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

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.

这笔赠款支持在拉蒙特·多尔蒂地球观测站 (LDEO) 购买一台红外 (IR) 成像显微镜，用于主要关注玻璃和晶体中水和二氧化碳 (CO2) 测量的研究。该仪器将支持哥伦比亚大学、美国自然历史博物馆、该地区其他大学以及高中教师和学生的教师和学生研究。水和二氧化碳分析是研究挥发性元素对地幔过程、火山活动和环境影响的越来越重要的工具。此次收购将有助于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。学生将接受仪器程序方面的培训，该仪器将为大西洋中部各州和新英格兰的地区机构服务。此次收购还将支持教师的外展工作，让地区 K-12 和社区学院的学生参与与社会相关的环境和地质灾害研究。这种支持与 NSF 促进科学进步、促进国民健康、繁荣和福利以及培训下一代科学劳动力的使命是一致的。在过去的几年里，人们对硅酸盐矿物中水的结合和扩散的理解有了飞跃。最近的实验室实验揭示了单斜辉石和橄榄石中的红外 (IR) 波段特定扩散率，这意味着晶体失水的速率取决于含有 H 的特定缺陷。不同的缺陷失水的速率可能会变化几个数量级。震级。红外成像对于照亮特定缺陷的分区剖面变得必要。最近的工作通过快速绘图发现了火山晶体中普遍存在的氢分带剖面，并且每个晶体都有可能讲述其特定的上升历史。岩浆上升速率是一个难以限制的参数，但对于喷发的活力可能至关重要。地幔捕虏体中发现的矿物中的水分带​​还记录了岩浆上升和捕虏体重新平衡的时间，这对于了解地幔岩石圈的含水量和强度至关重要。晶体和熔体中水分区的红外成像具有更高的分辨率和更多的样本数量，不仅能够提供对构造板块的挥发历史的新认识，而且能够提供对构造板块的挥发预算、迁移速率和爆炸潜力的新认识。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影响审查标准进行评估，被认为值得支持。