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  4. 岩石圈演化国家重点实验室
Early Neoproterozoic assembly of the Yangtze Block decoded from metasedimentary rocks of the Miaowan Complex

文献类型：期刊论文

作者Lu, Kai5,6,7; Li, Xian-Hua5,6,7; Zhou, Jiu-Long1; Peng, Song-Bai3,4; Deng, Hao3,4; Guo, Shun2,7; Yang, Chuan7; Wu, Li-Guang5,6,7
刊名PRECAMBRIAN RESEARCH
出版日期2020-08-15
卷号346页码:15
ISSN号0301-9268
关键词Neoproterozoic Continental assembly Miaowan Complex Detrital zircons South China
DOI10.1016/j.precamres.2020.105787
英文摘要The present Yangtze Block was proposed to be formed as a unified block in the Mesoproterozoic-Neoproterozoic transition, but the detailed timing and process are poorly constrained. Here we report integrated in situ U-Pb and Hf-O isotopic analyses of detrital zircons from the Xiaoxikou metamorphosed sedimentary rocks of the Miaowan Complex in the Yangtze Block, as well as U-Th-Pb and Nd-O isotopic analyses of magmatic monazites from an undeformed and unmetamorphosed leucocratic vein intruding these metasedimentary rocks. U-Pb dating results for detrital zircons from the metasedimentary rocks display two main age peaks at ca 970 and 900 Ma. The 970 Ma zircons are dominantly characterized by mantle-like delta O-18(zi)r values (4.5-5.8 parts per thousand) and highly depleted epsilon(Hf)(t) values (+ 5 to + 14). The 900 Ma zircons mostly have O and Hf isotopic features similar to the 970 Ma zircons, except relative small proportion of grains with high delta O-18 values (6.0-9.2 parts per thousand) and variable epsilon(Hf)(t) values (-33 to + 7). Monazites from the vein are dated at ca 850 Ma and have uniform delta O-18 values (5.4-6.6 parts per thousand), but significantly enriched epsilon(Nd)(t) values (-14.5 to -12.6). Based on the new isotopic results and immature lithology, the Xiaoxikou metasedimentary rocks are interpreted to be deposited between 900 and 850 Ma in a fore-arc basin, and clastic materials derived from ca 970-900 Ma arc rocks were related to the northward subduction (present-day coordinates) of the Miaowan oceanic plate. The 850 Ma leucocratic vein shows geological and isotopic characteristics consistent with local 860-840 Ma post-tectonic granitic plutons, and may represent a fractionated product of local coeval granitic magmas. We propose that the closure of the Miaowan oceanic basin and formation of the current unified Yangtze Block occurred between 900 and 860 Ma, i.e., later than the deposition of the fore-arc metasedimentary rocks while earlier than the emplacement of the post-tectonic plutons.
WOS关键词U-PB GEOCHRONOLOGY ; NATURAL REFERENCE MATERIAL ; HF ISOTOPE COMPOSITION ; A-TYPE GRANITE ; SOUTH CHINA ; TH-PB ; SW CHINA ; GEOCHEMICAL EVIDENCE ; ZIRCON MEGACRYSTS ; CRUSTAL EVOLUTION
资助项目Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB18030300] ; National Natural Science Foundation of China[41673018]
WOS研究方向Geology
语种英语
出版者ELSEVIER
WOS记录号WOS:000561242000009
资助机构Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/97663]  
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Li, Xian-Hua
作者单位1.Nanjing Univ, Sch Earth Sci & Engn, Nanjing 210023, Peoples R China
2.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
3.China Univ Geosci, Three Gorges Ctr Geohazards Res, Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
4.China Univ Geosci, Ctr Global Tecton, Sch Earth Sci, Wuhan 430074, Peoples R China
5.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
6.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
7.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Lu, Kai,Li, Xian-Hua,Zhou, Jiu-Long,et al. Early Neoproterozoic assembly of the Yangtze Block decoded from metasedimentary rocks of the Miaowan Complex[J]. PRECAMBRIAN RESEARCH,2020,346:15.
APA Lu, Kai.,Li, Xian-Hua.,Zhou, Jiu-Long.,Peng, Song-Bai.,Deng, Hao.,...&Wu, Li-Guang.(2020).Early Neoproterozoic assembly of the Yangtze Block decoded from metasedimentary rocks of the Miaowan Complex.PRECAMBRIAN RESEARCH,346,15.
MLA Lu, Kai,et al."Early Neoproterozoic assembly of the Yangtze Block decoded from metasedimentary rocks of the Miaowan Complex".PRECAMBRIAN RESEARCH 346(2020):15.

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来源：地质与地球物理研究所

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