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THE BASEMENT TECTONICS OF ERGUN MASSIF |
SUN Guang-rui, LI Yang-chun, ZHANG Yu |
Qiqihar Branch, Research Institute of Regional Geological Survey of Heilongjiang, Qiqihar 161005, China |
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Abstract Ergun massif is a typical representative of the Ergun-Mamyn-Jiagedaqi matching massifs.Its basement is composed of Mesoproterozoic greenstone and associated complex,with the tectonic characteristics of earlier crustal evolution.The greenstone belt is a typical volcanic-sedimentary formation formed by metabasic acid volcanic rocks and partly metasedimentary rocks.The bimodal volcanic rocks are mainly tholeiite,which transforms upward into calc-alkali volcanic rock series.The granitoids are of TTG rock series and adamellite-granite assemblage.The lithogeochemical features of all types of rocks in the granite greenstone massif are very much similar to those of the same types in the Archean granite-greenstone belts abroad and in North China platform.All the characteristics of the greenstone basin in the studied area suggest a likely forming environment of back arc rift type of volcanic-sedimentary basin in continental margin.
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Received: 14 March 2002
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[1] |
CHEN Hui-jun, CUI Tian-ri, QIAN Cheng, LI Lin-chuan, CHEN Jing-sheng, LI Wei, WU Xin-wei, JIANG Bin, SI Qiu-liang, QIN Tao, TANG Zhen, ZHANG Yu-jin, GUO Wei. ZIRCON U-Pb GEOCHRONOLOGY OF BASHENGHE PLUTON IN NORTHERN DAXINGANLING MOUNTAINS: Geological Implications[J]. GEOLOGY AND RESOURCES, 2019, 28(5): 405-412. |
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