<FEATURE ARTICLES: Changes in the Environment and Civilizations in Turkey and Syria>Evaluation of environment using electron spin resonance(ESR) : microscope images of gypsum(CaSO4・2H2O)Microcrystals in vorehole cores at konya basin Turkey
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Some of the natural minerals formed in arid climate give information on the paleo-climate. A microwave spectroscopy of electron spin resonance, (ESR), which detects the concentration of accumulated defects produced by natural radiation, gives the age of a mineral. ESR ages of gypsum (CaSO4・2H2O) from Quaternary lacustrine sediments in Konya Basin, Turkey, were estimated using the CO3-signal as a function of the depth. The ages at 17.4 and 27.4 m were estimated to be about 37 and 62 ka and the average velocity of sedimentation from 6 to 13 m and from 17 to 16 m was determined to be about 0.4 m/ka. The distribution of two radicals (CO3- and SO2-) in crystalline gypsum was imaged using a scanning ESR microscope developed in our laboratory. The high concentration of SO2- at the center of the crystal indicates that the gypsum has grown from the center to the surface. The distribution of impurities was also checked by electron probe X-ray microanalysis (EPMA). Our scanning ESR imaging method can clarify the stripe pattern and cyclic variation of paleo-climate.
雑誌名
Nichibunken Japan review : bulletin of the International Research Center for Japanese Studies
<FEATURE ARTICLES: Changes in the Environment and Civilizations in Turkey and Syria>Evaluation of environment using electron spin resonance(ESR) : microscope images of gypsum(CaSO4・2H2O)Microcrystals in vorehole cores at konya basin Turkey
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