Journal
CHINA GEOLOGY
Volume 4, Issue 1, Pages 67-76Publisher
KEAI PUBLISHING LTD
DOI: 10.31035/cg2021023
Keywords
Early Cretaceous; Deformation; Biotite 40Ar-39Ar; Tashkorgan; Neo-tethyan; Pamir; Tibetan Plateau
Categories
Funding
- National Natural Science Foundation of China [91955203, 91755101, 41872121, 41302166]
- Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources [J1901-20-4]
- Scientific Research Fund of the Institute of Geology, Chinese Academy of Geological Sciences [S2003]
- Basic Research Project of Chinese Academy of Geological Sciences [JYYWF20180903, JYYWF20182103]
- project of China Geological Survey [DD20190006, DD20190060]
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The study investigates the southern Tashkorgan area in the northeastern Pamir Plateau, presenting new structural and age data. It concludes that the metamorphic rocks experienced an Early Cretaceous cooling event and suggests a connection to Andean-style orogenesis.
The Pamir Plateau comprises a series of crustal fragments that successively accreted to the Eurasian margin preceded the India-Asia collision, is an ideal place to study the Mesozoic tectonics. The authors investigate the southern Tashkorgan area, northeastern Pamir Plateau, where Mesozoic metamorphic and igneous rocks are exposed. New structural and biotite 40Ar-39Ar age data are presented. Two stages of intense deformation in the metamorphic rocks are identified, which are unconformably covered by the Early Cretaceous sediment. Two high-grade metamorphic rocks yielding 128.4 +/- 0.8 Ma and 144.5 +/- 0.9 Ma 40Ar-39Ar ages indicate that the samples experienced an Early Cretaceous cooling event. Combined with previous studies, it is proposed that the Early Cretaceous tectonic records in the southern Tashkorgan region are associated with Andean-style orogenesis. They are the results of the flat/low-angle subduction of the Neotethyan oceanic lithosphere. (C) 2021 China Geology Editorial Office.
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