Abstract
The high-temperature skarn from the Uenodani outcrop of Kushiro, Tojo-Cho, Hiroshima Prefecture, Japan, was produced and then the cooling process accompanied the contaminated plutonic rock (Kusachi and Henmi, 1990). Research on the elucidation of the production mechanism of the present high-temperature skarn requires more elaborate studies of the contaminated rock.
Therefore this study proves that the present contaminated rock includes the relict of nepheline that is partially replaced by thomsonite, natrolite and analcime. Pectolite partially occur in the form of a strip line sandwiched between natrolite and analcime. Production of zeolites from the Uenodani outcrop has never been reported up to now. This finding constitutes substantial evidence for the experience of hydrothermal alteration in addition to high-temperature skarn acting.
The contaminated rocks were examined using powder XRD, EPMA and LA-ICP-MS, and micro-Raman spectroscopy and micro-FTIR. From the above results, it is concluded that the present contaminated rock had experienced the process of zeolitization. This alternation process is consistent in aspects of topology and chemistry.
