...
  • 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 >Metamorphic imprint of ridge subduction on the Neo-Tethyan ophiolites from the Saka Unit (Central Pontides, northern Turkey)
【24h】

Metamorphic imprint of ridge subduction on the Neo-Tethyan ophiolites from the Saka Unit (Central Pontides, northern Turkey)

机译：来自Saka单位的新Thetyan Ophiolites上岭俯冲的变质印记（中央Pontides，北部土耳其）

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 Intra-Pontide suture zone is the northernmost ophiolite suture zone exposed in the Anatolian peninsula. It consists of several variably deformed and metamorphosed tectonic units derived from the Neo-Tethyan IntraPontide oceanic (IPO) basin, and its continental margins that are currently represented by the Istanbul Zonguldak and the Sakarya terranes. Recent data suggests that the IPO was a wide supra-subduction oceanic basin whose closure began in the uppermost Early Jurassic by a north dipping intra-oceanic subduction that divided the IPO into two different oceanic areas, namely IPO1 and IPO2. The Saka Unit is a small tectonic unit exposed in the eastern portion of the Intra-Pontide suture zone in the Central Pontides, which is interpreted as a tectonic melange produced during the intra-oceanic subduction that led to the closure of IPO1. The unit was affected by polyphase deformation and epidote-amphibolite facies metamorphism peak conditions experienced during the uppermost Middle Jurassic. Metamorphic studies and thermodynamic investigations constrain the peak pressure conditions to T approximate to 650-700 degrees C and P approximate to 0.9-1.3 GPa. These conditions reveal a 'hot' and anomalous geothermal gradient (15-22 degrees C/km) with respect to those of the other ophiolite-bearing units of the IntraPontide suture zone involved in the subduction. This anomalous gradient was herein attributed to the thermal pulse produced by the subduction of the IPO1 mid-oceanic ridge. The final re-equilibration occurred under greenschist facies conditions during the Early Cretaceous exhumation, when the oceanic lithosphere of the IPO was completely consumed and the continental collision between the Istanbul-Zonguldak and Sakarya terranes occurred.
机译：岩土内缝合区是在阿瓦洛安半岛暴露的最北端的眼科缝线区。它由几种可变变形和变质的构造单元组成，来自新Tethyan inthantide海洋（IPO）盆地，以及目前由伊斯坦布尔Zonguldak和Sakarya Terranes代表的大陆边缘。最近的数据表明，IPO是一个广泛的超级浏览海洋盆地，其封闭始于最早的侏罗纪，北浸入了Intra-Oceanic浏览，将IPO分为两个不同的海洋区域，即IPO1和IPO2。 Saka单元是在中心地板中的岩土内缝合区的东部暴露的小型构造单元，其被解释为在导致IPO1闭合的海洋俯冲期间产生的构造传感。该单位受到多相变形和ePIDOTE-AMPHIBOLITE相变性变质峰值条件的影响，在最上层侏罗纪中经历的变质峰值条件。变质研究和热力学研究将峰值压力条件限制为近650-700摄氏度和P大于0.9-1.3GPa。这些条件揭示了在俯卧所涉及的内部内侧缝合区的其他含有眼镜缝合区的其他膜轴承单元的“热”和异常的地热梯度（15-22摄氏度）。这种异常梯度本文归因于由IPO1中海脊的俯冲产生的热脉冲。当IPO的海洋岩石圈完全消耗并且伊斯坦布尔 - Zonguldak和Sakarya Terranes之间发生了最终的白垩纪挖掘时，最终重新平衡发生在磨碎的面部条件下。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
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