A Study on Mossbauer Spectroscopy of Scoria at the Younger Cinder Cone, the Halla Mt. Area in Jeju Island

The scoria samples is analyzed six regions formed in the several parasitic volcano in Halla Mt. on the Jeju Island. These samples is investigated for iron oxide, mineral compositions and magnetic properties by the XRD, XRF and Mossbauer spectroscopy. The results are SiO2 is 42.74 similar to 48.69 wt%, Na2O + K2O is 4.41 similar to 5.76 wt%. These tapes are the tephrite basanite, trachybasalt and basalt. The main minerals are quartz, anorthoclase, albite and diopside. Also, we can see the iron compounds such as olivine, ilmenite, hematite, magnetite. According to Mossbauer spectroscopy on these iron compounds and most are composed of hematite and magnetite, which showing the hyperfine field. Fe3+/Fe-tot. ratio was analyzed as 59.70 similar to 75.60 %, which is analyzed around Mt. Halla cinder cones higher than the value of the other site. Therefore, this sample were able to estimate that the formation at different points in time. The area ratio between the two sixtets is smaller than 2, which is the result of overlapping maghemite, hematite, and magnetite spectra that are not clearly distinguished at room temperature.