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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
Gou, Long-Long1; Zhai, Ming-Guo1,2; Zhang, Cheng-Li1; George, Paul Mathews1; Lu, Jun-Sheng1; Zhao, Yan1; Ao, Wen-Hao1; Hu, Yu-Hua1; Zi, Jian-Wei3,4; Zhou, Feng1
2022-02-14
Source PublicationJOURNAL OF METAMORPHIC GEOLOGY
ISSN0263-4929
Pages31
AbstractThis 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.
Keywordgarnet pyroxenite lower crust mafic granulite phase equilibrium modelling Southern Granulite Terrain
DOI10.1111/jmg.12654
Funding OrganizationNational 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
WOS KeywordNORTH CHINA CRATON ; HIGH-GRADE METAMORPHISM ; HIGH-PRESSURE GRANULITES ; WESTERN DHARWAR CRATON ; CRUSTAL EVOLUTION ; CONTINENTAL-CRUST ; GARNET PYROXENITE ; KHONDALITE BELT ; ARC MAGMATISM ; NILGIRI BLOCK
Language英语
Funding ProjectNational Natural Science Foundation of China[41890831] ; State Key Laboratory of Continental Dynamics[SKLCD-04]
Funding OrganizationNational 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
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000754764500001
PublisherWILEY
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/104937
Collection岩石圈演化国家重点实验室
Corresponding AuthorZhai, Ming-Guo
Affiliation1.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan, Peoples R China
4.Curtin Univ, John de Laeter Ctr, Bentley, WA, Australia
Corresponding Author AffilicationState Key Laboratory of Lithospheric Evolution
Recommended Citation
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.
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