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.

正在进行的研究“深探测器”，跨越一个主要的太古代-元古代缝合线在怀俄明州和科罗拉多，提出了问题，分析的共同定位Loeanites宽带数据可以解决。 该阵列提供的非常密集的地壳取样-以5-10公里站间距分布在二维网格中的33个站的一年记录-将允许对地壳和地幔结构进行详细成像。 我们建议使用3维Kirchoff偏移：1）深度偏移Pms和Ppms莫霍面到达和其他潜在的不连续观察到的上100公里; 2）偏移P波尾波搜索相干近地表散射由于地形和沉积盆地; 3）图像的振幅/锐度/散射特性的410和660公里的不连续性。 将这项拟议的研究与我们的深度探测结果相结合，将使我们能够更好地确定目前正在改造这个环太平洋地区的过程，以及太古代和元古代岩石圈是否对改造事件做出不同的反应。