COLLABORATIVE RESEARCH: Isotopic Constraints on the Crustal Evolution and Tectonic History of the Trans-Hudson Orogen, Saskatchewan

拟议的研究包括两个地质年代学实验室之间的合作努力，以研究萨斯喀彻温省跨哈德逊造山带的地壳演化。具体来说，该地区被解释为一个古老的（约1.8-1.9 Ga）碰撞带，在这个碰撞带中，岛弧地体的残余物被挤压到太古宙大陆边缘。pi计划记录该造山带发育的时空模式，并研究相关的岩浆过程，以确定地幔衍生的年轻火成岩物质相对于先前存在的地壳重熔程度的比例。由于这条带在现代冰川作用下暴露得很好，因此它提供了一个机会，可以详细研究类似于现代喜马拉雅山脉的古代山脉带的裸露根部。成熟的U-Pb锆石和全岩Sr-Nd、Rb-Sr和U-Pb系统将用于确定关键地质单元的年龄，并作为推断岩浆来源的岩石成因指标。

Proposed research involves a collaborative effort between two geochronology laboratories to study crustal evolution in the Trans- Hudson orogenic belt, Saskatchewan. Specifically, this region is interpreted to be an ancient (ca 1.8-1.9 Ga) collision zone in which remnants of island arc terranes were compressed against an Archean continental margin. The PIs plan to document time-space patterns for development of this orogenic belt and to investigate associated magmatic processes to determine the proportion mantle-derived juvenile igneous material relative to the extent of remelting of preexisting crust. Because this belt is well-exposed by modern glaciation, it offers an opportunity to study in detail the exumed roots of an ancient mountain belt that is analogous to the modern himalayas, for example. Well-established U-Pb zircon and whole-rock Sr-Nd, Rb-Sr, and U-Pb systematics will be employed to determine ages of key geologic units and as petrogenetic indicators to deduce magma sources.