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

了解地壳变形的一个更为关键的问题是了解中下地壳的变形机制和应变分配，在中下地壳中，深部成矿作用和部分熔融作用不是地壳软化的关键因素。这项合作研究通过检查怀俄明州东南部的下地壳，晚太古宙岩石来解决这个问题。这项研究将涉及野外测绘，以确定应变的分布，变质岩石学，以建立变形的压力-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，而纹理工作将允许确定变形的机制。除此之外，这些数据将直接影响这组岩石的结构演化，并允许对这一地壳碎片的太古代边界进行构造重建。

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.