巻号一覧
59 巻, 6 号
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進野 勇1968 年 59 巻 6 号 p. 217-229
発行日: 1968/06/05
公開日: 2008/08/07
ジャーナル フリーGibbs energy changes of (Mg-Fe) distribution reaction (12) and oxidation reaction (i), (ii), (iii) are calculated on the basis of thermodynamic constant (Table 2) and experimental data (Table 1, Nafziger et al., 1967). Also it is discussed that the error of Gibbs energy changes calculated from experimental data are smaller than the other from thermodynamic constant. As a result of correspondence between Gibbs energy changes obtained from Nafziger et al. (1967) and calculated from thermodynamic data, the thermodynamic constant used in the calculation may be preferable. For the representaiton of Mg-Fe distribution constant, the equation (2) is more suitable in comparison with the equation (13) because of unity on the consideration of the Gibbs energy changes.
The stability relations of Fe-oxide and silicate are given in Fig. 2. Fe2SiO4 is more strongly persist to Po2 than FeSiO3 at high temperature but reverse at low temperature. Mg- rich olivine coexisting with Ferich pyroxene in calc-alkaline rock (Fig. 3) may be explained by the above relation.
Also it is discussed that the Mg-Fe distribution in coexisting olivine and pyroxene may be difficult to discuss simply because of non ideality of these minerals.抄録全体を表示PDF形式でダウンロード (658K) -
植田 良夫, 青木 謙一郎1968 年 59 巻 6 号 p. 230-235
発行日: 1968/06/05
公開日: 2008/08/07
ジャーナル フリーIn the Nemuro Peninsula in the eastern end of Hokkaido, sheets and lavas of mafic alkaline rocks are abundant. Stratigraphically these alkaline rocks are divided into two stages of igneous activity and are intrusive or extrusive into the Nemuro Formation. From paleontological evidence the Nemuro Formation has been regarded as Late Cretaceous in age.
The absolute age of six representative samples of the alkaline rocks has been determined by K-Ar dating. The apparent age is as follows: the first stage ranges from 88 to 65m.y. and the second stage, 84 to 67m.y. The least altered sample of the first stage gives 88m.y., and that of the second stage 84m.y. It is, therefore, concluded that the Nemuro Formation and the alkaline rocks were formed at the early stage of the Upper Cretaceous period.抄録全体を表示PDF形式でダウンロード (329K) -
関 陽太郎, 武安 忠光, 中島 三春, 大貫 仁1968 年 59 巻 6 号 p. 236-246
発行日: 1968/06/05
公開日: 2008/08/07
ジャーナル フリー花輪鉱山明通(あけどおし)鉱床母岩および鉱床付近の地表より下されたボーリングのコアには,ワイラカイトが広く見出される。ワイラカイトは,石英,曹長石,白雲母,エビドート,緑泥石などと共存する。この地域には,ほかに,ローモンタイト,スチルバイトなどの沸石も発達する。ボーリングコアの記載,各鉱物の記載をおこない,ワイラカイトを含む鉱物組合せによるグリーンタフの変質について若干の考察をおこなつた。抄録全体を表示PDF形式でダウンロード (454K)
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