Radiogenic Isotope Characteristics of Late Cretaceous and Tertiary Igneous Rocks Across the Southern Margin of the North American Craton, Northern Sierra Madre Occidental, MX

墨西哥西马德雷山脉北部北美克拉通南缘晚白垩世和第三纪火成岩的放射性同位素特征

• 批准号: 9705773
• 负责人: Fred McDowell
• 金额: $ 12.95万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-07-01 至 2001-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9705773&HistoricalAwards=false
• 关键词: Radiogenic; Isotope; Characteristics; Late; Cretaceous

9705773 McDowell A number of important tectonic features of the southwestern United States extend into Mexico, however these become buried under the vast igneous province of the Sierra Madre Occidental. These features include the southern extent of the North American craton, a late proterozoic rifted margin, younger juvenile crust and the southeastward continuation of the Mojave-Sonora megashear. Several recent tectonic syntheses reconstructing plate positions between south and north America require knowledge of the location of these features now covered by volcanics to discriminate between models. The project will utilize isotopic contamination of the younger volcanics as an indicator of the character of the wall rocks during magma ascent. Results should help to better locate important tectonic boundaries and other features, now inaccessible under the thick volcanics pile.

小行星9705773 美国西南部的一些重要的构造特征延伸到墨西哥，但这些都被埋在西方马德雷山脉的巨大火成岩省之下。 这些特征包括北美克拉通的南部范围，晚元古代裂谷边缘，年轻的青少年地壳和东南延伸的莫哈韦-索诺拉megashear。 最近的几个构造合成重建板块之间的位置南北美洲需要这些功能的位置，现在被火山岩的知识，以区分模型。 该项目将利用较年轻的火山岩的同位素污染作为岩浆上升期间围岩特征的指标。 研究结果应该有助于更好地定位重要的构造边界和其他特征，这些特征现在在厚厚的火山岩堆下无法到达。