Incorporation of Minor and Trace Elements in Coral Skeletal Aragonite: An X-Ray Absorption Spectroscopy and Microstructural Study

珊瑚骨骼文石中微量元素和微量元素的掺入：X 射线吸收光谱和微观结构研究

• 批准号: 9814336
• 负责人: Nicholas Pingitore
• 金额: $ 23万
• 依托单位: University of Texas at El Paso
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-02-15 至 2004-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9814336&HistoricalAwards=false
• 关键词: Incorporation; Minor; Trace; Elements; Coral

9814336Pingitore The mode of incorporation and consequent mobility of the trace and minor elements in coral skeletal aragonite are a concern to researchers who derive records of global and local change from chemical proxies in corals. We are using synchrotron-based x-ray absorption spectroscopy to determine the structural site location at the atomic level (e.g., substitution for calcium, occupation of defects, discrete phase) of such elements as Sr, U, Ba, Mg, and Pb in the skeletal carbonate of a variety of corals and other calcareous taxa. Using transmission and analytic electron microscopy and electron probe microanalysis, we also will perform microstructural and microchemical characterization of the strontianite phase which we recently documented in coral aragonite. Knowledge of structural incorporation is fundamental to the development and validation of new data sets being derived from Mg, U, Pb, Cd, and Ba. The project results will be of interest to researchers studying sea surface temperatures, ocean circulation, marine pollution, biomineralization, and carbonate petrology. Because of the importance of carbonate minerals in surficial non-marine environments, our results also will have bearing on problems in radionuclide and toxic metal migration.

9814336Pyitore的融合方式和随之而来的轨迹骨骼骨骼骨骼元素的迁移率是从珊瑚中的化学代理中获得全球和局部变化记录的研究人员的关注。 我们正在使用基于同步加速器的X射线吸收光谱来确定原子水平的结构位置位置（例如，钙的替代，缺陷的占用，离散阶段，离散阶段），例如Sr，U，U，Ba，Ba，Mg和Pb，在各种珊瑚和其他山脉群中的骨骼碳酸盐中， 使用传输和分析电子显微镜以及电子探针微分析，我们还将对Strontianite相进行微结构和微化学表征，我们最近在珊瑚aragonite中进行了记录。 结构融合的知识是从MG，U，PB，CD和BA得出的新数据集的开发和验证基础。 研究海面温度，海洋循环，海洋污染，生物矿化和碳酸盐质学的研究人员将感兴趣。 由于碳酸盐矿物质在表面非海洋环境中的重要性，我们的结果也将与放射性核素和有毒金属迁移的问题有关。