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Young ages from old garnet in the polyphase metamorphic terrane of the Limpopo Belt, South Africa
Zhou, Tian1,2,3; Li, Qiuli1,2,3; Li, Chaofeng1,2; Kroener, Alfred4
2020-06-15
Source PublicationPRECAMBRIAN RESEARCH
ISSN0301-9268
Volume342Pages:8
AbstractThe P-T-t path of high-grade metamorphic rocks is significant for understanding vertical motions and heating of the crust. In general, garnet is used to constrain P-T paths and metamorphic zircon is used to obtain t for different metamorphic stages. However, this approach may be complicated by polyphase tectonothermal events. The Central Zone of the Limpopo Belt in South Africa is a complex Precambrian metamorphic terrane that has experienced three distinct high-grade metamorphic events at 3.22 Ga (M-1), 2.62 Ga (M-2), and 2.02 Ga (M-3), based on zircon dating. A previous investigation of a metapelite enclave in the Bulai pluton in the Central Zone showed that metamorphic zircon in the enclave recorded mainly M-2 granulite-facies metamorphism and was "protected" by the Bulai pluton. However, titanite and rutile U-Pb ages of the same sample record the M-3 event. Here we investigated garnet Sm-Nd isotopic systematics of four metapelite samples from the Evelyn enclave in the Bulai pluton. We constructed single mineral Sm-Nd isochrons for garnet using micro-samples, in order to avoid the risk of isotopic disequilibrium between different minerals or whole-rocks. Metamorphic zircon with sillimanite inclusions has yielded a granulite-facies metamorphic age of ca. 2.6 Ga. However, the Sm-Nd isotopic data for the garnet record much younger ages of ca. 2.03 Ga. These ages are consistent with the M-3 event in this area, but were rarely identified in previous zircon dating studies. This suggests that the M-3 event reached sufficiently high temperatures to totally reset the rutile and titanite U-Pb and garnet Sm-Nd systems. Moreover, the decoupling of the age of garnet formation and the date it records needs to be carefully considered when reconstructing P-T-t paths, and again highlights the usefulness of garnet in the study of polyphase metamorphic terranes.
KeywordGarnet Sm-Nd isochron P-T-t path Limpopo belt Polyphase metamorphism
DOI10.1016/j.precamres.2020.105695
Funding OrganizationNational Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Program for Support of Top-Notch Young Professionals ; National Program for Support of Top-Notch Young Professionals ; National Program for Support of Top-Notch Young Professionals ; National Program for Support of Top-Notch Young Professionals ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Program for Support of Top-Notch Young Professionals ; National Program for Support of Top-Notch Young Professionals ; National Program for Support of Top-Notch Young Professionals ; National Program for Support of Top-Notch Young Professionals ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Program for Support of Top-Notch Young Professionals ; National Program for Support of Top-Notch Young Professionals ; National Program for Support of Top-Notch Young Professionals ; National Program for Support of Top-Notch Young Professionals ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Program for Support of Top-Notch Young Professionals ; National Program for Support of Top-Notch Young Professionals ; National Program for Support of Top-Notch Young Professionals ; National Program for Support of Top-Notch Young Professionals
WOS KeywordSM-ND ; CENTRAL ZONE ; U-PB ; RB-SR ; LU-HF ; GEOCHRONOLOGICAL EVIDENCE ; ISOTOPE ANALYSIS ; CENTRAL CHINA ; SHEAR ZONES ; MOBILE BELT
Language英语
Funding ProjectNational Key Research and Development Program of China[2016YFE0203000] ; National Natural Science Foundation of China[41773044] ; National Natural Science Foundation of China[41673059] ; National Program for Support of Top-Notch Young Professionals
Funding OrganizationNational Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Program for Support of Top-Notch Young Professionals ; National Program for Support of Top-Notch Young Professionals ; National Program for Support of Top-Notch Young Professionals ; National Program for Support of Top-Notch Young Professionals ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Program for Support of Top-Notch Young Professionals ; National Program for Support of Top-Notch Young Professionals ; National Program for Support of Top-Notch Young Professionals ; National Program for Support of Top-Notch Young Professionals ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Program for Support of Top-Notch Young Professionals ; National Program for Support of Top-Notch Young Professionals ; National Program for Support of Top-Notch Young Professionals ; National Program for Support of Top-Notch Young Professionals ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Program for Support of Top-Notch Young Professionals ; National Program for Support of Top-Notch Young Professionals ; National Program for Support of Top-Notch Young Professionals ; National Program for Support of Top-Notch Young Professionals
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000528208200033
PublisherELSEVIER
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/96233
Collection岩石圈演化国家重点实验室
Corresponding AuthorLi, Qiuli
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
4.Johannes Gutenberg Univ Mainz, Inst Geosci, D-55099 Mainz, Germany
First Author AffilicationState Key Laboratory of Lithospheric Evolution
Corresponding Author AffilicationState Key Laboratory of Lithospheric Evolution
Recommended Citation
GB/T 7714
Zhou, Tian,Li, Qiuli,Li, Chaofeng,et al. Young ages from old garnet in the polyphase metamorphic terrane of the Limpopo Belt, South Africa[J]. PRECAMBRIAN RESEARCH,2020,342:8.
APA Zhou, Tian,Li, Qiuli,Li, Chaofeng,&Kroener, Alfred.(2020).Young ages from old garnet in the polyphase metamorphic terrane of the Limpopo Belt, South Africa.PRECAMBRIAN RESEARCH,342,8.
MLA Zhou, Tian,et al."Young ages from old garnet in the polyphase metamorphic terrane of the Limpopo Belt, South Africa".PRECAMBRIAN RESEARCH 342(2020):8.
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