气候变化领域集成服务门户(CCPortal): Petrogenesis of the southern Qiangtang mafic dykes, Tibet: Link to a late Paleozoic mantle plume on the northern margin of Gondwana?

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DOI	10.1130/B35110.1
	Petrogenesis of the southern Qiangtang mafic dykes, Tibet: Link to a late Paleozoic mantle plume on the northern margin of Gondwana?
	Wang M.; Li C.; Zeng X.-W.; Li H.; Fan J.-J.; Xie C.-M.; Hao Y.-J.
发表日期	2019
ISSN	167606
起始页码	1907
结束页码	1919
卷号	131 期号:2021-11-12
英文摘要	This study presents 13 new U-Pb zircon ages obtained by laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) together with whole-rock geochemical, Sr-Nd isotopic and zircon Hf isotopic data for a mafic dike swarm in the southern Qiangtang area of Tibet. These data provide the basis for a new model of the late Paleozoic evolution of the Tethys. Combined with the results of previous zircon U-Pb dating, the magmatic zircon grains extracted from mafic dikes yield latest Carboniferous to Early Permian ages (317-279 Ma). The geochemistry of the southern Qiangtang mafic rocks indicates the presence of low-Ti (QLT) and high-Ti (QHT) suites. The magmas that formed the QLT suite underwent higher degrees of partial melting ( > 5%) and display evidence of crustal contamination, whereas the QHT suite was derived from magmas generated by low-degree (1%-5%) partial melting of a garnet-bearing mantle source, with a greater extent of fractional crystallization than the QLT suite, and no evidence of crustal contamination. We propose that the QHT and QLT suites may have been derived from magmas from different parts of a single mantle plume. The formation of the southern Qiangtang mafic dikes (latest Carboniferous to Early Permian; 317-279 Ma) may have been related to the northward drift of the Cimmerian continent from the northern Gondwana margin, which resulted in the opening of the Meso-Tethys Ocean. © 2019 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184932
作者单位	College of Earth Sciences, Jilin University, Changchun, 130061, China; Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Land and Resources of China, Changchun, 130061, China; College of Earth Sciences, Jilin University, Changchun, 130061, China
推荐引用方式 GB/T 7714	Wang M.,Li C.,Zeng X.-W.,et al. Petrogenesis of the southern Qiangtang mafic dykes, Tibet: Link to a late Paleozoic mantle plume on the northern margin of Gondwana?[J],2019,131(2021-11-12).
APA	Wang M..,Li C..,Zeng X.-W..,Li H..,Fan J.-J..,...&Hao Y.-J..(2019).Petrogenesis of the southern Qiangtang mafic dykes, Tibet: Link to a late Paleozoic mantle plume on the northern margin of Gondwana?.Bulletin of the Geological Society of America,131(2021-11-12).
MLA	Wang M.,et al."Petrogenesis of the southern Qiangtang mafic dykes, Tibet: Link to a late Paleozoic mantle plume on the northern margin of Gondwana?".Bulletin of the Geological Society of America 131.2021-11-12(2019).