Investigation of the petrogenesis and geodynamics of Archean anorthosite-greenstone associations in the Superior Province and SW Greenland

为解释太古宙斜长岩-绿岩组合的成因而提出的岩石成因和地球动力学模型需要在新的高精度地球化学数据的背景下重新评估。在接下来的五年里，我计划对保存完好的新太古代费斯肯纳赛特(格陵兰岛西南部)、巴德朱利昂湖(加拿大安大略省)和多雷湖(加拿大魁北克省)层状斜长岩杂岩和空间相关的绿岩带进行全面的野外、微量元素(如LILE、REE、HFSE、过渡金属)和放射性同位素(如NdHf、Pbb)研究。这项研究的总体目标是更好地了解这一独特的太古代岩浆组合的岩石成因和地球动力学背景。该项目需要解决的具体突出问题是：(1)斜长岩浆的来源是什么？(2)斜长岩及其伴生辉长岩、超镁铁质侵入岩和镁铁质-长英质火山岩之间的岩石成因关系是什么？(3)这些岩石形成的地球动力学环境是什么？该项目的研究成果具有如下意义：(1)加深了对太古宙斜长岩成因的认识；(2)加深了对太古宙绿岩带和陆壳地球动力学成因的认识。加拿大采矿业将从这项研究中受益，因为斜长岩复合体通常含有矿藏(例如铬铁矿)。该项目将为温莎大学的两名博士生提供重要机会。其中一名学生将研究费斯肯内塞特杂岩，另一名学生将研究多雷湖和巴德朱利昂湖斜长岩杂岩以及相关的火山岩。

The petrogenetic and geodynamic models proposed to explain the origin of Archean anorthosite-greenstone associations require re-evaluation within the context of new high-precision geochemical data. Over the next five years, I plan to conduct a comprehensive series of field, trace element (e.g., LILE, REE, HFSE, transition metals) and radiogenic isotopic (e.g., Nd, Hf, Pb) studies on the well-preserved Neoarchean Fiskenaesset (SW Greenland), Bad Vermilion Lake (Ontario, Canada) and Doré Lake (Quebec, Canada) layered anorthosite complexes and spatially associated greenstone belts. The overarching objective of this study is to gain a better understanding of the petrogenesis and geodynamic setting of this distinctive Archean magmatic associations. The specific outstanding problems to be addressed by the project are: (1) what are the sources of anorthositic magmas? (2) What are the petrogenetic relationships between anorthosites and associated gabbros, ultramafic intrusions, and mafic to felsic volcanic rocks? (3) What are the geodynamic settings in which these rocks formed? The results of this project will have the following significance: (1) enhance our knowledge on the petrogenetic origin of Archean anorthosites; and (2) improve our understanding the geodynamic origin of Archean greenstone belts and continental crust. Canadian mining industry will benefit from this study given that anorthosites complexes often contain mineral deposits (e.g. chromites). The project will provide important opportunities for two PhD students in the University of Windsor. One of the students will work on the Fiskenaesset Complex and the other student will study the Doré Lake and Bad Vermilion Lake anorthosite complexes and associated volcanic rocks.