Young ages from old garnet in the polyphase metamorphic terrane of the Limpopo Belt, South Africa
文献类型：期刊论文
| 作者 | Zhou, Tian2,3,4; Li, Qiuli2,3,4; Li, Chaofeng3,4; Kroener, Alfred1 |
| 刊名 | PRECAMBRIAN RESEARCH
 |
| 出版日期 | 2020-06-15 |
| 卷号 | 342页码:8 |
| 关键词 | Garnet Sm-Nd isochron P-T-t path Limpopo belt Polyphase metamorphism |
| ISSN号 | 0301-9268 |
| DOI | 10.1016/j.precamres.2020.105695 |
| 英文摘要 | The 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. |
| WOS关键词 | SM-ND ; CENTRAL ZONE ; U-PB ; RB-SR ; LU-HF ; GEOCHRONOLOGICAL EVIDENCE ; ISOTOPE ANALYSIS ; CENTRAL CHINA ; SHEAR ZONES ; MOBILE BELT |
| 资助项目 | National 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 |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000528208200033 |
| 出版者 | ELSEVIER |
| 资助机构 | 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 ; 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 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/96233]  |
| 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 | Li, Qiuli |
| 作者单位 | 1.Johannes Gutenberg Univ Mainz, Inst Geosci, D-55099 Mainz, Germany 2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：地质与地球物理研究所
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