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Major lithologies of the high-grade Zhoutan terrane within the Cathaysia Block and their tectonic implications for the Neoproterozoic - Paleozoic South China
Zhao, Lei1; Zhang, Ru-cheng1,2; Zhai, Ming-Guo1,2; Zhou, Xi-Wen3
2020-11-01
Source PublicationLITHOS
ISSN0024-4937
Volume372Pages:21
AbstractPre-Devonian crystalline basement of the Cathaysia Block was united through the Wuyi-Yunkai orogeny. The uplifted orogenic core is dominantly composed of Paleozoic high-grade terranes occurring in a northeast-southwest trending belt. The Zhoutan terrane in the middle part of this belt is one of the key terranes to reveal the tectonic architecture of the South China Block. However, how to correlate it with other high-grade terranes, what kind of rock records are preserved in this terrane and their tectonic implications for the Wuyi-Yunkai orogen are still unresolved. This paper carries out an integrated study on the petrology, zircon U-Pb geochronology, geochemistry and zircon Lu-Hf isotopic compositions of the main rock types in the Zhoutan terrane, with a purpose of better understanding the Wuyi-Yunkai orogeny. Mafic granulite (noritic) of high-T and low-P conditions occurs as lenses within the Zhoutan Formation. The zircon U-Pb geochronological data give magmatic and metamorphic ages of 460-450 Ma and - 430 Ma, respectively. Neoproterozoic and Paleoproterozoic (1.89 Ga) xenoaysts also occur. Meta-pelites of the Zhoutan Formation experienced high T/P amphibolite facies metamorphism. and ages of their detrital zircons are dominantly Neoproterozoic (810-820 Ma) with some subordinate Paleo- to Mesoproterozoic and Archean signatures. Amphibole gneiss layers of this formation give a Paleozoic metamorphic age of -450 Ma. consistent with the high-P amphibolite facies metamorphism of the neighboring Longyou terrane. Fine-grained garnet mica-schist of the Wanyuan Formation consists of greenschist to amphibolite facies mineral assemblage and detrital zircons of these meta-sediments display both Neoproterozoic and early Precambrian ages at similar to 770 Ma, similar to 820 Ma, similar to 850 Ma, similar to 1.84 Ga and similar to 2.48 Ga. Metamorphosed calc-silicates of the Wanyuan Formation show similar detrital zircon age peaks of 624 Ma, 780-790 Ma, similar to 810 Ma, 840-850 Ma, 1.8-1.98 Ga and similar to 2.48 Ga, and a Paleozoic metamorphic age of similar to 447 Ma. The Cizhu pluton is a composite granitoid body intruding the Zhoutan and Wanyuan formations, with emplacement ages ranging at least from 485 Ma to 446 Ma. epsilon(Hf)(t) values of zircons from the mafic granulite range from -10.9 to -8.5, indicating its protolith derived from enriched mantle sources with or without crustal contaminations. The Cizhu magmatic event is a crustal reworking event as indicated by the coherently negative zircon epsilon(Hf)(t) values and ancient Hf crustal model ages of 1530-1830 Ma. Zircon epsilon(Hf)(t) values of the metamorphosed talc-silicates show large variations, ranging from -21.2 to +11, consistent with its complex provenances. The deposition of the sedimentary rocks of the Zhoutan and Wanyuan formations is consistent with the development of the Neoproterozoic-Paleozoic Nanhua Rift. The development of continental margin sequences like the Zhoutan and Wanyuan formations, the evolution of the Paleozoic metamorphism from early higher PIT metamorphic stage to later lower Pa stage, as well as the generation of the Paleozoic mafic-ultramafic rocks and the intermediate Cizhu pluton, are best explained by collision to post-collision settings. We, therefore, conclude that the Zhuotan terrane (as well as other high-grade terranes) witnessed a whole geological cycle, from early rifting to the dosure of a rifted basin (Nanhua Basin), and the final lithospheric delamination following the rejoining of continental blocks flanking the rift. (C) 2020 Elsevier B.V. All rights reserved.
KeywordMeta-pelites Mafic granulite Paleozoic high-grade terrane Cathaysia Block South China
DOI10.1016/j.lithos.2020.105664
Funding OrganizationNational Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Research Foundation of Korea ; National Research Foundation of Korea ; National Research Foundation of Korea ; National Research Foundation of Korea ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Research Foundation of Korea ; National Research Foundation of Korea ; National Research Foundation of Korea ; National Research Foundation of Korea ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Research Foundation of Korea ; National Research Foundation of Korea ; National Research Foundation of Korea ; National Research Foundation of Korea ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Research Foundation of Korea ; National Research Foundation of Korea ; National Research Foundation of Korea ; National Research Foundation of Korea
WOS KeywordU-PB GEOCHRONOLOGY ; MESOZOIC OVERTHRUST TECTONICS ; WILSON CYCLE MODEL ; WUYI-YUNKAI OROGEN ; ND-HF ISOTOPES ; LU-HF ; JIANGNAN OROGEN ; TRACE-ELEMENT ; METASEDIMENTARY ROCKS ; TECTONOTHERMAL EVENT
Language英语
Funding ProjectNational Nature Science Foundation of China[41872197] ; National Nature Science Foundation of China[41530208] ; National Nature Science Foundation of China[41890832] ; National Nature Science Foundation of China[41890834] ; National Research Foundation of Korea[2017K1A1A2013180]
Funding OrganizationNational Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Research Foundation of Korea ; National Research Foundation of Korea ; National Research Foundation of Korea ; National Research Foundation of Korea ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Research Foundation of Korea ; National Research Foundation of Korea ; National Research Foundation of Korea ; National Research Foundation of Korea ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Research Foundation of Korea ; National Research Foundation of Korea ; National Research Foundation of Korea ; National Research Foundation of Korea ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Research Foundation of Korea ; National Research Foundation of Korea ; National Research Foundation of Korea ; National Research Foundation of Korea
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000571822300013
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/98268
Collection岩石圈演化国家重点实验室
Corresponding AuthorZhao, Lei
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, 19 Beituchengxi Rd, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
First Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhao, Lei,Zhang, Ru-cheng,Zhai, Ming-Guo,et al. Major lithologies of the high-grade Zhoutan terrane within the Cathaysia Block and their tectonic implications for the Neoproterozoic - Paleozoic South China[J]. LITHOS,2020,372:21.
APA Zhao, Lei,Zhang, Ru-cheng,Zhai, Ming-Guo,&Zhou, Xi-Wen.(2020).Major lithologies of the high-grade Zhoutan terrane within the Cathaysia Block and their tectonic implications for the Neoproterozoic - Paleozoic South China.LITHOS,372,21.
MLA Zhao, Lei,et al."Major lithologies of the high-grade Zhoutan terrane within the Cathaysia Block and their tectonic implications for the Neoproterozoic - Paleozoic South China".LITHOS 372(2020):21.
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