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

在我们以前的项目中研究的Ferrar大火成岩省的浅侵入岩的铂族元素模式分馏相对于原始地幔，R和Pd强烈富集的Ir和Ru（IPGE），与岩浆分异的程度。而兼容IPGE均匀亏损，如镍和亲铜元素铜均匀富集进一步分化，R和Pd要么表现出富集或亏损。与铜的耦合富集趋势是未知的，从任何其他火山领域的MORB，海洋岛屿或洪水玄武岩环境。根据现有的岩石化学和岩相学数据集，我们无法推断物理化学差异，可以解释兼容或不兼容的行为，铂和钯在分化。在本项目中，我们将检验上地壳浅部岩浆体在原地分异过程中内部物理化学变化对所观察到的分馏模式负责的模型。除了全岩分析，我们将确定含铂族元素的矿物相。这些研究将专门针对已从窗台和Dufek侵入体中采集的样本进行，这些样本由美国密歇根大学的Woerner教授、Goettingen教授和Mukasa教授提供，并由申请人在2005/06年的GANOVEX IX考察期间采集。该项目旨在两个IPY项目（MESCHEDE等人，2004年; MUKASA，2004年）框架内，对Dufek侵入体中铂族元素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).