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Casting a vote for shifting the Statherian: Petrogenesis of 1.70 and 1.62 Ga mafic dykes in the North China Craton

文献类型：期刊论文

作者Wang, Chong1; Peng, Peng1,2; Mitchell, Ross N.1,2; Liu, Xu1,2
刊名LITHOS
出版日期2022-04-01
卷号414-415页码:17
关键词Petrogenesis Mafic dyke swarm North China Craton Proterozoic Statherian Supercontinent Columbia/Nuna
ISSN号0024-4937
DOI10.1016/j.lithos.2022.106631
英文摘要The Statherian Period (1.8-1.6 Ga), currently the final period of the Paleoproterozoic Era, is named "stable, firm" for the interval following orogenesis (the Orosirian Period) that culminated in the assembly of likely Earth's first supercontinent, Columbia. Thus, the Paleoproterozoic-Mesoproterozoic boundary is supposed to demarcate increased continental "stability", defined as a transition from orogenesis and arc magmatism to unmetamorphosed shallow-water cover sequences and intraplate magmatism. It has become apparent, however, that (i) the assembly of Columbia appears to be highly diachronous and (ii) many stable cover sequences once mapped as Mesoproterozoic appear to pre-date 1.6 Ga quite significantly. These discrepancies have led to the recent suggestion by a large group of Precambrian geologists that the Statherian Period belongs more to the Mesoproterozoic Era and thus that the end of the Paleoproterozoic Era should be redefined at ca. 1.8 Ga. North China Craton is one such craton that has pre-1.6 Ga stable sedimentary covers, but dating the base of the basins have proven difficult and thus other indicators of continental stability must be sought. Here we present new geochronological and geochemical data from two dyke swarms at 1.70 and 1.62 Ga from western Shandong Province (Luxi area) of the North China Craton that can be used to constrain the tectonic setting at this critical interval in question. Precise U-Pb SIMS analysis yields baddeleyite Pb-207/Pb-206 ages of 1700 +/- 5 Ma (n = 9, MSWD = 0.14) and 1620 +/- 4 Ma (n = 14, MSWD = 0.56). The new dated ca. 1.62 Ga Xiaobeizhuang dyke (330 degrees trending, >15 m wide) belongs to the coeval Taishan dyke swarm. The ca. 1.70 Ga swarm, newly discovered in the North China Craton, is referred to as Ximaiyao dyke swarm (340-345 degrees trending, 0.4-13 m wide). Paleogeographic affinities of the North China Craton with the Sao Francisco Craton in supercontinent Columbia are considered in light of this newly identified swarm. Given that both dyke swarms pre-date 1.6 Ga and that their geochemistry implies intraplate magmatism, our new data support the suggestion that this time is more Mesoproterozoic than Paleoproterozoic in character. These pre-1.6 Ga intraplate dyke swarms, including the 1.78 Ga, the 1.73 Ga, and later 1.70 Ga and 1.68-1.62 Ga swarms, thus provide local support from North China Craton for redefining the base of the Mesoproterozoic Era as ca. 1.8 Ga and including the Statherian Period, consistent with the ages of platform cover sequences.
WOS关键词U-PB BADDELEYITE ; DAMIAO ANORTHOSITE COMPLEX ; WESTERN SHANDONG PROVINCE ; LARGE IGNEOUS PROVINCE ; SAO FRANCISCO CRATON ; PRECAMBRIAN TIME ; RAPAKIVI GRANITE ; ISOTOPIC CONSTRAINTS ; TECTONIC EVOLUTION ; MA
资助项目National Natural Science Foundation of China[41890833] ; National Natural Science Foundation of China[42102243] ; China Postdoctoral Science Foundation[2020M670443]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000762494500003
出版者ELSEVIER
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 ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation
源URL[http://ir.iggcas.ac.cn/handle/132A11/104974]  
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, Chong; Peng, Peng
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Chong,Peng, Peng,Mitchell, Ross N.,et al. Casting a vote for shifting the Statherian: Petrogenesis of 1.70 and 1.62 Ga mafic dykes in the North China Craton[J]. LITHOS,2022,414-415:17.
APA Wang, Chong,Peng, Peng,Mitchell, Ross N.,&Liu, Xu.(2022).Casting a vote for shifting the Statherian: Petrogenesis of 1.70 and 1.62 Ga mafic dykes in the North China Craton.LITHOS,414-415,17.
MLA Wang, Chong,et al."Casting a vote for shifting the Statherian: Petrogenesis of 1.70 and 1.62 Ga mafic dykes in the North China Craton".LITHOS 414-415(2022):17.

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来源：地质与地球物理研究所

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