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

小行星9814336 珊瑚骨骼文石中微量元素和微量元素的结合方式和随之而来的流动性是研究人员关注的问题，他们从珊瑚的化学代用品中获得全球和局部变化的记录。 我们正在使用基于同步加速器的X射线吸收光谱法来确定原子水平上的结构位点位置（例如，在各种珊瑚和其他钙质分类群的骨骼碳酸盐中，Sr、U、Ba、Mg和Pb等元素的钙替代、缺陷占据、离散相）。 使用透射和分析电子显微镜和电子探针显微分析，我们也将进行微观结构和微观化学表征的锶矿相，我们最近记录在珊瑚文石。 知识的结构纳入是基础的开发和验证新的数据集来自镁，铀，铅，镉，钡。 该项目的结果将对研究海洋表面温度、海洋环流、海洋污染、生物矿化和碳酸盐岩石学的研究人员产生兴趣。 由于碳酸盐矿物在非海洋环境中的重要性，我们的研究结果也将对放射性核素和有毒金属的迁移问题产生影响。

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.