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Tectonic regime transition of the western South China Block in early Cambrian: Evidence from the Meishucun volcanic ash beds

文献类型：期刊论文

作者Yang, Chuan1,2,3; Li, Xian-Hua3,4; Zhu, Mao-Yan1,2,4
刊名PALAEOWORLD
出版日期2022-12-01
卷号31期号:4页码:591-599
关键词Meishucun Volcanic ash South China Gondwana Paleo-Tethys Ocean
ISSN号1871-174X
DOI10.1016/j.palwor.2022.03.003
英文摘要The tectonic evolution of the South China Block, especially its western part, is ambiguous in the early Paleozoic owing to the lack of contemporary tectono-magmatic records. Thick ash beds preserved in the early Cambrian successions in the eastern Yunnan Province of the western South China Block provide new insights into their magmatic origins and tectonic evolution. We report here integrated in-situ zircon U-Pb data, Hf-O isotopes, and whole-rock geochemistry of two early Cambrian ash beds (Bed 5 and Bed 9) from the Meishucun section in the eastern Yunnan Province. SIMS zircon U-Pb data indicate the two ash layers were deposited at 533.2 +/- 3.8 Ma and 526.2 +/- 4.1 Ma, respectively. Zircon Hf-O isotopes and whole-rock geochemistry of the two ash beds demonstrate crustal origins of their parental magma and their close affinities to A-type granites. These features suggest that the ash beds were formed in extensional settings and the tectonic regime of the study area switched from compression to extension in the early Cambrian. The Meishucun volcanic records, in combination with other late Ediacaran-early Paleozoic magmatism along the northern margin of East Gondwana, may represent the initial opening phase of the Paleo-Tethys Ocean. (c) 2022 Elsevier B.V. and Nanjing Institute of Geology and Palaeontology, CAS. All rights reserved.
WOS关键词MAGMATIC FLARE-UP ; CARBON-ISOTOPE ; TUFF LAYER ; ZIRCON AGE ; PB AGES ; CONSTRAINTS ; YANGTZE ; YUNNAN ; GONDWANA ; OCEAN
资助项目National Natural Science Foundation of China[41802029] ; National Natural Science Foundation of China[41921002] ; State Key Laboratory of Palaeobiology and Stratigraphy[203121]
WOS研究方向Paleontology
语种英语
WOS记录号WOS:000880139000004
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Palaeobiology and Stratigraphy ; State Key Laboratory of Palaeobiology and Stratigraphy ; State Key Laboratory of Palaeobiology and Stratigraphy ; State Key Laboratory of Palaeobiology and Stratigraphy ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Palaeobiology and Stratigraphy ; State Key Laboratory of Palaeobiology and Stratigraphy ; State Key Laboratory of Palaeobiology and Stratigraphy ; State Key Laboratory of Palaeobiology and Stratigraphy ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Palaeobiology and Stratigraphy ; State Key Laboratory of Palaeobiology and Stratigraphy ; State Key Laboratory of Palaeobiology and Stratigraphy ; State Key Laboratory of Palaeobiology and Stratigraphy ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Palaeobiology and Stratigraphy ; State Key Laboratory of Palaeobiology and Stratigraphy ; State Key Laboratory of Palaeobiology and Stratigraphy ; State Key Laboratory of Palaeobiology and Stratigraphy
源URL[http://ir.iggcas.ac.cn/handle/132A11/107705]  
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Yang, Chuan
作者单位1.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
4.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Yang, Chuan,Li, Xian-Hua,Zhu, Mao-Yan. Tectonic regime transition of the western South China Block in early Cambrian: Evidence from the Meishucun volcanic ash beds[J]. PALAEOWORLD,2022,31(4):591-599.
APA Yang, Chuan,Li, Xian-Hua,&Zhu, Mao-Yan.(2022).Tectonic regime transition of the western South China Block in early Cambrian: Evidence from the Meishucun volcanic ash beds.PALAEOWORLD,31(4),591-599.
MLA Yang, Chuan,et al."Tectonic regime transition of the western South China Block in early Cambrian: Evidence from the Meishucun volcanic ash beds".PALAEOWORLD 31.4(2022):591-599.

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来源：地质与地球物理研究所

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