Testing Models of Polyphase Tectonism in Northern New Mexico and Characterizing the ~1.4 Ga Tectonic Setting of the Southwest U.S

新墨西哥州北部多相构造运动模型的测试和美国西南部 ~1.4 Ga 构造环境的表征

• 批准号: 9909457
• 负责人: Christopher Daniel
• 金额: $ 11.02万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-01-01 至 2001-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9909457&HistoricalAwards=false
• 关键词: Testing; Models; Polyphase; Tectonism; Northern

9909457HollisterPrecambrian tectonic events in the southwest United States involved accretion of island arcs and continental fragments accompanied by regional metamorphism and extensive pluton emplacement. However, the tectonic setting of several of these events is not well understood, and is complicated by the possibility of two periods of regional high grade metamorphism affecting these rocks. This research will investigate an area in northern New Mexico having a strong 1.4 Ga regional metamorphism but no exposed 1.4 Ga plutons that might impart a local thermal and strain perturbation. The research will attempt to apply a new age-dating technique to separate the 1.4 Ga metamorphism from residual 1.65 Ga metamorphism and to combine results with structural and metamorphic studies in order to develop a better understanding of the regional 1.4 Ga tectonic setting.

9909457美国西南部的霍利斯特前寒武纪构造事件涉及岛弧和大陆碎片的增生，伴随着区域变质作用和广泛的岩体侵位。 然而，这些事件的构造背景还没有得到很好的理解，并复杂的可能性，两个时期的区域高级变质作用影响这些岩石。 本研究将调查北方新墨西哥州的一个地区，该地区具有强烈的1.4 Ga区域变质作用，但没有暴露的1.4 Ga岩体，可能会带来当地的热和应变扰动。 本研究将尝试应用一种新的测年技术，将1.4Ga变质作用与1.65Ga残余变质作用分离，并将其结果与构造和变质作用研究联合收割机结合起来，以便更好地了解区域1.4Ga构造背景。