Ultrahigh temperature metamorphism and isobaric cooling of Neoarchean ultramafic-mafic granulites in the southern granulite terrain, India: Phase equilibrium modelling and SHRIMP zircon U-Pb dating
文献类型：期刊论文
| 作者 | Gou, Long-Long3; Zhai, Ming-Guo2,3; Zhang, Cheng-Li3; George, Paul Mathews3; Lu, Jun-Sheng3; Zhao, Yan3; Ao, Wen-Hao3; Hu, Yu-Hua3; Zi, Jian-Wei1,4; Zhou, Feng3 |
| 刊名 | JOURNAL OF METAMORPHIC GEOLOGY
 |
| 出版日期 | 2022-02-14 |
| 页码 | 31 |
| 关键词 | garnet pyroxenite lower crust mafic granulite phase equilibrium modelling Southern Granulite Terrain |
| ISSN号 | 0263-4929 |
| DOI | 10.1111/jmg.12654 |
| 英文摘要 | This study presents the results of petrology, SHRIMP zircon U-Pb analysis, conventional Fe-Mg geothermobarometry, REE (rare earth element)-based geothermobarometry, and phase equilibrium modelling, for newly discovered ultramafic-mafic granulites (garnet pyroxenite with minor plagioclase and garnet-bearing granulite) in the Namakkal Block of the southern granulite terrain (SGT), India. Results from this study shed light on the growth, evolution, and thermal state of lower continental crust during the Neoarchean, as a cross-section of the Archean lower continental crust is well-exposed in the SGT. SHRIMP zircon U-Pb dating of a garnet pyroxenite sample (18ID-41) yielded a weighted mean Pb-207/Pb-206 age of 2531 +/- 6 Ma, which is the same within uncertainty as one weighted mean SHRIMP metamorphic zircon Pb-207/Pb-206 age of 2519 +/- 9 Ma from mafic granulite sample (18ID-43). In addition, zircon U-Pb analyses also yielded an apparent Pb-207/Pb-206 age of 2474 +/- 3 Ma (1 sigma) for the garnet pyroxenite, and a weighted mean Pb-207/Pb-206 age of 2489 +/- 8 Ma for the mafic granulite. Thus, the timing of metamorphism of the ultramafic-mafic granulites was constrained to be ca. 2530-2470 Ma. The peak metamorphic phase assemblage of the garnet pyroxenite is grt-cpx-pl-ilm-liq, which was modelled to be stable at 1058-1172 degrees C/7.8-11.6 kbar, whereas the retrograde mineral assemblage of grt-cpx-hbl-pl-qz-ilm-liq occurred at 877-888 degrees C/9.9-11 kbar. The mafic granulite was demonstrated to record similar peak and retrograde metamorphic P-T conditions to those of the garnet pyroxenite but have a relatively small P-T range of the peak mineral assemblage. The ultrahigh temperature metamorphism of these ultramafic-mafic granulites was further confirmed by the temperature results (1057-1087 degrees C) from the REE-in-two-pyroxene thermometer. As a result, a retrograde metamorphic P-T path characterized by near-isobaric cooling from similar to 1080 degrees C at similar to 10 kbar to similar to 900 degrees C at similar to 10 kbar was constructed for these rocks, which is consistent with an extremely high thermal state that persisted for ca. 60 Ma in the lower crust. |
| WOS关键词 | NORTH CHINA CRATON ; HIGH-GRADE METAMORPHISM ; HIGH-PRESSURE GRANULITES ; WESTERN DHARWAR CRATON ; CRUSTAL EVOLUTION ; CONTINENTAL-CRUST ; GARNET PYROXENITE ; KHONDALITE BELT ; ARC MAGMATISM ; NILGIRI BLOCK |
| 资助项目 | National Natural Science Foundation of China[41890831] ; State Key Laboratory of Continental Dynamics[SKLCD-04] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000754764500001 |
| 出版者 | WILEY |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Continental Dynamics ; State Key Laboratory of Continental Dynamics ; State Key Laboratory of Continental Dynamics ; State Key Laboratory of Continental Dynamics ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Continental Dynamics ; State Key Laboratory of Continental Dynamics ; State Key Laboratory of Continental Dynamics ; State Key Laboratory of Continental Dynamics ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Continental Dynamics ; State Key Laboratory of Continental Dynamics ; State Key Laboratory of Continental Dynamics ; State Key Laboratory of Continental Dynamics ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Continental Dynamics ; State Key Laboratory of Continental Dynamics ; State Key Laboratory of Continental Dynamics ; State Key Laboratory of Continental Dynamics |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/104937]  |
| 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 | Zhai, Ming-Guo |
| 作者单位 | 1.Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 3.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian, Peoples R China 4.Curtin Univ, John de Laeter Ctr, Bentley, WA, Australia |
| 推荐引用方式 GB/T 7714 | Gou, Long-Long,Zhai, Ming-Guo,Zhang, Cheng-Li,et al. Ultrahigh temperature metamorphism and isobaric cooling of Neoarchean ultramafic-mafic granulites in the southern granulite terrain, India: Phase equilibrium modelling and SHRIMP zircon U-Pb dating[J]. JOURNAL OF METAMORPHIC GEOLOGY,2022:31. |
| APA | Gou, Long-Long.,Zhai, Ming-Guo.,Zhang, Cheng-Li.,George, Paul Mathews.,Lu, Jun-Sheng.,...&Zhou, Feng.(2022).Ultrahigh temperature metamorphism and isobaric cooling of Neoarchean ultramafic-mafic granulites in the southern granulite terrain, India: Phase equilibrium modelling and SHRIMP zircon U-Pb dating.JOURNAL OF METAMORPHIC GEOLOGY,31. |
| MLA | Gou, Long-Long,et al."Ultrahigh temperature metamorphism and isobaric cooling of Neoarchean ultramafic-mafic granulites in the southern granulite terrain, India: Phase equilibrium modelling and SHRIMP zircon U-Pb dating".JOURNAL OF METAMORPHIC GEOLOGY (2022):31. |
入库方式： OAI收割
来源：地质与地球物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。