Ar-Ar dating on the metallogenesis of the Dongchuang gold deposit in the   Xiaoqinling area

CORC > 北京大学 > 地球与空间科学学院

	Ar-Ar dating on the metallogenesis of the Dongchuang gold deposit in the Xiaoqinling area
	Li, QZ ; Chen, YJ ; Zhong, ZQ ; Li, WL ; Li, SR ; Guo, XD ; Jin, BY
刊名	acta geologica sinica english edition
	2002
关键词	Dongchuang gold deposit Xiaoqinling area Ar-Ar plateau age decompression-geothermal increase transition from compression to extension NORTH CHINA CRATON FLUID FLUIDIZATION ORIGINS MODEL
英文摘要	The Dongchuang gold deposit in the Xiaoqinling area is an orogenic-type lode gold deposit. It is one of the few superlarge (>100 t An) deposits in China. Although it has been argued that it was formed in the Mesozoic, related isotopic age data have not been reported in previous studies. Based on detailed geological study, the authors have carried out isotopic dating on various metallogenic generations. The ore-forming process of the Dongchuang gold deposit consists of four stages: coarse-grained pyrite-bearing quartz veins (stage I), fine-grained pyrite-quartz veinlets (stage II), multi-sulfides (stage III) and carbonate-quartz veinlets (stage IV). Ar-Ar dating on mineral separates of stages I, II and III yields plateau ages of 142.9 +/- 2.9 Ma, 132.2 +/- 2.6 Ma and 128.3 +/- 6.2 Ma, respectively. Sericite separates from stage R assemblage also yield an Ar-Ar isochron age of 132.6 +/- 2.7 Ma, similar to the Ar-Ar plateau age. These results suggest that the Dongchuang gold deposit was mainly formed during 143-128 Ma, coinciding with the authors' geological observations and previous hypothesis. This ore formation is coeval with the regional-tectonic transition from collisional compression to extension, strongly showing that the decompression-geothermal increase regime during compression-to-extension transition is the most conducive geodynamic environment to orogenic-type gold mineralization.; Geosciences, Multidisciplinary; SCI(E); 9; ARTICLE; 4; 488-493; 76
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/401015]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Li, QZ,Chen, YJ,Zhong, ZQ,et al. Ar-Ar dating on the metallogenesis of the Dongchuang gold deposit in the Xiaoqinling area[J]. acta geologica sinica english edition,2002.
APA	Li, QZ.,Chen, YJ.,Zhong, ZQ.,Li, WL.,Li, SR.,...&Jin, BY.(2002).Ar-Ar dating on the metallogenesis of the Dongchuang gold deposit in the Xiaoqinling area.acta geologica sinica english edition.
MLA	Li, QZ,et al."Ar-Ar dating on the metallogenesis of the Dongchuang gold deposit in the Xiaoqinling area".acta geologica sinica english edition (2002).