中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 地质与地球物理研究所
  3. 中国科学院地质与地球物理研究所
  4. 岩石圈演化国家重点实验室
Petrogenesis of Early Cambrian granitoids in the western Kunlun orogenic belt, Northwest Tibet: Insight into early stage subduction of the Proto-Tethys Ocean

文献类型：期刊论文

作者Yin, Jiyuan2,3,4; Xiao, Wenjiao5,6; Sun, Min4; Chen, Wen3; Yuan, Chao1; Zhang, Yunying4; Wang, Tao3; Du, Qiuyi3; Wang, Xiangsong4; Xia, Xiaoping1
刊名GEOLOGICAL SOCIETY OF AMERICA BULLETIN
出版日期2020-09-01
卷号132期号:9-10页码:2221-2240
ISSN号0016-7606
DOI10.1130/B35408.1
英文摘要The west Kunlun orogenic belt, located on the northwest margin of the Tibetan Plateau, represents a crucial tectonic junction between the central Asia and Tethys domains. Its evolution was closely related to the Paleozoic subduction and closure of the Proto-Tethys Ocean, which was formed by the breakup of the Rodinia supercontinent following the Neoproterozoic. However, the early evolution of Proto-Tethys oceanic subduction (e.g., subduction initiation timing, polarity, and process) remains controversial. The source of the Early Cambrian granitoids is also unclear. To explore these questions, four Cambrian plutons (i.e., two Tianshuihai monzogranites and south Kunlun diorite and monzogranite) were chosen for geochronological and geochemical studies. Zircon U-Pb dating reveals that these plutons formed at ca. 533-513 Ma and thus represent the oldest arc-related magmatism in the west Kunlun orogenic belt. The Tianshuihai monzogranites have positive epsilon Nd(t) values (+0.76 to +1.34) and zircon epsilon Hf(t) values of +0.25 to +6.42, with low delta O-18(zrn) values of +5.11 parts per thousand to +7.38 parts per thousand, suggesting that their source includes juvenile material. These rocks are weakly peraluminous and have relatively old Hf model ages of 1.09-1.48 Ga. Mass balance calculations show that the Tianshuihai monzogranites were derived from partial melting of Mesoproterozoic meta-igneous rocks with the addition of 22% of juvenile material. The south Kunlun monzogranites in this study are weakly peraluminous, and their lowest epsilon Nd(t) values are -9.24 to -9.27 and zircon epsilon Hf(t) values are -7.80 to -11.2. The oldest Hf model ages are 1.97-2.18 Ga, and the highest zircon delta O-18(zrn) values are +8.11 to +9.73 parts per thousand. Their isotopic compositions are different from those of the magmas derived from partial melting of just Paleoproterozoic and Mesoproterozoic basement rocks but can be produced by a mixing source of 32% metaigneous rock and 68% meta-sedimentary rock. The south Kunlun diorites are characterized by high Sr contents and relatively high Sr/Y (52-63) ratios but low Y, Yb, Cr, and Ni contents, like those of the thickened continental crust-derived adakites. Their Sr-Nd-Hf-O isotopic compositions indicate that their parental magma was derived from a Mesoproterozoic metaigneous basement in the garnet stability field. Based on the newly identified, oldest island arc magmatic records in the west Kunlun orogenic belt, the subduction initiation of the Proto-Tethys oceanic slab must have occurred prior to the Early Cambrian (>533 Ma). Our results, with previously published data, show that the west Kunlun orogenic belt was in an extensional setting during the Early Cambrian and that the magmatism migrated northeastward along the axis of the south Kunlun terrane between 533 Ma and 513 Ma. Therefore, considering the spatial and temporal distribution and petrogenesis of the Early-Middle Cambrian plutons in the west Kunlun orogenic belt, we propose that the Early Cambrian magmatism was most plausibly triggered by asthenospheric upwelling in response to the rollback of southward-subducted Proto-Tethys oceanic slab.
WOS关键词POTASSIC MICROGRANULAR ENCLAVES ; S-TYPE GRANITES ; CALC-ALKALINE GRANITOIDS ; THICKENED LOWER CRUST ; A-TYPE GRANITES ; TECTONIC EVOLUTION ; CONTINENTAL-CRUST ; NW CHINA ; I-TYPE ; ACCRETIONARY TECTONICS
资助项目second Tibet Plateau Scientific Expedition and Research Program (STEP)[2019QZKK0802] ; National Key R and D 445 Program of China[2017YFC0601206] ; Chinese Academy of Sciences[XDB18020203] ; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources Fund[J1901-5] ; National Science Foundation of China[41473053] ; National Science Foundation of China[41573045] ; National Science Foundation of China[41873060] ; National Science Foundation of China[41830216] ; China Geological Survey[DD20190001] ; China Geological Survey[DD20190004] ; Hong Kong RGC research projects[17303415] ; Hong Kong RGC research projects[17302317]
WOS研究方向Geology
语种英语
WOS记录号WOS:000565754100025
出版者GEOLOGICAL SOC AMER, INC
资助机构second Tibet Plateau Scientific Expedition and Research Program (STEP) ; second Tibet Plateau Scientific Expedition and Research Program (STEP) ; National Key R and D 445 Program of China ; National Key R and D 445 Program of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources Fund ; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources Fund ; National Science Foundation of China ; National Science Foundation of China ; China Geological Survey ; China Geological Survey ; Hong Kong RGC research projects ; Hong Kong RGC research projects ; second Tibet Plateau Scientific Expedition and Research Program (STEP) ; second Tibet Plateau Scientific Expedition and Research Program (STEP) ; National Key R and D 445 Program of China ; National Key R and D 445 Program of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources Fund ; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources Fund ; National Science Foundation of China ; National Science Foundation of China ; China Geological Survey ; China Geological Survey ; Hong Kong RGC research projects ; Hong Kong RGC research projects ; second Tibet Plateau Scientific Expedition and Research Program (STEP) ; second Tibet Plateau Scientific Expedition and Research Program (STEP) ; National Key R and D 445 Program of China ; National Key R and D 445 Program of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources Fund ; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources Fund ; National Science Foundation of China ; National Science Foundation of China ; China Geological Survey ; China Geological Survey ; Hong Kong RGC research projects ; Hong Kong RGC research projects ; second Tibet Plateau Scientific Expedition and Research Program (STEP) ; second Tibet Plateau Scientific Expedition and Research Program (STEP) ; National Key R and D 445 Program of China ; National Key R and D 445 Program of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources Fund ; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources Fund ; National Science Foundation of China ; National Science Foundation of China ; China Geological Survey ; China Geological Survey ; Hong Kong RGC research projects ; Hong Kong RGC research projects
源URL[http://ir.iggcas.ac.cn/handle/132A11/97787]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Yin, Jiyuan
作者单位1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
2.Chinese Acad Geol Sci, Inst Geol, Baiwanzhuang Rd 26, Beijing 100037, Peoples R China
3.Chinese Acad Geol Sci, Inst Geol, Key Lab Deep Earth Dynam, Minist Nat Resources, Beijing 100037, Peoples R China
4.Univ Hong Kong, Dept Earth Sci, Pokflam Rd, Hong Kong, Peoples R China
5.Chinese Acad Sci, Xinjiang Res Ctr Mineral Resources, Xinjiang Inst Ecol & Geog, Urumqi 830011, Peoples R China
6.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Yin, Jiyuan,Xiao, Wenjiao,Sun, Min,et al. Petrogenesis of Early Cambrian granitoids in the western Kunlun orogenic belt, Northwest Tibet: Insight into early stage subduction of the Proto-Tethys Ocean[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2020,132(9-10):2221-2240.
APA Yin, Jiyuan.,Xiao, Wenjiao.,Sun, Min.,Chen, Wen.,Yuan, Chao.,...&Xia, Xiaoping.(2020).Petrogenesis of Early Cambrian granitoids in the western Kunlun orogenic belt, Northwest Tibet: Insight into early stage subduction of the Proto-Tethys Ocean.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,132(9-10),2221-2240.
MLA Yin, Jiyuan,et al."Petrogenesis of Early Cambrian granitoids in the western Kunlun orogenic belt, Northwest Tibet: Insight into early stage subduction of the Proto-Tethys Ocean".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 132.9-10(2020):2221-2240.

入库方式： OAI收割

来源：地质与地球物理研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。