Permian A-type granites in Tarim and western part of Central Asian;Orogenic Belt (CAOB): Genetically related to a common Permian mantle;plume?

doi:10.1016/j.lithos.2013.04.001

CORC > 中国地质调查局 > 中国地质调查局 > 中国地质调查局南京地质调查中心

	Permian A-type granites in Tarim and western part of Central Asian;Orogenic Belt (CAOB): Genetically related to a common Permian mantle;plume?
	Zhang, Chuan-Lin 3; Zou, Hai-Bo
刊名	LITHOS
	2013
卷号	172 页码:47-60
关键词	Permian A-type granites Permian Tarim LIP Tarim Central Asian Orogenic Belt (CAOB)
ISSN号	0024-4937
DOI	10.1016/j.lithos.2013.04.001
英文摘要	Zircon U-Pb ages, whole-rock geochemical and zircon Hf isotope data are reported for the Permian A-type quartz syenites-granites in western Tarim Block, Northwest China. Zircon U-Pb dating indicates these alkali plutons were emplaced at 270-277 Ma. Elemental geochemistry shows their typical A-type signatures, i.e., high total alkali, HFSE, REE contents and Ga/Al, FeOtot/(FeOtot + MgO) and Nb/Y ratios. Isotopically, their epsilon Nd values vary from -2.6 to 2.0. Based on zircon Hf isotope compositions, they could be divided into two sub-groups: Group I exhibits high positive epsilon Hf(t) ranging from 3 to 11 (mostly within the range of 5 to 9), which is highly comparable with the syenites in Bachu area located just south of these plutons. Group II has epsilon Hf(t) ranging from -3 to 2. The second group exhibits comparable Nd-Hf isotope compositions with the spatially and temporally related Piqiang ultramafic-mafic complex. Integrating geological, geochemical and Nd-Hf isotope data, we suggest that the A-type syenite-granites were formed via intensive crystal fractionation from a common plume-derived parental mafic magma, coupled with variable extent of crustal contamination. Moreover, the extent of the crustal contamination increase from inner Tarim towards South Tianshan Collisional Belt.;A comprehensive synthesis of the coeval A-type granites in the western part of the Central Asian Orogenic Belt (CAOB) shows that they exhibit distinct geochemical features, e.g., large range of epsilon Nd(t) and (Sr-87/Sr-86)(i) values, high Y/Nb, Yb/Ta and low Nb/La ratios. All these features argue that they were derived from juvenile mafic crust with variable addition of the mafic materials from mantle sources and some old crustal materials or mixing of mantle-derived mafic magma with Precambrian crustal components. We suggest that both the Permian A-type granites from Tarim and western section of CAOB were genetically linked to the Permian Tarim mantle plume, which is concurrent with the two mantle domains for the Permian Tarim Large Igneous Province (UP). (C) 2013 Elsevier B.V. All rights reserved.
学科主题	火成岩岩石学
WOS关键词	LARGE IGNEOUS PROVINCE ; PHANEROZOIC CRUSTAL GROWTH ; PB ZIRCON ; GEOCHRONOLOGY ; NW CHINA ; U-PB ; TIEN-SHAN ; CONTINENTAL GROWTH ; TECTONIC ; EVOLUTION ; POSTCOLLISIONAL MAGMATISM ; SOUTHEASTERN AUSTRALIA
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000321169400004
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39952]
专题	中国地质调查局南京地质调查中心
作者单位	1.CGS, Nanjing Inst Geol & Mineral Resources, Nanjing 210016, Jiangsu, Peoples R China. 2.Auburn Univ, Dept Geol & Geog, Auburn, AL 36849 USA. 3.中国地质调查局南京地质调查中心
推荐引用方式 GB/T 7714	Zhang, Chuan-Lin,Zou, Hai-Bo. Permian A-type granites in Tarim and western part of Central Asian;Orogenic Belt (CAOB): Genetically related to a common Permian mantle;plume?[J]. LITHOS,2013,172:47-60.
APA	Zhang, Chuan-Lin,&Zou, Hai-Bo.(2013).Permian A-type granites in Tarim and western part of Central Asian;Orogenic Belt (CAOB): Genetically related to a common Permian mantle;plume?.LITHOS,172,47-60.
MLA	Zhang, Chuan-Lin,et al."Permian A-type granites in Tarim and western part of Central Asian;Orogenic Belt (CAOB): Genetically related to a common Permian mantle;plume?".LITHOS 172(2013):47-60.