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Petrogenesis and tectonic implications of the quartz diorites and mafic microgranular enclaves in the Asiha gold ore deposit in the East Kunlun orogenic belt: Evidence from zircon U-Pb dating, geochemistry, and Sr-Nd-Hf isotopes

文献类型：期刊论文

作者Kong, Huilei1,4; Liu, Yuegao3; Zhang, Jiangwei1; Lin, Jiqing2; Jia, Qunzi1; Li, Jinchao1; Gao, Yijie1
刊名GEOLOGICAL JOURNAL
出版日期2021-12-27
页码24
ISSN号0072-1050
关键词Asiha gold ore deposit East Kunlun mafic microgranular enclaves magma mixing post-collision syn-collision
DOI10.1002/gj.4373
通讯作者Liu, Yuegao
英文摘要Calc-alkaline granitoid intrusions with abundant mafic microgranular enclaves (MMEs) are widespread in the East Kunlun orogenic belt (EKOB). Here, we present petrological observations, zircon U-Pb ages, whole-rock geochemical, and Sr-Nd-Hf isotopic data for quartz diorites and the MMEs in the Asiha gold ore deposit in the EKOB, to constrain their petrogenesis and tectonic setting. The laser ablation inductively coupled plasma mass spectrometer Pb-206-U-238 ages of zircons indicate that the host quartz diorites and their MMEs from the Asiha gold deposit crystallized at 228.4 +/- 1.7 Ma and 229.0 +/- 1.7 Ma, respectively, which is similar to the gold mineralization age. Whole-rock geochemical data indicate that the quartz diorites are I-type granites. The MMEs have epsilon Hf(t) values of -7.6 to -0.2, -2.1 on average, whereas those of the quartz diorites range from -3.2 to -0.8, with a mean value of -2.1, which is identical within analytical uncertainty. Moreover, the host quartz diorites and their MMEs have relatively homogeneous Sr-Nd isotopic compositions, with high initial Sr-87/Sr-86 ratios and low epsilon Nd(t) values ranging from 0.70914 to 0.70963 and from -5.9 to -5.5, respectively. In summary, the MMEs and host quartz diorites have similar geochemical characteristics, indistinguishable Sr-Nd-Hf isotopic composition, and almost simultaneous crystallization age. Geochemical evidence shows that they formed due to the mixing of crust- and mantle-derived magmas. Combined with our new results and published geological, geochronological, and geochemical data, this paper proposes that the EKOB had evolved into a post-collisional environment at about 230-228 Ma, and the host quartz diorites and their MMEs from the Asiha complex formed in the transitional stage from the syn-collisional to the post-collisional setting.
WOS关键词QINGHAI-TIBET PLATEAU ; LATE TRIASSIC GRANITOIDS ; A-TYPE GRANITES ; I-TYPE GRANITES ; NORTHERN TIBET ; VOLCANIC-ROCKS ; ULTRAMAFIC COMPLEX ; CHINA PETROGENESIS ; O ISOTOPES ; NW CHINA
WOS研究方向Geology
语种英语
出版者WILEY
WOS记录号WOS:000734439000001
源URL[http://ir.idsse.ac.cn/handle/183446/9369]  
专题深海科学研究部_深海极端环境模拟研究实验室
通讯作者Liu, Yuegao
作者单位1.Xian Ctr China Geol Survey, Northwest China Ctr Geosci Innovat, Key Lab Study Focused Magmatism & Giant Ore Depos, MNR, Xian, Peoples R China
2.403 Geol Brigade Sichuan Bur Geol & Mineral Resou, Emei, Peoples R China
3.Chinese Acad Sci, Inst Deep Sea Sci & Engn, CAS Key Lab Expt Study Deep Sea Extreme Condit, Sanya 572000, Peoples R China
4.Chinese Acad Geol Sci, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Kong, Huilei,Liu, Yuegao,Zhang, Jiangwei,et al. Petrogenesis and tectonic implications of the quartz diorites and mafic microgranular enclaves in the Asiha gold ore deposit in the East Kunlun orogenic belt: Evidence from zircon U-Pb dating, geochemistry, and Sr-Nd-Hf isotopes[J]. GEOLOGICAL JOURNAL,2021:24.
APA Kong, Huilei.,Liu, Yuegao.,Zhang, Jiangwei.,Lin, Jiqing.,Jia, Qunzi.,...&Gao, Yijie.(2021).Petrogenesis and tectonic implications of the quartz diorites and mafic microgranular enclaves in the Asiha gold ore deposit in the East Kunlun orogenic belt: Evidence from zircon U-Pb dating, geochemistry, and Sr-Nd-Hf isotopes.GEOLOGICAL JOURNAL,24.
MLA Kong, Huilei,et al."Petrogenesis and tectonic implications of the quartz diorites and mafic microgranular enclaves in the Asiha gold ore deposit in the East Kunlun orogenic belt: Evidence from zircon U-Pb dating, geochemistry, and Sr-Nd-Hf isotopes".GEOLOGICAL JOURNAL (2021):24.

入库方式： OAI收割

来源：深海科学与工程研究所

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