PGE的地球化学性质及其分配系数的实验研究进展

Geochemical characteristics of platinum-group elements and their laboratory partitioning determination

随着现代化仪器的发展和分析方法的改进,对PGE的分析技术已经取得突破。PGE已经成为岩石学、矿床学和地球化学的一个重要研究领域。本文系统综述了PGE和Au元素的分配系数实验的研究进展,区分和总结了适用于岩浆硫化物矿床的实验数据。根据此实验数据发现仅用硫化物液相不混熔模型难以解释岩浆硫化物矿床的高PGE_Au含量,提出应该增加考虑岩浆后期的熔体或流体活动对PGE_Au元素的再富集过程。同时介绍一些关于PGE数据处理的常用方法及其应用。

With the development of modem analysis, great breakthrough in PGE measurement has been achieved. Platinum group elements（PGEs） can now be regarded as one of the important fields in petrology, ore deposits and geochemistry. At present, the PGEs are becoming an increasingly important element group to trace the characteristics of geochemical processing. In this paper, the new data of laboratory partitioning of platinum- group elements and gold are summarized from literature abroad. The results of the controlled atmosphere experiments have yielded more S-rich sulfides, which seem to be the most appropriate laboratory data to be applied to magmatic sulfide-PGE deposits. It is also found that the sulfide liquid immiscibility model alone can not account for the apparently high concentration of PGE-Au in PGE-Au sulfide reef deposits based on these laboratory partitioning coefficients, suggesting the existence of extensive transformation and enrichment by either rock-melt process or rock-fluid process during the protracted post-accumulation and late magrnatic history of large igneous bodies.