Dating New England: A Collaborative Study of the Timing of Metamorphism, Assembly and Exhumation of the Central New England Orogen

对斯皮尔斯新英格兰的地质研究已经进行了很长时间，在泥盆纪阿卡迪亚造山运动期间，新英格兰中部的演化被广泛地理解为早泥盆纪的碰撞事件。然而，关于该地块的变质作用时间、组合时间和发掘时间等问题，对该地块和任何挤压造山带的发育都具有根本性的意义。该项目将采用强大的新年龄测定技术，提供在经典阿卡迪亚研究中无法获得的详细年龄控制。研究结果将有助于在构造格架中确定变质作用高峰的时间，评估沿走向发生时侵变质作用的可能性，并评估产生逆变质层序的可能性。在研究经典造山带的同时，这些关系的知识也适用于建立所有造山带演化的模型。

0073754 Cheney0073747 SpearNew England has long been studied geologically, and the evolution of Central New England during the Devonian Acadian Orogeny is broadly understood as an early Devonian collisional event. However, there are a number of questions about the timing of metamorphism, assembly and exhumation of this terrane that are of fundamental significance in the development of this and any compressional orogen. This project will employ powerful new techniques of age dating to provide the detailed age control that was not available during the classic Acadian studies. Results are expected to help place the timing of peak metamorphism in a tectonic framework, to assess the possibility of time - transgressive metamorphism along strike and to evaluate scenarios for producing inverted metamorphic sequences. While focused on their classic orogen, knowledge of these relationships is applicable to developing models for the evolutions of all orogenic belts.