Ammonium in high-pressure minerals - a sink for hydrogen and nitrogen in the Earth´s mantle

高压矿物中的铵——地幔中氢和氮的汇

• 批准号: 24817682
• 负责人: Professor Dr. Wilhelm Heinrich
• 金额: --
• 依托单位: Helmholtz-Zentrum Potsdam - Deutsches GeoForschungsZentrum (GFZ)
• 依托单位国家: 德国
• 项目类别: 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/24817682?language=en
• 关键词: Ammonium; pressure; minerals; sink; hydrogen

At conditions of the Earth¿s crust the ammonium ion NH4 + replaces potassium to small but significant amounts in many K-bearing minerals. It is controversially debated if a substantial amount of nitrogen is recycled into the deeper mantle during subduction processes. The crucial point of the debate is that very little is known about the geochemical behaviour of nitrogen in mantle rocks. Incorporation of ammonium into high-pressure K-bearing phases possibly provides the means for nitrogen recycling into Earth¿s mantle. Moreover, this would also provide a formidable mechanism for hydrogen transport into the deeper mantle. It appears that the potential of ammonium for large-scale recycling of hydrogen and nitrogen is unexplored. High-pressure experiments using multi anvil equipment will test the hypothesis that high-pressure K-bearing crystal structures are able to accommodate NH4, and determine up to which extent this might be possible.

在S地壳条件下，在许多含钾矿物中，氨离子NH_4+取代少量但相当数量的钾。在俯冲过程中，是否有大量的氮被循环进入地幔深处，这是有争议的。争论的关键点是，人们对地幔岩石中氮的地球化学行为知之甚少。在高压含钾相中掺入铵可能为氮循环进入S地幔提供了途径。此外，这也将为氢向地幔深处的传输提供一个强大的机制。看来，铵在氢和氮的大规模回收中的潜力还没有被开发出来。使用多个顶锤设备的高压实验将检验高压含钾晶体结构能够容纳NH4的假设，并确定这可能在多大程度上可能。

项目成果

The effect of chrysotile nanotubes on the serpentine-fluid Li-isotopic fractionation

• DOI: 10.1007/s00410-009-0454-x
• 发表时间: 2010-06
• 期刊: Contributions to Mineralogy and Petrology
• 影响因子: 3.5
• 作者: B. Wunder;F. Deschamps;A. Watenphul;S. Guillot;A. Meixner;R. Romer;R. Wirth

The OH site in topaz: an IR spectroscopic investigation

黄玉中的 OH 位点：红外光谱研究

• DOI: 10.1007/s00269-010-0365-4
• 发表时间: 2010
• 期刊: Physics and Chemistry of Minerals
• 影响因子: 1.4
• 作者: Watenphul A;Libowitzky E;Wunder B;Gottschalk M.
• 通讯作者: Gottschalk M.