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  4. 岩石圈演化国家重点实验室
Extensive magmatism and metamorphism at ca. 3.2 Ga in the eastern Kaapvaal Craton

文献类型：期刊论文

作者Wang, Hao1,4,5; Yang, Jin-Hui1,4,5; Kroener, Alfred2,3; Zhu, Yu-Sheng4,5; Wei, Qin-Di1,4,5; Li, Rui1,4,5; Xu, Lei1,4,5
刊名PRECAMBRIAN RESEARCH
出版日期2020-12-01
卷号351页码:22
关键词Zircon U-Pb age Ti-in-zircon thermometry Y-in-monazite thermometry Ultrahigh-temperature metamorphism Barberton granitoid-greenstone terrane Swaziland
ISSN号0301-9268
DOI10.1016/j.precamres.2020.105952
英文摘要The timing of the emergence of modern-style plate tectonics on Earth is of fundamental importance in understanding the thermal and compositional history of the planet. Although the magmatism and metamorphism in the eastern Kaapvaal Craton was thought by some as geological records for mid-Archean subduction at 3.2 Ga, their petrogenesis was fiercely debated. To reveal the nature of the 3.2 Ga magmatism and metamorphism in the eastern Kaapvaal Craton, here we provide a comprehensive zircon and monazite U-Pb geochronological investigation, coupled with in situ trace element and Hf-O isotopic analyses, for the magmatic and metamorphic rocks from the Barberton granitoid-greenstone terrane in South Africa and Ancient Gneiss Complex in Swaziland. In spite of deriving from potentially different sources as revealed by different lithology, nine magmatic rocks sampled from different plutons have consistent zircon/monazite SIMS Pb-207/Pb-206 ages of 3240-3220 Ma. Distinct zircon grains, including inherited magmatic and metamorphic, are identified in the metamorphic rocks by detailed CL images and U-Pb geochronological, trace elemental and Hf-O isotopic analyses. The metamorphic zircons give consistent Pb-207/Pb-206 ages of 3240-3220 Ma. One granitic gneiss and a metapelite give monazite SIMS Pb-207/Pb-206 dates of 3230.6 +/- 2.7 Ma and 3223.1 +/- 2.4 Ma, respectively, which are consistent with the results of metamorphic zircon and interpreted as the age of metamorphism. Most metamorphic samples give Ti-in-zircon temperatures of 650-740 degrees C and one sample yields Y-in-monazite temperatures of 918-966 degrees C, which imply that the rocks of AGC were universally metamorphosed to upper amphibolite facies, and locally reaching high to ultrahigh temperature (HT-UHT) granulite facies (>900 degrees C) at 3240-3220 Ma. This study, in combination with previous results, suggests widespread distribution for the 3.2 Ga magmatism and metamorphism in the eastern Kaapvaal Craton without asymmetry in the thermal structure, which is quite different from those of the modern subduction zones. The synchronous occurrence of the metamorphism and magmatism in the eastern Kaapvaal Craton at 3.2 Ga was interpreted as the results of partial convective overturn of the crust.
WOS关键词BARBERTON GREENSTONE-BELT ; ANCIENT GNEISS COMPLEX ; TRACE-ELEMENT GEOCHEMISTRY ; PARTIAL CONVECTIVE OVERTURN ; NATURAL REFERENCE MATERIAL ; HAFNIUM ISOTOPE EVIDENCE ; ARCHEAN GRANITIC-ROCKS ; INYONI SHEAR ZONE ; TI-IN-ZIRCON ; U-PB ISOTOPE
资助项目B-type Strategic Priority Program of the Chinese Academy of Sciences[XDB41000000] ; Youth Innovation Promotion Association of the Chinese Academy of Sciences[2020068] ; State Key Laboratory of Lithospheric Evolution[SKL-Z201901-YT] ; National Natural Science Foundation of China[41688103] ; National Natural Science Foundation of China[41973035]
WOS研究方向Geology
语种英语
WOS记录号WOS:000595149400008
出版者ELSEVIER
资助机构B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/99915]  
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Wang, Hao
作者单位1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Chinese Acad Geol Sci, Beijing SHRIMP Ctr, Inst Geol, Beijing 100037, Peoples R China
3.Johannes Gutenberg Univ Mainz, Inst Geowissensch, D-55099 Mainz, Germany
4.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
5.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		 Wang, Hao,Yang, Jin-Hui,Kroener, Alfred,et al. Extensive magmatism and metamorphism at ca. 3.2 Ga in the eastern Kaapvaal Craton[J]. PRECAMBRIAN RESEARCH,2020,351:22.
APA Wang, Hao.,Yang, Jin-Hui.,Kroener, Alfred.,Zhu, Yu-Sheng.,Wei, Qin-Di.,...&Xu, Lei.(2020).Extensive magmatism and metamorphism at ca. 3.2 Ga in the eastern Kaapvaal Craton.PRECAMBRIAN RESEARCH,351,22.
MLA Wang, Hao,et al."Extensive magmatism and metamorphism at ca. 3.2 Ga in the eastern Kaapvaal Craton".PRECAMBRIAN RESEARCH 351(2020):22.

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来源：地质与地球物理研究所

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