40Ar/39Ar Mineral Age Constraints on the Tectonnthermal Evolution of the East Greenland Caledonides: Collaboration with the Greenland Geological Survey

该奖项支持一个系统的40Ar/39Ar测年项目，该项目与在东格陵兰卡利多尼德工作的格陵兰调查局地质学家的野外制图和岩石学研究相协调。东格陵兰岛在环大西洋相关性中占据关键地位；然而，它可能是加里东-阿巴拉契亚造山带中最不为人所知和最不为人所知的组成部分。最近的研究表明，造山带记录了一个复杂的构造热演化过程。然而，现有的地质年代学数据库不足以精确校准由野外和岩石学关系所指示的各种离散的前寒武纪和古生代事件。这项研究将为最近绘制的地区提供一个40Ar/39Ar矿物年龄测定的系统网络。对这些地区野外关系的密切控制将使地质年代学结果用于约束格陵兰东部加里东尼德中部的热演化。

This award supports a systematic 40Ar/39Ar dating project which has been coordinated with field mapping and petrologic studies by geologists of the Greenland Survey working in the East Greenland Caledonides. East Greenland occupies a critical position in circum-Atlantic correlations; however, it is probably the least known and most poorly understood component of the Caledonian-Appalachian orogen. Recent work has demonstrated that the orogen records a complex, tectonothermal evolution. However, the available geochronologic database is inadequate to precisely calibrate the various discrete Precambrian and Paleozoic events which are indicated by both field and petrologic relationships. This research would provide a systematic network of 40Ar/39Ar mineral age determinations in areas recently mapped. The close control on field relationships in these areas will enable the geochronological results to be used to constrain the thermal evolution in the central East Greenland Caledonides.