岩石鉱物鉱床学会誌

花崗岩接触部における放射能分布ならびに元素の分布について

初田甚一郎, 西村進

1961 年 45 巻 5 号 p. 163-173
発行日: 1961/05/05
公開日: 2008/08/07

DOIhttps://doi.org/10.2465/ganko1941.45.163

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The contacts resulting from the intrusion of granitic materials into various rocks show large variations in chemical composition and alpha-activity along a traverse normal to the contact boundary. Trials of 167 sites of granite contacts have revealed that the alpha-activity variations have been found not only in wall rcoks but also in intrusive rocks, and those in the latter are more conspicuous than in the former. The shapes of variation in invading rock are tentatively classified into five types. On the other hand, studies of these variations by the analyses of closely spaced samples using semi-quantitative spectrographical method and by measurements of beta-activity have been described. The results obtained by spectrographical method indicate that across the contact of the shallow intrusive, the increase of volatile matter within the invading rock with decreasing distance from the boundary is conspicuous, but across the contact of deeper intrusive, the distributions of volatile matters are obscure, that is, distributions of all of the minor elements are averaged when high temperature and concentration gradieints prevailed. No remarkable variations in beta-activity distribution have been found across contacts in spite of the large variations in alpha-activity distributions.

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東北裏日本グリンタフ地域の基盤花崗岩質岩石

宮城一男

1961 年 45 巻 5 号 p. 174-185
発行日: 1961/05/05
公開日: 2008/08/07

DOIhttps://doi.org/10.2465/ganko1941.45.174

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壱岐島の所謂“石英玄武岩”類

応地善雄

1961 年 45 巻 5 号 p. 186-196
発行日: 1961/05/05
公開日: 2008/08/07

DOIhttps://doi.org/10.2465/ganko1941.45.186

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The so-called “quartz basalt” are distributed in the northern part of Iki island in lava flows and dikes in Pleistocene time. These rocks belong to the calc-alkali rock series derived from the contaminated alkali olivine basalt magma as pointed out by K. Aoki. From their petrographic characters, the rocks are classified into following two types, pyroxene basalt-andesite and hornblende andesite. The latter is smaller in its area and more basic than the former. Fourteen of these rocks are newly analysed and it is found that they are generally poor in MgO and richer in FeO+_Fe2_O3 than the quartz basalts from the Abu district, Yamaguchi Prefecture. Alkali contents of the quartz basalts are richer than that of the calc-alkali rock series derived from tholeiite magma and poorer than the alkali rock series. It is characteristic of these rocks to increase rapidly _K2O/_Na2O ratio as Si_O2 increases.

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松尾鉱山産鉄蛋白石に就いて

鈴木敏明

1961 年 45 巻 5 号 p. 197-200
発行日: 1961/05/05
公開日: 2008/08/07

DOIhttps://doi.org/10.2465/ganko1941.45.197

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松尾鉱床産の鉄蛋白石には脈状と角礫状の2種類があり,前者は鉱床周辺の変質帯に限られ,後者は硫黄鉱体中に産する。これらをX線回折及び顕微鏡観察によつて検討した結果,ゲーサイト及び蛋白石の飴物で,蛋白石の一部がクリストバル石,鱗珪御に結晶化していることを明らかにした。
終りに本報文作製にあたり種々御懇篤なる御指導御便宜を賜わつた東北大学竹内教授及びX線資料に便宜を与えられた東北大学南部松夫助教授に深甚なる謝意を表する。

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磁器素地中のムライト

大森啓一, 中島剛

1961 年 45 巻 5 号 p. 201-208
発行日: 1961/05/05
公開日: 2008/08/07

DOIhttps://doi.org/10.2465/ganko1941.45.201

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Mullite was found in porcelain boodies heated at 1300°C, of which electron micrographs, X-ray powder diffractions and infrared absorption spectra were described.

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