Strain and Mass Transport Associated with Ductile Exhumation of the Torlesse Accretionary Wedge

构造学的一个基本问题是汇聚楔内变质岩的隆起和挖掘。特别令人感兴趣的是侵蚀与构造变薄的相对作用，其中变薄可以通过正常断层和/或韧性流动发生。该项目将测量整个奥塔哥顶点的有限变形，以了解侵蚀和楔内韧性流动如何促进楔的挖掘。奥塔哥高潮标志着新西兰托勒斯增生楔的弧前高点，并得到了很好的研究。这些岩石被保存在白垩纪中期的准平原和一层薄薄的较年轻的地层之下，这为识别较年轻的变形的影响提供了一个基准。该区域的有限应变模式以及有关体积应变的信息将用于求解中白垩纪的隆起和弧前隆起的侵蚀速率。这些结果将为其他收敛边际情况的比较提供一个有用的模型。

9814807Brandon A fundamental problem in tectonics is the uplift and exhumation of metamorphic rocks within convergent wedges. Of particular interest are the relative roles of erosion versus tectonic thinning, where thinning can occur by normal faulting and/or ductile flow. This project will measure finite deformation across the Otago culmination in order to understand how erosion and within-wedge ductile flow contribute to exhumation of the wedge. The Otago culmination marks the forearc high of the Torlesse accretionary wedge of New Zealand, and has been well-studied. The rocks are preserved beneath a middle Cretaceous peneplain and a thin cover of younger strata which provides a datum for identifying effects of younger deformation. The pattern of finite strain over the region, along with information about volume strains will be used to resolve middle Cretaceous uplift and erosion rates for the forearc high. These results will provide a useful model for comparison to other convergent margin situation.