Calcium distribution patterns in alkali feldspar in a quartz syenite from Oki-Dozen, southwest Japan
作者： S. Nakano
DOI: 10.1007/BF01162767
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摘要: Microscopically alkali feldspar in a quartz syenite from Oki-Dozen, Japan, consists of clear and turbid areas. Clear areas occur the interiors grains are cryptoperthitic. Film microperthites developed with turbidity rims, mosaic rims. Turbidity is attributed to presence abundant micropores. The chemical compositions pristine feldspars around Or33Ab64An3. interior microperthitic have lower An content than feldspars. Some poor calcium. In contrast, rims contain almost no zonal patterns calcium-rich cores calcium-poor very distinct all grains. overall calcium distribution suggest secondary calcium-depletion during hydrothermal or deuteric reactions. development Or-rich veins transversing rim albite consistent this model. Calcium provide new useful information on processes geologic events.
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