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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
Fu, Changlei1,2; Yan, Zhen1; Aitchison, Jonathan C.3; Xiao, Wenjiao4,5; Buckman, Solomon6; Wang, Bingzhang2; Zhai, Qingguo1
2022
Source PublicationPALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
Volume585Pages:12
AbstractLajishan 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.
KeywordOceanic arc volcanic rocks U-Pb age Intra-oceanic subduction Subduction initiation South Qilian Ocean Qilian Orogen
DOI10.1016/j.palaeo.2021.110713
Funding OrganizationNational 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
WOS KeywordCENTRAL QILIAN BLOCK ; TECTONIC EVOLUTION ; GEOCHEMICAL CHARACTERISTICS ; OPHIOLITE COMPLEX ; NW CHINA ; U-PB ; OROGEN ; CONSTRAINTS ; ACCRETIONARY ; MAGMATISM
Language英语
Funding ProjectNational 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]
Funding OrganizationNational 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
WOS Research AreaPhysical Geography ; Geology ; Paleontology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS IDWOS:000744171200002
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/104006
Collection岩石圈演化国家重点实验室
Corresponding AuthorFu, Changlei
Affiliation1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
2.Qinghai Geol Survey Inst, Key Lab Northern Qinghai Tibet Plateau Geol Proc, Xining 810012, Peoples R China
3.Univ Queensland, Sch Earth & Environm Sci, Brisbane, Qld 4072, Australia
4.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Urumqi 830011, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
6.Univ Wollongong, GeoQuEST Res Ctr, Sch Earth Atmospher & Life Sci, Wollongong, NSW 2522, Australia
Recommended Citation
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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