Global Geology 2018, 21(2) 77-90 DOI: 10.3969/j.issn.1673-9736.2018.02.01 ISSN: 1673-9736 CN: 22-1371/P | |||||||||||||||||||||||||||||||||||||||
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Geochemistry, petrogenesis and tectonic implication of Early Cretaceous A-type rhyolites in Hailar Basin, NE China | |||||||||||||||||||||||||||||||||||||||
ZHENG Han, SUN Xiaomeng | |||||||||||||||||||||||||||||||||||||||
College of Earth Sciences, Jilin University, Changchun 130061, China | |||||||||||||||||||||||||||||||||||||||
Abstract��
Early Cretaceous A-type rhyolites of the Shangkuli Formation in the Hailar Basin of NE China exhibit geochemical characteristics of high silicon,alkali,Fe/Mg,Ga/Al,Zr,Pb,HFSEs,and REE contents but low Ca,Ba,Sr and Eu,which meet the criteria of typical reduced A-type granite.The A-type rhyolites are most probably derived from magmatic underplating and partial melting of quartz-feldspathic lower crust,with the lithospheric mantle material involved,due to the extensional deformation of the Erguna-Hulun Fault.Although the A-type rhyolites show A1-type trace elements characteristics,they were formed in a post-orogenic extensional background together with the coeval widespread bimodal volcanic rocks,metamorphic core complexes,volcanic fault basins and metallogenic province in the Sino-Russia-Mongolia border tract.This extension event was related to the collapse of thickened region of the continental crust after the closure of the Mongol-Okhotsk Ocean. | |||||||||||||||||||||||||||||||||||||||
Keywords�� A-type rhyolites Hailar Basin Early Cretaceous petrogenesis lithospheric extension | |||||||||||||||||||||||||||||||||||||||
Received 2017-12-05 Revised 2018-01-12 Online: | |||||||||||||||||||||||||||||||||||||||
DOI: 10.3969/j.issn.1673-9736.2018.02.01 | |||||||||||||||||||||||||||||||||||||||
Fund:Supported by National Basic Research Program of China (No.2009CB219305). | |||||||||||||||||||||||||||||||||||||||
Corresponding Authors: SUN Xiaomeng | |||||||||||||||||||||||||||||||||||||||
Email: sunxiaomeng5210@163.com | |||||||||||||||||||||||||||||||||||||||
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