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The genesis of early Carboniferous adakitic rocks at the southern margin of the Alxa Block, North China
Xue, Shuo1,2,5; Ling, Ming-Xing1,4; Liu, Yu-Long2; Zhang, Hong3; 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
DOI10.1016/j.lithos.2017.01.012
收录类别SCI
语种英语
WOS记录号WOS:000399258500013
引用统计
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
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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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