Das Verhalten von Platingruppenelementen während oberkrustaler in situ - Fraktionierung in Magmen der Ferrar Plateaubasaltprovinz, Antarktis

前期项目研究的费拉尔大火成岩省浅层侵入岩pge模式对原始地幔进行了分异，R和Pd在Ir和Ru （IPGE）上富集较强，与岩浆分异程度相关。相容的IPGE像Ni一样均匀富集，亲铜元素Cu随着进一步分化而均匀富集，而R和Pd则表现为富集或富集。与Cu的耦合富集趋势在MORB-、洋岛-或洪水玄武岩环境中是未知的。基于现有的岩石化学和岩石学数据集，我们无法推断出可能解释Pt和Pd在分化过程中相容或不相容行为的物理化学差异。在这里申请的项目中，我们将测试一个模型，即浅层上地壳岩浆体在原位分化过程中的内部物理化学变化是观察到的分馏模式的原因。除了全岩分析外，我们还将确定含pge的矿物相。这些研究将只在美国密歇根大学Woerner教授、Goettingen教授和Mukasa教授提供的已经从sills和Dufek入侵中采集的样本上进行，这些样本是申请人在2005/06年度GANOVEX IX探险期间采集的。该项目旨在在两个ipy项目（MESCHEDE et al. 2004, MUKASA 2004）的框架内开始对Dufek侵入体的PGE内部地层进行详细调查。

The PGE-patterns of shallow intrusive rocks of the Ferrar Large Igneous Province studied within our previous project are fractionated with respect to primitive mantle, R and Pd being strongly enriched over Ir and Ru (IPGE), correlating with the degree of magma differentiation. While the compatible IPGE are uniformly depleted like Ni and the chalcophile element Cu is uniformly enriched with further differentiation, R and Pd either exhibit enrichment or depletion. The coupled enrichment trend with Cu is unknown from any other volcanic field in MORB-, ocean island- or flood basalt environments. Based on the existing data set on rock chemistry and petrography we are unable to deduce physicochemical differences that may explain the compatible or incompatible behaviour of Pt and Pd during differentiation. Within the project applied here for, we will test the model that internal physicochemical variations in shallow upper crustal magma bodys during in situ - differentiation are responsible for the observed fractionation patterns. Aside from whole-rock analyses we will identify the PGE-bearing mineral phases. These studies will be performed exclusively on already taken samples from sills and the Dufek Intrusion provided by Prof. Woerner, Goettingen, and Prof. Mukasa, Univ. of Michigan, USA and taken by the applicant during the expedition GANOVEX IX in 2005/06. The project is intended to be the initiation of detailed investigations on the PGE internal stratigraphy in the Dufek Intrusion within the framework of two IPY-projects (MESCHEDE et al. 2004, MUKASA 2004).