Earth Sciences Postdoctoral Research Fellowship Award

电话-9505217 Lithgow-Bertelloni 该研究员建议根据地幔流的简单模型和详细的板块构造重建计算地球历史上最后65年的全球板内应力场。 该方法首先通过仔细比较大量现有的地质和地球物理数据集（例如，板内应力数据、古应力指标、地震、重力和热流剖面等）。 这些结果将作为评估小规模动态特征（如局部隆起）和区域尺度地壳不均匀性重要性的基线。 将利用详细的地震层析成像模型对北美西部进行区域研究，以了解全球动态过程对三种应力状态发展的影响，这三种应力状态分别是落基山脉挤压区域、盆地和山脉延伸以及加州的走滑变形。 这项工作有可能远远超出狭隘的应用在破译神秘的板内构造特征的力学;应力场的演变是一个失踪的关键，了解地幔对流。

EAR-9505217 Lithgow-Bertelloni The Fellow proposes to calculate the global intraplate stress field for the last 65 My of EarthOs history based on simple models of mantle flow and detailed plate tectonic reconstructions. The approach is to test first the hypothesis that global scale mantle circulation can explain relatively large-scale (500 km) intraplate variations in stress regimes and geology, by carefully comparing a large variety of existing geological and geophysical data sets (e.g., intraplate stress data, paleostress indicators, seismic, gravity, and heat flow profiles, etc.). The results will serve as a baseline for assessing the importance of smaller scale dynamic features, such as localized upwellings, and of regional scale crustal heterogeneities. A regional study using detailed seismic tomography models will be carried out for Western North America, to understand the influence of global dynamic processes on the development of the three types of stress regimes represented by the Rocky Mountains compressional region, the Basin and Range extension and the strike-slip deformation in California. This work has the potential to reach far beyond parochial applications in deciphering the mechanics of enigmatic intraplate tectonic features; evolution of the stress field is one missing key to understanding mantle convection.