Research on SHRIMP U-Pb chronology in Xiaoqinling-Xionger' shan area: the evidence of delamination of lithosphere in Qinling orogenic belt

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	Research on SHRIMP U-Pb chronology in Xiaoqinling-Xionger' shan area: the evidence of delamination of lithosphere in Qinling orogenic belt
	Wang, TH (Wang TuanHua); Mao, JW (Mao JingWen); Wang, YB (Wang YanBin)
刊名	ACTA PETROLOGICA SINICA
	2008
卷号	24 期号:6 页码:1273-1287
关键词	dike chronology of zircon SHRIMP IIU-Pb dating delamination Xiaoqinling-Xiong' ershan area Qinling orogenic belt Southern of North China craton
ISSN号	1000-0569
英文摘要	Chronology research by SHRIMP II U-Pb dating on zircon from dikes of Xiaoqinling-Xiong' ershan area show that the zircons in dike magmas source mainly are inherited ones, which manifest chronologic characteristics of Southern edge of North China continental basement. The two dikes which have definite geological relation that invaded into granite of Mesozoic epoch may give the dating results of 1843 +/- 10Ma and 768 +/- 15Ma, and most zircon show the time of 1850Ma for a very large scale volcanic activity events of Xiong' er group in the region, only few of zircon show the reasonable time of 128Ma in Mesozoic epoch. To view the chronologic data as a whole, the zircons in dikes comprehensively record the regional history of tectonic evolution. The results of zircon dating reflected the tectonic and magmas events in North China craton as Fuping movement (2500 similar to 2400Ma), volcanic eruption activity of Xionger' group in Southern edge of North China craton (1850Ma), Paleo-Sinian tectonic movement (850 similar to 700Ma) and succession events of orogen process (similar to 200Ma) and dike magmas invading events(similar to 130Ma) with Yangtze plate subducted and matched to Southern edge of North China craton. Research on tracing of Sr, Nd, Pb of dikes reveal that the magmas source of dikes have much affinity to Yangtze Plate, the fact testified the dynamic process of Yangtze plate subduction to Southern edge of North China craton from Neo-Priterozoic to Pilo-Paleozoic time and delamination of continental low Crust of Qinling orogenic belt in Southern edge of North China in post of orogen in the late. The reason for most of dating results of zircon in dikes show the characteristics of inherited one possibly is that the zircon grain grow small in Mesozoic epoch, but the inherit zircons grain are bigger than the zircon in Mesozoic, so that most of inherit zircon were selected during mineral sorting but Mesozoic zircon were difficult to be selected out.
学科主题	固体地球物理学
WOS关键词	NORTH CHINA ; GEODYNAMIC SETTINGS ; DEPOSITS ; AGES
WOS研究方向	Geology
语种	中文
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000259628800010
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38636]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	Wang, TH ,Mao, JW ,Wang, YB . Research on SHRIMP U-Pb chronology in Xiaoqinling-Xionger' shan area: the evidence of delamination of lithosphere in Qinling orogenic belt[J]. ACTA PETROLOGICA SINICA,2008,24(6):1273-1287.
APA	Wang, TH ,Mao, JW ,&Wang, YB .(2008).Research on SHRIMP U-Pb chronology in Xiaoqinling-Xionger' shan area: the evidence of delamination of lithosphere in Qinling orogenic belt.ACTA PETROLOGICA SINICA,24(6),1273-1287.
MLA	Wang, TH ,et al."Research on SHRIMP U-Pb chronology in Xiaoqinling-Xionger' shan area: the evidence of delamination of lithosphere in Qinling orogenic belt".ACTA PETROLOGICA SINICA 24.6(2008):1273-1287.