Triassic tectonics and mineral systems in the Qinling Orogen, central   China

doi:10.1002/gj.2618

CORC > 北京大学 > 地球与空间科学学院

	Triassic tectonics and mineral systems in the Qinling Orogen, central China
	Chen, Yan-Jing ; Santosh, M.
刊名	geological journal
	2014
关键词	Qinling Orogen Palaeo-Tethys Triassic tectonic setting mineral systems active continental margin PB-ZN DEPOSIT YANGSHAN GOLD DEPOSIT ZHAIWA MO-CU RE-OS ISOTOPE GEOCHEMISTRY SHAANXI PROVINCE HENAN PROVINCE COLUMBIA SUPERCONTINENT MOLYBDENUM DEPOSIT FLUID INCLUSION
DOI	10.1002/gj.2618
英文摘要	The Qinling Orogen in central China preserves the records of a complex geological and tectonic history, and also carries abundant mineral resources. Previous investigations on the Qinling Orogen have identified that the final transition from the Palaeo-Tethys Ocean to a continental orogen occurred in the Triassic, although the timing of the oceanic closure and the tectonic affinity of the Triassic Qinling belt have been poorly constrained. In this contribution, we compile the palaeomagnetic data and geological evidence related to sedimentation, magmatism and mineral systems. The palaeomagnetic data show that the Palaeo-Tethys Ocean in the Qinling Orogen gradually closed westward during the Triassic, terminating in the beginning of the Jurassic. Triassic strata are widely developed in the Qinling Orogen and conformably overlie the Permian strata. They are composed of carbonates and siliciclastic rocks that were strongly deformed and weakly metamorphosed during the Late Triassic to Late Jurassic. The Triassic magmatic rocks are dominated by I-type granitoids, with subordinate S-type and alkaline granites and minor carbonatite dykes, with a clear northward transition in lithology and geochemical features from the Mian-Lue Suture. Different types of Triassic mineral systems have been reported from this region, including sedimentary-hosted epizonogenic hydrothermal Hg-Sb, Pb-Zn+/-Ag, Au deposits, metamorphic hydrothermal lodes of Au, Ag-Pb-Zn, Mo-Au and Mo, magmatic hydrothermal systems including porphyry Mo, breccia pipe Au, and carbonatite-hosted Mo deposits. We infer that the Triassic Qinling Orogen witnessed synchronous oceanic plate subduction in the west and continental linkage in the east, with a transition from oceanic basin to continental orogen through gradual subduction-related consumption of the oceanic plate. The Palaeo-Tethys Ocean closed in a westward scissor-like fashion in the Triassic and continental collision and extensive crustal shortening in the Jurassic, following which post-collisional extension occurred in the Early Cretaceous. Copyright (C) 2014 John Wiley & Sons, Ltd.; Geosciences, Multidisciplinary; SCI(E); 6; ARTICLE; yjchen@pku.edu.cn; 4-5,SI; 338-358; 49
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/231004]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Chen, Yan-Jing,Santosh, M.. Triassic tectonics and mineral systems in the Qinling Orogen, central China[J]. geological journal,2014.
APA	Chen, Yan-Jing,&Santosh, M..(2014).Triassic tectonics and mineral systems in the Qinling Orogen, central China.geological journal.
MLA	Chen, Yan-Jing,et al."Triassic tectonics and mineral systems in the Qinling Orogen, central China".geological journal (2014).