Greegor R B, Pingitore N E, Lytle F W
Boeing Company, Seattle, WA 98124, USA.
Science. 1997 Mar 7;275(5305):1452-4. doi: 10.1126/science.275.5305.1452.
An x-ray spectroscopic study of scleractinian coral skeletons indicated that, although some strontium substitutes for calcium in the aragonite structure, at concentrations of about 7500 parts per million, as much as 40 percent of the strontium resides in strontianite (SrCO3). A doublet peak in the Fourier transform of the extended x-ray absorption fine structure of the coral corresponded to six metal and 13 oxygen neighbors surrounding strontium at about 4.05 angstroms in strontium-substituted aragonite and at about 4.21 angstroms in strontianite. Thus, the mechanism of the temperature-sensitive partitioning of strontium between seawater and coral skeleton used for paleothermometry is unexpectedly complex.
一项关于石珊瑚骨骼的X射线光谱研究表明，尽管在文石结构中一些锶会替代钙，但在浓度约为百万分之7500时，多达40%的锶存在于菱锶矿（SrCO3）中。珊瑚扩展X射线吸收精细结构的傅里叶变换中的双峰对应于在锶替代文石中约4.05埃以及菱锶矿中约4.21埃处围绕锶的六个金属和13个氧原子邻居。因此，用于古温度测定的锶在海水和珊瑚骨骼之间的温度敏感分配机制出人意料地复杂。
