FTIR Spectroscopy of CO3- and OH-bearing Apatites

含 CO3 和 OH 的磷灰石的 FTIR 光谱

• 批准号: 0910902
• 负责人: Robert Tacker
• 金额: $ 18.46万
• 依托单位: Friends of the North Carolina State Museum of Natural Sciences
• 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: 2009-07-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0910902&HistoricalAwards=false
• 关键词: FTIR; Spectroscopy; CO3; OH; bearing

Apatite group minerals are made primarily of calcium and phosphate and contain smaller amounts of chlorine, fluorine, hydroxide, carbonate and sulfate. These minor components can be linked through mathematical models to gases (for example, water and carbon dioxide) that are important in many geological processes that lead not only to formation of ore deposits but also to the causes for explosive volcanism. Apatites are found in a wide variety of rocks. Therefore this study will provide the analytical and intellectual basis for an apatite-based mathematical model for carbon dioxide and water behavior in (solid or molten) rocks from the Earth's mantle to surface. One potential application is determining carbon dioxide contributions from volcanoes into the atmosphere at geologic times associated with climate change. A broader impact of this research lies in its presentation as an integral part of the North Carolina Museum of Natural Sciences' Nature Research Center, an 80,000 square foot facility designed to bring research directly to the general public through a variety of forums and media. Further impact is expected in the understanding of carbonate incorporated into tooth and bone apatite, and in the design of biomaterials. This research addresses fundamental problems with the apatite group minerals, using microanalytical techniques to enhance the thermodynamic data used in mathematical models. The project will include the development of microanalytical methods for apatites such as Fourier Transform Infrared Spectroscopy (FTIR) for the measurement of OH (hydroxyl ion) and CO3 (carbonate group) in combination with Secondary Ion Mass Spectrometry (SIMS). Diffusion of fluorine and chlorine in apatite during Electron Probe Microanalysis (EPMA) will be further examined. Apatites will be synthesized in molten salts at temperatures from 600-800°C, providing a simple system for determining (mathematical) thermodynamic data for the pure end member apatites and for the apatites containing mixtures of fluorine, chlorine and hydroxyl ions, and mixtures of hydroxyl ions and carbonate.

磷灰石基团矿物质是钙和磷酸盐的初级矿物质，并含有较少量的氯，氟，氢氧化，碳酸盐和硫酸盐。这些较小的成分可以通过数学模型与气体（例如水和二氧化碳）联系起来，这些气体在许多地质过程中都很重要，这些地质过程不仅导致了矿石沉积物的形成，还导致了爆炸性火山的原因。在各种岩石中发现了磷灰岩。因此，这项研究将为基于磷灰石的数学模型提供分析和智力基础，用于从地球地幔到表面的（固体或熔融）岩石中（固体或熔融）岩石中的水行为。一种潜在的应用是确定与气候变化相关的地质时代中火山到大气中的二氧化碳贡献。这项研究的更广泛的影响在于它作为北卡罗来纳州自然科学博物馆自然研究中心不可或缺的一部分，这是一个80,000平方英尺的设施，旨在通过各种论坛和媒体将研究直接带给公众。预计将碳酸盐融合到牙齿和骨磷灰石以及生物材料的设计中。这项研究使用微分析技术来解决磷灰石组矿物的基本问题，以增强数学模型中使用的热力学数据。该项目将包括开发用于磷灰石的微分析方法，例如用于测量OH（羟基离子）和CO3（碳酸盐组）的傅立叶变换红外光谱（FTIR），并结合了次级离子质谱法（SIMS）。将进一步研究电子探针微分析（EPMA）期间氟和氯在磷灰石中的扩散。在600-800°C的温度下，将在熔融盐中合成磷灰岩，为纯最终成员恰当和含有氟，氯，氯和羟基离子和羟基离子和羟基离子混合物的混合物的适应性提供一个简单的系统，用于确定（数学）热力学数据。