...
  • 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 >Geochronology, geochemistry and Sr-Nd-Hf isotopes of mafic dikes in the Huicheng Basin: Constraints on intracontinental extension of the Qinling orogen
【24h】

Geochronology, geochemistry and Sr-Nd-Hf isotopes of mafic dikes in the Huicheng Basin: Constraints on intracontinental extension of the Qinling orogen

机译：会城盆地镁铁质堤的年代学，地球化学和Sr-Nd-Hf同位素：秦岭造山带陆内扩展的约束

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 diabase dikes intruded the Lower Cretaceous sandstone in the Huicheng Basin are key to understanding the Mesozoic tectonic evolution of the Qinling orogen. LA-ICP-MS zircon U-Pb dating yields a crystallization age of 107 +/- 1 Ma for them. The dikes have low contents of SiO2 (42.46-50.16 wt.%), MgO (3.47-5.59 wt.%) with low Mg-# of 49-59, and TiO2 (1.35-1.63 wt.%), high TFe2O3 (8.15-936 wt.%), Al2O3 (14.75-17.23 wt.%) and K2O (0.87-3.61 wt.%). Their Ni and Cr contents are in range of 16.8-111 and 45.7-315 ppm, respectively. They are significantly enriched in light rare earth elements and large ion lithophile elements (e.g., Cs, Pb and Ba), and depleted in Rb, K, P, and Ti. The dikes show relatively high whole-rock initial Sr-87/Sr-86 ratios (0.7071-0.7079) and negative epsilon(Nd) (t) values (-1.5 to -4.8) with single-stage Nd model ages of 941-1186 Ma. In addition, they have low zircon epsilon(Hf) (t) values (-8.6 to +3.5) with single-stage Hf model ages of 674-1117 Ma. Both elemental and isotopic geochemistry suggests that the magma of these dikes has undergone significant crystallization fractionation of olivine and pyroxene but weak crustal contamination during magma evolution. They were derived from partial melting of an enriched lithospheric mantle source. Together with regional geological data, these results suggest that the Qinling orogen experienced an intracontinental extension during the late Early Cretaceous. (C) 2014 Elsevier Ltd. All rights reserved.
机译：辉成盆地下白垩统砂岩侵入的辉绿岩堤是了解秦岭造山带中生代构造演化的关键。 LA-ICP-MS锆石U-Pb测年的结晶年龄为107 +/- 1 Ma。堤坝的SiO2（42.46-50.16 wt。％），MgO（3.47-5.59 wt。％），Mg-＃为49-59的低含量和TiO2（1.35-1.63 wt。％），高TFe2O3（8.15）含量低-936重量％），Al2O3（14.75-17.23重量％）和K2O（0.87-3.61重量％）。它们的Ni和Cr含量分别在16.8-111和45.7-315ppm的范围内。它们显着富含轻稀土元素和大离子亲石元素（例如Cs，Pb和Ba），并且贫化了Rb，K，P和Ti。堤防显示出较高的整岩初始Sr-87 / Sr-86比率（0.7071-0.7079）和负ε（Nd）（t）值（-1.5至-4.8），单阶段Nd模型年龄为941-1186嘛。此外，它们的锆石ε（hf）（t）值较低（-8.6至+3.5），单级Hf模型年龄为674-1117 Ma。元素地球化学和同位素地球化学都表明，这些堤防的岩浆经历了橄榄石和辉石的显着结晶分馏，但是在岩浆演化过程中地壳污染较弱。它们来自富集的岩石圈地幔源的部分熔融。结合区域地质数据，这些结果表明秦岭造山带在白垩纪晚期经历了陆内扩张。 （C）2014 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Journal of Asian earth sciences》 |2015年第15期|115-126|共12页
  • 作者

    Li Wei; Dong Yunpeng; Guo Anlin; Liu Xiaoming; Wang Yuejun; Liu Wenhang; Yang Yuanzhen;

  • 作者单位

    NW Univ Xian, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China;

    NW Univ Xian, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China;

    NW Univ Xian, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China;

    NW Univ Xian, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China;

    NW Univ Xian, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China;

    NW Univ Xian, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China;

    NW Univ Xian, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China;

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

    Mafic dikes; Huicheng Basin; Qinling orogen; Intracontinental extension; Early Cretaceous;

    机译：镁铁岩堤;回城盆地;秦岭造山带;陆内伸展;早白垩世;白垩纪;

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