Tectonometamorphic Evolution of the Greater Himalayan Sequence of Bhutan

9406253 Hollister人们普遍认为，在许多造山带的发展过程中，存在一个热结晶岩石的快速折返阶段，导致峰值温度和顺时针PTT路径的近等温减压。喜马拉雅山脉最近的几项研究集中在喜马拉雅造山带由高温减压组成的发展阶段。一个持续存在的问题是确定在中地壳形成混合岩的热源，已经提出了几个相互矛盾的模型。这项研究是为了获得约束良好的变质P-T数据和P-T-时间变形路径的解释，以便约束关于混合岩如何在中地壳中形成或通过构造输送到中地壳的模型。这些结果将有助于理解在许多造山带的核心普遍存在的热结晶岩石快速折返的现象。

9406253 Hollister It is widely recognized that in the development of many orogenic belts there was a phase of rapid exhumation of hot crystalline rocks, giving rise to nearly isothermal decompression at peak temperature and clockwise PTt paths. Several recent studies in the Himalayas have focused on phases in the development of the Himalayan orogen consisting of high temperature decompression. One of the continuing problems is identifying the heat source for forming the migmatites in the middle crust, and several conflicting models have been proposed. This research is to obtain well constrained metamorphic P-T data and interpretation of P-T-time-deformation paths in order to constrain models pertaining to the question of how migmatite can be formed in or tectonically transported into the middle crust. Results will help understand the common occurrence of rapid exhumation of hot crystalline rocks in the cores of many orogenic zones.