Combined Petrologic, 40Ar/39Ar, and Fluid Inclusion Study ofan Inverted Metamorphic Sequence, Maclaren Metamorphic Belt,Alaska

本文建议对麦克拉伦变质带进行进一步的野外和实验室研究，以确定这些岩石的热历史和构造历史，这些岩石出现在阿拉斯加中南部的一个加积地体之间的缝合带。该带是温度升高的逆变质岩的一个例子。同构造的tonalite断层与较高品位的岩石有关，但热梯度被解释为在大陆-大陆碰撞过程中，热的、更深的地壳岩石在厚沉积层上的逆冲造成的。它们被随后的隆起和侵蚀暴露出来。研究的目的是确定P-T历史，从中可以估计隆起的幅度。Ar-Ar地质年代学将用于估计隆起速率。这些结果将用于解释构造历史和加热的原因。

Continued field and lab studies of the Maclaren metamorphic belt are proposed to determine the thermal and tectonic history of these rocks, which occur in a suture zone between accreted terranes in South-central Alaska. The belt is an example of inverted metamorphic rocks which grade upward in temperature. Syntectonic tonalite sills are associated with the higher grade rocks but the thermal gradient is interpreted as being caused by thrusting of hot, deeper crust rocks over a thick sediment package during continent - continent collision. They are exposed by subsequent uplift and erosion. The aim of the research is to determine P-T history from which magnitude of uplift can be estimated. Ar-Ar geochronology will be used to estimate uplift rates. These results will be used to interpret the tectonic history and causes for heating.