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

南极费拉尔高原玄武岩省岩浆中上地壳原位分馏过程中铂族元素的行为

• 批准号: 26949114
• 负责人: Professor Dr. Lothar Viereck
• 金额: --
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/26949114?language=en
• 关键词: Das; Verhalten; von; Platingruppenelementen; hrend

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).

我们之前的项目中研究的费拉尔大型火成岩省浅层侵入岩的 PGE 模式是根据原始地幔进行分馏的，R 和 Pd 在 Ir 和 Ru 上强烈富集 (IPGE)，与岩浆分异程度相关。虽然兼容的 IPGE 与 Ni 一样均匀耗尽，并且亲铜元素 Cu 通过进一步分化均匀富集，但 R 和 Pd 要么表现出富集，要么表现出耗尽。 MORB、海岛或溢流玄武岩环境中的任何其他火山场都未知与 Cu 的耦合富集趋势。根据现有的岩石化学和岩相学数据集，我们无法推断出可以解释 Pt 和 Pd 在分化过程中相容或不相容行为的物理化学差异。在此申请的项目中，我们将测试该模型，即浅部上地壳岩浆体在原位分异过程中的内部物理化学变化是造成观察到的分馏模式的原因。除了全岩分析之外，我们还将鉴定含铂族元素的矿物相。这些研究将专门针对已经从哥廷根大学的 Woerner 教授和 Mukasa 教授提供的窗台和 Dufek 入侵中采集的样本进行。美国密歇根州，由申请人在 2005/06 年探险 GANOVEX IX 期间拍摄。该项目旨在在两个 IPY 项目（MESCHEDE 等人，2004 年，MUKASA 2004 年）的框架内，对 Dufek 侵入体中的 PGE 内部地层进行详细调查。