岩石鉱物鉱床学会誌

高温変成岩の黒雲母

清水孚道, 坂野昇平

1964 年 52 巻 6 号 p. 187-197
発行日: 1964/12/05
公開日: 2008/08/07

DOIhttps://doi.org/10.2465/ganko1941.52.187

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The phase equilibrium relationships governing the stability of biotite in high-grade pelitic schists can be studied in the system K₂0-MgO-FeO-AI₂0₃-Ti0₂-H₂O-O₂. Assuming that potassium feldspar and quartz are present in excess and that water and oxygen are mobile components, the phase equilibrium relationships may be interpreted by a tetrahedral diagram having A1₂0₃-Ti0₂-MgO-FeO at its apices.
The phase equilibeium relationships between biotite, garnet and orthopyroxene from the northwest Adirondack Mountains, Lützow-Holm Bay area, and the charnockitic terranes in Madras and Granuligebirge are dicsussed. Based on the biotite composition field, it is concluded that the rocks in the northwest Adirondack Mounains and the Lützow-Holm Bay ares belong to a similar subfacies of the granulite facies, and those in the Granulitgebirge and Madras terrane belong to another subfacies of the granulite facies that represents higher temperatures than the former. It is also concluded that the biotite composition fieid of rocks in the Emeryville area and other amphibolite facies terranes have larger stability field than the granulite facies biotite.

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東山陰地域のアルカリ玄武岩類の岩石学的研究(II)

兵庫県の玄武岩類

応地恭子, 応地善雄

1964 年 52 巻 6 号 p. 198-204
発行日: 1964/12/05
公開日: 2008/08/07

DOIhttps://doi.org/10.2465/ganko1941.52.198

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The basalts of Hyogo prefecture are composed of many trachybasalts and a few trachyandesites, being accompanied with quartz xenocryst bearing andesite which has genetic relationship with those alkali rocks. They are lava flows which erupted in the age from Pleistocene to Recent. Eight samples of them have been chemically analysed anew. The basalts are characterized with properties that : 1) The rock-type having both plagioclase and olivine phenocrysts is abundant. 2) There is hardly any biotite and zeolite. 3) Basic inclusions are not contained and a few xenocrysts are found. 4) But there is quartz basalt that belongs to the calc-alkali rock series, which is derived from the alkali rock series by the contamination of granitic rocks. 5) They have a chemical tendency to be rich in Al₂O₂ and CaO and poor in K₂O and TiO₂. This is occasioned by containing relatively many basic plagioclases.

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堆積岩中の鉄イオンについて(予報)

堆積岩の地化学的研究(II)

阿部正宏

1964 年 52 巻 6 号 p. 205-216
発行日: 1964/12/05
公開日: 2008/08/07

DOIhttps://doi.org/10.2465/ganko1941.52.205

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The writer has undertaken physical and chemical studies on the Neogene deposits distributed in Northeastern Honshu with the purpose of sedimentary petrology and environmental relationship.
During these studies he was interested in problems concerning the sedimentary facies in the basin. Actually, the writer has been studying on iron ion in the Neogene sedimentary rocks. In this paper he describes his provisional criteria for analysis of iron ion in sedimentary rocks, with his basic considerations and laboratory experiments.
The results do not explain the differeces in the properties of the iron ion and, therefore, the source rocks themselves in the different areas can not be strictly differentiated and identified. It should be pointed out that selective concentration of the iron ion in the present areas and the vertical (stratigraphical) and the horizontal (local) concentration of those iron ion are considered to be one of the environmentel factors for the formation of those source rocks.
With the accumulation of the further data it is hoped to be able to make clear the environmentel relationship existing between the volcanics characterizing marginal part of the basin and the normal sedimentaries characterizing the marine-fresh water environments.

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北部木曾地方の古生層および北上山地登米層の粘板岩の化学成分(III)

片田正人, 礒見博, 大森えい, 山田貞子

1964 年 52 巻 6 号 p. 217-221
発行日: 1964/12/05
公開日: 2008/08/07

DOIhttps://doi.org/10.2465/ganko1941.52.217

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標題の報文の最後として, carbonとCO₂の分析値を示した。
Carbonは,組粒の堆積岩より,細粒のものに多く含まれる。領家変成作用をうけたものでみると,高変成度の岩石ほど含有量が小さい。おそらく逸散したものであろう。Carbonの酸化・逸散と,鉄の還元との關係は,よく言われる所であるが,実際の分析値からみると, Carbonの逸散の原因のうちでは,鉄の還元は,ごく一部の現象にすぎない。
登米層の粘板岩のCarbonは,木曾地方の(非変成の)粘板岩のものより少量である。この場合は,おそらく鉄の還元が関係しているのであろう。
CO₂は,炭酸塩鉱物を形成している。ただし,粘板岩中では稀である

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四万十川変成帯

“紀伊半島中央部の三波川変成作用” (関陽太郎ほか)によせて

加納博

1964 年 52 巻 6 号 p. 222-224
発行日: 1964/12/05
公開日: 2008/08/07

DOIhttps://doi.org/10.2465/ganko1941.52.222

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加納博氏の批判にこたえる

関陽太郎

1964 年 52 巻 6 号 p. 224-225
発行日: 1964/12/05
公開日: 2008/08/07

DOIhttps://doi.org/10.2465/ganko1941.52.224

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