Early Silurian (similar to 440 Ma) adakitic, andesitic and Nb-enriched basaltic lavas in the southern Altay Range, Northern Xinjiang (western China): Slab melting and implications for crustal growth in the Central Asian Orogenic Belt

doi:10.1016/j.lithos.2014.07.024

	Early Silurian (similar to 440 Ma) adakitic, andesitic and Nb-enriched basaltic lavas in the southern Altay Range, Northern Xinjiang (western China): Slab melting and implications for crustal growth in the Central Asian Orogenic Belt
	Shen, Xiao-Ming 1,2; Zhang, Hai-Xiang 1; Wang, Qiang 1; Ma, Lin 1; Yang, Yue-Heng 3
刊名	LITHOS
	2014-10-01
卷号	206 页码:234-251
关键词	Adakites Nb-enriched basaltic rocks Slab tearing Crustal growth Altay Range Central Asian Orogenic Belt
ISSN号	0024-4937
DOI	10.1016/j.lithos.2014.07.024
文献子类	Article
英文摘要	As an important part of the Central Asian Orogenic Belt (CAOB), the Altay Range contains large-scale Paleozoic magmatic rocks. However, owing to the lack of precise age constraints, the tectonic setting and petrogenesis of the magmatic rocks in this area have been controversial, which has led to the debate on Phanerozoic crustal growth mechanisms and accretionary orogenic processes in the CAOB. Herein, we report geochronological and geochemical data of the Suoerkuduke adakitic, andesitic and Nb-enriched basaltic (NEB) lavas in the southern margin of the southern Altay Range. LA-ICP-MS zircon U-Pb analyses for five adakitic, andesitic and NEB samples indicate that they were coevally generated in the Early Silurian (similar to 440 Ma). The adakites and basaltic andesites are geochemically characterized by high Na2O/K2O, Sr/Y, Al2O3, Sr, epsilon(Nd)(t) and zircon epsilon(Hf)(t) values and relatively low (Sr-87/Sr-86)(i) ratios. The NEBs are sodium-rich and have higher TiO2, P2O5, Zr, Nb, and Nb/U values than those of typical arc basalts. They also have positive epsilon(Nd)(t) values and positive and variable zircon epsilon(Hf)(t) values. We suggest that the Suoerkuduke adakites were derived by a partial melting of the subducted oceanic crust with minor overlying sediments, and the continuous compositional variations between adakites and basaltic andesites confirm that the interaction between slab melts and mantle peridotite played an important role in the formation of basaltic andesites. The associated NEBs were possibly generated by a partial melting of mantle wedge peridotites metasomatized by slab-derived adakitic melts and minor fluids. In combination with the occurrence of voluminous Silurian-Devonian granitoids, coeval ophiolite melanges, and a series of intra-arc basins, a slab window model triggered by slab tearing is proposed to account for the formation of the Suoerkuduke adakite-basaltic andesite-NEB suites. The upwelling of the asthenospheric mantle through the slab window probably caused significant extension in the overlying lithosphere; extensive melting of the subducted oceanic crust, mantle and juvenile lower crust; and intense interaction between slab-derived melts or fluids and the mantle wedge. Slab tearing and subsequent asthenospheric upwelling possibly played an important role in the crustal growth of the CAOB during the Phanerozoic. (C) 2014 Elsevier B.V. All rights reserved.
WOS关键词	STRENGTH ELEMENT ENRICHMENT ; PALEOZOIC TECTONIC HISTORY ; SPREADING RIDGE SUBDUCTION ; LOWER CONTINENTAL-CRUST ; ISLAND-ARC MANTLE ; ZIRCON U-PB ; MAGNESIAN ANDESITES ; BAJA-CALIFORNIA ; NW CHINA ; VOLCANIC-ROCKS
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000343336100015
资助机构	Chinese Academy of Sciences(XDB03010600) ; Chinese Academy of Sciences(XDB03010600) ; National Natural Science Foundation of China(41025006 ; National Natural Science Foundation of China(41025006 ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project)(Y234021001) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project)(Y234021001) ; Basic Research Business Foundation of China Earthquake Administration(ZDJ2012-02) ; Basic Research Business Foundation of China Earthquake Administration(ZDJ2012-02) ; 41203044) ; 41203044) ; Chinese Academy of Sciences(XDB03010600) ; Chinese Academy of Sciences(XDB03010600) ; National Natural Science Foundation of China(41025006 ; National Natural Science Foundation of China(41025006 ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project)(Y234021001) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project)(Y234021001) ; Basic Research Business Foundation of China Earthquake Administration(ZDJ2012-02) ; Basic Research Business Foundation of China Earthquake Administration(ZDJ2012-02) ; 41203044) ; 41203044) ; Chinese Academy of Sciences(XDB03010600) ; Chinese Academy of Sciences(XDB03010600) ; National Natural Science Foundation of China(41025006 ; National Natural Science Foundation of China(41025006 ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project)(Y234021001) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project)(Y234021001) ; Basic Research Business Foundation of China Earthquake Administration(ZDJ2012-02) ; Basic Research Business Foundation of China Earthquake Administration(ZDJ2012-02) ; 41203044) ; 41203044) ; Chinese Academy of Sciences(XDB03010600) ; Chinese Academy of Sciences(XDB03010600) ; National Natural Science Foundation of China(41025006 ; National Natural Science Foundation of China(41025006 ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project)(Y234021001) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project)(Y234021001) ; Basic Research Business Foundation of China Earthquake Administration(ZDJ2012-02) ; Basic Research Business Foundation of China Earthquake Administration(ZDJ2012-02) ; 41203044) ; 41203044)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/86084]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhang, Hai-Xiang
作者单位	1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China 2.China Earthquake Adm, Inst Crustal Dynam, Key Lab Crustal Dynam, Beijing 100085, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Shen, Xiao-Ming,Zhang, Hai-Xiang,Wang, Qiang,et al. Early Silurian (similar to 440 Ma) adakitic, andesitic and Nb-enriched basaltic lavas in the southern Altay Range, Northern Xinjiang (western China): Slab melting and implications for crustal growth in the Central Asian Orogenic Belt[J]. LITHOS,2014,206:234-251.
APA	Shen, Xiao-Ming,Zhang, Hai-Xiang,Wang, Qiang,Ma, Lin,&Yang, Yue-Heng.(2014).Early Silurian (similar to 440 Ma) adakitic, andesitic and Nb-enriched basaltic lavas in the southern Altay Range, Northern Xinjiang (western China): Slab melting and implications for crustal growth in the Central Asian Orogenic Belt.LITHOS,206,234-251.
MLA	Shen, Xiao-Ming,et al."Early Silurian (similar to 440 Ma) adakitic, andesitic and Nb-enriched basaltic lavas in the southern Altay Range, Northern Xinjiang (western China): Slab melting and implications for crustal growth in the Central Asian Orogenic Belt".LITHOS 206(2014):234-251.