Geochronology and petrogenesis of the Gaositai Cr-bearing ultramafic;complex, Hebei Province, China

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	Geochronology and petrogenesis of the Gaositai Cr-bearing ultramafic;complex, Hebei Province, China
	Li LiXing 4; Li HouMin ; Cui YanHe ; Zhu MingYu ; Wang DeZhong ; Yang XiuQing ; Liu MingJun ; Chen Jing
刊名	ACTA PETROLOGICA SINICA
	2012
卷号	28 期号:11 页码:3757-3771
关键词	Chromite Late Triassic Ultramafic rocks Gaositai North China Craton
ISSN号	057OJ
英文摘要	Located in the northern margin of the North China Craton (NCC), the concentric zoning Gaositai ultramafic complex show features of chromite-bearing dunite in the core, surrounded subsequently by wehrlite and clinopyroxenite, and minor hornblendite in the rim. Chemically, the Gaositai ultramafic complex display systematic decrease of Mg-#, negatively sloped REE patterns with no Eu anomalies and high LILEs with low HFSEs such as Nb and Zr from core to rim, implying a fractional crystallization trend during magma evolution. LA-ICP-MS zircon U-Pb ages of three chromite samples and one clinopyroxenite sample show that emplacement of the Gaositai ultramafic complex was 213 +/- 1Ma, which occurred in Late Triassic, implying the geodynamic setting of lithospheric extension after final collision of the Mongolian arc terranes in the NCC. The epsilon(Hf)(t) values of the zircons aged from 214Ma to 211Ma for the clinopyroxenite range form -2.0 to +1.6, implying that the parental magma was derived from a mixed source composed of depleted mantle source and enriched lithospheric mantle source, with significant crustal contamination during its ascending. Inherited zircons were widespread in the Gaositai ultramafic complex, with ages from 2800Ma to 244Ma. Four groups were detected; 2.6 similar to 2.5Ga, 400 similar to 360Ma, 300 similar to 280Ma and 244Ma, recording Neoarchaean, Middle Devonian, Early Permain and Late Permain-Middle Triassic magmatism in the northern margin of the NCC.
学科主题	火成岩岩石学
WOS关键词	CRUST-MANTLE INTERACTION ; ALASKAN-TYPE COMPLEX ; U-PB AGE ; NORTH CHINA ; SM-ND ; ISOTOPIC COMPOSITION ; SYENITE COMPLEX ; LASER-ABLATION ; EASTERN ; HEBEI ; LU-HF
WOS研究方向	Geology
语种	中文
WOS记录号	WOS:000312572600024
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39542]
专题	中国地质科学院矿产资源研究所
作者单位	1.Chinese Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China. 2.Hebei Geol & Min Bur, Geol Team 4, Chengde 067000, Peoples R China. 3.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China. 4.中国地质科学院矿产资源研究所
推荐引用方式 GB/T 7714	Li LiXing,Li HouMin,Cui YanHe,et al. Geochronology and petrogenesis of the Gaositai Cr-bearing ultramafic;complex, Hebei Province, China[J]. ACTA PETROLOGICA SINICA,2012,28(11):3757-3771.
APA	Li LiXing.,Li HouMin.,Cui YanHe.,Zhu MingYu.,Wang DeZhong.,...&Chen Jing.(2012).Geochronology and petrogenesis of the Gaositai Cr-bearing ultramafic;complex, Hebei Province, China.ACTA PETROLOGICA SINICA,28(11),3757-3771.
MLA	Li LiXing,et al."Geochronology and petrogenesis of the Gaositai Cr-bearing ultramafic;complex, Hebei Province, China".ACTA PETROLOGICA SINICA 28.11(2012):3757-3771.