DEPLETED SSZ TYPE MANTLE PERIDOTITES IN PROTEROZOIC EASTERN SAYAN OPHIOLITES IN SIBERIA
https://doi.org/10.5800/GT-2017-8-3-0298
Abstract
N.L. Dobretsov et al. [1985] first described the rock complexes in Eastern Sayan as ophiolites. Ophiolites formed in Dunzhugur island arc and were obducted onto Gargan block, a Neoarchean crystalline basement of the Tuva-Mongolian Massif (TMM), as a single nappe [Khain et al., 2002; Kuzmichev, 2004]. Zircons from plagiogranite were dated at 1021±5 Ma by multigrain TIMS and 1020±1 Ma by Pb-Pb single-grains evaporation method [Khain et al., 2002]. Later [Kuzmichev, Larionov, 2013] analysed 12 grains of detrital zircons from gravelstone of the Dunzhugur formation and obtained 206Pb/238U ages from 844±8 to 1048±12 Ma. Careful examination of these data shows that 206Pb/238U ages for concordant zircons only vary from 962±11 to 1048±12 Ma.
About the Authors
Kuo-Lung Wang
Institute of Earth Sciences, Academia Sinica;
National Taiwan University
Taiwan, Province of China
Taiwan, Province of China
Taipei;
Department of Geosciences, Taipei
Zhuyin Chu
Institute of Geology and Geophysics, Chinese Academy of Sciences
China
Beijing
China
Beijing
M. A. Gornova
A.P. Vinogradov Institute of Geochemistry, Siberian Branch of RAS
Russian Federation
Irkutsk
Russian Federation
Irkutsk
S. Dril
A.P. Vinogradov Institute of Geochemistry, Siberian Branch of RAS
Russian Federation
Irkutsk
Russian Federation
Irkutsk
V. A. Belyaev
Institute of Earth Sciences, Academia Sinica;
A.P. Vinogradov Institute of Geochemistry, Siberian Branch of RAS
Taiwan, Province of China
Taiwan, Province of China
Taipei;
Irkutsk
Kuan-Yu Lin
Institute of Earth Sciences, Academia Sinica;
National Taiwan University
Taiwan, Province of China
Taiwan, Province of China
Taipei;
Department of Geosciences, Taipei
S. Y. O’Reilly
Macquarie University
Australia
Australia
CCFS/GEMOC Key Centre, Department of Earth and Planetary Sciences,
Sydney
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Review
For citations:
Wang K., Chu Zh., Gornova M.A., Dril S., Belyaev V.A., Lin K., O’Reilly S.Y. DEPLETED SSZ TYPE MANTLE PERIDOTITES IN PROTEROZOIC EASTERN SAYAN OPHIOLITES IN SIBERIA. Geodynamics & Tectonophysics. 2017;8(3):583-587. https://doi.org/10.5800/GT-2017-8-3-0298
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