Mesozoic Extensional Processes in the Sevier Orogen: Studies in the Funeral Mountains, CA-NV and the Bitterroot Mountains, ID-MT

有证据表明，在构造收敛过程中，大规模伸展与整体挤压同时发生。伸展作用通常发生在构造高层，而压缩作用则发生在深部，但人们对其相对程度和位移的了解并不清楚。该项目继续调查爱达荷州和蒙大拿州的比特鲁特山脉在塞维尔造山带期间可能发生的中生代伸展。先前的研究结果表明，在这一构造时期，加利福尼亚的丧礼山发生了伸展活动。这项工作将有助于确定这一现象对塞维尔造山带的区域范围和重要性。研究结果可用于理解挤压造山带伸展作用的一般意义。

Evidence that large scale extension operates at the same time as overall compression during tectonic convergence has been observed in several orogens. The extension is usually at high structural levels while compression is operating at depth, however the relative extent and displacements are not well understood. This project continues, investigation of possible Mesozoic extension in the Bitterroot Mountains of Idaho and Montana that occurred during the Sevier Orogen. Prior results indicate that extension operated in the Funeral Mountains of California during this tectonic episode. This work will help determine the regional extent and importance of this phenomena for the Sevier Orogen. The results should be applicable to understanding the general significance of extension in compressional orogens.