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

9814807 Brandon构造学的一个基本问题是会聚楔内变质岩的隆起和折返。 特别令人感兴趣的是侵蚀与构造减薄的相对作用，减薄可以通过正常断层和/或韧性流动发生。 该项目将测量奥塔哥顶点的有限变形，以了解侵蚀和楔内韧性流动如何有助于楔的折返。 奥塔哥顶点标志着新西兰Torlesse增生楔的弧前高压，并已得到充分研究。 这些岩石保存在白垩纪中期的一个冲积平原和一个较年轻的地层的薄覆盖层之下，这为识别较年轻的变形作用提供了一个基准。 该地区的有限应变模式，沿着与体积应变的信息将被用来解决中白垩纪隆起和侵蚀速率的弧前高压。 这些结果将提供一个有用的模型，以比较其他收敛的利润率的情况。

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.