• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of geodynamics >Post-Deccan Trap stress reorientation under transpression: Evidence from fault slip analyses from SW Saurashtra, Western India
【24h】

Post-Deccan Trap stress reorientation under transpression: Evidence from fault slip analyses from SW Saurashtra, Western India

机译：压力作用下的Deccan陷阱应力重新定向：来自印度西部SW Saurashtra的断层滑动分析的证据

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

We analyze paleostress from a region in SW Saurashtra (India) using three free software, T-Tecto, WinTensor and FaultKin based on attitudes of similar to E-W trending, sub-vertical, brittle fault planes and associated horizontal, inclined and subvertical slickensides, developed over them. We present a detailed fault slip analysis of a previously unmapped E trending fault (herein referred as the Katar Fault) that cuts across and offset the southeastward dipping Deccan lava flows with a dense NE-SW trending dyke swarm belonging to Deccan Trap near Rajula (Gujarat, India). Measured fault strikes do not match exactly with similar to NW/NNW trending basement structures, deduced by previous geophysical studies, nor with faults reported from the offshore Saurashtra region. However, a few geomorphic features around Katar indicate a similar strike slip offset. A stress ratio of up to 0.2, and a SE maximum principal stress axis were deduced using T-Tecto, while WinTensor and FaultKin gave plunging stress axes. Therefore, stress analyses by T-Tecto seem more plausible. The SHmax direction usually remains close to one of the stress axes, and shows up to 36 degrees rotation when compared with the offshore region. We attribute the formation of Katar Fault to post-Deccan Trap oblique slip reverse faulting with sinistral slip due to intraplate transpressional stresses induced by the anticlockwise rotation and collision of the Indian plate with the Eurasian plate at similar to 55 Ma. This transpressional faulting post-dates the eastward tilting of lava flows and anticlockwise rotation in the dyke swarm patterns caused by the emplacement of large Girnar intrusive body. Detailed structural geological field-work in Saurashtra would be much required to understand its onshore tectonics.
机译：我们使用三种免费软件，即T-Tecto，WinTensor和FaultKin，基于类似于EW趋势，亚垂直，脆性断层平面以及相关的水平，倾斜和亚垂直滑动滑坡的态度，分析了印度Saurashtra地区的古应力。在他们之上。我们对先前未映射的E趋势断层（此处称为Katar断层）进行了详细的断层滑动分析，该断层横穿并抵消了东南向倾覆的Deccan熔岩流和属于拉古拉附近的Deccan圈闭的稠密NE-SW趋势堤群（古吉拉特邦） ，印度）。测得的断层走向与以前的地球物理研究推论的与西北/北西北向的趋势基底结构不完全匹配，也与从索拉什特拉近海地区报道的断层并不完全匹配。然而，卡塔尔周围的一些地貌特征表明类似的走滑偏移。使用T-Tecto推算出最大为0.2的应力比和SE最大主应力轴，而WinTensor和FaultKin给出了急剧下降的应力轴。因此，通过T-Tecto进行应力分析似乎更合理。 SHmax方向通常保持靠近应力轴之一，并且与海上区域相比，旋转最高显示36度。我们将卡塔尔断层的形成归因于Deccan Trap倾斜滑移逆断层，其与左旋滑移有关，这是由于印度板块与欧亚板块逆时针旋转和碰撞所引起的板内压应力所致，类似于55 Ma。这种高压断层的发生是由于大吉尔纳尔侵入体的进入引起的熔岩流向东倾斜和堤防群模式的逆时针旋转。要了解其陆上构造，将需要在索拉什特拉进行详细的结构地质野外工作。

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