Late Jurassic adakitic ore-bearing granodiorite porphyry intrusions in the Xiaokele porphyry Cu(–Mo)deposit,Northeast China:implications for petrogenesis and tectonic setting  

作　　者：Yonggang Sun Bile Li Zhonghai Zhao Qingfeng Ding Fanbo Meng Xusheng Chen Ye Qian Yujin Li 

机构地区：[1]College of Earth Sciences,Jilin University,2199 Jianshe Street,Changchun 130061,China [2]College of Mining,Liaoning Technical University,Fuxin 123000,China [3]Qiqihaer Institute of Geological Exploration,Heilongjiang 161006,China [4]Key Laboratory of Mineral Resources Evaluation in Northeast Asia,Ministry of Land and Resources,Changchun 130061,China

出　　处：《Acta Geochimica》2021年第5期702-717,共16页地球化学学报（英文）

基　　金：the National Natural Science Foundation of China(No.41272093);National Key R&D Program of China(No.2017YFC0601304);Natural Science Foundation of Jilin Province(No.20180101089JC);Key Projects of Science and Technology Development Plan of Jilin Province(No.20100445);Self-determined Foundation of Key Laboratory of Mineral Resources Evaluation in Northeast Asia,Ministry of Natural Resources(No.DBY-ZZ-19-04);Heilongjiang Research Project of Land and Resources(No.201605 and 201704)。

摘　　要：The Xiaokele Cu(–Mo)deposit is a recently discovered porphyry deposit in the northern Great Xing’an Range(GXR)of northeast China.The ore bodies in this deposit are mainly hosted within granodiorite porphyry intrusions.Potassic,phyllic,and propylitic alteration zones develop from center to edge.In this paper,we present zircon LA–ICP–MS U–Pb ages,zircon Hf isotopic compositions,and whole-rock geochemistry of the ore-bearing granodiorite porphyries from the Xiaokele Cu(–Mo)deposit.Zircon U–Pb dating suggests that the Xiaokele granodiorite porphyries were emplaced at 148.8±1.1 Ma(weighted-mean age;n=14).The Xiaokele granodiorite porphyries display high SiO2,Al2O3,Sr,and Sr/Y,low K2O/Na2O,MgO,Yb,and Y,belonging to high-SiO2 adakites produced by partial melting of the subducted oceanic slab.Marine sediments were involved in the magma source of the Xiaokele granodiorite porphyries,as indicated by enriched Sr–Nd isotopic compositions(eNd(-t)=-1.17–-0.27),low positive zircon eHf(t)values(0.4–2.2),and high Th contents(4.06–5.20).The adakitic magma subsequently interacted with the mantle peridotites during ascent through the mantle wedge.The Xiaokele granodiorite porphyries were derived from slab melting during the southward subduction of the Mongol–Okhotsk Ocean.

关 键 词：Xiaokele porphyry Cu(–Mo)deposit ADAKITE Slab melting Mongol–Okhotsk Ocean Northern Great Xing’an Range 

分 类 号：P618.41[天文地球—矿床学] P588.12[天文地球—地质学]