Discovery of adakitic rocks in south margin of Dunhuang block and its geological significance

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	Discovery of adakitic rocks in south margin of Dunhuang block and its geological significance
	Zhu Tao 2; Wang HongLiang ; Xu XueYi ; Chen JunLu ; Ma ZhongPing ; Li ZhiPei ; Zhu XiaoHui ; Li Ping
刊名	ACTA PETROLOGICA SINICA
	2014
卷号	30 期号:2 页码:491-502
关键词	Biotitequartz-diorite U-Pb chronology Sr-Nd isotope Hf isotope Qingshigou Dunhuang complex
ISSN号	1000-0569
英文摘要	The Qingshigou biotitequartz-diorite intruded into the Dunhuang complexes, zircon LA ICP-MS U-Pb data reveal the crystallization age of 335 +/- 2Ma. The diorite is featured by high contents of SiO2, Al2O3, and low content of MgO; the trace element display adakitic affinity, which are characaterized by strong enrichment of Sr, depletion of Yb and Y, and high ratio of Sr/Y; moreover, the whole rock shows a high Mg-#, low Cr, Ni contents, and normal Eu value. Nd and Hf isotopic compositions (epsilon(Nd)(t) = -9.39 similar to -11.03, epsilon(Hf)(t) = -7.6 similar to -16.6) suggest that the rock originated from the typical continental crust. Nd isochronal age of the whole rock (1.83 similar to 1.98Ga) and Hf two-stage model age (1.53 similar to 1.95Ga) demonstrate that the Qingshigou biotitequartz-diorite is likely derived from the source where materials are related to the Proterozoic Dunhuang complexes. Therefore, we suggest that the Qingshigou biotitequartz-diorite may have originated from the partial melted thickened lower crust. Integrating with regional geology, it can be concluded that the Dunhuang area was in a transition tectonic setting between continent-continent subduction (crust thickened) and intracontinental extension during the Early Carboniferous.
学科主题	火成岩岩石学
WOS关键词	U-PB AGE ; TRONDHJEMITE-GRANODIORITE TTG ; PLASMA-MASS SPECTROMETRY ; LOWER CONTINENTAL-CRUST ; SLAB-DERIVED MELTS ; HF ISOTOPE ; NW CHINA ; TRACE-ELEMENT ; TARIM BASIN ; LU-HF
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000333224500013
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40270]
专题	中国地质调查局西安地质调查中心
作者单位	1.CGS, Xian Ctr Geol Survey, MLR, Key Lab Study Focused Magmatism & Giant Ore Depos, Xian 710054, Peoples R China 2.中国地质调查局西安地质调查中心
推荐引用方式 GB/T 7714	Zhu Tao,Wang HongLiang,Xu XueYi,et al. Discovery of adakitic rocks in south margin of Dunhuang block and its geological significance[J]. ACTA PETROLOGICA SINICA,2014,30(2):491-502.
APA	Zhu Tao.,Wang HongLiang.,Xu XueYi.,Chen JunLu.,Ma ZhongPing.,...&Li Ping.(2014).Discovery of adakitic rocks in south margin of Dunhuang block and its geological significance.ACTA PETROLOGICA SINICA,30(2),491-502.
MLA	Zhu Tao,et al."Discovery of adakitic rocks in south margin of Dunhuang block and its geological significance".ACTA PETROLOGICA SINICA 30.2(2014):491-502.