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Relicts of a Cambrian oceanic arc in the Lajishan suture, NE Tibetan Plateau: Evidence for early-stage subduction within the Proto-Tethyan Ocean

文献类型：期刊论文

作者Fu, Changlei1,6; Yan, Zhen6; Aitchison, Jonathan C.2; Xiao, Wenjiao3,4; Buckman, Solomon5; Wang, Bingzhang1; Zhai, Qingguo6
刊名PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
出版日期2022
卷号585页码:12
关键词Oceanic arc volcanic rocks U-Pb age Intra-oceanic subduction Subduction initiation South Qilian Ocean Qilian Orogen
ISSN号0031-0182
DOI10.1016/j.palaeo.2021.110713
英文摘要Lajishan suture in the Qilian Orogen records subduction process of the southern branch of the Proto-Tethyan Ocean. However, when and where the subduction started remain controversial issues. We present a study of the Cambrian volcanic rocks from the Lajishan suture. These volcanic rocks are coherent and composed of basalt, andesite, and volcanic breccia with minor interlayers or veins of dacite and rhyolite. Zircons from the dacite and rhyolite yield concordant Early-Middle Cambrian ages ranging from 521 to 510 Ma. Basalt and andesite exhibit subduction-related geochemical signatures with enrichment in large ion lithophile elements and depletion in high field strength elements. They have evolved REE, LREE, epsilon(Nd)(t) (+2.6 to +8.2), and (La/Sm)N ratios, sug-gesting derivation from depleted mantle wedge with addition of hydrous fluid or various amounts of sediment-derived melts. Dacite and rhyolite have positive zircon epsilon(Hf)(t) values (+6.1 to +11.6) and whole-rock epsilon(Nd)(t) values (+1.7 to +4.2). They were generated by partial melting of juvenile mafic crust resulting from magma under -plating. These Cambrian volcanic rocks in the Lajishan suture are exposed to the south of the accretionary complex and therefore are likely to be relicts of Cambrian oceanic arc built on the oceanic crust during south-ward subduction of the South Qilian Ocean. Considering the Cambrian-Ordovician intra-oceanic trench-arc-basin system reconstructed in the North Qilian suture, it is suggested that both southern and northern branches of the Proto-Tethyan Ocean have experienced intra-oceanic subduction process which initiated at ca. 530 Ma.
WOS关键词CENTRAL QILIAN BLOCK ; TECTONIC EVOLUTION ; GEOCHEMICAL CHARACTERISTICS ; OPHIOLITE COMPLEX ; NW CHINA ; U-PB ; OROGEN ; CONSTRAINTS ; ACCRETIONARY ; MAGMATISM
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] ; Bureau of Geolog-ical Exploration and Development of Qinghai Province[[2021] 16] ; Talents Project of Qinghai Province ; Institute of Geology, Chinese Academy of Geological Sciences[S2007]
WOS研究方向Physical Geography ; Geology ; Paleontology
语种英语
WOS记录号WOS:000744171200002
出版者ELSEVIER
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 Geolog-ical Exploration and Development of Qinghai Province ; Bureau of Geolog-ical Exploration and Development of Qinghai Province ; Talents Project of Qinghai Province ; Talents Project of Qinghai Province ; Institute of Geology, Chinese Academy of Geological Sciences ; Institute of Geology, Chinese Academy of Geological Sciences ; 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 Geolog-ical Exploration and Development of Qinghai Province ; Bureau of Geolog-ical Exploration and Development of Qinghai Province ; Talents Project of Qinghai Province ; Talents Project of Qinghai Province ; Institute of Geology, Chinese Academy of Geological Sciences ; Institute of Geology, Chinese Academy of Geological Sciences ; 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 Geolog-ical Exploration and Development of Qinghai Province ; Bureau of Geolog-ical Exploration and Development of Qinghai Province ; Talents Project of Qinghai Province ; Talents Project of Qinghai Province ; Institute of Geology, Chinese Academy of Geological Sciences ; Institute of Geology, Chinese Academy of Geological Sciences ; 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 Geolog-ical Exploration and Development of Qinghai Province ; Bureau of Geolog-ical Exploration and Development of Qinghai Province ; Talents Project of Qinghai Province ; Talents Project of Qinghai Province ; Institute of Geology, Chinese Academy of Geological Sciences ; Institute of Geology, Chinese Academy of Geological Sciences
源URL[http://ir.iggcas.ac.cn/handle/132A11/104006]  
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.Qinghai Geol Survey Inst, Key Lab Northern Qinghai Tibet Plateau Geol Proc, Xining 810012, Peoples R China
2.Univ Queensland, Sch Earth & Environm Sci, Brisbane, Qld 4072, Australia
3.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Urumqi 830011, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
5.Univ Wollongong, GeoQuEST Res Ctr, Sch Earth Atmospher & Life Sci, Wollongong, NSW 2522, Australia
6.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
推荐引用方式
GB/T 7714		 Fu, Changlei,Yan, Zhen,Aitchison, Jonathan C.,et al. Relicts of a Cambrian oceanic arc in the Lajishan suture, NE Tibetan Plateau: Evidence for early-stage subduction within the Proto-Tethyan Ocean[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2022,585:12.
APA Fu, Changlei.,Yan, Zhen.,Aitchison, Jonathan C..,Xiao, Wenjiao.,Buckman, Solomon.,...&Zhai, Qingguo.(2022).Relicts of a Cambrian oceanic arc in the Lajishan suture, NE Tibetan Plateau: Evidence for early-stage subduction within the Proto-Tethyan Ocean.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,585,12.
MLA Fu, Changlei,et al."Relicts of a Cambrian oceanic arc in the Lajishan suture, NE Tibetan Plateau: Evidence for early-stage subduction within the Proto-Tethyan Ocean".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 585(2022):12.

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来源：地质与地球物理研究所

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