Stable Isotope Systematics of Magmatic Amphibole in Precambrian Mafic and Ultramafic Rocks

加拿大苏必利尔省太古代Abitibi-Pontiac地区和加拿大环苏必利尔带下元古代Cape Smith褶皱带的科马提岩、铁辉岩和拉斑岩流和岩岩中的岩浆角闪岩可以用来限制它们形成的母熔体的水含量和水的最终来源，这是一个为期1年的试点项目。该项目将包括：1)对基性和超基性流动和岩床中的橄榄岩、辉石岩和辉长岩中的岩浆角闪洞进行详细的岩石学分析；2)在阿拉巴马大学用电子探针对岩浆角闪洞进行详细的化学分析，如果可能的话，对其他水岩浆相（如云母和磷灰石）在选定样品中进行主要和次要微量元素（包括Cl和F）的分析；3)用质谱法分析印第安纳大学高纯度角闪孔分离物的O和H同位素组成；4)用离子探针原位分析精心挑选的角闪孔颗粒中的氢同位素，位于南西岩石与地球化学研究中心。

9526877 Lesher Funds are requested for a 1 year pilot project to prove the concept that magmatic amphiboles in komatiitic, ferropicritic, and tholeiitic flows and sills in the Archean Abitibi-Pontiac region of the Superior Province, Canada, and in the lower Proterozoic Cape Smith fold belt of the Circum-Superior Belt, Canada, can be used to constrain the H2O contents of the parental melts form which they formed and the ultimate source of the H2O. The project will involve: 1) detailed petrographic analysis of magmatic amphibole in peridotites, pyroxenites, and gabbros from mafic and ultramafic flows and sills; 2) detailed chemical analysis of magmatic amphibole and, if possible, other hydromagmatic phases such as phlogopite and apatite for major an minor trace elements (including Cl and F) in selected samples by electron microprobe at the University of Alabama; 3) analysis of high-purity amphibole separates for O and H isotopic composition by mass spectrometry at Indiana University; 4) analysis of carefully selected amphibole grains in situ for H isotopes by ion microprobe at the Centre de Recherches Petrographiques et Geochimiques, Nancy.