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

拟议的研究涉及两个地质年代学实验室之间的合作，以研究萨斯喀彻温省跨哈德逊造山带的地壳演化。具体地说，该地区被解释为一个古老的(约1.8-1.9Ga)碰撞带，其中岛弧地体的残余物被挤压到太古宙大陆边缘。PIS计划记录这一造山带发展的时空模式，并调查相关的岩浆过程，以确定来自地幔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。由于这条带被现代冰川暴露得很好，它提供了一个详细研究类似于现代喜马拉雅山脉的古老山脉带的剥离根部的机会。将利用成熟的锆石U-Pb和全岩系统学来确定关键地质单元的年龄，并作为岩石成因标志来推断岩浆来源。

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.