The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists

Mineralogical studies on the soil genesis (1); The soil of Mt. Katasone, Fukushima Prefecture I

Jun-ichi Masui

1954 Volume 38 Issue 2 Pages 41-48
Published: April 01, 1954
Released on J-STAGE: March 18, 2008

DOIhttps://doi.org/10.2465/ganko1941.38.41

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The soil profile on Mt. Katasone, Fukushima Prefecture, consists of the succession, counting from felon, as follows:
1. Soil derived from granodioritic material,
2. Soil derived from a mixture of hornblende-gabbroic material and dacitic volcanic ash,
3. Soil derived from a mixture of hornblende-gabbroic material with dacitic and andesitic volcanic ash.
On the colloidal fractions of 0.2μ-and 0.5 ?? 1.0μ, studies were made by means of chemical analysis, ??-ray powder photograph, differential thermal analysis and electron micrograph.
As the results, it was confirmed that the following clay minerals are derived:
1. Kaolinite from granodioritic material,
2. Beidellite from hornblende-gabbroic material,
3. Hydrated-halloysite from dacitic and andesitic volcanic ash.

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Geology and ore deposit of Unjô mine, Iwate Prefecture

Kenjiro Kato

1954 Volume 38 Issue 2 Pages 48-61
Published: April 01, 1954
Released on J-STAGE: March 18, 2008

DOIhttps://doi.org/10.2465/ganko1941.38.48

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Magnetitization at Kayaki-mura, Nagasaki Prefecture (II)

Kunihiko Muta

1954 Volume 38 Issue 2 Pages 61-69
Published: April 01, 1954
Released on J-STAGE: March 18, 2008

DOIhttps://doi.org/10.2465/ganko1941.38.61

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Mafic and ultramafic rocks in the Takozu district, southwestern Kitakami mountain-land (I)

Mitsuo Shimazu

1954 Volume 38 Issue 2 Pages 70-80
Published: April 01, 1954
Released on J-STAGE: March 18, 2008

DOIhttps://doi.org/10.2465/ganko1941.38.70

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Takozu district is a type locality of the Tobigamori formation, and its northern part is covered by the green rock formation. This formation is a complex of schistosed or massive green rocks, slates, quartzites, and in some parts also diabasic sheets. The stratigraphical relation between the Tobigamori and the green rock formation is probably conformable. A series of mafic and ultramafic rocks intruded into both formations, and their rock masses formed lenticular bodies arranging in the direction of N-S and their schistosity is also parallel to their trends. Of these rock masses are observed the following kinds : single bodies of serpentine in the eastern half and composite bodies, composed of schistosed meta-gabbro, amphibolite, epidote-amphibolite, pyroxenite, serpentine, and diorite in the western half. All these rock masses are thermally metamorphosed by the granodiorite exposed to the east. From their field relationship and petrographical features, following conclusions may be obtained.
1. Schistosed meta-gabbro and amphibloite series intruded first, and was followed by the intrusion of serpentine-pyroxenite series, and diorite series.
2. The first group crystallized under stress and was subjected to the hydrothermal condition owing to autometamorphism. They belong to, the so-called synkinematic intrusion, while the second group formed when the stress become weaker.
3. The age of their intrusion may be between post-Carboniferous and pre-Cretaceous and probably corresponds to that of Miyamori ultramafic intrusives.

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