COLLABORATIVE RESEARCH: Middle-Crustal Deformation and Metamorphism of an Archean Continental Margin During Early Proterozoic Orogenesis

9706445鲍尔：理解地壳变形的一个更关键的问题是理解中下地壳的变形机制和应变分配，在那里深成作用和部分熔融不是地壳软化的关键因素。这项合作研究通过对怀俄明州东南部下地壳晚太古代岩石的研究来解决这个问题。这项研究将涉及现场测绘以确定应变的分布，变质岩石学以确定变形的压力-温度(深度)条件，以及地质年代学以确定各种变形事件的绝对时间。实验室数据将允许重建各种变形的深度和时间条件，纹理工作将允许识别变形机制。此外，这些数据将直接与这一套岩石的构造演化有关，并允许对这一地壳碎片的太古宙边界进行构造重建。

9706445 Bauer One of the more critical problems in understanding crustal deformation is understanding deformation mechanisms and strain partitioning in the middle and lower crust where plutonism and partial melting are not critical factors for crustal softening. This collaborative study address this problem through the examination of lower crustal, Late Archean rocks in southeastern Wyoming. The study will involve field mapping to determine the distribution of strain, metamorphic petrology to establish the pressure-temperature (depth) conditions of deformation, and geochronology to determine the absolute timing of the various deformation events. the laboratory data will allow the reconstruction of the depth and time conditions of the various deformations, and textural work will allow mechanisms of deformation to be identified. In addition to this, the data will bear directly on the structural evolution of this package of rocks, and allow the tectonic reconstruction of the Archean boundary of this crustal fragment.