Mineralogical Sciences