Hydrothermal History of the Stillwater Complex

该项目将继续对Stillwater侵入杂岩进行详细的研究，目的是了解高温水岩浆环境及其在重新动员微量元素组分(特别是。铂族元素)和蚀变杂岩的原生堆积岩。将使用(A)作为地层高度的函数的水合相(例如，磷灰石)的成分变化和脉体与堆积岩的组成变化，(B)微量元素收支的质量平衡，(C)流体来源的稳定同位素证据，(D)对密集参数的相平衡的限制，来检验岩浆与热液流体的运移模型)。以及(E)高温下矿物在氯离子卤水中的溶解度的初步实验研究。

This project will continue detailed studies of the Stillwater Intrusive Complex with the goal of understanding the high tempera- ture hydromagmatic environment and its role in remobilizing trace element components (esp. platinum-group elements, or PGEs) and altering the primary cumulate rocks of the complex. Models of magmatic vs. hydrothermal fluid transport of PGEs) will be tested using (a) compositional variations of hydrous phases (e.g. apatite) as a function of stratigraphic height and in veins vs. cumulate rocks, (b) mass balance of trace element budgets, (c) stable isotope evidence for origin of fluids, (d) phase equilibria constraints on intensive parameters, and (e) preliminary experimental investigations of mineral solubilities in Cl-brines at high temperature.