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Geochemistry and petrogenesis of the early Palaeozoic appinite-granite complex in the Western Kunlun Orogenic Belt, NW China: implications for Palaeozoic tectonic evolution
JIE ZHU;  QIUGEN LI;  XU CHEN;  HAOSHU TANG;  ZONGQI WANG;  YANJING CHEN;  SHUWEN LIU;   BING XIAO;  JUNLU CHEN
2018
发表期刊Geological Magazine
卷号155期号:8页码:1641-1666
摘要

The Datong pluton, the largest early Palaeozoic granitoid in the Western Kunlun Orogenic Belt (WKOB) in NW China, is a typical appinite-granite complex. It consists of diorites, quartz diorites, monzodiorites, quartz monzodiorites, monzonites, quartz monzonites, syenites, granodiorites and monzogranites. Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) zircon U-Pb dating yielded crystallization ages of 459 +/- 3 Ma for the quartz monzonites and 452 +/- 5 Ma for the monzogranites (Late Ordovician). The rocks possess a wide range of SiO2 (56.0-73.4 wt %), MgO (0.17-4.55 wt %) and Mg no. (25-60), with high K2O (2.83-5.29 wt %) contents, exhibiting high-K calc-alkaline to shoshonitic traits. They are characterized by enrichments in large-ion lithophile elements (LILEs) and light rare Earth elements (LREEs), as well as depletions in high-field-strength elements (HFSEs). The rocks have initial Sr-87/Sr-86 ratios of 0.7086-0.7185, negative epsilon(Nd)(t) values of -3.72 to -1.79 and epsilon(Hf)(t) values vary from -1.6 to +4.7. These features are modelled to show that they were most likely derived from an enriched lithospheric mantle source and that fractional crystallization with minor crustal contamination was involved in their petrogenetic process. Considering the distribution and chronology of the Palaeozoic intrusions - such as Kegang, Bulong, Qiukesu, Yierba, North Kudi, Dongbake, Buya, Ayilixi and Warengzilafu granitoid plutons with ages of c. 420-530 Ma - in conjunction with the Palaeozoic metamorphic overprinting in the WKOB, we propose a divergent double-subduction model to explain the destruction of the Proto-Tethys Ocean and suggest that the Datong pluton was likely emplaced in a post-collisional setting following the termination of subduction in response to slab break-off.

关键词Appinite-granite Zircon U–pb Dating Geochemistry Double Subduction Western Kunlun Orogenic Belt
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/8883
专题矿床地球化学国家重点实验室
作者单位1.The Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China
2.Department of Energy and Mineral Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, US
3.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550008, China
4.Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
5.Xi’an Institute of Geology and Mineral Resource, Xi’an 710054, China
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JIE ZHU;QIUGEN LI;XU CHEN;HAOSHU TANG;ZONGQI WANG;YANJING CHEN;SHUWEN LIU; BING XIAO;JUNLU CHEN. Geochemistry and petrogenesis of the early Palaeozoic appinite-granite complex in the Western Kunlun Orogenic Belt, NW China: implications for Palaeozoic tectonic evolution[J]. Geological Magazine,2018,155(8):1641-1666.
APA JIE ZHU;QIUGEN LI;XU CHEN;HAOSHU TANG;ZONGQI WANG;YANJING CHEN;SHUWEN LIU; BING XIAO;JUNLU CHEN.(2018).Geochemistry and petrogenesis of the early Palaeozoic appinite-granite complex in the Western Kunlun Orogenic Belt, NW China: implications for Palaeozoic tectonic evolution.Geological Magazine,155(8),1641-1666.
MLA JIE ZHU;QIUGEN LI;XU CHEN;HAOSHU TANG;ZONGQI WANG;YANJING CHEN;SHUWEN LIU; BING XIAO;JUNLU CHEN."Geochemistry and petrogenesis of the early Palaeozoic appinite-granite complex in the Western Kunlun Orogenic Belt, NW China: implications for Palaeozoic tectonic evolution".Geological Magazine 155.8(2018):1641-1666.
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