Early Ordovician island arc of Qimantag Mountain, eastern Kunlun: Evidences from geochemistry, Sm-Nd isotope and geochronology of intermediate-basic igneous rocks

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	Early Ordovician island arc of Qimantag Mountain, eastern Kunlun: Evidences from geochemistry, Sm-Nd isotope and geochronology of intermediate-basic igneous rocks
	Cui, MH (Cui MeiHui); Meng, FC (Meng FanCong); Wu, XK (Wu XiangKe)
刊名	ACTA PETROLOGICA SINICA
	2011
卷号	27 期号:11 特刊 SI 页码:3365-3379
关键词	Geochemistry Sm-Nd isotope U-Pb zircon dating Intermediate-basic igneous rocks Yaziquan
ISSN号	1000-0569
英文摘要	Intermediate-basic igneous rocks, including hornblende gabbros, basalts, diorites and andesites, were found in Qimantag Group of Yaziquan area, west of Qimantag Mountain. The main geochemistry and isotope characteristics are as follows; (1) basic igneous rocks show SiO(2) 47.93% similar to 50.54%, MgO 3.40% similar to 6.24% and total Fe(FeO(T)) 11.24% similar to 14.10%, belonging to tholeiitic rocks; intermediate rocks are of SiO(2) 51.5% similar to 59.59%, MgO 2.05 similar to 6.42%, total Fe(FeO(T)) 5.65% similar to 9.38%, belonging to tholeiitic and calc-alkalic rocks; (2) REE patterns show that both basic and intermediate igneous rocks are enriched in LREEs, with (La/Yb), = 1.44 similar to 11.69; (3) Enriched in LILEs (like Sr, Ba, Th, U) and depleted in HFSEs (P, Zr, Ti), especially Nb and Ta negative anomaly; (4) epsilon(Nd) (t = 480Ma) is from +1.1 to +7.9, showing that they were contaminated with subducted crustal materials. The characteristics above show that these intermediate-basic igneous rocks formed in an island arc setting. Zircon U-Pb dating for a dimite sample yields ages of 480 +/- 3Ma, representing the rock forming age. Indicating that the Qimantag oceanic basin already exist in Early Ordovician and began subducting then, leading to the formation of island arc igneous rocks in Yaziquan.
学科主题	变质岩岩石学
WOS关键词	TECTONIC IMPLICATIONS ; OCEANIC BASALTS ; OPHIOLITE ; CHINA ; EVOLUTION ; DISCRIMINATION ; CLASSIFICATION ; IDENTIFICATION ; PLATEAU ; DIAGRAM
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000297822900017
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39336]
专题	中国地质调查局
作者单位	China Univ Geosci, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Cui, MH ,Meng, FC ,Wu, XK . Early Ordovician island arc of Qimantag Mountain, eastern Kunlun: Evidences from geochemistry, Sm-Nd isotope and geochronology of intermediate-basic igneous rocks[J]. ACTA PETROLOGICA SINICA,2011,27(11 特刊 SI):3365-3379.
APA	Cui, MH ,Meng, FC ,&Wu, XK .(2011).Early Ordovician island arc of Qimantag Mountain, eastern Kunlun: Evidences from geochemistry, Sm-Nd isotope and geochronology of intermediate-basic igneous rocks.ACTA PETROLOGICA SINICA,27(11 特刊 SI),3365-3379.
MLA	Cui, MH ,et al."Early Ordovician island arc of Qimantag Mountain, eastern Kunlun: Evidences from geochemistry, Sm-Nd isotope and geochronology of intermediate-basic igneous rocks".ACTA PETROLOGICA SINICA 27.11 特刊 SI(2011):3365-3379.