Platinum Group Elements in Layered Intrusions and Submarine Glasses

本文拟对岩浆和热液环境中铂族元素（PGE）的行为进行三部分研究：(1)在海底玄武岩中硫化物球和共存玻璃（=淬火液）之间测量选定元素的分布，以评估矿物-熔体分配效应；(2)利用Os同位素数据评价两个含PGE超基性侵入体就位后的开放体系行为程度，评价热液作用对PGE重新分布的重要性；(3)将对一个含PGE体进行详细的岩石学和矿物学研究，以确定为什么PGE矿物学在该体内系统地变化。

This proposal involves a three-part investigation of the behavior of platinum group elements (PGE's) in magmatic and hydrothermal environments: (1) the distribution of selected elements will be measured between sulfide globules and coexisting glass (=quenched liquid) in submarine basalts to evaluate mineral- melt partitioning effects; (2) Os isotopic data will be used to evaluate the extent of open-system behavior following emplacement of two PGE-bearing ultramafic intrusions - this study will assess the importance of hydrothermal processes in redistributing PGE's; (3) Detailed petrographic and mineralogic studies will be carried out on one PGE-bearing body to determine why PGE mineralogy varies systematically within this body.