Crustal architecture of the southern Tongbai orogen, central China: Insight from migmatites and post-collisional granites
文献类型：期刊论文
| 作者 | Zhang, Wen-Xiang2; Wu, Yuan-Bao2; Zhou, Guang-Yan2; He, Yu2; Liu, Xiao-Chi1 ; Hu, Pan2; Chang, Huan2; Liu, Cheng-Yi-Hong2
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| 刊名 | LITHOS
 |
| 出版日期 | 2021-12-01 |
| 卷号 | 404-405页码:17 |
| 关键词 | Migmatites Post-collisional granites Zircon U-Pb-Hf-O isotopes Crustal architecture Tongbai orogen |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2021.106439 |
| 英文摘要 | The crustal structure of collisional orogen is critical for deciphering the crustal evolution and geodynamics of an orogen. Metamorphic rocks and post-collisional magmatic rocks are the key subjects to probe the crustal structure. In this study, we conducted an integrated study of zircon U-Pb age, Hf and O isotopes for migmatites and post-collisional granites in the southern segment of the Tongbai orogen. Zircon U-Pb dating yields protolith ages of 755 +/- 55 to 713 +/- 6 Ma and metamorphic ages of 162 +/- 11 Ma to 138 +/- 2 Ma for the migmatites and intrusion ages of 137 +/- 2 Ma for the post-collisional granites. The inherited magmatic cores in the migmatites exhibit similar Hf isotopic compositions to the metamorphic zircons. Their epsilon Hf(t) values range from 13.5 to -9.5 with crust Hf model ages of 787 Ma to 2233 Ma, indicating that the protoliths were derived from reworking of Paleoproterozoic crust with the addition of juvenile components during the Neoproterozoic. Zircon 818O of inherited magmatic cores are of -1.45%o to 5.90%o, signifying the protoliths were formed by remelting of hydrothermally altered low 818O rocks. By comparison, the post-collisional granites mostly show normal mantlelike O zircon isotope compositions and have lower epsilon Hf(t) and epsilon Nd(t) values than the migmatite rocks. These features suggest that the granites were formed by fusion of the ancient crust that might have suffered insufficient water-rock interaction. The discrepancies in O-Hf-Nd isotopic compositions of the studied migmatites and granites might be inherited from their precursors. It is thus inferred that the precursors of the granites might lie at the shoulder of the Neoproterozoic rift and thus might have experienced slight water-rock hydrothermal alteration and crust-mantle interaction; whereas the protoliths of the metamorphic rocks might be located at or near the rift center and thus had suffered intensive water-rock hydrothermal alteration and crust-mantle interaction. Prior to the late Mesozoic magmatism, the Tongbai orogen would have an uncoupled double-layered crust, where the upper layer consists of the metamorphic rocks and the lower is the sources of the post-collisional granites. They were stacked by the Permian-Triassic orogeny. The final architecture of the Tongbai orogen might be constituted by the emplacement of the voluminous granites from the deeper crust and the formation of the migmatites in the Tongbai complex. This configuration might widespread for other collisional orogens. |
| WOS关键词 | ZIRCON U-PB ; O-ISOTOPE EVIDENCE ; SUBDUCTED CONTINENTAL-CRUST ; ULTRAHIGH-PRESSURE ECLOGITE ; HF ISOTOPE ; TECTONIC EVOLUTION ; LU-HF ; MESOZOIC GRANITOIDS ; MANTLE INTERACTION ; METAMORPHIC ROCKS |
| 资助项目 | National Natural Science Foundation of China[41625008] ; National Natural Science Foundation of China[41273035] ; 111 Project[BP0719022] ; Fundamental Research Funds for National Universities by the China University of Geosciences (Wuhan) |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000702853400004 |
| 出版者 | ELSEVIER |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; 111 Project ; 111 Project ; Fundamental Research Funds for National Universities by the China University of Geosciences (Wuhan) ; Fundamental Research Funds for National Universities by the China University of Geosciences (Wuhan) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; 111 Project ; 111 Project ; Fundamental Research Funds for National Universities by the China University of Geosciences (Wuhan) ; Fundamental Research Funds for National Universities by the China University of Geosciences (Wuhan) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; 111 Project ; 111 Project ; Fundamental Research Funds for National Universities by the China University of Geosciences (Wuhan) ; Fundamental Research Funds for National Universities by the China University of Geosciences (Wuhan) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; 111 Project ; 111 Project ; Fundamental Research Funds for National Universities by the China University of Geosciences (Wuhan) ; Fundamental Research Funds for National Universities by the China University of Geosciences (Wuhan) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/102751]  |
| 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 | Wu, Yuan-Bao |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.China Univ Geosci, Ctr Global Tecton, Sch Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Wen-Xiang,Wu, Yuan-Bao,Zhou, Guang-Yan,et al. Crustal architecture of the southern Tongbai orogen, central China: Insight from migmatites and post-collisional granites[J]. LITHOS,2021,404-405:17. |
| APA | Zhang, Wen-Xiang.,Wu, Yuan-Bao.,Zhou, Guang-Yan.,He, Yu.,Liu, Xiao-Chi.,...&Liu, Cheng-Yi-Hong.(2021).Crustal architecture of the southern Tongbai orogen, central China: Insight from migmatites and post-collisional granites.LITHOS,404-405,17. |
| MLA | Zhang, Wen-Xiang,et al."Crustal architecture of the southern Tongbai orogen, central China: Insight from migmatites and post-collisional granites".LITHOS 404-405(2021):17. |
入库方式： OAI收割
来源：地质与地球物理研究所
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