Late Jurassic A-type granite from the Dalai region of central Inner Mongolia: Geochemistry, petrogenesis and tectonic implication

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 岩石圈演化国家重点实验室

	Late Jurassic A-type granite from the Dalai region of central Inner Mongolia: Geochemistry, petrogenesis and tectonic implication
	Xue FuHong 1,2,3; Zhang XiaoHui 1; Deng JiangXia 1,2; Yuan LingLing 1,2
刊名	ACTA PETROLOGICA SINICA
	2015-06-01
卷号	31 期号:6 页码:1774-1788
关键词	A-type granite Late Jurassic Geochemistry Petrogenesis Central Inner Mongolia
文献子类	Article
英文摘要	A-type granitoids constitute volumetrically minor but genetically important building blocks of most post-Archean continental landmasses on Earth and their diversified genesis encapsulates key information for ascertaining critical geodynamic controls on continental crustal formation and differentiation. This SIMS zircon U-Pb dating and geochemical study documents the late Jurassic K-feldspar granites from the Dalai region of central Inner Mongolia. The granites show an A-type magmatic affinity, with typical enrichment in alkalis, Ga, Zr, Nb and Y, depletion in Sr and P and fractionated REE patterns showing strong negative Eu anomalies. They exhibit initial Sr-87/Sr-86 ratio of 0.7050 to 0. 7052, epsilon(Nd) (t) of + 2. 1 to + 2. 3, zircon epsilon(Hf)( t) from + 7. 0 to + 11.5 and delta O-18 values from 6. 7 parts per thousand to 7. 6 parts per thousand . These elemental and isotopic characters argue for parental magmas from partial melting of a newly unperplated intermediate to mafic crustal protolith and their subsequent fractional crystallization. Together with other coeval A-type intrusions widely scattered across the northern China-Mongolia tract, the Dalaimiao A-type granite testified to an episode of diffusive middle-lower crustal extension during Middle-Late Jurassic, distinct from large-scale upper crustal extention during Early Cretaceous time. Such near-synchronous two-stage extensional pattern across the NE continental Asia accords well with the post-collisional gravitational collapse associated with the northern Mongol-Okhotsk suture in the Jurassic.
WOS关键词	NORTH CHINA CRATON ; ASIAN OROGENIC BELT ; METAMORPHIC CORE COMPLEXES ; SIERRA-NEVADA BATHOLITH ; ALKALINE VOLCANIC-ROCKS ; I-TYPE GRANITES ; HF-O ISOTOPES ; U-PB AGES ; SOUTHEASTERN AUSTRALIA ; CONTINENTAL GROWTH
WOS研究方向	Geology
语种	英语
WOS记录号	WOS:000357547700020
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/62347]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Inner Mongolia Nonferrous Geol Min Ltd Liabil Co, Hohhot 010010, Peoples R China
推荐引用方式 GB/T 7714	Xue FuHong,Zhang XiaoHui,Deng JiangXia,et al. Late Jurassic A-type granite from the Dalai region of central Inner Mongolia: Geochemistry, petrogenesis and tectonic implication[J]. ACTA PETROLOGICA SINICA,2015,31(6):1774-1788.
APA	Xue FuHong,Zhang XiaoHui,Deng JiangXia,&Yuan LingLing.(2015).Late Jurassic A-type granite from the Dalai region of central Inner Mongolia: Geochemistry, petrogenesis and tectonic implication.ACTA PETROLOGICA SINICA,31(6),1774-1788.
MLA	Xue FuHong,et al."Late Jurassic A-type granite from the Dalai region of central Inner Mongolia: Geochemistry, petrogenesis and tectonic implication".ACTA PETROLOGICA SINICA 31.6(2015):1774-1788.