Collaborative Research: High Resolution Teleseismic Crust-Mantle Studies Across a Major Archean-Proterozoic Suture in Western United States

合作研究：美国西部主要太古代-元古代缝合带的高分辨率远震壳幔研究

• 批准号: 9903235
• 负责人: Kenneth Dueker
• 金额: $ 4.09万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-12-15 至 2000-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9903235&HistoricalAwards=false
• 关键词: Collaborative; Research; Resolution; Teleseismic; Crust

Ongoing studies of the "Deep Probe" teleseismic transects, which cross a major Archean-Proterozoic suture in Wyoming and Colorado, pose questions that analysis of the co-located Lodore broadband data can address. The very dense teleseismic sampling provided by this array - one year of recording from 33 stations distributed in a 2-D grid at 5-10 km station spacing - will allow detailed imaging of crustal and mantle structure. We propose to use 3-dimensional Kirchoff migration to: 1) depth migrate Pms and Ppms Moho arrivals and other potential discontinuities observed in the upper 100 km; 2) migrate the P-wave coda to search for coherent near-surface scattering due to topography and sedimentary basins; 3) image the amplitude/sharpeness/scattering characteristics of the 410 and 660 km discontinuities. Integration of this proposed research with our Deep Probe results will allow us to better define what processes are currently reworking this circum-cratonic region, and if the Archean and Proterozoic lithosphere is responding differently to the reworking event.

正在进行的对“深探针”远距离样带的研究，该样本穿过怀俄明州和科罗拉多州的大帝原缝线，提出了分析共同位置的Lodore宽带数据可以解决的问题。 该阵列提供的非常密集的伸展性采样 - 从5-10 km站间距的2 -D网格分布的33个站点记录的一年 - 将允许对地壳和地幔结构进行详细的成像。 我们建议使用3维的Kirchoff迁移到：1）深度迁移PMS和PPMS MOHO到达以及在100 km上方观察到的其他潜在不连续性； 2）迁移p波尾声以寻找由于地形和沉积盆地而引起的连贯的近地面散射； 3）图像410和660 km不连续性的幅度/清晰度/散射特性。 这项提出的研究与我们的深入探测结果的整合将使我们能够更好地定义哪些过程正在重新加工该周围的区域，以及是否对返工事件的大代表和proteroxoic岩石圈对响应有所不同。