栃木鉱山木戸ケ沢鉱床附近の第三紀層中の氷長石

抄録

Tertary pyroclastic (andesitic and liparitic) sediments of the Kinugawa district are regionally altered into the assemblages of chlorite, epidote, serictite, calcite, sodic plagioclase, quartz and monoclinic potashfeldspar (adularia). No zeolite has been found in these pyroclastic rocks. mineralogical and petrological characters of the adularia-bearing rocks are described in some detail.