Halogens in the Earth's mantle: Concentrations in nominally halogen-free mantle minerals and element partitioning during partial melting

地幔中的卤素：名义上无卤地幔矿物的浓度和部分熔融过程中的元素分配

• 批准号: 225102979
• 负责人: Professor Dr. Stephan Klemme, Ph.D.
• 金额: --
• 依托单位: Institut für Mineralogie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/225102979?language=en
• 关键词: Halogens; Earth; mantle; Concentrations; nominally

It has been well known for some time that nominally water-free minerals can store significant amount of water in Earth's mantle. This has fundamentally improved our understanding of Earth's interior as even small amounts of water are known to substantially affect phase stability, melting relations, and rheology of the mantle. The proposed project now aims to investigate, for the first time, element concentrations of Fluorine (F) and Chlorine (Cl) in a variety of mantle minerals. This could be important, as F and Cl are expected to have similar effects as water in the mantle, especially in regards to partial melting and rheological properties. F and Cl concentrations in nominally halogen-free mantle minerals are very low and will be measured with specifically designed in-situ methods, called secondary ion mass spectroscopy (SIMS). To better understand the geochemical behaviour of F and Cl in mantle rocks, and derived basalts, we will also determine the partitioning of F and Cl between mantle minerals and basaltic melts. These partition coefficients will help to understand how halogens behave during partial melting of the mantle and during fractionation of basalt.

一段时间以来，人们都知道，名义上不含水的矿物可以在地幔中储存大量的水。这从根本上提高了我们对地球内部的理解，因为即使是少量的水也会对地幔的相稳定性、熔融关系和流变性产生实质性的影响。拟议的项目现在旨在首次调查各种地幔矿物中氟(F)和氯（Cl）的元素浓度。这可能很重要，因为预计F和Cl在地幔中具有与水相似的作用，特别是在部分熔融和流变特性方面。名义上无卤素的地幔矿物中的F和Cl浓度非常低，将用专门设计的原位方法进行测量，称为二次离子质谱（SIMS）。为了更好地理解地幔岩石和衍生玄武岩中F和Cl的地球化学行为，我们还将确定地幔矿物和玄武岩熔体之间F和Cl的分配。这些分配系数将有助于了解卤素在地幔部分熔融和玄武岩分馏过程中的行为。

项目成果

The effect of fluorine on the stability of wadsleyite: Implications for the nature and depths of the transition zone in the Earth's mantle

• DOI: 10.1016/j.epsl.2017.11.011
• 发表时间: 2018-01
• 期刊: Earth and Planetary Science Letters
• 影响因子: 5.3
• 作者: T. Grützner;S. Klemme;A. Rohrbach;F. Gervasoni;J. Berndt

The storage capacity of fluorine in olivine and pyroxene under upper mantle conditions

上地幔条件下橄榄石和辉石中氟的储存能力

• DOI: 10.1016/j.gca.2017.03.043
• 发表时间: 2017
• 期刊: Geochimica et Cosmochimica Acta
• 影响因子: 5
• 作者: Grützner;Bromiley;Rohrbach;Berndt;Klemme
• 通讯作者: Klemme

The role of F-clinohumite in volatile recycling processes in subduction zones

• DOI: 10.1130/g38788.1
• 发表时间: 2017-05
• 期刊: Geology
• 影响因子: 5.8
• 作者: T. Grützner;S. Klemme;A. Rohrbach;F. Gervasoni;J. Berndt

Fluorine partitioning between eclogitic garnet, clinopyroxene, and melt at upper mantle conditions

榴辉石榴石、单斜辉石之间的氟分配以及上地幔条件下的熔融

• DOI: 10.1016/j.chemgeo.2016.05.032
• 发表时间: 2016
• 期刊: Chemical Geology
• 影响因子: 3.9
• 作者: Klemme;Grützner;Ireland
• 通讯作者: Ireland