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| 1009-1018, 2 FIGS., OCTOBER 1948 PETROGRAPHY OF IWO JIMA BY GORDON A. MACDONALD CONTENTS Page 1009 1009...Tuff Motoyama intrusive bodies Lava of Suribachiyama Suribachiyama cinder cone Syenite inclusions Fumarolic...map of Iwo Jima 2. Map showing location of Iwo Jima Page 1010 1013 ABSTRACT The rocks of Iwo Jima are...are listed. Fumarolic gases have altered some rocks to a mixture of opal and clay minerals and have cemented...petrography of Iwo Jima (Sulfur Island) has been discussed by Tsuya (1936)1. The writer can add little to Tsuya's |
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| (1970) Andesine Megacrysts in Alkali Basalts from Japan K ~ - ~ c m R o AOKI Institute of Mineralogy, Petrology...University, Sendai, Japan Received November 18, 1969 Abstract. Andesine megacrysts up to 3 cm in size occur...basalts and allied marie rocks in southwestern Japan. They are sometimes accompanied by megacrysts of...conditions at a depth of about 30 to 60 km. Introduction Andesine megacrysts up to 3 cm in length occur sporadically...Cenozoic alkaline rock province of southwestern Japan. More than twenty localities are now known throughout |
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| J. Japan. Assoc. Min. Petr. Econ. Geol. 74, 1-15, 1979. PETROLOGICAL STUDY OF THE SOUTH YUBARA QUARTZ...QUARTZ GABBROIC MASS, OKAYAMA PREFECTURE, SOUTHWEST JAPAN MASAKATSU Geothermal The Research South Sangun... Yubara of in inner the divided tonalitic to part into part of that ilmenite, facies the...minerals of The type the composed facies . Japan. facies The similar biotite, is the color...would porphyritic be and attributed have lower to fugacity. In the Yubara area the outline of INTRODUCTION |
