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

合作研究：犹他州西北部中生代晚期到新生代早期的交替收缩和伸展

• 批准号: 9317044
• 负责人: Thomas Hoisch
• 金额: $ 3.82万
• 依托单位: Northern Arizona University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-03-15 至 1997-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9317044&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Alternating; Contraction; Extension

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. ***

9317044 Hoisch 理论和物理模型以及实地研究表明，涉及交替收缩和伸展的复杂结构历史可以在收缩造山带内部发展，基本上在造山带生长过程中调节地壳厚度。 该项目将尝试利用犹他州西北部拉夫特河和松鸡溪山脉塞维尔造山带腹地的中地壳暴露来测试这些模型。这项工作将涉及构造测绘、变质温压测量、P-T-t 路径建模和多种地质年代学技术。 这项研究将探讨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后造山伸展期间中地壳演化的几种现有模型。 它还将有助于将腹地和前陆冲断带之间可能的同时代变形联系起来。 ***