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《Earth Science》 2017-12
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Petrogenesis and Tectonic Settings of Volcanic Rocks from Late Triassic Hadataolegai Fm.at Central Part of Great Xing'an Range

Ma Yongfei;Liu Yongjiang;Wen Quanbo;Zhang Zhibin;Li Wei;Si Qiuliang;Tang Zhen;College of Earth Sciences,Jilin University;Shenyang Institute of Geology and Mineral Resources;  
To realize the tectonic setting at central part of Great Xing'an Range during Late Triassic,petrology,zircon U-Pb chronology and geochemical of the Late Triassic Hadataolegai Fm.were analyzed in this paper.The volcanic rocks from Late Triassic Hadataolegai Fm.can be divided into three rock series which are intermediate latite and andesite,intermediate to acidic quartz trachyandensite and acid rhyolite,and their formation ages are 210.9±3.5 Ma,216.6±3.1 Ma,216.9±2.1 Ma and230.2±2.2 Ma,respectively.The magma of intermediate series was derived from partial melting of lithospheric mantle which fully enriched by fluids released from subduction oceanic lithosphere.There have no or slightly crystallization fractionation but suffered seriously crustal contamination during magma upwelling.Intermediate to acidic and acidic series rocks have crustalderived magma source features,the crystallization fractionation of intermediate to acidic magma was unconspicuous during its evolution course,but it was quite obvious to the acidic series.The southward subduction of the Okhotsk oceanic lithosphere has played an important role to the tectonic setting at central part of Great Xing'an Range during Late Triassic,and appear back-arc extension signiture at the study area.This extension background leaded by asthenosphere magma upwelling which caused by subduction oceanic lithosphere delamination,and the asthenosphere magma upwelling provides energy to the primary magma generation for volcanic rocks of the Late Triassic Hadataolegai Fm.meanwhile.
【Fund】: 科技部“973”项目(No.2013CB429802);; 中国地质调查局地调项目(Nos.1212011120665 12120113053800 DD20160201-03)
【CateGory Index】: P534.51;P588.14
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