COLLABORATIVE RESEARCH: Thermochronologic Evidence for Uplift and Unroofing of the Olympic Mountains

合作研究：奥林匹克山脉隆起和屋顶脱落的热年代学证据

• 批准号: 9117941
• 负责人: Mary Roden-Tice
• 金额: $ 3.52万
• 依托单位: Rensselaer Polytechnic Institute
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-01-01 至 1994-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9117941&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Thermochronologic; Evidence; Uplift

The Cascadia convergent margin in northwest Washington State marks the subduction boundary between North America and the Juan de Fuca plate. The Olympic mountains consist of an assemblage of Eocene to Miocene thrusts structurally overlain by Eocene basalts and Eocene to Miocene clastic rocks. Uplift of these rocks occurred during the late Miocene. These observations and available fission track data have resulted in a tectonic model involving accretion and underplating followed by uplift while accretion continues. This project will test between two end-member explanations for the timing and style of the uplift, simple doming or large scale normal faulting. Methods include fission track dating and structural analysis. Results should help understanding causes of uplift in active convergent orogens.

华盛顿州西北部的卡斯卡迪亚会聚边缘 标志着北美洲和胡安河之间的俯冲边界 德富卡车牌 奥林匹克山脉由一系列 始新世至中新世逆冲断层在结构上被始新世玄武岩覆盖 始新世至中新世碎屑岩。 这些岩石的风化 发生在中新世晚期 这些观察和可用 裂变径迹数据产生了一个构造模型， 加积和底侵，随后是加积时的隆升 继续。 本项目将在两个端元之间进行测试 解释了隆升的时间和方式，简单的隆起 或大规模的正断层 方法包括裂变径迹 年代测定和结构分析 结果应该有助于理解 活动会聚造山带隆升的原因。