Phase Relations Between Silicate Melts and Crustal Brines

硅酸盐熔体与地壳卤水之间的相关系

• 批准号: 1761388
• 负责人: Dionysios Foustoukos
• 金额: $ 18.59万
• 依托单位: Carnegie Institution of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-04-15 至 2022-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1761388&HistoricalAwards=false
• 关键词: Phase; Relations; Between; Silicate; Melts

The ultimate objective of the proposed study is to understand the role of saline crustal fluids on melting processes and material transport in Earth's deeper crust and upper mantle. Experiments proposed will enhance the current understanding of magmatic processes in subduction zones and gauge the contribution of saline fluids on the stability of granitic-forming melts at shallow crustal environments. The proposed study will promote understanding on the mass and heat transfer associated with the deep Earth's hydrological cycle, wherein water is carried into the mantle at subduction zones and released back to the surface at volcanoes. Understanding the introduction, transport, and storage of C-O-H volatiles in the interiors of terrestrial-like planets is profoundly linked to the nature of habitability, the origin of life, and the external evidence of conditions favorable for life. Structural characterization of silicate melts and their glass-forming abilities are directly relevant to materials and glass science. Experimental data will be made available to the public through the Library of Experimental Phase Relations, and a data repository hosted within the institution's web infrastructure. A series of lectures and lab demonstrations/tours will be delivered to George Mason University (GMU) undergraduate/graduate students, and some undergraduate students from GMU will participate in the project during a 10-week summer internship program, creating a strong partnership between a research-institution (CIW) and a public state-funded University (GMU).The solubility and solution mechanisms of volatiles in silicate melts and aqueous fluids governs mantle fluxes, and affects the properties of coexisting phases such as diffusivity, electrical conductivity and viscosity. This has a profound effect on the physical and chemical heterogeneities between the magmatic systems developed along mid-ocean ridges, shallow continental crust and subduction zones. Very little is known, however, about the silicate melt-fluid phase relations, especially for saline fluids enriched in dissolved alkalis, alkaline earths, and halogen ions. This proposal aims to explore the effect of dissolved salts, fluid pH and melt peralkalinity on the phase relations between silicate melts and crustal brines to better understand melt polymerization and C-O-H solubility in the coexisting phases. This project will constrain the melt-fluid relationships as function not only of pressure/temperature but also of relative abundances and compositional variability of the coexisting phases. In a series of hydrothermal diamond anvil cell experiments, Raman vibrational/Infrared spectroscopy will be employed for the in-situ and real-time investigation of the structure, volatile composition and properties of silicate melts coexisting with electrolyte-enriched aqueous solutions. Experiments will reveal the interplay between CO2 solubility, network-modifying cations and extent of melt polymerization. The in-situ studies will be complimented by bulk CO2 solubility measurements in glasses quenched from melt-fluid equilibria at high temperatures and pressures. At the core of this effort is an innovative integration of ex-situ and in-situ experimental protocols along with real-time chemical and spectroscopic analysis. In this study, use of ultrapure synthetic diamond anvils will increase tremendously the effectiveness of analytical methods that monitor in-situ melt-fluid interactions.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

这项研究的最终目标是了解地壳盐流体对地球更深地壳和上地幔的融化过程和物质传输的作用。所提出的实验将增强目前对俯冲带岩浆过程的理解，并衡量盐流体对浅地壳环境中花岗岩形成熔体稳定性的贡献。拟议的研究将促进对与地球深层水文循环相关的质量和热量传递的理解，其中水在俯冲带被带入地幔并在火山释放回地表。了解类地行星内部 C-O-H 挥发物的引入、运输和储存与宜居性的本质、生命的起源以及有利于生命的条件的外部证据密切相关。硅酸盐熔体的结构表征及其玻璃形成能力与材料和玻璃科学直接相关。实验数据将通过实验阶段关系图书馆以及该机构网络基础设施内托管的数据存储库向公众提供。将为乔治梅森大学 (GMU) 本科生/研究生提供一系列讲座和实验室演示/参观，部分 GMU 本科生将在为期 10 周的暑期实习项目期间参与该项目，从而在研究机构 (CIW) 和公立国家资助大学 (GMU)。硅酸盐熔体和含水流体中挥发物的溶解度和溶解机制控制着地幔通量，并影响共存相的性质，例如扩散率、电导率和粘度。这对沿大洋中脊、浅陆壳和俯冲带发育的岩浆系统之间的物理和化学异质性产生深远的影响。然而，人们对硅酸盐熔体-流体相关系知之甚少，特别是对于富含溶解碱、碱土金属和卤素离子的盐流体。本提案旨在探讨溶解盐、流体 pH 值和熔体过碱度对硅酸盐熔体和地壳卤水之间相关系的影响，以更好地了解共存相中的熔体聚合和 C-O-H 溶解度。该项目将限制熔体-流体关系，不仅作为压力/温度的函数，而且作为共存相的相对丰度和成分变化的函数。在一系列热液金刚石砧池实验中，拉曼振动/红外光谱将用于原位实时研究与富含电解质的水溶液共存的硅酸盐熔体的结构、挥发性成分和性质。实验将揭示二氧化碳溶解度、网络改性阳离子和熔融聚合程度之间的相互作用。现场研究将通过在高温高压下从熔体流体平衡淬火的玻璃中进行大量二氧化碳溶解度测量来补充。这项工作的核心是异位和原位实验方案以及实时化学和光谱分析的创新整合。在这项研究中，使用超纯合成金刚石砧将极大地提高监测原位熔体-流体相互作用的分析方法的有效性。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的评估进行评估，被认为值得支持。影响审查标准。

项目成果

Geochemistry of vapor-dominated hydrothermal vent deposits in Yellowstone Lake, Wyoming

怀俄明州黄石湖以蒸汽为主的热液喷口沉积物的地球化学

• DOI: 10.1016/j.jvolgeores.2021.107231
• 发表时间: 2021
• 期刊: Journal of Volcanology and Geothermal Research
• 影响因子: 2.9
• 作者: Tudor, Amanda;Fowler, Andrew;Foustoukos, Dionysis I.;Moskowitz, Bruce;Wang, Liheng;Tan, Chunyang;Seyfried, William E.
• 通讯作者: Seyfried, William E.

Hydrothermal oxidation of Os

• DOI: 10.1016/j.gca.2019.04.019
• 发表时间: 2019-06
• 期刊: Geochimica et Cosmochimica Acta
• 影响因子: 5
• 作者: D. Foustoukos

Revisiting water speciation in hydrous alumino-silicate glasses: A discrepancy between solid-state 1H NMR and NIR spectroscopy in the determination of X-OH and H2O

重新审视水合铝硅酸盐玻璃中的水形态：固态 1H NMR 和 NIR 光谱在测定 X-OH 和 H2O 方面的差异

• DOI: 10.1016/j.gca.2020.07.011
• 发表时间: 2020
• 期刊: Geochimica et Cosmochimica Acta
• 影响因子: 5
• 作者: Cody, George D.;Ackerson, Michael;Beaumont, Carolyn;Foustoukos, Dionysis;Le Losq, Charles;Mysen, Bjorn O.
• 通讯作者: Mysen, Bjorn O.

Suprasubduction zone ophiolite fragments in the central Appalachian orogen: Evidence for mantle and Moho in the Baltimore Mafic Complex (Maryland, USA)

阿巴拉契亚造山带中部的俯冲带蛇绿岩碎片：巴尔的摩镁铁杂岩中地幔和莫霍面的证据（美国马里兰州）

• DOI: 10.1130/ges02289.1
• 发表时间: 2021
• 期刊: Geosphere
• 影响因子: 2.5
• 作者: Guice, George L.;Ackerson, Michael R.;Holder, Robert M.;George, Freya R.;Browning-Hanson, Joseph F.;Burgess, Jerry L.;Foustoukos, Dionysis I.;Becker, Naomi A.;Nelson, Wendy R.;Viete, Daniel R.
• 通讯作者: Viete, Daniel R.

Intramolecular hydrogen isotope exchange inside silicate melts – The effect of deuterium concentration

硅酸盐熔体内部分子内氢同位素交换 – 氘浓度的影响

• DOI: 10.1016/j.chemgeo.2022.121076
• 发表时间: 2022
• 期刊: Chemical Geology
• 影响因子: 3.9
• 作者: Kueter, Nico;Cody, George D.;Foustoukos, Dionysis I.;Mysen, Bjorn O.
• 通讯作者: Mysen, Bjorn O.