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21 巻 (1976)
- 3 号 p. 153-
- 2 号 p. 65-
- 1 号 p. 1-
21 巻, 1 号
選択された号の論文の4件中1～4を表示しています
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中村 真人, 辻 和毅, 温湯 勝相原稿種別: 論説
1976 年 21 巻 1 号 p. 1-10
発行日: 1976/08/15
公開日: 2018/01/15
ジャーナル フリーFutagoyama volcanoes at Kunisaki peninsula, Kyushu, consist of many lava domes of pyroxene andesite, hornblende andesite and biotite hornblende dacite. Pumiceous deposit with two parts, stratified tuffuceous mud bed (the upper) and pumice rich bed (the lower), is found at Matamizu, the southern base of the volcanoes. Studying the deposit, it is concluded the the pumices were empted perhaps as pyroclastic flow from the Futagoyama volcanoes at its almost last stage and then deposited in the shallow water enviroment.抄録全体を表示PDF形式でダウンロード (907K) -
倉沢 一, 道野 郁原稿種別: 論説
1976 年 21 巻 1 号 p. 11-29
発行日: 1976/08/15
公開日: 2018/01/15
ジャーナル フリーIn the Izu Peninsula, Quaternary volcanoes arearranged apparently on two lines of NE direction. The volcanoes of Ida, Daruma, Tanaba, and Irozaki alkali basalts distribute on the west line in the peninsula (Fig.1). Most of the rocks of those volcanoes range in composition from basaltic andesite to andesite. Only a little alkaline basalt is represented in the southern end of the peninsula. Microscopically, the following rock types are distinguished: olivine-bearing two-pyroxene andesite (type Yd) for Darnma Volcano, olivine-augite andesite～basaltic andesite (IVc,IVb→c) for Ida Volcano, olivine-bearing hypersthene andesite (IId→c) for Tanada. Volcano, two-pyroxene andesite (Vc, Vd→c) for Tenshi and Jaishi Volcanoes, and olivine-augite basalt (IVb) of the Irozaki alkali basalts.抄録全体を表示PDF形式でダウンロード (1082K) -
桂 敬, 北山 憲三, 青柳 隆二, 笹嶋 貞雄原稿種別: 論説
1976 年 21 巻 1 号 p. 31-56
発行日: 1976/08/15
公開日: 2018/01/15
ジャーナル フリーAfter reviewed previous petrological and chemical studies on Fe-Ti oxides in igneous rocks, two facts were emphasized to develop the further study of titanomagnetite in alkali basalts, that is, (1) the oxidation state of titanomagnetite, and (2) high contents of both Mg and Al in titanomagnetite. A series of the present studies comprise two parts, and This is concerned with the background to interpretate the equilibrium compositoins of both ilmenite-hematite and ulvospinel-magnetite solid solutions during decreasing temperture. Experimental results clarified the equilibria in the FeO-Fe203-Ti02 system at 1OOO°, 1100°, 1200℃, and compared it with that obtained by Webster and Bright. By applying the results obtained by Taylor, and Buddington and Lindsley together with the present study, the equilibrium compositions of both solid solutions were explained under two conditions of constant composition of bulk mixture and constant oxygen partial pressure during decreasing temperature. The exchange reaction equilibrium, Fe2Ti04+Fe203=Fe304+FeTi03, was proposed to treat with the equilibrated compositions of ilmenite-hematite and ulvospinel-magnetite solid solutions at temperature above 1000℃.抄録全体を表示PDF形式でダウンロード (1642K) -
横山 勝三, 新井 正原稿種別: 寄書
1976 年 21 巻 1 号 p. 57-58
発行日: 1976/08/15
公開日: 2018/01/15
ジャーナル フリーPDF形式でダウンロード (261K)
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