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Article by Zhao D
Article by Ji Z
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Article by Chen H
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2. ���ִ�ѧ �����ǹ��ʵ�ѧ�о����ѧ����, ���� 130026;
3. �������ʵ�������, ���� 110034
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Petrogenesis of Late Carboniferous granites in Boketu region of northern Great Xing'an Range: evidence from zircon U-Pb age, geochemistry and Lu-Hf isotopes
ZHAO Di1, JI Zheng1, YANG Hao1, HE Yue1, JING Yan1, WANG Qing-hai2, CHEN Hui-jun3
1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. International Center for Geoscience Research and Education in Northeast Asia, Jilin University, Changchun 130026, China;
3. Shengyang Institute of Geology and Mineral Resources, Shengyang 110034, China
Abstract: Gaojishan pluton in Boketu area of northern Great Xing'an Range is composed of alkali feldspar granites. LA-ICP-MS zircon U-Pb dating result shows that Gaojishan pluton formed in Late Carboniferous (~311 Ma). The geochemical data indicates that alkali feldspar granites are characterized by high SiO2 and K2O, but low total Fe2O3 and MgO, with significant fractionation of HREE relative to LREE[(La/Yb)N=5.00~14.19], and they are enriched in large ion lithophile elements (e.g., Rb, K) and depleted in high field-strength elements (e.g., Nb, Ta, Ti) and P, with negative Eu anomalies(Eu/Eu*=0.47~0.72), ��REE=49.07×10-6~139.30×10-6 and LREE/HREE=7.93~13.98. Zircon Lu-Hf isotope characteristics show that the alkali feldspar granites have positive ��Hf (t) values of +8.46~+12.94, and young Hf two-stage model ages of 501~783 Ma. Combined with regional geological investigation, it is suggested that the Late Carboniferous Gaojishan pluton in northern Great Xing'an Range was product of the partial melting of newly accreted juvenile crustal material during Neoproterozoic, which possibly related to the subduction of the Paleo-Asian oceanic plate.
Keywords: Great Xing'an Range   granites   geochemistry   geochronology   subduction  
�ո����� 2018-05-02 �޻����� 2018-06-12 ����淢������  
DOI: 10.3969/j.issn.1004-5589.2018.03.005
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