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The geochemical behaviour of Sn and In during mantle melting and crust formation

地幔熔化和地壳形成过程中Sn和In的地球化学行为

基本信息

批准号：
234825916
负责人：
Dr. Maria Kirchenbaur
金额：
--
依托单位：
Institut für Geologische Wissenschaften
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/234825916?language=en
关键词：
geochemical behaviour Sn during mantle

项目摘要

Indium and tin are part of the moderately to highly volatile and moderately siderophile/chalcophile element group. During planetary accretion, these elements are thought to have been partially scavenged into the core as it formed and additionally delivered to the Early Earth by the Late Veneer. Indium, for example, is one of the very few elements that are more abundant in the terrestrial mantle than expected from the abundance of similarly volatile lithophile elements whereas Sn appears to be slightly depleted. However, the scarcity of high-quality data on the distribution of these elements in major terrestrial silicate reservoirs as well as the lack of systematic studies on how Sn and In behave during geological processes (e.g. mantle melting and crust formation), currently hamper sufficiently accurate estimates on the mantle abundances. Traditionally, such estimates were based on the Sn/Sm and In/Y element pairs that were long considered to be unfractionated during igneous processes. More recent Sn-In data for igneous rocks, however, appear to indicate that these element ratios are highly fractionated in some important cases, and especially in subduction zones. This project aims to obtain high-precision In-Sn data on well-characterized and carefully selected peridotites and primitive basalts in order to give important insights into (1) the distribution of In and Sn in the Earth's silicate reservoirs and the primitive mantle, (2) their behaviour during the major differentiation events of the Earth and assess the potential of In and Sn as tracers for such events, e.g., the Late Veneer, and (3) the processes that control the enrichment/depletion of Sn and In and their fractionation from similarly incompatible trace elements like Sm and Y.

铟和锡属于中等至高挥发性和中等亲铁/亲铜元素组的一部分。在行星吸积过程中，这些元素被认为在核心形成时部分被清除到核心中，并另外通过晚饰面传递到早期地球。例如，铟是地幔中为数不多的元素之一，其含量比根据类似的挥发性亲石元素的丰度所预期的要多，而锡似乎略有贫化。然而，由于缺乏关于这些元素在主要陆地硅酸盐储层中分布的高质量数据，以及缺乏对Sn和In在地质过程（例如地幔熔化和地壳形成）中如何表现的系统研究，目前阻碍了对地幔丰度的足够准确的估计。传统上，这种估计是基于 Sn/Sm 和 In/Y 元素对，这些元素对长期以来被认为在火成过程中是未分馏的。然而，最近的火成岩 Sn-In 数据似乎表明，在一些重要情况下，这些元素比例是高度分馏的，特别是在俯冲带。该项目旨在获得有关经过充分表征和精心挑选的橄榄岩和原始玄武岩的高精度 In-Sn 数据，以便对以下方面提供重要见解：(1) In 和 Sn 在地球硅酸盐储层和原始地幔中的分布，(2) 它们在地球主要分异事件期间的行为，并评估 In 和 Sn 作为此类事件示踪剂的潜力，例如晚单板，以及 (3) 过程控制 Sn 和 In 的富集/耗尽以及它们与类似不相容微量元素（如 Sm 和 Y）的分馏。