Geochronological Framework and Geodynamic Implications of Mafic Magmatism in the Liaodong Peninsula and Adjacent Regions, North China Craton

doi:10.1111/1755-6724.12647

CORC > 北京大学 > 地球与空间科学学院

	Geochronological Framework and Geodynamic Implications of Mafic Magmatism in the Liaodong Peninsula and Adjacent Regions, North China Craton
	Li Zhuang ; Chen Bin ; Wang Jialin
刊名	Acta Geologica Sinica
	2016
关键词	mafic rocks geochronology Liaodong Peninsula tectonic setting PALEOPROTEROZOIC CRUSTAL EVOLUTION WHOLE-ROCK GEOCHEMISTRY PB ZIRCON GEOCHRONOLOGY SOUTH-LIAOHE-GROUP U-PB TECTONIC IMPLICATIONS EASTERN BLOCK JI BELT LIAONING-PROVINCE JILIN PROVINCE
DOI	10.1111/1755-6724.12647
英文摘要	Mafic rocks are widespread on the Liaodong Peninsula and adjacent regions of the North China Craton. The majority of this magmatism was originally thought to have occurred during the Pre-Sinian, although the precise geochronological framework of this magmatism was unclear. Here, we present the results of more than 60 U-Pb analyses of samples performed over the past decade, with the aim of determining the spatial and temporal distribution of mafic magmatism in this area. These data indicate that Paleoproterozoic-Mesoproterozoic mafic rocks are not as widely distributed as previously thought. The combined geochronological data enabled the subdivision of the mafic magmatism into six episodes that occurred during the middle Paleoproterozoic, the late Paleoproterozoic, the Mesoproterozoic, the Late Triassic, the Middle Jurassic, and the Early Cretaceous. The middle Paleoproterozoic (2.1-2.2 Ga) mafic rocks formed in a subduction-related setting and were subsequently metamorphosed during a ca. 1.9 Ga arc-continent collision event. The late Paleoproterozoic (ca. 1.87-1.82 Ga) bimodal igneous rocks mark the end of a Paleoproterozoic tectonothermal event, whereas Mesoproterozoic mafic dike swarms record global-scale Mesoproterozoic rifting associated with the final breakup of the Columbia supercontinent. The Late Triassic mafic magmatism is part of a Late Triassic magmatic belt that was generated by post-collisional extension. The Middle Jurassic mafic dikes formed in a compressive tectonic setting, and the Early Cretaceous bimodal igneous rocks formed in an extensional setting similar to a back-arc basin. These latter two periods of magmatism were possibly related to subduction of the Paleo-Pacific plate.; supported by the National Key Basic Research Program of China,the National Natural Science Foundation of China,the Opening Foundation of the Peking University,Undergraduates Innovating Experimentation Project of Jilin University; SCI(E); 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); lizhuangcc@pku.edu.cn; binchen@pku.edu.cn; 1; 138-153; 90
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/446832]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Li Zhuang,Chen Bin,Wang Jialin. Geochronological Framework and Geodynamic Implications of Mafic Magmatism in the Liaodong Peninsula and Adjacent Regions, North China Craton[J]. Acta Geologica Sinica,2016.
APA	Li Zhuang,Chen Bin,&Wang Jialin.(2016).Geochronological Framework and Geodynamic Implications of Mafic Magmatism in the Liaodong Peninsula and Adjacent Regions, North China Craton.Acta Geologica Sinica.
MLA	Li Zhuang,et al."Geochronological Framework and Geodynamic Implications of Mafic Magmatism in the Liaodong Peninsula and Adjacent Regions, North China Craton".Acta Geologica Sinica (2016).