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Noble gases in ultra-high-pressure eclogites and peridotites of the CCSD core

CCSD 岩心超高压榴辉岩和橄榄岩中的稀有气体

基本信息

批准号：
22503813
负责人：
Professor Dr. Mario Trieloff
金额：
--
依托单位：
Institut für Geowissenschaften
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 2011-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/22503813?language=en
关键词：
Noble gases ultra pressure eclogites

项目摘要

The noble gases He, Ne, Ar, Kr, Xe (altogether 23 isotopes) are important tracers for the evolution and history of mantle-derived rocks, and fluid-rock interaction with crustal or atmosphere-derived fluids. Isotope signatures of various mantle, crustal and atmospheric components, and frequently observed pronounced elemental fractionation of these components offer an enormous sensitivity to distinguish a variety of processes. While oceanic basalt glasses and mantle xenoliths from both oceanic and various subcontinental settings are characterized to increasingly better degrees, this study aims to obtain the first noble gas isotope data in UHP eclogites and peridotites, and a complete characterization of UHP rocks from the core of the Chinese Continental Scientific Drilling Program (Donghai). Isotopic compositions will allow to identify possible mantle (deep/shallow), crustal and atmosphere-derived components. The history of these components and their carrier phases and host rocks can be further constrained by fractionation processes reflected in element ratios. Correlations with oxygen isotopes and other geochemical/petrographic parameters will be achieved by cross-collaboration with other groups investigating the respective CCSD core sections. In particular, this study has the potential to yield insight into crust-mantle interaction and mantle-behaviour in convergent plate-boundaries, and fluid action within convergent plate boundaries.

稀有气体He、Ne、Ar、Kr、Xe(共23个同位素)是研究地幔岩石的演化和历史，以及流体-岩石与地壳或大气流体相互作用的重要示踪剂。各种地幔、地壳和大气成分的同位素特征，以及经常观察到的这些成分的显著元素分馏，为区分各种过程提供了巨大的敏感性。随着来自大洋和各种次大陆背景的大洋玄武岩玻璃和地幔包体的特征日益完善，本研究旨在首次获得超高压榴辉岩和橄榄岩中的稀有气体同位素数据，并对中国大陆科学钻探计划(东海)核心区的超高压岩石进行全面的表征。同位素组成将有助于确定可能的地幔(深/浅)、地壳和大气来源的成分。这些组分及其载体相和寄主岩石的历史可以进一步受到元素比值所反映的分馏过程的制约。与氧同位素和其他地球化学/岩石学参数的对比将通过与研究CCSD各核心区段的其他小组的交叉协作来实现。特别是，这项研究有可能深入了解会聚板块边界内的壳幔相互作用和地幔行为，以及会聚板块边界内的流体作用。