REU: Sm-Nd Isotopic Investigations and Crustal Growth Within the Adirondack Mountains and Mid-Proterozoic Inliers of the Northeastern Appalachians (Mass., N.J., N.Y., VT.)

前寒武纪构造的一个基本问题是从地幔中提取地壳物质的时间和数量，以及它加入地壳的时间和数量。然而，很难将新添加的物质与回收的旧地壳材料区分开来。该项目将利用同位素技术来建立ND模式年龄，并确定岩石母质从地幔中分离出来的时间。结合U-Pb年龄，这些数据将使人们能够估计阿巴拉契亚东北部晚元古代(1300-1000 Ma)的新物质。

A fundamental question for pre-Cambrian tectonics is the timing and amounts of extraction of crustal material from the mantle and its addition to the crust. However, it has been difficult to distinguish new additions from recycled older crustal material. This project will employ isotopic technique to establish Nd-model ages and fix the time since the parental material of the rocks separated from the earth's mantle. Coupled with U-Pb ages, these data will allow the estimation of new materials to the Northeastern Appalachians during late proterozoic time (1300-1000 Ma).