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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
Published for geochemistry community from Geochemical Society of Japan.

Evaluation of the ambient environment of mineral (gypsum(CaSO4·2H2O)) growth by ESR microscope

Tetsuji Omura, Motoji Ikeya
Geochemical Journal, Vol. 29, No. 5, P. 317-324, 1995


The distribution of two radicals (CO3- and SO2-) in natural crystalline gypsum in a bore-hole core from the Konya basin in Turkey was imaged using a home-made electron spin resonance (ESR) microscope. The high concentration of SO2- at the center of the crystal indicates that the gypsum has grown from the center to the surface. The high concentration of CO3- at the surface would be caused by the external β-rays from sediments. The distribution of impurities was also checked by electron probe X-ray microanalysis (EPMA).

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