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New evidence for a continental rift tectonic setting of the Neoproterozoic Imorona-Itsindro Suite (central Madagascar)

文献类型：期刊论文

作者Zhou, Jiu-Long1,2; Li, Xian-Hua1,2,3; Tang, Guo-Qiang1,3; Liu, Yu1,3; Tucker, Robert D.4
刊名PRECAMBRIAN RESEARCH
出版日期2018-03-01
卷号306页码:94-111
关键词Neoproterozoic tectonics Rodinia break-up Continental arc magmatism Continental rift magmatism Zircon Hf-O isotopes East African-Antarctic Orogen
ISSN号0301-9268
DOI10.1016/j.precamres.2017.12.029
文献子类Article
英文摘要The Neoproterozoic Imorona-Itsindro Suite of central Madagascar represents one of the crucial petrological records of the supercontinent transformation from Rodinia into Gondwana, whereas its tectonic setting remains open to debate. Here newly reported and existing zircon U/Pb-Hf-O isotope data are used to better understand the tempo-spatial features and petrogenetic mechanisms of this enigmatic suite. The following results are at least more compatible with, if not suggestive of, a continental rift setting than the traditionally accepted continental arc setting. (1) This suite is present throughout central Madagascar, including the Manampotsy-Anaboriana Domain and probably also the Antongil Sub-domain. Particularly, the high-flux magmatic pulse at similar to 790 Ma has a width of more than 300 km. (2) This suite is in essence an igneous expression of lithospheric reworking with no asthenosphere contribution being clearly detected. (3) The felsic and mafic end-members of this suite have independent sources and were derived from the crustal basement and lithospheric mantle, respectively. (4) Input of mantle materials (via magma mixing process) into the crust-derived felsic end-member increased at the similar to 790 Ma high-flux period, as indicated by a discernible positive zircon epsilon(Hf)(t) excursion. (5) Felsic end-member magma systems may have interacted with meteoric water at a high temperature, as implied by a previously reported zircon low-delta O-18 signature. Thus, there is perhaps no Neoproterozoic Mozambique Ocean suture across the Archean basement of central Madagascar. The most important implication of this study is that an elongate Andean-type orogenic system assumed in many Neoproterozoic paleogeography maps may not have been developed along the western margin of the supercontinent Rodinia.
WOS关键词U-PB AGE ; NORTH-CENTRAL MADAGASCAR ; WEST-CENTRAL MADAGASCAR ; HF ISOTOPIC COMPOSITION ; SOUTH CHINA BLOCK ; BETSIMISARAKA SUTURE ; STRATOID GRANITES ; ZIRCON MEGACRYSTS ; O ISOTOPES ; GONDWANA CONNECTIONS
WOS研究方向Geology
语种英语
WOS记录号WOS:000425204600006
出版者ELSEVIER SCIENCE BV
资助机构Chinese Academy of Sciences(XDB18030300) ; Chinese Academy of Sciences(XDB18030300) ; Chinese Academy of Sciences(XDB18030300) ; Chinese Academy of Sciences(XDB18030300) ; Chinese Academy of Sciences(XDB18030300) ; Chinese Academy of Sciences(XDB18030300) ; Chinese Academy of Sciences(XDB18030300) ; Chinese Academy of Sciences(XDB18030300) ; National Natural Science Foundation of China(41703040) ; National Natural Science Foundation of China(41703040) ; National Natural Science Foundation of China(41703040) ; National Natural Science Foundation of China(41703040) ; National Natural Science Foundation of China(41703040) ; National Natural Science Foundation of China(41703040) ; National Natural Science Foundation of China(41703040) ; National Natural Science Foundation of China(41703040) ; Ministry of Science and Technology of China(2016YFE0203000) ; Ministry of Science and Technology of China(2016YFE0203000) ; Ministry of Science and Technology of China(2016YFE0203000) ; Ministry of Science and Technology of China(2016YFE0203000) ; 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源URL[http://ir.iggcas.ac.cn/handle/132A11/82768]  
专题中国科学院地质与地球物理研究所
通讯作者Li, Xian-Hua
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China
4.Bur Rech Geol & Minieres, 3 Ave C Guillemin,BP 6009, F-45060 Orleans 2, France
推荐引用方式
GB/T 7714		 Zhou, Jiu-Long,Li, Xian-Hua,Tang, Guo-Qiang,et al. New evidence for a continental rift tectonic setting of the Neoproterozoic Imorona-Itsindro Suite (central Madagascar)[J]. PRECAMBRIAN RESEARCH,2018,306:94-111.
APA Zhou, Jiu-Long,Li, Xian-Hua,Tang, Guo-Qiang,Liu, Yu,&Tucker, Robert D..(2018).New evidence for a continental rift tectonic setting of the Neoproterozoic Imorona-Itsindro Suite (central Madagascar).PRECAMBRIAN RESEARCH,306,94-111.
MLA Zhou, Jiu-Long,et al."New evidence for a continental rift tectonic setting of the Neoproterozoic Imorona-Itsindro Suite (central Madagascar)".PRECAMBRIAN RESEARCH 306(2018):94-111.

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来源：地质与地球物理研究所

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