Hafnium Isotopes and Crustal Chemical Processes

该项目是一个Hf和（在需要时）Nd同位素研究 (1)一系列广泛的花岗岩， （2）一个参考套件， 花岗岩是由年轻源岩形成的。 样品将来自 PI自己的收藏，从其他已发表的研究和从一个 提议从美国西南部收集新的1.4 Ga花岗岩。 还计划研究Lu-Hf同位素的弹性 变形/蚀变岩石中的系统。 Lu-Hf、Sm-Nd和Rb-Sr结果 对一个糜棱岩化的元古宙花岗岩进行了描述， 在钾质交代作用中发生的变化， 在富F的蚀变环境中进行。

This project is for a Hf and (where needed) Nd isotopic study of (1) a wide-ranging set of granites derived from crustal sources that were old at time of melting, and (2) a reference suite of granites derived from juvenile sources. Samples will be from the PIs'own collections, from other published studies and from a proposed new collection of 1.4 Ga granites from the S.W. USA. Also planned is a study of the resilience of the Lu-Hf isotopic system in deformed/altered rocks. Lu-Hf, Sm-Nd and Rb-Sr results for a mylonitized Proterozoic granite are described, and studies of changes that occur in potassic metasomatism, in HCl-rich and in F-rich alteration environments are planned.