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.

拟议的研究的最终目标是了解盐壳液在地球更深的地壳和上层地幔中熔化过程和材料转运的作用。提出的实验将增强对俯冲区域中岩浆过程的当前理解，并衡量盐水对浅层地壳环境下花岗岩形成熔体稳定性的贡献。拟议的研究将促进对与深地球的水文循环相关的质量和传热的理解，在该水文周期中，水被俯冲带入地幔中，并释放回火山的表面。了解C-O-H挥发物在类似地面行星内部的引入，运输和存储与可居住的性质，生命的起源以及对生命有利的条件的外部证据密切相关。硅酸盐融化及其形成玻璃的能力的结构表征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库提供给公众，以及在机构网络基础架构中托管的数据存储库。一系列的讲座和实验室演示/旅行将交付给乔治·梅森大学（GMU）本科/研究生，以及一些来自GMU的本科生将在为期10周的暑期实习计划中参加该项目，建立了一项牢固的研究 - 建立了一项研究成立（CIW）与公共资助的大学（GMU）的秘密性和索尔特（GMU）。流体控制地幔通量，并影响共存相的特性，例如扩散率，电导率和粘度。这对沿中海脊，浅大陆壳和俯冲带开发的岩浆系统之间的物理和化学异质性具有深远的影响。然而，关于硅酸盐熔融液相的关系，尤其是对于富含溶解的碱，碱土和卤素离子的盐水液的知识，鲜为人知。该建议旨在探索溶解的盐，液体pH和熔融层次的影响对硅酸盐熔体和地壳盐水之间的相位关系，以更好地了解共存阶段中的熔体聚合和C-O-H溶解度。该项目将不仅将熔体流体关系限制为压力/温度的功能，而且还将相对丰度和共存阶段的组成变异性限制。在一系列水热钻石砧细胞实验中，将采用拉曼振动/红外光谱，用于对硅酸盐融化的结构，挥发性组成和与电解质富含电解质的水溶液并存的结构，挥发性组成和特性的实时研究。实验将揭示二氧化碳溶解度，网络修饰阳离子和熔融聚合的程度之间的相互作用。原位研究将通过在高温和压力下从熔融流体平衡中淬火的玻璃杯中的散装二氧化碳溶解度测量来称赞。这项工作的核心是对现场和原位实验方案的创新整合以及实时化学和光谱分析。在这项研究中，使用超纯合成钻石砧将大大提高监测原位融合液相互作用的分析方法的有效性。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛影响的审查标准来通过评估来支持的。

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.

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.

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.