...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Asian earth sciences >Petrology and geochemistry of late Carboniferous hornblende gabbro from the Awulale Mountains, western Tianshan (NW China): Implication for an arc-nascent back-arc environment
【24h】

Petrology and geochemistry of late Carboniferous hornblende gabbro from the Awulale Mountains, western Tianshan (NW China): Implication for an arc-nascent back-arc environment

机译：天山西部Awulale山石炭纪hornblende gabbro晚期的岩石学和地球化学（中国西北地区）：对新生弧后弧环境的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Awulale Mountains, the conjunction point of the Tarim Plate, Junggar Plate and Yili-Central Tianshan Block, are the crucial place to decipher the tectonic evolution of the western Tianshan. We report results of petrologic, whole-rock geochemical, Sr-Nd isotopic data and in-situ zircon U-Pb and Hf isotopes for the Wuling (poikilitic) hornblende gabbro from the Awulale Mountains, western Tianshan. Two stage crystallization processes are applied to interpret its mineral composition. Zircon U-Pb ages indicate that the Wuling hornblende gabbro was emplaced during the late Carboniferous (313 Ma +/- 3 Ma). The Wuling hornblende gabbro is characterized by tholeiitic affinity with low Sr-87/Sr-86 ratios, positive epsilon(Nd)(t)and zircon epsilon(Hf)(t) values, resembling its coeval mafic rocks in the Awulale Mountains. They are enriched in large ion lithophile elements (LILEs) and depleted in high field strength elements (HFSEs), indicating a subduction-related setting for their generation and their mantle source were mainly fluxed by fluids released by the down-going slab. The flat REE and depleted Sr-Nd-Hf isotopic signatures imply a shallow and heterogeneous mantle source with the involvement of a deep MORB-like component. We propose that an arc-nascent back-arc system had been developed between the Nalati Mountains and the Awulale Mountains during the late Carboniferous, where the magma derived from decompression melting of MORB-like mantle caused by the slab roll-back and flux-induced melting of mantle wedge were both contributed to their generation. The arc-type features of them were inherited from the strong subduction input at the initiation of back-arc rifting. However, the back-arc rifting ceased at the end of late Carboniferous because of the compressional stress from the collision between the Tarim Plate and the Yili-Central Tianshan Block. (c) 2015 Published by Elsevier Ltd.
机译：塔里木板块，准gar尔板块和伊犁中央天山地块的交汇点-阿乌拉勒山，是解读西天山构造演化的重要场所。我们报告了来自西天山阿乌拉勒山的武陵（多硅质）角闪石辉长岩的岩石学，全岩地球化学，Sr-Nd同位素数据和原位锆石U-Pb和Hf同位素的结果。采用两步结晶过程来解释其矿物成分。锆石的U-Pb年龄表明，五灵角闪石长辉石是在石炭纪晚期（313 Ma +/- 3 Ma）期间发生的。武陵角闪闪长辉岩的特点是具有亲和力，具有低Sr-87 / Sr-86比率，正ε（Nd）（t）和锆石ε（Hf）（t）值，类似于其在Awulale山中的中世纪镁铁质岩石。它们富含大型的离子亲石元素（LILE），而贫乏的高场强元素（HFSE），表明它们与俯冲有关的环境，其地幔源主要受到下沉平板释放的流体的影响。平坦的稀土元素和贫化的Sr-Nd-Hf同位素特征暗示着浅而异质的地幔源，并伴有类似MORB的深层成分。我们建议在石炭纪晚期在纳拉提山脉和阿乌拉莱山脉之间建立起弧新生的弧后系统，其中岩浆源于板坯回滚和磁通感应引起的MORB状地幔的减压融化。地幔楔的融化都促进了它们的产生。它们的弧型特征是从弧后裂谷开始时强烈的俯冲作用继承而来的。然而，由于塔里木板块与伊犁-中天山块体碰撞产生的压应力，后弧裂陷在石炭纪晚期终止。 （c）2015年由Elsevier Ltd.发布。

著录项

  • 来源
    《Journal of Asian earth sciences》 |2015年第1期|218-237|共20页
  • 作者

    Yan Shuang; Shan Qiang; Niu He-Cai; Yang Wu-Bin; Li Ning-Bo; Zeng Ling-Jun; Jiang Yu-Hang;

  • 作者单位

    Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangzhou 510640, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangzhou 510640, Peoples R China;

    Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangzhou 510640, Peoples R China;

    Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangzhou 510640, Peoples R China;

    Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangzhou 510640, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangzhou 510640, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangzhou 510640, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Hornblende gabbro; Awulale Mountains; South Tianshan Ocean subduction; Nascent back-arc environment; CAOB;

    机译：Hornblende gabbro;Awulale山;南天山大洋俯冲;新生的弧后环境;CAOB;

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号