Geochronologic and Related Studies, Southern and Central NewEngland

地质年代学及相关研究，新英格兰南部和中部

• 批准号: 8917230
• 负责人: L. Peter Gromet
• 金额: $ 12.5万
• 依托单位: Brown University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-01-01 至 1992-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8917230&HistoricalAwards=false
• 关键词: Geochronologic; Related; Studies; Southern; Central

Recent determinations of diffusion rates of cations in several common minerals allow a mineral dating method to resolve between protracted slow cooling and discrete later tectonic events. This project will study Paleozoic metamorphism and deformation in the southern and central New England Appalachians. It will obtain Rb-Sr, Sm-Nd and U-Pb isotopic data on co-existing minerals in high grade metaigneous gneisses and amphibolites in order to determine the time of last recrystal- lization or initiation of cooling following high temperature metamorphism. The results of this study will allow features of middle Paleozoic and late Paleozoic shear zones to be dated, yielding a clearer understanding of major events in the northern Appalachians.

阳离子扩散速率的测定 几种常见的矿物可以用矿物定年法来分辨 在漫长的缓慢冷却和离散的后期构造运动之间 事件 该项目将研究古生代变质作用， 新英格兰南部和中部的变形 阿巴拉契亚山脉 将获得Rb-Sr、Sm-Nd和U-Pb同位素数据 高品位变质片麻岩中的共存矿物， 以确定最后一次再结晶的时间 高温后的冷却或开始冷却 变质作用 本研究的结果将允许以下特征 中古生代和晚古生代剪切带的年代确定， 对北方的重大事件有了更清楚的了解 阿巴拉契亚山脉