ACQUISITION OF A NEW MICROFTIR SPECTROMETER TO AID EXPERIMENTAL AND ANALYTICAL STUDIES OF C-H-O VOLATILES IN THE MANTLE

购买新型显微红外光谱仪以辅助地幔中 C-H-O 挥发物的实验和分析研究

• 批准号: 0930034
• 负责人: Marc Hirschmann
• 金额: $ 10.24万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2010-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0930034&HistoricalAwards=false
• 关键词: ACQUISITION; NEW; MICROFTIR; SPECTROMETER; AID

0930034HirschmannThis award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). Deep Earth volatile cycles have a fundamental influence on our planet?s geodynamics, magmatism, atmosphere, climate, and habitability. Owing to their influence on transport properties such as viscosity, diffusivity, elasticity, and conductivity, C-H-O volatiles (including H2O, CO2, and CH4 species) have profound influence on the convective dynamics of the mantle and on its observable geophysical properties. This grant funds purchase of a new micro-FTIR spectrometer, which is a key tool for studying the concentrations of C-H-O volatiles dissolved in minerals and quenched melts. The new spectrometer will be employed principally for analyses of samples from high pressure experiments that investigate the role of volatiles on the chemical and physical properties of deep Earth materials related to cycling of volatiles in the deep Earth. Specific research projects include: (1) Partitioning of H between nominally anhydrous minerals and silicate melts; (2) Intercalibration of standards for improved accuracy of SIMS, FTIR, and EPMA, analyses of H2O in minerals and melts; (3) Low temperature FTIR investigations of OH in nominally anhydrous minerals; (4) Investigating the influence of H2O on upper mantle and transition zone seismic discontinuities; (5) Investigating the influence of H2O and CO2 on small-degree partial melting of peridotite and the origin of the Low Velocity Zone (LVZ); (6) Investigating the role of C-O-H species (CO2, CH4) on mantle melting and the role of deep planetary volatile cycles; (7) Quantifying water weakening of upper-mantle minerals; and (8) Influence of H2O on ionic diffusion in olivine. PI involvement in an NSF funded Research Experience for Undergraduates (REU) Site will facilitate student training and involvement in modern methods of materials characterization.

0930034Hirschmannthis Award是根据2009年《美国复苏与再投资法》（公法111-5）资助的。 深层挥发性周期对我们的地球动力学，岩浆，大气，气候和宜居性具有根本影响。由于它们对粘度，扩散性，弹性和电导率等传输特性的影响，C-H-O挥发物（包括H2O，CO2和CH4种）对地幔的对流动力学及其可观察的地球物理特性具有深远的影响。这笔赠款是购买新的微型距离光谱仪的资金，这是研究溶解在矿物质和淬火熔体中的C-H-O挥发物浓度的关键工具。新的光谱仪将主要用于分析来自高压实验的样品，这些样品研究了挥发物对与深层挥发物循环相关的深层材料的化学和物理性质的作用。特定的研究项目包括：（1）在名义上无水矿物质和硅酸盐熔体之间对H进行分区； （2）标准标准的插图提高了SIMS，FTIR和EPMA的精度，矿物质和熔体中H2O的分析； （3）名义上无水矿物中OH的低温FTIR研究； （4）调查H2O对上地幔和过渡区地震不连续性的影响； （5）研究H2O和二氧化碳对橄榄岩小度局部融化的影响以及低速速度区（LVZ）的起源； （6）研究C-O-H物种（CO2，CH4）对地幔熔化的作用和深行挥发性周期的作用； （7）量化上层矿物质的水削弱； （8）H2O对橄榄石离子扩散的影响。 PI参与NSF资助的本科生（REU）网站的研究经验将有助于学生培训并参与现代材料表征的现代方法。