中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 地质与地球物理研究所
  3. 中国科学院地质与地球物理研究所
  4. 岩石圈演化国家重点实验室
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

文献类型：期刊论文

作者Zhao, Lei1,2; Cui, Xiahong1,3; Zhai, Mingguo1,4; Zhou, Xiwen5; Liu, Bo1
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2019-04-15
卷号173页码:11-28
关键词SIMS zircon U-Pb geochronology Zircon Lu-Hf and O isotopes Lower-crustal components South China Paleozoic orogen Cathaysia Block
ISSN号1367-9120
DOI10.1016/j.jseaes.2019.01.019
英文摘要Understanding 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.
WOS关键词U-PB GEOCHRONOLOGY ; WUYI-YUNKAI OROGEN ; HF ISOTOPES ; LU-HF ; TECTONOTHERMAL EVENT ; ZIRCON GEOCHRONOLOGY ; CRUSTAL ANATEXIS ; FACIES ZIRCONS ; O ISOTOPES ; GEOCHEMISTRY
资助项目National Nature Science Foundation of China[41872197] ; National Nature Science Foundation of China[41502182] ; National Nature Science Foundation of China[41530208] ; China Scholarship Council[201604910053]
WOS研究方向Geology
语种英语
WOS记录号WOS:000466059800002
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council
源URL[http://ir.iggcas.ac.cn/handle/132A11/91493]  
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Zhao, Lei
作者单位1.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
推荐引用方式
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.

入库方式： OAI收割

来源：地质与地球物理研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。