Improving geochronological framework of the Pan-African orogeny in Cameroon: New SIMS zircon and monazite U-Pb age constraints
文献类型：期刊论文
| 作者 | Li, Xian-Hua1,2; Chen, Yi1; Tchouankoue, Jean Pierre3; Liu, Chuan-Zhou1,4; Li, Jiao1; Ling, Xiao-Xiao1; Tang, Guo-Qiang1,2; Liu, Yu1,2 |
| 刊名 | PRECAMBRIAN RESEARCH
 |
| 出版日期 | 2017-06-01 |
| 卷号 | 294页码:307-321 |
| 关键词 | Sims Zircon And Monazite U-pb Age Hf And o Isotopes Granulite Facies Metamorphism Granite Neoproterozoic Fold Belt Of Cameroon Pan-african Orogeny |
| ISSN号 | 0301-9268 |
| DOI | 10.1016/j.precamres.2017.04.006 |
| 文献子类 | Article |
| 英文摘要 | High-precision geochronological framework is crucial to understanding of the evolution of orogenesis. As part of the Pan-African North Equatorial Fold Belt, the Neoproterozoic Fold Belt of Cameroon (NFBC) involved polyphase deformation (D1 to D4 phases), metamorphism (up to granulite facies) and widespread crustal anatexis and magmatism. While a general geochronological framework has been established, controversy still exists on the temporal evolution of the metamorphic and magmatic events associated with polyphase deformation, in particular, the accurate age and geodynamic manifestations underlining the end of the orogeny are yet to be well constrained. We conduct in this work integrated analyses of SIMS U-Pb zircon and monazite dating and in-situ zircon Hf-O isotopes on the orthogneiss, leucosome and granite samples from Wum and Yaounde of southwestern Cameroon in order to provide further constraints on temporal evolution of the NFBC. Our high-precision SIMS U-Pb age data demonstrate that the magmatic protoliths of orthogneisses from Wum and Yaounde were emplaced synchronously at ca. 620 Ma. They were generated by partial melting of the thickened Paleoproterozoic crustal basement rocks with zircon Hf T-DM(c) model age of ca. 1.9-2.0 Ga. Metamorphic zircons and two generations of monazites from an in-situ leucosome within the granulitic paragneiss of the Yaounde Group yield indistinguishable ages of ca. 610 Ma. These new results, in combination with previous isotopic data, suggest that the Yaounde Group supracrustal rocks with zircon Hf T-DM(c) model age of ca. 1.7 Ga experienced a very rapid evolution from sedimentation at < 626 Ma, burial to deformation and granulite facies metamorphism at ca. 610 Ma. The deformed two-mica granite and undeformed biotite granite in Wum were precisely dated at 561 +/- 3 Ma and 557 +/- 4 Ma, respectively. They both were derived from similar supracrustal sources with zircon Hf T-DM(c) model age of ca. 2.56-2.40 Ga. On the basis of our new SIMS U-Pb ages, along with existing dates from the literature, an improved geochronological framework is proposed for the NFBC, with ages of >= 620 Ma, ca. 620-600 Ma, ca. 590-580 Ma, and ca. 580-560 Ma for the D1, D2, D3, and D4 phase events, respectively. (C) 2017 Elsevier B.V. All rights reserved. |
| WOS关键词 | HF-O ISOTOPES ; NORTH-CENTRAL CAMEROON ; MC-ICP-MS ; FOLD BELT ; SOUTHERN CAMEROON ; WEST-CAMEROON ; SE CHINA ; LU-HF ; METAMORPHIC EVENTS ; WORKING REFERENCE |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000402217500017 |
| 出版者 | ELSEVIER SCIENCE BV |
| 资助机构 | Chinese Academy of Sciences(XDB18030300 ; Chinese Academy of Sciences(XDB18030300 ; QYZDY-SSW-DQC017) ; QYZDY-SSW-DQC017) ; Chinese Academy of Sciences(XDB18030300 ; Chinese Academy of Sciences(XDB18030300 ; QYZDY-SSW-DQC017) ; QYZDY-SSW-DQC017) ; Chinese Academy of Sciences(XDB18030300 ; Chinese Academy of Sciences(XDB18030300 ; QYZDY-SSW-DQC017) ; QYZDY-SSW-DQC017) ; Chinese Academy of Sciences(XDB18030300 ; Chinese Academy of Sciences(XDB18030300 ; QYZDY-SSW-DQC017) ; QYZDY-SSW-DQC017) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/52867]  |
| 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, Xian-Hua |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China 3.Univ Yaounde I, Dept Earth Sci, POB 812, Yaounde, Cameroon 4.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Xian-Hua,Chen, Yi,Tchouankoue, Jean Pierre,et al. Improving geochronological framework of the Pan-African orogeny in Cameroon: New SIMS zircon and monazite U-Pb age constraints[J]. PRECAMBRIAN RESEARCH,2017,294:307-321. |
| APA | Li, Xian-Hua.,Chen, Yi.,Tchouankoue, Jean Pierre.,Liu, Chuan-Zhou.,Li, Jiao.,...&Liu, Yu.(2017).Improving geochronological framework of the Pan-African orogeny in Cameroon: New SIMS zircon and monazite U-Pb age constraints.PRECAMBRIAN RESEARCH,294,307-321. |
| MLA | Li, Xian-Hua,et al."Improving geochronological framework of the Pan-African orogeny in Cameroon: New SIMS zircon and monazite U-Pb age constraints".PRECAMBRIAN RESEARCH 294(2017):307-321. |
入库方式： OAI收割
来源：地质与地球物理研究所
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