Granitoids of the Pozdnestanovoy Complex of the Dzhugdzhur–Stanovoy Superterrane, Central Asia Fold Belt: Age, Tectonic Setting, and Sources


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Аннотация

The geochemistry, geochronology, and isotope geochemical systematics (Nd, Sr, Hf, and Pb) of the granitoids of the Pozdnestanovoy complex of the Dzhugdzhur–Stanovoy superterrane of the Central Asia fold belt were investigated. It was shown that their age is Mesozoic (142–138 Ma) rather than Early Precambrian, as was previously supposed. The main sources of parental melts for these granitoids were the Neoarchean and Paleoproterozoic rocks of the lower continental crust of the Dzhugdzhur–Stanovoy superterrane and the rocks of the Late Paleozoic–Early Mesozoic continental crust of the Amur microplate. They were formed at depths of >40 km and temperatures of 700–800°C, most likely through the melting of mafic feldspar granulites under the conditions of aqueous fluid infiltration without any significant contribution from a juvenile heat source. The granitoids of the Pozdnestanovoy complex were emplaced during the closure of the eastern segment of the Mongolia–Okhotsk Ocean owing to the collision of the Siberian and Sino-Korean continents.

Авторлар туралы

A. Larin

Institute of Precambrian Geology and Geochronology

Хат алмасуға жауапты Автор.
Email: larin7250@mail.ru
Ресей, St. Petersburg, 199034

A. Kotov

Institute of Precambrian Geology and Geochronology

Email: larin7250@mail.ru
Ресей, St. Petersburg, 199034

E. Sal’nikova

Institute of Precambrian Geology and Geochronology

Email: larin7250@mail.ru
Ресей, St. Petersburg, 199034

V. Kovach

Institute of Precambrian Geology and Geochronology

Email: larin7250@mail.ru
Ресей, St. Petersburg, 199034

G. Ovchinnikova

Institute of Precambrian Geology and Geochronology

Email: larin7250@mail.ru
Ресей, St. Petersburg, 199034

V. Savatenkov

Institute of Precambrian Geology and Geochronology; Institute of Earth Sciences

Email: larin7250@mail.ru
Ресей, St. Petersburg, 199034; St. Petersburg, 199034

S. Velikoslavinskii

Institute of Precambrian Geology and Geochronology

Email: larin7250@mail.ru
Ресей, St. Petersburg, 199034

A. Sorokin

Institute of Geology and Nature Management, Far Eastern Branch

Email: larin7250@mail.ru
Ресей, Blagoveshchensk, 675000

I. Vasil’eva

Institute of Precambrian Geology and Geochronology

Email: larin7250@mail.ru
Ресей, St. Petersburg, 199034

N. Sergeeva

Institute of Precambrian Geology and Geochronology

Email: larin7250@mail.ru
Ресей, St. Petersburg, 199034

N. Mel’nikov

Institute of Precambrian Geology and Geochronology

Email: larin7250@mail.ru
Ресей, St. Petersburg, 199034

K.-L. Wang

Institute of Earth Sciences

Email: larin7250@mail.ru
Қытай республикасы, Taipei, 11529

S.-L. Chun

Department of Geosciences

Email: larin7250@mail.ru
Қытай республикасы, Taipei, 106

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