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Volume 45, Issue 1
Displaying 1-6 of 6 articles from this issue
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Basaltic rocks from the Otsu district, Yamaguchi Pref.Yoshio Oji1961 Volume 45 Issue 1 Pages 1-8
Published: January 05, 1961
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSFrom geological relation and petrographic characters the Cenozoic basaltic rocks of the Otsu district are classified into the following three rock series; (1) andesites of the tholeiitic rock series, (2) in Neogene, and (3) trachybasalts of the alkali rock series in Pleistocene. Six samples of the former two series and two of the later are chemically analysed. Petrographic characters of the tholeiitic rock series and trachybasalts in this district closely resemble to that of the Ko-yama andesite and the basal lavas of alkali rocks in the Abu district. Existence of phenocrystic pigeonite in Tsuo andesites is also very noticeable fact.View full abstractDownload PDF (458K) -
Ryuichi Yashima1961 Volume 45 Issue 1 Pages 9-13
Published: January 05, 1961
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSIn Senganmori, southeast of Fukushima City, is found volcanic neck which was intruded into the basement consisting of granites, during the period of sedimentation of the Ryozen formation (middle Miocene). Lithologically these volcanic rocks are defined as compact andesitic basalts having scarce phenocrysts. The phenocrysts are diopside, rhombic pyroxene, pigeonite, bytownite, and olivine replaced by cholorite. The groundmass consists of pigeonite, augite, bytownite to labradorite, and brown glass. The mode of occurrence of pigeonite phenocrysts shows the following four types: (I) occurrng as single crystals, (2) forming rims around diopside phenocrysts and intergrowing with the latter, (3) inverted from rhombic pyroxene and (4) surrounding augite and in the intergrowth relation with the latter. The chemical composition of pyroxenes, obtained through measurements of their optical properties, are plotted in Fig. 5. It is understood from the figure that the crystallization course of augite from Senganmori roughly coincides with that of augite in the Skaergaard intrusion and that the augite crystallized out in the stage generally corresponding to pigeonite.View full abstractDownload PDF (277K) -
Jujin Suzuki1961 Volume 45 Issue 1 Pages 14-16
Published: January 05, 1961
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSThe tuff distributed in the southern part of Chita Peninsula, Aichi Prefecture belongs to the Miocene sediments, in which clinoptilolite was found as an alteration product of an acid volcanic glass. The mineral was identified by X-ray diffraction, differential thermal analysis and microscopic observation.View full abstractDownload PDF (434K) -
Studies on the source-rock of petroleun (7th report)Masahiro Abe1961 Volume 45 Issue 1 Pages 17-24
Published: January 05, 1961
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSIn order to acquire the knowledge on the source rock of petroleum, the writer has carried out the chemical analyses on the rock samples of the Tertiary sediments developed in the neighbourhood of Yashima, Hitane and Momoyake at the eastern foot of Chokai Volcano, Akita Prefecture, and has determined the extractive organic constituents of the fine grained clastic sediments, so-called “black shale” and “hard shale”, Moreover he has studied on the relationship between the stratigraphic distribution of the organic constituents and the source rocks themselves.View full abstractDownload PDF (515K) -
Eikichi Narita, Masao Hirama1961 Volume 45 Issue 1 Pages 25-30
Published: January 05, 1961
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSSeveral types of ore deposits are arranged in the Katsuraoka mineralized zone, which contains the unique magnetite deposits of the Katsuraoka mine, Hokkaido.
The distinctive variations in mineral paragenesis of magnetite, such as spinel-pyroxene-biotite, garnet-diopside or actinolite-epidote-quartz-sulphide minerals and lattice parameter of magnetite and other iron-oxide minerals of the deposits are the features which attract the nost attention. These characteristic features are differentiated according to the depositional stages of formation of each mineral.View full abstractDownload PDF (379K) -
S.K. DE1961 Volume 45 Issue 1 Pages 31-38
Published: January 05, 1961
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSPhosphate adsorption capacity of two samples of kaolinites (Indian kaolinite and Georgia kaolinite) was studied with eight phosphate solutions of different pH. A comparison is made between their adsorping capacities for phosphate ions in order to arrive at reasonable explanations for this phenomenon. The adsorption of phosphate ions by kaolinites is said to involve release of hydroxyl ions from the minerals which may be a simple substitution or it may be due to reactions with hydrous iron oxide or hydrous aluminium oxide surface films. This conclusion is made on the basis of higher adsorption from acid phosphate solutions since there is greater possibility of release of hydroxyl ions in such media. In the acidic medium, adsorption is said to be primarily due to the precipitation of iron and aluminium phosphates while in the alkaline medium it is mainly due to the formation of calcium and magnesium phosphates. At all pH levels studies Indian kaolinite recorded higher adsorption of phosphate ions than Georgia kaolinite, since in the former a lower silica/sesquioxide ratio and a higher content of two important divalents were observed in comparison to the latter.View full abstractDownload PDF (352K)
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