COLLABORATIVE RESEARCH: Alternating Contraction and Extension During the Late Mesozoic to Early Cenozoic, Northwestern Utah

小行星9317044 理论和物理模型以及实地研究表明，复杂的结构历史，包括交替收缩和伸展，可以在收缩造山带的内部发展，基本上缓和地壳厚度在造山带的增长。 本项目将利用犹他州西北部Raft River和Grouse Creek Mountains的Sevier Orogen腹地的中地壳暴露来测试这些模型。这项工作将涉及构造制图、变质热压测量、P-T-t路径建模和几种地质年代学技术。 本研究将讨论该地区变形历史的几个组成部分，并测试中生代区域收缩和造山后伸展期间中地壳演化的几个现有模型。 它也将有助于联系可能的同时代变形之间的腹地和前陆冲断带。 ***

9317044 Hoisch Theoretical and physical models as well as field studies suggest that complex structural histories involving alternating contraction and extension can develop within the interior of contractional orogenic belts, essentially moderating crustal thickness during the growth of the orogenic belt. This project will attempt to test these models by use of mid-crustal exposure of the hinterland of Sevier Orogen in the Raft River and Grouse Creek Mountains of northwestern Utah. The work will involve structural mapping, Metamorphic thermobarometry, P-T-t path modeling, and several geochronologic techniques. This study will address several components of the deformation history of the area and test several existing models for middle crustal evolution during Mesozoic regional contraction and post-orogenic extension. It will also help link the possible coeval deformations between the hinterland and the foreland thrust belt. ***