Origin of C type adakite magmas in the NE Xing'an block, NE China and tectonic implication

查看全文 作　　者：Changzhou [1]Deng;Guangyi [2,3]Sun;Deyou [1]Sun;Hu [4]Huang;Jianfeng [5]Zhang;Jun [1]Gou

机构地区：[1]College of Earth Sciences, Jilin University, Changchun 130061, China;[2]State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;[3]University of Chinese Academy of Sciences, Beijing 100049,China;[4]Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China;[5]Heilongjiang Institute of Geological Survey, Harbin 150036,China

出　　处：《Acta Geochimica》索引2018年第37卷第2期,共14页

基　　金：supported by the regional geology and mineralization research program of Heilongjiang province (HLJKD201417) 摘　　要：In this paper, we report new whole-rock geochemical and zircon U–Pb data for monzogranites in the NE Xing'an block. These data constrained the petrogenesis of C type(high Sr/Y) adakitic rocks and showed the spatial extent of the influence of the Mongol-Okhostsk ocean tectonic regime and the collision between the Jiamusi Massif and Songliao Terrane. New zircon laser-ablation inductivity coupled plasma mass spectrometry(LA-ICP-MS) U–Pb data indicated that the monzogranites in the studied area were emplaced in the Early Jurassic(~180 Ma). These rocks were characterized by unusally high SiO_2(C67.49), and Sr(461–759 ppm), but strikingly low Y(4.63–8.06 ppm) and HREE(P HREE = 3.83–6.49 ppm, Yb = 0.5–0.77 ppm)contents, with therefore high Sr/Y(67.2–119) and(La/Yb)N(29.7–41.5) ratios, showing the geochemical characteristics of C type adakitic granite. The data displayed negligible Eu anomalies(Eu/Eu~ = 0.77–1.08), LREE-enriched and pronounced negative Nb and Ta anomalies. The C-typeadakites in the studied area were most likely derived from the partial melting of a thickened lower continental curst. The magma source is most likely dominated by amphibolites and garnet amphibolites. In combination with previously-reported data from igneous rocks from the Mesozoic in NE China, we conclude that the Xing'an block was influenced by the Mongol-Okhotsk subduction tectonic system, and experiences compressive settings from the amalgamation of the Jiamusi block in the east of the CAOB. 关键词：构造系统岩浆来源 ADAKITE NE 类型中国数据显示起源

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Origin of C type adakite magmas in the NE Xing'an block, NE China and tectonic implication

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