The genesis of early Carboniferous adakitic rocks at the southern margin of the Alxa Block, North China

doi:10.1016/j.lithos.2017.01.012

	The genesis of early Carboniferous adakitic rocks at the southern margin of the Alxa Block, North China
	Xue, Shuo 1,2,5; Ling, Ming-Xing 1,4; Liu, Yu-Long 2; Zhang, Hong 3; Sun, Weidong2,4,6
	2017-05-01
发表期刊	LITHOS
卷号	278 页码:181-194
文章类型	Article
摘要	Adakite is a highly debated petrologic term that was originally proposed to describe igneous rocks formed by slab melting. Subsequent studies reported other ways to generate adakitic signatures such as the melting of mafic lower continental crust and fractional crystallization of basaltic magma. We studied adakitic rocks from the Taohuala Mountain at the southern margin of the Alxa Block, North China. These rocks are characterized by high Sr concentrations (300-450 ppm), high Sr/Y (20-75 ppm) and (La/Yb)(N) (25-67 ppm) ratios, and low Y (<18 ppm) and Yb (<1.9 ppm) concentrations, which are typical of adakite. The distribution of these data on a Sr/Y versus (La/Yb)N discrimination diagram, combined with their high (Sr-87/Sr-86); ratios (0.7113-0.7131) and low epsilon(Nd)(t) (-15.8 to 16.8) and epsilon(Hf)(t) (-18 to 10) values of zircon, indicates that the adakitic rocks formed by partial melting of thickened continental crust. U-Pb dating of zircons using LA-ICP-MS yields an early Carboniferous age of 330 +/- 5 Ma. The ages and spatial distribution of magmatic rocks indicate that the Paleo-Asian oceanic crust subducted towards the Alxa Block in the late Paleozoic. Subsequently, northward slab rollback occurred during the Carboniferous. Therefore, we propose that the adakitic rocks from the Taohuala Mountain formed by partial melting of previously thickened lower continental crust, induced by the upwelling of asthenospheric mantle during slab rollback. (C) 2017 Elsevier B.V. All rights reserved.
关键词	Adakitic Rock Lower Continental Crust Subduction Alxa Block Sr-nd-hf Isotopes Slab Rollback
DOI	10.1016/j.lithos.2017.01.012
收录类别	SCI
语种	英语
WOS记录号	WOS:000399258500013
引用统计	被引频次：35[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
版本	出版稿
条目标识符	http://ir.qdio.ac.cn/handle/337002/137041
专题	深海极端环境与生命过程研究中心
作者单位	1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China 2.Chinese Acad Sci, CAS Key Lab Mineral & Metallogeny, Guangzhou Inst Geochem, Guangzhou 510640, Guangdong, Peoples R China 3.Northwest Univ Xian, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China 4.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100094, Peoples R China 6.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China
推荐引用方式 GB/T 7714	Xue, Shuo,Ling, Ming-Xing,Liu, Yu-Long,et al. The genesis of early Carboniferous adakitic rocks at the southern margin of the Alxa Block, North China[J]. LITHOS,2017,278:181-194.
APA	Xue, Shuo,Ling, Ming-Xing,Liu, Yu-Long,Zhang, Hong,&Sun, Weidong.(2017).The genesis of early Carboniferous adakitic rocks at the southern margin of the Alxa Block, North China.LITHOS,278,181-194.
MLA	Xue, Shuo,et al."The genesis of early Carboniferous adakitic rocks at the southern margin of the Alxa Block, North China".LITHOS 278(2017):181-194.

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