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

40Ar/39Ar 矿物年龄对东格陵兰喀里多尼德构造热演化的限制：与格陵兰地质调查局的合作

• 批准号: 9101444
• 负责人: R. David Dallmeyer
• 金额: $ 5万
• 依托单位: University of Georgia Research Foundation Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-07-15 至 1995-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9101444&HistoricalAwards=false
• 关键词: 40Ar; 39Ar; Mineral; Age; Constraints

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.

该奖项支持系统化的 40Ar/39Ar 测年项目，该项目与在东格陵兰喀里多尼德群岛工作的格陵兰勘测局地质学家进行的现场测绘和岩石学研究相协调。 东格陵兰岛在环大西洋关系中占有重要地位；然而，它可能是喀里多尼亚-阿巴拉契亚造山带中最鲜为人知且知之甚少的组成部分。 最近的工作表明，造山带记录了复杂的构造热演化。 然而，现有的地质年代学数据库不足以精确校准由现场和岩石学关系表明的各种离散的前寒武纪和古生代事件。 这项研究将提供最近绘制区域的 40Ar/39Ar 矿物年龄测定的系统网络。 对这些地区现场关系的密切控制将使地质年代学结果能够用于约束东格陵兰喀里多尼亚中部的热演化。