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  4. 岩石圈演化国家重点实验室
Cambrian intra-oceanic subduction within the southern branch of the Proto-Tethyan Ocean: Constraints from rhyolites in the Lajishan suture, NE Tibetan Plateau

文献类型：期刊论文

作者Fu, Changlei2,3; Yan, Zhen2; Aitchison, Jonathan C.4; Xiao, Wenjiao1,7; Wang, Bingzhang3; Buckman, Solomon6; Li, Wufu3; Guo, Shuhua5
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2022-07-01
卷号232页码:13
ISSN号1367-9120
关键词Oceanic arc rhyolite zircon U-Pb age Intra-oceanic subduction Tectonic framework Proto-Tethyan Ocean Qilian Orogen
DOI10.1016/j.jseaes.2022.105124
英文摘要The South Qilian suture in the Qilian Orogen is an early Paleozoic belt that developed as a result of closure of the southern branch of the Proto-Tethyan Ocean. It is characterized by widespread Cambrian intermediate-basic volcanic rocks which record the early-stage evolution of the paleo-ocean basin. However, Cambrian evolution of the paleo-ocean basin remains controversial due to the lack of research on the age and tectonic affinity of these volcanic rocks. In this study, we identified rhyolites from the intermediate-basic volcanic rocks in the South Qilian suture. They occur as pebbles in the breccias, or as veins and interlayers within the intermediate-basic volcanic rocks. Zircon U-Pb datings yield ages of 514.0 +/- 2.8 Ma, 521 +/- 4 Ma, 523 +/- 5 Ma, and 513 +/- 9 Ma for four rhyolites, respectively. The Cambrian rhyolites show variable La/Sm ratios and Rb contents and positive zircon epsilon Hf(t) values (+6.8 to +14.6) and whole-rock epsilon Nd(t) values (+2.1 to +4.6), suggesting that they were derived from partial melting of juvenile mafic crust. They also have high Al2O3 and CaO contents, as well as low K2O and trace element concentrations, which are similar to those of oceanic arc rhyolite. These early Cambrian oceanic arc rhyolites, along with the SSZ-type ophiolite (ca. 530-520 Ma) to the north and late-stage granitoid intrusions (ca. 474-450 Ma), indicate that the southern branch of the Proto-Tethyan Ocean experienced southward intra-oceanic subduction during the early Cambrian-early Ordovician period.
WOS关键词EASTERN QILIAN OROGEN ; ARC VOLCANIC-ROCKS ; TECTONIC EVOLUTION ; ACCRETIONARY BELT ; OPHIOLITE COMPLEX ; U-PB ; CHINA ; BLOCK ; PETROGENESIS ; GEOCHEMISTRY
资助项目National Natural Science Foundation of China[42072266] ; National Natural Science Foundation of China[41872241] ; National Natural Science Foundation of China[41702239] ; National Natural Science Foundation of China[41672221] ; China Postdoctoral Science Foundation[2021M691702] ; China Geological Survey[DD20190006] ; China Geological Survey[DD20160201-04] ; China Geological Survey[12120114079701] ; Bureau of Geological Exploration and Development of Qinghai Province[[2021] 61] ; Talents Project of Qinghai Prov-ince
WOS研究方向Geology
语种英语
出版者PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号WOS:000809882000001
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Geological Survey ; China Geological Survey ; Bureau of Geological Exploration and Development of Qinghai Province ; Bureau of Geological Exploration and Development of Qinghai Province ; Talents Project of Qinghai Prov-ince ; Talents Project of Qinghai Prov-ince ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Geological Survey ; China Geological Survey ; Bureau of Geological Exploration and Development of Qinghai Province ; Bureau of Geological Exploration and Development of Qinghai Province ; Talents Project of Qinghai Prov-ince ; Talents Project of Qinghai Prov-ince ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Geological Survey ; China Geological Survey ; Bureau of Geological Exploration and Development of Qinghai Province ; Bureau of Geological Exploration and Development of Qinghai Province ; Talents Project of Qinghai Prov-ince ; Talents Project of Qinghai Prov-ince ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Geological Survey ; China Geological Survey ; Bureau of Geological Exploration and Development of Qinghai Province ; Bureau of Geological Exploration and Development of Qinghai Province ; Talents Project of Qinghai Prov-ince ; Talents Project of Qinghai Prov-ince
源URL[http://ir.iggcas.ac.cn/handle/132A11/106103]  
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Fu, Changlei
作者单位1.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Urumqi 830011, Peoples R China
2.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
3.Qinghai Geol Survey Inst, Key Lab Northern Qinghai Tibet Plateau Geol Proc &, Xining 810012, Peoples R China
4.Univ Queensland, Sch Earth & Environm Sci, Brisbane 4072, Australia
5.Bur Geol Explorat & Dev Qinghai Prov, Xining 810001, Peoples R China
6.Univ Wollongong, GeoQuEST Res Ctr, Sch Earth Atmospher & Life Sci, Wollongong 2522, Australia
7.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		 Fu, Changlei,Yan, Zhen,Aitchison, Jonathan C.,et al. Cambrian intra-oceanic subduction within the southern branch of the Proto-Tethyan Ocean: Constraints from rhyolites in the Lajishan suture, NE Tibetan Plateau[J]. JOURNAL OF ASIAN EARTH SCIENCES,2022,232:13.
APA Fu, Changlei.,Yan, Zhen.,Aitchison, Jonathan C..,Xiao, Wenjiao.,Wang, Bingzhang.,...&Guo, Shuhua.(2022).Cambrian intra-oceanic subduction within the southern branch of the Proto-Tethyan Ocean: Constraints from rhyolites in the Lajishan suture, NE Tibetan Plateau.JOURNAL OF ASIAN EARTH SCIENCES,232,13.
MLA Fu, Changlei,et al."Cambrian intra-oceanic subduction within the southern branch of the Proto-Tethyan Ocean: Constraints from rhyolites in the Lajishan suture, NE Tibetan Plateau".JOURNAL OF ASIAN EARTH SCIENCES 232(2022):13.

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来源：地质与地球物理研究所

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