...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Geochemistry International >Evidence of Middle Neoproterozoic Extensional Tectonic Settings along the Western Margin of the Siberian Craton: Implications for the Breakup of Rodinia
【24h】

Evidence of Middle Neoproterozoic Extensional Tectonic Settings along the Western Margin of the Siberian Craton: Implications for the Breakup of Rodinia

机译：西伯利亚克拉通西缘的新元古代中期伸展构造背景证据：对罗迪尼亚解体的启示

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 new results of U-Pb and Ar-40/Ar-39 dating and petrological and geochemical studies of rocks from the Yenisey regional shear zone (YRSZ) in the Transangarian part of the Yenisey Ridge were used to identify a dike belt at the western margin of the Siberian craton and constrain the timing of formation of rift-related structures accompanied by within-plate magmatism. The magmatism of this epoch produced felsic and mafic intrusive rocks. The extension processes are recorded by the 797-787 Ma dike swarms. The rift origin of the rocks studied here is confirmed by their occurrence as dikes and sills confined to the YRSZ, bimodal composition of magmatic rock associations, and petrochemical characteristics of rocks typical of within-plate settings. The formation of the 800 Ma dike belt within the study area could be associated with the Neoproterozoic extensional tectonic events along the western margin of the Siberian craton which coincided with the onset of the breakup of the Rodinia supercontinent. These events provide the upper age limit for the collisional metamorphism that took place at the final stage of orogeny. The evolutionary phases identified in the region agree well with the sequence and style of tectonothermal events within the Valhalla Orogen at the Arctic margin of Rodinia and provide further support for the spatial proximity between Siberia and North Atlantic cratons during this epoch, as indicated by recent paleomagnetic data.
机译：U-Pb和Ar-40 / Ar-39测年的新结果以及来自耶尼西山脊Transangarian部分的耶尼西地区剪切带（YRSZ）的岩石的岩石地球化学研究被用于识别西部的堤防带西伯利亚克拉通的边缘，并限制了与板内岩浆作用相伴的裂谷相关结构形成的时间。这一时期的岩浆作用形成了长英质和镁铁质侵入岩。扩展过程由797-787 Ma堤防大群记录。在这里研究的岩石的裂谷起源可以通过以下形式来确认：它们以仅限于YRSZ的堤坝和窗台，岩浆岩石组合的双峰成分以及板内典型岩石的岩石化学特征为特征。研究区内800 Ma堤防带的形成可能与西伯利亚克拉通西缘的新元古代伸展构造事件有关，这与Rodinia超大陆分裂的发生相吻合。这些事件为造山运动最后阶段发生的碰撞变质提供了年龄上限。该地区确定的演化阶段与罗丹尼亚北极边缘的瓦尔哈拉造山带内的构造热事件的顺序和样式非常吻合，并为这一时期的西伯利亚和北大西洋克拉通之间的空间接近提供了进一步的支持，如最近的古磁学所表明的那样。数据。

著录项

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