In situ zircon U-Pb, oxygen and hafnium isotopic compositions of Jurassic granites from the North China craton: Evidence for Triassic subduction of continental crust and subsequent metamorphism-related O-18 depletion

doi:10.1016/j.lithos.2012.02.018

	In situ zircon U-Pb, oxygen and hafnium isotopic compositions of Jurassic granites from the North China craton: Evidence for Triassic subduction of continental crust and subsequent metamorphism-related O-18 depletion
	Jiang, Neng; Chen, Jingzhi; Guo, Jinghui; Chang, Guohu
刊名	LITHOS
	2012-06-01
卷号	142 页码:84-94
关键词	Granite Continental subduction Low delta O-18 zircons O-18 depletion Source heterogeneity
ISSN号	0024-4937
DOI	10.1016/j.lithos.2012.02.018
文献子类	Article
英文摘要	Six samples of the Linglong granitic pluton from the southeastern margin of the North China craton yield similar Jurassic magmatic zircon U-Pb ages and evolved whole-rock Sr-Nd isotopic compositions. They are weakly peraluminous to strongly peraluminous, with A/CNK (molar Al2O3/[CaO + Na2O + K2O]) ratios of 1.05 to 1.3 except one sample with an A/CNK of 0.98. However, they have contrasting inherited zircon ages and magmatic zircon Hf and O isotopic compositions. Two samples have similar to 2.5 Ga inherited zircons and high delta O-18 magmatic zircons and are interpreted to be derived dominantly from the lower crust of the North China craton. Another two samples with dominantly Triassic inherited zircons and low delta O-18 magmatic zircons are considered to be derived mainly from the subducted continental crust of the South China craton and the source was considered to be significantly depleted in O-18 during Triassic metamorphism. The rest two samples have dominantly Neoproterozoic inherited zircons and intermediate delta O-18 magmatic zircons and are also considered to be derived mainly from the subducted continental crust of the South China craton. But the source was not significantly depleted in O-18 during Triassic metamorphism. The different lithologies, whole-rock epsilon(Nd(t)) and zircon epsilon(Hf(t)) between the samples also strongly support that they are derived from different sources. Although magmatic zircons from the six samples have variable delta O-18 from 0.7 to 8.5 parts per thousand and epsilon(Hf(t)) from -27.6 to -11.8, individual samples have more limited epsilon(Hf(t)) and delta O-18. The delta O-18 and epsilon(Hf(t)) of magmatic zircons from the samples indicate no contribution of mantle- derived magmas to the Linglong granites. This is supported by the fact of no coeval mantle-derived rocks in the region. The results suggest that large variations of epsilon(Hf(t)) and delta O-18 do not necessarily indicate mixing between mantle- and crustal-derived magmas. Instead, they may reflect heterogeneity in the source. The granites are interpreted to result from partial melting of the thickened crust caused by Triassic subduction of the South China craton continental crust beneath the North China craton. Subsequent lithospheric extension and orogenic collapse are the most likely mechanism for the granites. (C) 2012 Elsevier B.V. All rights reserved.
WOS关键词	ULTRAHIGH-PRESSURE TERRANE ; NORTHWESTERN JIAODONG PENINSULA ; FLUID-ROCK INTERACTIONS ; SULU OROGENIC BELT ; HF-O ISOTOPES ; EASTERN CHINA ; DABIE-SHAN ; SOUTH-KOREA ; LU-HF ; POSTCOLLISIONAL GRANITOIDS
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000304725500006
资助机构	Chinese Ministry of Science and Technology(2009CB825005) ; Chinese Ministry of Science and Technology(2009CB825005) ; Chinese Ministry of Science and Technology(2009CB825005) ; Chinese Ministry of Science and Technology(2009CB825005) ; National Natural Science Foundation of China(90914008) ; National Natural Science Foundation of China(90914008) ; National Natural Science Foundation of China(90914008) ; National Natural Science Foundation of China(90914008) ; Chinese Ministry of Science and Technology(2009CB825005) ; Chinese Ministry of Science and Technology(2009CB825005) ; Chinese Ministry of Science and Technology(2009CB825005) ; Chinese Ministry of Science and Technology(2009CB825005) ; National Natural Science Foundation of China(90914008) ; National Natural Science Foundation of China(90914008) ; National Natural Science Foundation of China(90914008) ; National Natural Science Foundation of China(90914008) ; Chinese Ministry of Science and Technology(2009CB825005) ; Chinese Ministry of Science and Technology(2009CB825005) ; Chinese Ministry of Science and Technology(2009CB825005) ; Chinese Ministry of Science and Technology(2009CB825005) ; National Natural Science Foundation of China(90914008) ; National Natural Science Foundation of China(90914008) ; National Natural Science Foundation of China(90914008) ; National Natural Science Foundation of China(90914008) ; Chinese Ministry of Science and Technology(2009CB825005) ; Chinese Ministry of Science and Technology(2009CB825005) ; Chinese Ministry of Science and Technology(2009CB825005) ; Chinese Ministry of Science and Technology(2009CB825005) ; National Natural Science Foundation of China(90914008) ; National Natural Science Foundation of China(90914008) ; National Natural Science Foundation of China(90914008) ; National Natural Science Foundation of China(90914008)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/84334]
专题	中国科学院地质与地球物理研究所
通讯作者	Jiang, Neng
作者单位	Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Jiang, Neng,Chen, Jingzhi,Guo, Jinghui,et al. In situ zircon U-Pb, oxygen and hafnium isotopic compositions of Jurassic granites from the North China craton: Evidence for Triassic subduction of continental crust and subsequent metamorphism-related O-18 depletion[J]. LITHOS,2012,142:84-94.
APA	Jiang, Neng,Chen, Jingzhi,Guo, Jinghui,&Chang, Guohu.(2012).In situ zircon U-Pb, oxygen and hafnium isotopic compositions of Jurassic granites from the North China craton: Evidence for Triassic subduction of continental crust and subsequent metamorphism-related O-18 depletion.LITHOS,142,84-94.
MLA	Jiang, Neng,et al."In situ zircon U-Pb, oxygen and hafnium isotopic compositions of Jurassic granites from the North China craton: Evidence for Triassic subduction of continental crust and subsequent metamorphism-related O-18 depletion".LITHOS 142(2012):84-94.