U-Pb geochronology and Lu-Hf isotopes of zircons from newly identified   Permian-Early Triassic plutons in western Liaoning province along the   northern margin of the North China Craton: constraints on petrogenesis   and tectonic setting

doi:10.1007/s00531-012-0821-0

CORC > 北京大学 > 地球与空间科学学院

	U-Pb geochronology and Lu-Hf isotopes of zircons from newly identified Permian-Early Triassic plutons in western Liaoning province along the northern margin of the North China Craton: constraints on petrogenesis and tectonic setting
	Bai, Xiang ; Liu, Shuwen ; Wang, Wei ; Yang, Pengtao ; Li, Qiugen
刊名	international journal of earth sciences
	2013
关键词	Permian-Early Triassic magmatism Gabbro, diorite and monzogranite Zircon U-Pb-Hf isotopic systematics Petrogenesis Tectonic setting Northern margin of the North China Craton LITHOSPHERIC MANTLE BENEATH ASIAN OROGENIC BELT SINO-KOREAN CRATON INNER-MONGOLIA TRACE-ELEMENT CRUSTAL EVOLUTION GRANITIC PLUTONS MAFIC MAGMATISM YANGTZE BLOCK KEY ISSUES
DOI	10.1007/s00531-012-0821-0
英文摘要	Mafic to felsic gneisses along the northern margin of the North China Craton (NMNCC), in western Liaoning province, China, were previously assumed to be part of Archean metamorphic basement but are here identified as younger (Permian-Early Triassic) intrusions. LA-ICP-MS zircon U-Pb isotopic dating reveals that the magmatic precursors of the mafic gneisses were emplaced from 295 +/- A 3 to 259 +/- A 2 Ma and that the magmatic precursors of the dioritic and monzogranitic gneisses were emplaced at 267 +/- A 1 and 251 +/- A 2 Ma, respectively, thus recording a continuum of Permian to Early Triassic magmatism. The mafic and dioritic rocks exhibit zircon epsilon(Hf)(t) values from -20.7 to -3.3, suggesting they were mainly derived from a metasomatized lithospheric mantle source, possibly involving some crustal contamination. The monzogranitic rocks display their zircon epsilon(Hf)(t) values of +0.9 to +4.7, indicating the acidic magma was derived from partial melting of juvenile crustal materials from the depleted mantle source. Crustal model ages (T (DM) (C) ) obtained from zircon Hf isotopes of these monzogranitic rocks range from 976 to 1,215 Ma, with an average of 1,074 +/- A 32 Ma, possibly implying an episode of Grenvillian crustal growth in western Liaoning province. These new lines of evidence show that the NMNCC witnessed abundant magmatic activity and interaction of the crust and mantle during the Permian and Early Triassic and that the mafic magmatism was earlier than the monzogranitic activity. These findings indicate that the monzogranitic activity was the result of underplating of mafic magma with an enriched mantle source. In the context of regional Late Paleozoic to Early Mesozoic magmatic activity, the Permian magmatism occurred in an Andean-style continental margin setting when the Paleo-Asian oceanic plate was subducted beneath the NMNCC, and in this context, the Late Permian to Early Triassic magmatism may have been linked to post-collisional extension and asthenospheric upwelling, suggesting that the western Liaoning province in the NMNCC may be an eastward extension of the Late Paleozoic to Early Mesozoic active continental margin.; Geosciences, Multidisciplinary; SCI(E); 4; ARTICLE; 3; 671-685; 102
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/155641]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Bai, Xiang,Liu, Shuwen,Wang, Wei,et al. U-Pb geochronology and Lu-Hf isotopes of zircons from newly identified Permian-Early Triassic plutons in western Liaoning province along the northern margin of the North China Craton: constraints on petrogenesis and tectonic setting[J]. international journal of earth sciences,2013.
APA	Bai, Xiang,Liu, Shuwen,Wang, Wei,Yang, Pengtao,&Li, Qiugen.(2013).U-Pb geochronology and Lu-Hf isotopes of zircons from newly identified Permian-Early Triassic plutons in western Liaoning province along the northern margin of the North China Craton: constraints on petrogenesis and tectonic setting.international journal of earth sciences.
MLA	Bai, Xiang,et al."U-Pb geochronology and Lu-Hf isotopes of zircons from newly identified Permian-Early Triassic plutons in western Liaoning province along the northern margin of the North China Craton: constraints on petrogenesis and tectonic setting".international journal of earth sciences (2013).