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Speciation of palladium and ruthenium in S-bearing, sulfide-undersaturated basaltic melt - implications for enrichment mechanisms of noble metals in magmatic sulfide melt

含硫硫化物不饱和玄武岩熔体中钯和钌的形态——对岩浆硫化物熔体中贵金属富集机制的影响

基本信息

批准号：
139059925
负责人：
Professor Dr. Christian Gerhard Ballhaus
金额：
--
依托单位：
Institut für Geologie, Mineralogie und Geophysik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2009
资助国家：
德国
起止时间：
2008-12-31 至 2014-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/139059925?language=en
关键词：
Speciation palladium ruthenium bearing sulfide

项目摘要

Despite years of research, the processes governing the transfer of platinumgroup elements (PGE) from a silicate melt to a magmatic sulfide melt are not well understood. One parameter is the sulfide/silicate partition coefficient D, a concentration ratio that quantifies the affinity of a given element to sulfide in preference to silicate melt. Another parameter often invoked is the R factor. R is a measure of the silicate melt volume with which a sulfide melt must equilibrate in order to collect its PGE. Implicit in the R factor concept is the idea that high sulfide/silicate Ds can only be effective if the exsolved sulfide melt is given opportunity to come in contact with maximum amounts of silicate melt. Here, we will explore alternatives to the R factor model. By investigating the effect of S2- on the solubility of Pd and Ru in picritic silicate melt, we may quantify to what extent the PGE in silicate melt prefer the S2- ligand over O2-. If a preference exists toward the S2- ligand, exsolution of a sulfide melt will sequester all PGE-S molecules in silicate to the sulfide regardless of R. PGE enrichment in the sulfide then reflects the proportion of PGE associated with S2-, and it will be independent by physical conditions laid out by R factor model.

尽管经过多年的研究，控制铂族元素（PGE）从硅酸盐熔体转移到岩浆硫化物熔体的过程仍未得到很好的理解。其中一个参数是硫化物/硅酸盐分配系数D，这是一个浓度比，量化了给定元素对硫化物的亲和力，而不是硅酸盐熔体。另一个经常调用的参数是R因子。R是硅酸盐熔体体积的量度，硫化物熔体必须与之平衡以收集其PGE。R因子概念中隐含的观点是，只有当溶解的硫化物熔体有机会与最大量的硅酸盐熔体接触时，高硫化物/硅酸盐Ds才能有效。在这里，我们将探索R因子模型的替代方案。通过研究S2-对钯和钌在硅酸盐熔体中溶解度的影响，我们可以量化硅酸盐熔体中的PGE在多大程度上偏爱S2-配体而不是O2-。如果存在对S2-配体的偏好，则硫化物熔体的析出会将硅酸盐中的所有PGE- s分子与硫化物隔离，而不考虑R。硫化物中PGE的富集反映了与S2-相关的PGE的比例，并且与R因子模型所设定的物理条件无关。