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首页> 外文期刊>Meteoritics & planetary science >Cathodoluminescence microscopy and spectroscopy of forsterite from Kaba meteorite: An application to the study of hydrothermal alteration of parent body
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Cathodoluminescence microscopy and spectroscopy of forsterite from Kaba meteorite: An application to the study of hydrothermal alteration of parent body

机译：卡巴陨石中镁橄榄石的阴极荧光显微镜和光谱学：在研究母体水热蚀变中的应用

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摘要

Highly forsteritic olivine (Fo: 99.2-99.7) in the Kaba meteorite emits bright cathodoluminescence (CL). CL spectra of red luminescent forsterite grains have two broad emission bands at approximately 630 nm (impurity center of divalent Mn ions) in the red region and above 700 nm (trivalent Cr ions) in the red-IR region. The cores of the grains show CL blue luminescence giving a characteristic broad band emission at 400 nm, also associated with minor red emissions related to Mn and Cr ions. CL color variation of Kaba forsterite is attributed to structural defects. Electron probe microanalyzer (EPMA) analysis shows concentrations of Ca, Al, and Ti in the center of the forsterite grain. The migration of diffusible ions of Mn, Cr, and Fe to the rim of the Kaba meteoritic forsterite was controlled by the hydrothermal alteration at relatively low temperature (estimated at about 250 °C), while Ca and Al ions might still lie in the core. A very unusual phase of FeO (wüstite) was also observed, which may be a terrestrial alteration product of FeNi-metal.
机译：Kaba陨石中的高度镁橄榄石（Fo：99.2-99.7）发出明亮的阴极发光（CL）。红色发光镁橄榄石晶粒的CL光谱在红色区域的大约630 nm（二价Mn离子的杂质中心）和在红色IR区域的700 nm（三价Cr离子）以上具有两个宽的发射带。晶粒的核心显示CL蓝色发光，在400 nm处具有特征性的宽带发射，还与与Mn和Cr离子有关的少量红色发射相关。卡巴镁橄榄石的CL颜色变化归因于结构缺陷。电子探针显微分析仪（EPMA）分析显示镁橄榄石晶粒中心的Ca，Al和Ti浓度。 Mn，Cr和Fe的可扩散离子向Kaba陨石镁橄榄石边缘的迁移是通过在相对较低的温度下（估计约为250°C）的水热蚀变来控制的，而Ca和Al离子仍可能位于核中。还观察到非常不寻常的FeO（白钨矿）相，这可能是FeNi-金属的地球蚀变产物。

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