Geochronology, geochemistry and petrogenesis of the late Palaeoproterozoic A-type granites from the Dunhuang block, SE Tarim Craton, China: implications for the break-up of the Columbia supercontinent

doi:10.1017/S0016756813000538

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	Geochronology, geochemistry and petrogenesis of the late Palaeoproterozoic A-type granites from the Dunhuang block, SE Tarim Craton, China: implications for the break-up of the Columbia supercontinent
	Yu, Sheng-Yao 7; Zhang, Jian-Xin ; Zhao, Xi-Lin ; Gong, Jiang-Hua ; Li, Yun-Shuai
刊名	GEOLOGICAL MAGAZINE
	2014
卷号	151 期号:4 页码:629-648
关键词	Tarim Craton Dunhuang block A-type granite Columbia supercontinent breakup
ISSN号	0016-7568
DOI	10.1017/S0016756813000538
英文摘要	The discovery of c. 1.77 Ga A-type granite in the Tarim Craton (TC) provides the first evidence that supports an extensional event related to fragmentation of the Columbia supercontinent in the late Palaeoproterozoic. We present laser-ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) zircon U-Pb ages, Lu-Hf isotopic data and the whole-rock geochemical and Nd isotopic data of A-type granites in the Dunhuang area in the SE Tarim Craton. Zircon U-Pb dating for three granite samples indicate that they were emplaced at c. 1.77 Ga. Zircons from these granites have epsilon(Hf)(t) values ranging from -5.9 to 8.7, corresponding to two-stage model ages of 1.9-2.7 Ga. These granites exhibit the following petrological geochemical characteristics that are typical of A- type granite: ( a) high content of SiO2 and alkalis (i. e. high K2O + Na2O with K2O/Na2O > 1), enrichment of high-fieldstrength elements (HFSE) and rare Earth elements (REE) (except for Eu) and extreme depletion of Ba, Sr, P, Ti and Eu; (b) 10 000xGa/Al ratios in the Dunhuang granites of 3.5-4.4, with an average value of 3.79 which is similar to the global average of 3.75 for A-type granites; (c) the presence of characteristic minerals such as amphibole, sphene and perthite; and (d) zirconium saturation temperature results indicate that the Dunhuang granites have high initial magmatic temperatures in the range 887- 950 degrees C, similar to those of typical of A-type granites. Whole-rock epsilon(Nd)(t) values range from -2.5 to -6.2 and T-DM model ages from 2.3 to 2.7 Ga. Nd-Hf isotopic and whole-rock geochemical data indicate that these granites were most likely derived from the late Archean crustal source in a post-collisional/postorogenic extensional tectonic environment. The late Palaeoproterozoic A- type granites in the TC could be correlated with those of the North China Craton (NCC), India and the Canadian Shield, thus demonstrating extensional tectonics and break-up of the Columbia supercontinent.
学科主题	火成岩岩石学
WOS关键词	PB ZIRCON GEOCHRONOLOGY ; ULTRAHIGH-PRESSURE METAMORPHISM ; KHETRI COPPER BELT ; NORTH-CHINA ; NW CHINA ; PALEOPROTEROZOIC EVOLUTION ; TECTONIC IMPLICATIONS ; HF ISOTOPE ; SOUTH CHINA ; MAFIC DYKES
WOS研究方向	Geology
语种	英语
出版者	CAMBRIDGE UNIV PRESS
WOS记录号	WOS:000337751000005
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40571]
专题	中国地质调查局南京地质调查中心
作者单位	1.[Yu, Sheng-Yao 2.Zhang, Jian-Xin 3.Gong, Jiang-Hua 4.Chinese Acad Geol Sci, Inst Geol, State Key Lab Continental Tecton & Dynam, Beijing 100037, Peoples R China 5.[Zhang, Jian-Xin 6.Nanjing Inst Geol & Mineral Resources, Nanjing 210016, Jiangsu, Peoples R China 7.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Yu, Sheng-Yao,Zhang, Jian-Xin,Zhao, Xi-Lin,et al. Geochronology, geochemistry and petrogenesis of the late Palaeoproterozoic A-type granites from the Dunhuang block, SE Tarim Craton, China: implications for the break-up of the Columbia supercontinent[J]. GEOLOGICAL MAGAZINE,2014,151(4):629-648.
APA	Yu, Sheng-Yao,Zhang, Jian-Xin,Zhao, Xi-Lin,Gong, Jiang-Hua,&Li, Yun-Shuai.(2014).Geochronology, geochemistry and petrogenesis of the late Palaeoproterozoic A-type granites from the Dunhuang block, SE Tarim Craton, China: implications for the break-up of the Columbia supercontinent.GEOLOGICAL MAGAZINE,151(4),629-648.
MLA	Yu, Sheng-Yao,et al."Geochronology, geochemistry and petrogenesis of the late Palaeoproterozoic A-type granites from the Dunhuang block, SE Tarim Craton, China: implications for the break-up of the Columbia supercontinent".GEOLOGICAL MAGAZINE 151.4(2014):629-648.