Isotopic & Petrographic Provenance Study of Sediments in the Methow-Tyaughton Basin, WA. and British Columbia: Implications for Tectonic History of the Northwestern Co

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• 批准号: 9117916
• 负责人: Bruce Nelson
• 金额: $ 10万
• 依托单位: University of Washington
• 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: 1992-01-15 至 1994-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9117916&HistoricalAwards=false
• 关键词: Isotopic; & Petrographic; Provenance; Study

During Mesozoic and Tertiary time the western margin of North America developed by the accretion and rearrangement of numerous fault-bounded blocks or terranes. Detritus shed from these blocks accumulated in basins and may record some of the history of this tectonism. This project will address several questions by use of Sm-Nd and U-Pb isotopic studies of Mesozoic sequences in northern Washington State and southern British Columbia, including determining when the terranes arrived and began to contribute detritus to the basins and whether the volcanic activity recorded in the basins reflects oceanic or continental margin volcanic arcs. Results are expected to provide new insights to the tectonic development of northwestern North America and to further demonstrate the utility of this technique.

在中生代和第三纪时期， 美国的发展是由众多的 有断层的岩块或断层带。 从这些石块上脱落的碎石 在盆地中积累，并可能记录了一些历史， 构造作用 本项目将通过使用 北方中生代地层Sm-Nd和U-Pb同位素研究 华盛顿州和不列颠哥伦比亚省南部，包括 确定了这些人何时到达并开始捐款 以及火山活动是否记录了 反映了大洋或大陆边缘火山弧。 研究结果有望为地质构造提供新的认识 北美西北部的发展， 展示了这项技术的实用性。