Development of a 4-D Model of Crustal Evolution in the Northern Rocky Mountains

落基山脉北部地壳演化 4 维模型的开发

• 批准号: 0545751
• 负责人: Paul Mueller
• 金额: $ 21.65万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-04-01 至 2011-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0545751&HistoricalAwards=false
• 关键词: Development; Model; Crustal; Evolution; Northern

0545751MuellerIn order to optimize current and future deployment of EarthScope (ES) resources in the northern Rocky Mountains/Great Plains, a group of earth scientists from the University of Florida, Montana State University, and the U.S. Geological Survey are conducting research directed toward development of an integrated temporal and spatial (i.e., 4-D) framework for crustal evolution in this region. In particular, this region contains one of the most enigmatic segments of continental crust in North America, the Great Falls tectonic zone (GFTZ). This long-lived crustal structure has the most temporally extensive rock record in North America (ages to 4 billion years) and has had a major impact on the geologic history of this region, including younger episodes of faulting and seismicity, distribution of magmatism and ore deposits, and the creation of resource-rich sedimentary basins. For example, the intersection of the GFTZ and Trans-Hudson orogen, which developed ~ 1.8 billion years ago, is now the site of a major petroleum resource province, the Williston basin. Similarly, Phanerozoic structural reactivation, magmatism, seismicity, and mineralization in the northern Rocky Mountains is concentrated in the GFTZ, which leads to additional possibilities of how ancient structures and events may control modern earth processes and the distribution of resources.The research group is applying modern geochronologic (ion probe U-Pb), thermochronologic (multi-and single grain 40Ar-39Ar), and geochemical (major and trace elements) techniques to samples from outcrops, deep test wells, and xenoliths (pieces of the mantle and lower crust brought to the surface via volcanic eruptions). These results will be critical for both optimizing the deployment of ES resources and ultimately developing an integrated 4-D framework for the northern Rocky Mountain/northern Great Plains portion of North America. This 4-D framework is essential to: 1) unraveling one of the most intriguing episodes of continent formation in the geologic record, the formation of Laurentian North America; 2) understanding how the amalgamating collisional events were recorded in the crust and mantle; and 3) to what extent these ancient events affected subsequent crustal and lithospheric evolution in the northern Rocky Mountains/Great Plains. The research team is utilizing facilities from all three organizations (University of Florida, Montana State University, and the U.S. Geological Survey). Student participation at the graduate and undergraduate level is providing critical workforce training in geologic and analytical skills. The results of this research will be integrated into the evolving Montana GIS/DEM geologic map base being developed at Montana State University. All of the geochemical and geochronologic data will be numerically and spatially displayed in an interactive web format and accessible to geoscientists, educators, and the general public. Results will also be disseminated via meeting presentations and peer reviewed journals.

0545751Muellerin下令优化北部落基山脉/大平原的地球资源的当前和未来部署，佛罗里达大学，蒙大拿州立大学和美国地质调查局的一组地球科学家正在进行针对综合时间和空间和空间（即4-D）框架的开发的研究，以促进该领域的框架，以实现这一领域的框架，以在这一领域进行此类框架。 特别是，该地区包含北美大陆地壳最神秘的段之一，即大瀑布构造区（GFTZ）。 这种长期的地壳结构在北美具有最广泛的岩石记录（年龄至40亿年），并对该地区的地质历史产生了重大影响，包括较年轻的断层和地震性发作，岩浆和矿石矿床的分布以及资源丰富的沉积物的创造。 例如，在18亿年前发展的GFTZ和Trans-Hudson造成的交集现在是主要石油资源省Williston盆地的地点。 同样，GFTZ集中在北部落基山山脉的拟南芥结构性重新激活，岩浆，地震性和矿化，这会导致古老结构和事件如何控制现代地球过程以及资源分布的其他可能性。地球化学（主要和微量元素）技术，用于露头，深层测试井和异种石的样品（地幔的碎片和下层地壳通过火山喷发带到表面）。 这些结果对于优化ES资源的部署以及最终为北美北部落基山/北部大平原部分开发的综合4-D框架至关重要。 这个4-D框架对于：1）在地质记录中揭开大陆形成的最有趣的情节之一，即洛朗北美的形成； 2）了解如何在地壳和地幔中记录融合的碰撞事件； 3）这些古老的事件在多大程度上影响了北部落基山/大平原的后续地壳和岩石圈进化。 研究小组正在利用所有三个组织（佛罗里达大学，蒙大拿州立大学和美国地质调查局）的设施。 学生参与研究生和本科阶段正在提供地质和分析技能方面的重要劳动力培训。 这项研究的结果将集成到蒙大拿州立大学不断发展的蒙大拿州GIS/DEM地质地图基础中。 所有地球化学数据和地质数据都将在数值和空间上以交互式网络形式显示，地球科学家，教育工作者和公众都可以访问。 结果还将通过会议演示文稿和同行评审期刊传播。