Geochronologic and Related Studies, Southern and Central New England

新疆中南部古生代变质变形作用 英格兰阿巴拉契亚山脉是复杂和polyphaze，并试图分离 并准确确定地质构造事件的年代是很困难的 最近 几种常见矿物阳离子扩散率的测定 用矿物测年法来解决 以及在这个结构复杂的地区发生的离散的后期构造事件。 本研究将获得Rb-Sr和Sm-Nd同位素数据， 高级变质片麻岩和斜长角闪岩中的矿物， 确定最后再结晶或开始冷却的时间 经过高温变质作用。 详细分析， 内部和外部比较以及质量平衡考虑将 允许对技术进行严格的评估，这是相当普遍的， 可能适用于许多其他造山带。 的结果 该研究将使中古生代和晚古生代的特征 要分开的起源，产生一个更清晰的理解主要 北方构造发展的高潮事件 阿巴拉契亚山脉和一个改进的信息库的结构 热模型

Paleozoic metamorphism and deformation in the southern and central New England Appalachians was complex and polyphaze, and attempts to separate and accurately date tectonic episodes has been difficult. Recent determinations of diffision rates of cations in several common minerals allow a mineral dating method to resolve between protracted slow cooling and discrete later tectonic events in this structurally complex region. The study will obtain Rb-Sr and Sm-Nd isotopic data on coexisting minerals in high grade metaigneous gneisses and amphibolites in order to determine the time of last recrystallization or initiation of cooling following high temperature metamorphism. Detailed analyses employing internal and external comparisons and mass balance considerations will permit stringent evaluation of the technique, which is quite general and potentially applicable to many other orogenic terranes. The results of this study will allow features of middle Paleozoic and late Paleozoic orgination to be separated, yielding a clearer understanding of major culminating events in the tectonic development of the northern Appalachians and a improved information base for the constructure of thermal models.