气候变化领域集成服务门户(CCPortal): Early Cambrian Muli arc–ophiolite complex: a relic of the Proto-Tethys oceanic lithosphere in the Qilian Orogen; NW China

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DOI	10.1007/s00531-019-01699-6
	Early Cambrian Muli arc–ophiolite complex: a relic of the Proto-Tethys oceanic lithosphere in the Qilian Orogen; NW China
	Yan Z.; Fu C.; Aitchison J.C.; Niu M.; Buckman S.; Cao B.
发表日期	2019
ISSN	14373254
起始页码	1147
结束页码	1164
卷号	108 期号:4
英文摘要	The Qilian Orogen in the northern margin of the Tibetan Plateau is the northernmost of the Tethyan domain. Abundant ophiolites record the closure of an early Tethyan ocean and amalgamations between micro-continents of North China, Qaidam, and Tarim. The Muli arc–ophiolite complex in the western segment of the South Qilian belt represents remnants of the Proto-Tethyan oceanic lithosphere. It comprises serpentinite, dunite, cumulate gabbro, basalt, plagiogranite, and chert, which are in tectonic contact with Upper Ordovician turbidites. Basalts have typical subduction-related calc-alkaline geochemical affinity, representing portions of an island arc. Geochemical results for plagiogranites and spinels from serpentinite indicate that the Muli arc–ophiolite complex represents a super-subduction zone (SSZ)-type ophiolite. U–Pb zircon data indicate formation associated with southward subduction of the Proto-Tethys Ocean during a short interval between 539 and 522 Ma. Results of petrology, geochemistry, and zircon U–Pb dating demonstrate that granitoids intruded into this complex are Middle to Late Ordovician (470–450 Ma) products of subduction-related arc magmatism. Voluminous Late Ordovician–Early Silurian rocks include deep-water marine siliciclastic and volcaniclastic turbidites and abundant volcanic arc rocks located to the south of the Muli arc–ophiolite complex, whereas fluvial coarse-grained sandstones and conglomerates unconformably overlie the Cambrian–Middle Ordovician ophiolite–arc systems in the eastern South Qilian belt. This indicates that closure of the Proto-Tethys Ocean was diachronous during the early Paleozoic. © 2019, Geologische Vereinigung e.V. (GV).
英文关键词	Arc-continent collision; Muli arc–ophiolite complex; Proto-Tethys Ocean; Qilian Orogen; SSZ-type ophiolite
语种	英语
scopus关键词	arc-continent collision; calc alkaline rock; Cambrian; oceanic lithosphere; ophiolite; orogeny; paleoceanography; subduction zone; turbidite; volcanic arc; China; Qilian Mountains
来源期刊	International Journal of Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/147846
作者单位	Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China; School of Earth and Environmental Sciences, University of Queensland, Brisbane, QLD 4072, Australia; Department of Resources and Environment, Hefei University of Technology, Hefei, 230009, China; School of Earth and Environmental Science, University of Wollongong, Wollongong, NSW 2522, Australia
推荐引用方式 GB/T 7714	Yan Z.,Fu C.,Aitchison J.C.,等. Early Cambrian Muli arc–ophiolite complex: a relic of the Proto-Tethys oceanic lithosphere in the Qilian Orogen; NW China[J],2019,108(4).
APA	Yan Z.,Fu C.,Aitchison J.C.,Niu M.,Buckman S.,&Cao B..(2019).Early Cambrian Muli arc–ophiolite complex: a relic of the Proto-Tethys oceanic lithosphere in the Qilian Orogen; NW China.International Journal of Earth Sciences,108(4).
MLA	Yan Z.,et al."Early Cambrian Muli arc–ophiolite complex: a relic of the Proto-Tethys oceanic lithosphere in the Qilian Orogen; NW China".International Journal of Earth Sciences 108.4(2019).