RUI: Crystal Growth Speedometry, Micro-Fourier Transform InfraRed (FTIR) Spectroscopy of Minerals

摘要：本文的主要目的是利用水热晶体在结晶过程中引入的h族缺陷来确定不同晶面的相对生长速率，从而可以通过适当的实验校准来得出晶体原位生长的绝对时间。石英和蓝晶石将被研究。晶体生长过程所涉及的时间尺度限制很差，从火成岩或变质环境中生长的晶体所涉及的绝对时间是未知的。这是岩石学中的一级问题，很少有人提出新的方法来解决它。虽然描述地壳环境中反应动力学的理论是健全的，但定量研究很少，单个晶面大小和形状变化的机制仍然不清楚。在我们的实验室中获得的关于天然自体石英晶体的已发表数据允许对其生长历史中生长面的相对生长速率进行定量测定。生长时晶体结构中掺入的水分子和金属羟基杂质的浓度作为“速度计”，直接反映了活性生长面的生长动力学。这些测量提供了一种新的方法来成像晶体在其生长过程中的形状和绝对尺寸。与商业石英生产公司的合作伙伴关系将提供用于实验校准流体参数的合成样品，这是定量解释天然热液石英晶体h缺陷数据所必需的。

AbstractEAR-0126285IhingerUniversity of Wisconsin-Eau ClaireThe primary objective of this proposal is to use H-species defects, incorporated into hydrothermal crystals during crystallization, to determine the relative growth rates of different crystallographic faces, which in turn may be used to derive the absolute time for in situ crystal growth, with appropriate experimental calibration. Quartz and kyanite will be investigated. The timescales involved in crystal growth processes are poorly constrained and the absolute time involved in the growth of crystals from either igneous or metamorphic environments is not known. This is a first order problem in petrology and few new approaches have been proposed to attack it. Although the theory describing reaction kinetics in the crustal environment is sound, few quantitative studies exist and the mechanisms responsible for the variation in size and shape of individual crystal faces are still not well understood. Published data on natural euhedral quartz crystals obatined in our laboratory allow quantitative determination of the relative growth rates of their growth faces throughout their growth histories. The concentration of water molecules and metal hydroxyl impurities incorporated into the crystal structure at the time of growth serve as "speedometers" that directly reflect the growth kinetics of active growth faces. These measurements provide a new means of imaging the shape and absolute dimensions of crystals throughout their growth history. A partnership with commercial quartz production company will provide synthetic samples for experimental calibration of fluid parameters, which are necessary to quantitatively interpret H-defect data from natural hydrothermal quartz crystals.