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Emplacement and metamorphism of the mafic rocks from the Chencai terrane within the Cathaysia Block: Implications for the Paleozoic orogenesis of the South China Block
Zhao, Lei1,2; Cui, Xiahong1,3; Zhai, Mingguo1,4; Zhou, Xiwen5; Liu, Bo1
2019-04-15
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
Volume173Pages:11-28
AbstractUnderstanding the Early Paleozoic tectonic evolution of the South China Block (SCB) is critical in constraining its relationship with (super-) continent configurations, such as the Rodinia and Gondwana. High-grade mafic and supracrustal rocks occurring in the Chencai terrane of the Cathaysia Block are the uplifted lower crustal components of the Kwangsian (Early Paleozoic) Orogen which extensively reshaped many parts of the SCB. Two amphibolites, three biotite-bearing amphibolites, one norite and one mafic granulite were collected from the Chencai terrane. In previous studies, these rocks (or their protoliths) have been suggested to belong to the same cumulate series and the mafic granulite records metamorphic P-T conditions of a high-geothermal-gradient environment (similar to 30 degrees C/km). Our SIMS zircon U-Pb results indicate that protoliths of these meta-mafic rocks were emplaced at similar to 434-445 Ma and most of them have experienced subsequent (almost synchronous) metamorphism at 428-439 Ma. The norite sample (434 Ma), which experienced the least crustal contamination and the least metamorphic alteration, has the lowest zircon delta O-18 values of similar to+ 6.7 parts per thousand (V-SMOW), whereas the mafic granulite which experienced the highest grade metamorphism has the highest zircon delta O-18 values of similar to+9.4 parts per thousand (V-SMOW). Zircon delta O-18 values of other samples mostly scatter between them. Most metamorphic zircons have younger U-Pb ages and higher delta O-18 values than magmatic zircons. High delta O-18 crustal materials (e.g. sedimentary rocks) have possibly been involved during the metamorphism which resulted in the contrasting delta O-18 values of magmatic and metamorphic zircons. The large variations in delta O-18 values shown by magmatic zircons of each sample (like the amphibolite and biotite-bearing amphibolite) indicate that the high-delta O-18-value crustal materials (sedimentary rocks) must have started to affect these mafic rocks since the magmatic stage. Zircon 178 (Hf)/177(Hf) values of each of these samples scatter within small ranges. Initial epsilon(Hf)(t) values of most zircons fall in between the CHUR line and the DM linear model line, indicating that these mafic rocks were derived from an enriched mantle source. Combined with previous geochronological, metamorphic and geochemical data, we propose that these Paleozoic mafic magmatism might have contributed thermal energy to the later thermal relaxation of the orogeny. This episode of mafic magmatism may represent a transition of the Kwangsian Orogen from early compression to post-orogenic extension. Metamorphism of these mafic rocks and the synchronous anatexis indicated by the high grade supracrustal rocks from Chencai terrane, might be related with extension rather than orogenic compression.
KeywordSIMS zircon U-Pb geochronology Zircon Lu-Hf and O isotopes Lower-crustal components South China Paleozoic orogen Cathaysia Block
DOI10.1016/j.jseaes.2019.01.019
Funding OrganizationNational Nature Science Foundation of China ; National Nature Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; China Scholarship Council ; China Scholarship Council
WOS KeywordU-PB GEOCHRONOLOGY ; WUYI-YUNKAI OROGEN ; HF ISOTOPES ; LU-HF ; TECTONOTHERMAL EVENT ; ZIRCON GEOCHRONOLOGY ; CRUSTAL ANATEXIS ; FACIES ZIRCONS ; O ISOTOPES ; GEOCHEMISTRY
Language英语
Funding ProjectNational Nature Science Foundation of China[41872197] ; National Nature Science Foundation of China[41502182] ; National Nature Science Foundation of China[41530208] ; China Scholarship Council[201604910053]
Funding OrganizationNational Nature Science Foundation of China ; National Nature Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; China Scholarship Council ; China Scholarship Council
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000466059800002
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/91493
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 Wollongong, Sch Earth Atmospher & Life Sci, GeoQuEST Res Ctr, Wollongong, NSW 2522, Australia
3.Hebei GEO Univ, Shijiazhuang 050031, Hebei, Peoples R China
4.Univ Chinese Acad Sci, Key Lab Computat Geodynam, Beijing 100049, Peoples R China
5.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
Recommended Citation
GB/T 7714
Zhao, Lei,Cui, Xiahong,Zhai, Mingguo,et al. Emplacement and metamorphism of the mafic rocks from the Chencai terrane within the Cathaysia Block: Implications for the Paleozoic orogenesis of the South China Block[J]. JOURNAL OF ASIAN EARTH SCIENCES,2019,173:11-28.
APA Zhao, Lei,Cui, Xiahong,Zhai, Mingguo,Zhou, Xiwen,&Liu, Bo.(2019).Emplacement and metamorphism of the mafic rocks from the Chencai terrane within the Cathaysia Block: Implications for the Paleozoic orogenesis of the South China Block.JOURNAL OF ASIAN EARTH SCIENCES,173,11-28.
MLA Zhao, Lei,et al."Emplacement and metamorphism of the mafic rocks from the Chencai terrane within the Cathaysia Block: Implications for the Paleozoic orogenesis of the South China Block".JOURNAL OF ASIAN EARTH SCIENCES 173(2019):11-28.
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