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Archean crustal growth and reworking revealed by combined U-Pb-Hf-O isotope and trace element data of detrital zircons from ancient and modern river sediments of the eastern Kaapvaal Craton

文献类型：期刊论文

作者Wang, Hao1,2,3; Yang, Jin-Hui1,2,3; Zhu, Yu-Sheng1,2; Huang, Chao1,2; Xu, Lei1,2; Wu, Shi-Tou1,2; Liu, Yu1,2
刊名GEOCHIMICA ET COSMOCHIMICA ACTA
出版日期2022-03-01
卷号320页码:79-104
关键词Detrital zircon U-Pb age Hf-O isotopes Trace element Kaapvaal Craton Barberton granitoid-greenstone terrane Crustal growth
ISSN号0016-7037
DOI10.1016/j.gca.2021.12.025
英文摘要It is intriguing to speculate on how continental crust grew and differentiated during the Archean and which tectonic regimes and magmatic mechanisms were responsible for such a process. The continental nucleus of the Kaapvaal Craton, which includes the Barberton granitoid-greenstone terrane (BGGT) in South Africa and the Ancient Gneiss Complex (AGC) in Swaziland, exhibits the best preserved geological record from 3.6 to 3.0 Ga and thus provides the optimal location to address this issue. In this study, combined U-Pb, O and Lu-Hf isotope and trace element analyses were carried out on detri-tal zircon grains from two Moodies Group sandstones and three modern river sand samples in the Barberton and Swaziland regions, southern Africa. The results, in conjunction with previously published data, show that the detrital zircons in the Moodies sandstones on both sides of the Inyoka Fault, had two similar U-Pb age clusters of 3.25-3.30 Ga and 3.40- 3.47 Ga and the oldest age up to 3.57 Ga. This suggests that they were derived from older felsic volcanic rocks of the green-stone belt and the granitoid gneisses in the BGGT and AGC. Using the approach created for Earth's oldest zircons (i.e., Jack Hills detrital zircons), we inferred that the source magmas of the studied detrital zircons had average arc-like andesitic com-positions (SiO2 = 58.0 +/- 5.6 wt.%; Th/Nb = 5.0 & nbsp; +/-& nbsp;3.2), similar to those of the Jack Hills detrital zircons. However, these inferred compositions conflict with the source rocks of the detrital zircons, namely, the felsic volcanic rocks and the granitoid gneisses in the BGGT and AGC, which have high SiO2 contents (average = 70 +/-& nbsp; 4.3 wt.%) and moderate Th/Nb ratios (average = 0.76 +/- 0.44). These findings suggest that the inferred average andesitic compositions for the Earth's oldest zircons should be reevaluated. The U-Pb age spectra of detrital zircons in modern river sands suggest that the exposed rocks in south -western Swaziland are dominantly ca. 3.45 Ga tonalitic, trondhjemitic and granodioritic (TTG) gneisses without Eoarchean crust. The concordant zircon U-Pb age data reveal four major magmatic episodes for the eastern Kaapvaal Craton at 3.52, 3.46, 3.26 and 3.10 Ga. The first magmatic episode is suggested to dictate crustal growth, whereas the other three magmatic episodes are predominated by crustal reworking. This process is manifested by major positive changes in epsilon(Hf)(t) and epsilon(Nd)(t) values starting at similar to 3.5 Ga, gradual decreases in epsilon(Hf)(t) and epsilon(Nd)(t) values afterwards, and increases in delta O-18 values at similar to 3.25 Ga. Combined with other geological observations, we suggest that modern-style plate tectonic processes, such as sub-duction, may not have been a requirement for crustal growth and reworking in the eastern Kaapvaal Craton during the Paleoarchean (3.6-3.2 Ga). Instead, they could be ascribed to episodic partial convective overturns at different crustal depths.(c) 2021 Elsevier Ltd. All rights reserved.
WOS关键词BARBERTON GREENSTONE-BELT ; LU-HF ; SOUTH-AFRICA ; CONTINENTAL-CRUST ; MOUNTAIN LAND ; GNEISS COMPLEX ; GRANITIC-ROCKS ; BILLION YEARS ; SM-ND ; SUPRACRUSTAL ROCKS
资助项目B-type Strategic Priority Pro-gram of the Chinese Academy of Sciences[XDB41000000] ; National Natural Science Foundation of China[41973035] ; National Natural Science Foundation of China[41688103] ; Youth Innovation Promotion Association of the Chinese Academy of Sciences[2020068] ; State Key Laboratory of Lithospheric Evolution[SKL-Z201901-YT]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000786623000003
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构B-type Strategic Priority Pro-gram of the Chinese Academy of Sciences ; B-type Strategic Priority Pro-gram of the Chinese Academy of Sciences ; B-type Strategic Priority Pro-gram of the Chinese Academy of Sciences ; B-type Strategic Priority Pro-gram of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; 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 ; B-type Strategic Priority Pro-gram of the Chinese Academy of Sciences ; B-type Strategic Priority Pro-gram of the Chinese Academy of Sciences ; B-type Strategic Priority Pro-gram of the Chinese Academy of Sciences ; B-type Strategic Priority Pro-gram of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; 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 ; B-type Strategic Priority Pro-gram of the Chinese Academy of Sciences ; B-type Strategic Priority Pro-gram of the Chinese Academy of Sciences ; B-type Strategic Priority Pro-gram of the Chinese Academy of Sciences ; B-type Strategic Priority Pro-gram of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; 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 ; B-type Strategic Priority Pro-gram of the Chinese Academy of Sciences ; B-type Strategic Priority Pro-gram of the Chinese Academy of Sciences ; B-type Strategic Priority Pro-gram of the Chinese Academy of Sciences ; B-type Strategic Priority Pro-gram of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; 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
源URL[http://ir.iggcas.ac.cn/handle/132A11/105139]  
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.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Hao,Yang, Jin-Hui,Zhu, Yu-Sheng,et al. Archean crustal growth and reworking revealed by combined U-Pb-Hf-O isotope and trace element data of detrital zircons from ancient and modern river sediments of the eastern Kaapvaal Craton[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2022,320:79-104.
APA Wang, Hao.,Yang, Jin-Hui.,Zhu, Yu-Sheng.,Huang, Chao.,Xu, Lei.,...&Liu, Yu.(2022).Archean crustal growth and reworking revealed by combined U-Pb-Hf-O isotope and trace element data of detrital zircons from ancient and modern river sediments of the eastern Kaapvaal Craton.GEOCHIMICA ET COSMOCHIMICA ACTA,320,79-104.
MLA Wang, Hao,et al."Archean crustal growth and reworking revealed by combined U-Pb-Hf-O isotope and trace element data of detrital zircons from ancient and modern river sediments of the eastern Kaapvaal Craton".GEOCHIMICA ET COSMOCHIMICA ACTA 320(2022):79-104.

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