Acquisition of a Fourier Transform Infrared Imaging Microscope at LDEO

LDEO 购置傅里叶变换红外成像显微镜

• 批准号: 1748684
• 负责人: Terry Plank
• 金额: $ 20.84万
• 依托单位: Columbia University
• 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: 2018-03-15 至 2020-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1748684&HistoricalAwards=false
• 关键词: Acquisition; Fourier; Transform; Infrared; Imaging; Acquisition; Fourier; Transform; Infrared; Imaging

This grant supports acquisition of an Infrared (IR) imaging microscope at Lamont Doherty Earth Observatory (LDEO) for research focused primarily on the measurement of water and carbon dioxide (CO2) in glasses and crystals. The instrument will support faculty and student research at Columbia University, the American Museum of Natural History, other universities in the region and high school teachers and students. Water and CO2 analysis is an increasingly important tool in research on volatile element effects on mantle processes, volcanic activity and the environment. Detailed understanding of the distribution and chemical behavior of water and carbon dioxide in a range of rock types and conditions will be enabled by the acquisition. Students will be trained in instrumental procedures and the instrument will serve regional institutions in the Mid-Atlantic states and New England. The acquisition will also support faculty outreach efforts to engage regional K-12 and community college students in societally relevant environmental and geohazards research. This support is congruent with NSF's mission of promoting the progress of science and advancing the national health, prosperity and welfare and training the next generation scientific workforce. The past years have seen a leap in understanding of the incorporation and diffusion of water in silicate minerals. Recent laboratory experiments have revealed infrared (IR) band-specific diffusivities in both clinopyroxene and olivine, meaning that the rate of water loss from a crystal depends on the specific defect that hosts H. Different defects can lose water at rates that vary over orders of magnitude. IR imaging becomes necessary to illuminate the zonation profiles for specific defects. Recent work finds pervasive H zonation profiles in volcanic crystals with rapid mapping, and potentially each crystal can tell its specific ascent history. Magma ascent rate is a parameter otherwise difficult to constrain, but one that may be critical to the vigor of eruption. Water zonation in minerals found in mantle xenoliths also records the timing of magma ascent and xenolith re-equilibration, essential for understanding the water content, and thus strength, of mantle lithosphere. IR imaging of water zonation in crystals and melts, at higher resolution and for greater populations of samples, has the capability to provide a new understanding of not only the volatile history of tectonic plates, but also the volatile budget, migration rate and explosive potential of magmas.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.

该赠款支持在Lamont Doherty Earth天文台（LDEO）中获取红外（IR）成像显微镜的研究，主要集中于在玻璃和晶体中测量水和二氧化碳（CO2）的研究。该乐器将支持哥伦比亚大学，美国自然历史博物馆，该地区的其他大学以及高中教师和学生的教师研究。水和二氧化碳分析是研究对地幔过程，火山活动和环境的挥发性元素影响的研究越来越重要的工具。详细了解水和二氧化碳在一系列岩石类型和条件下的分布和化学行为将通过收购来实现。学生将接受乐器程序的培训，该工具将为中大西洋州和新英格兰的地区机构提供服务。此次收购还将支持教师宣传工作，以使区域K-12和社区大学生参与社会相关的环境和地质灾害研究。这种支持与NSF的使命是促进科学进步并促进国家健康，繁荣和福利以及培训下一代科学劳动力。过去几年已经了解了对硅酸盐矿物质中水的掺入和扩散的飞跃。最近的实验室实验表明，红外（IR）带（IR）的（IR）在斜氧烯和橄榄石中均具有特异性扩散性，这意味着晶体中的水损失率取决于宿主H的特定缺陷。不同的缺陷可能以不同于数量级的速度以不同的速度损失水。 IR成像是为特定缺陷阐明分区曲线所必需的。最近的工作发现具有快速映射的火山晶体中普遍存在的H分区曲线，并且每个晶体都可以说出其特定的上升历史。岩浆上升率是一个很难约束的参数，但可能对喷发的活力至关重要。在地幔异种石中发现的矿物质中的水分区还记录了岩浆上升的时机和重新平衡的时机，这对于理解水含水层的水含量，从而强度至关重要。晶体和融化中水进行分区的IR成像，以更高的分辨率和更多的样品种群，有能力对不仅对构造板块的波动历史进行新的理解，而且还可以对NSF的法定任务和综述的范围进行评估，这反映了元素的范围。