Thermomechanical Development of the Internal Zone and Linkage with the Fold and Thrust Belt, Central Brooks Range, Alaska

9405560阿拉斯加布鲁克斯山脉的帕特里克是一个主要的碰撞带，其中包含一个高压/低温岩石的变质核。认为变质核蓝片岩相和绿片岩相岩石是中、中生代向北的岛弧与古老的被动大陆边缘碰撞的结果。P.I.S最近在该地区的工作表明，在中央布鲁克斯山脉片岩带上拟议的一次主要逆冲实际上是一种地层接触，有证据表明，块体变形主要是收缩变形，而不是其他工作人员提出的伸展变形。该项目将研究布鲁克斯山脉内变质带与外变质带之间的岩石学、构造和年代学。它将研究内外带之间的联系，并研究碰撞造山事件期间伸展和收缩的贡献。这项工作的结果将广泛适用于所有主要造山带。

9405560 Patrick The Brooks Range of Alaska is a major collisional belt that contains a metamorphic core of high pressure/low temperature rocks. It is thought that these blueschist and greenschist facies rocks in the metamorphic core resulted form a mid-Mesozoic collision between a north-facing island arc and an older passive continental margin. The P.I.'s recent work in the area has shown that a proposed major thrust in the schist belt of the Central Brooks Range is in fact a stratigraphic contact and there is evidence to suggest that the bulk deformation was mostly contractional, rather than extensional as proposed by other workers. This project will examine the petrology, structure and geochronology of the transition between the internal metamorphic zone and the external zone of the Brooks Range. It will investigate the links between the internal and external zones and examine the contributions of extension and contraction during the collisional orogenic event. The results of this work will be broadly applicable to all major orogenic belts.