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Volume 56, Issue 655
Displaying 1-9 of 9 articles from this issue
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Masao Minato1950 Volume 56 Issue 655 Pages 143-148
Published: August 20, 1950
Released on J-STAGE: April 11, 2008
JOURNAL FREE ACCESSDie Vergleichung dieser Formationen ausser der Onimaru-Serie mit der europaischen bzw., amerikanischen Gliederrungen kann man infolge des Mangels an Fossilien nur mit grosster Schwierigkeit durchfuhren ; das Vorkommen von Productella cf., caperata (Sowerby), Genus Planoproductus, Leptaena convexa Weller, "Reticularia" von so-genannte Tornyfer typ und zwei Arten von Actinccrinus, die A., polydactylus, A., asperrimus sehr nahe sind, zeigt aber, dass die Hikoroiti-Serie der Etroeungt-Schichten, bzw., Unteren Teil des Tournai-Serie entsprechen., Die Fossilieninhalt der Hikoroiti-Serie sind wie folgend : Planoproductus gigantoides Minato, Leptaena convex Weller, Leptaena analoga (Phillips), Spirifer spp., Spirifer ultratransversa Minato, Delthyris sp., Tylothyris laminosa var., nipponica Minato, Aclinoconchus planosulcata (Phillips), "Reticularia" tyoanjiensis Minato, "Reticularia" semicircularis Minato, "Reticularia" hikoroitiensis Minato, Productella cf., caperata (Soweby), Spirifer ohmoriensis Minato, Lithophaga tyoanjiensis Minato, Conularia tyoanjiensis Sugiyama, Palaeophyllipsia japonica Sugiyama et Okano, P., cf., kitakamiensis Sugiyama, Aclinocrinus ohmoriensis Minato, Actinocrinus, higutisawaensis Minato, Schizophoria sp., Schellwienella sp., Delthyris aff., clarksvillensis (Winchel), Spirifer (Brachythyris) sp., Tylothris cf., laminosa (M' Coy), Spirifer cf., logani Hall, Spirifernina paratransversa Minato, usw.,View full abstractDownload PDF (829K) -
Masao GORAI1950 Volume 56 Issue 655 Pages 149-156
Published: August 20, 1950
Released on J-STAGE: April 11, 2008
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Masao MINATO1950 Volume 56 Issue 655 Pages 157-159
Published: August 20, 1950
Released on J-STAGE: April 11, 2008
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Kenji Togari1950 Volume 56 Issue 655 Pages 161-165
Published: August 20, 1950
Released on J-STAGE: April 11, 2008
JOURNAL FREE ACCESSThe coloring of anhydrite is generally attributed to calcium colloid., But this has not been previously established by accurate experiments on anbydrites of various colors., The color is not due to the difference of the constituent elements, for significant differences in chemical composition are shown neither by chemical analysis nor hy spectrum analysis., Also, Au which has often been regarded as the cause of coloring, is not detected even by spectrum analysis., The presence of calcium colloid, on the other hand, seems to be improbable, thouth not decidedly stated, by X-ray diffraction data and electron microscopic observations., From the author's opinion, the color in anhydrite is probably due to the presence of F-center and related phenomena., This hypothesis is supported by the results of discoloration in thermal experiments and visible light exposures, and the revival of color by X-ray exposures.,View full abstractDownload PDF (699K) -
Hisashi KUNO1950 Volume 56 Issue 655 Pages 167-172
Published: August 20, 1950
Released on J-STAGE: April 11, 2008
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Ryohei Morimoto, Masao Minato, Shoji Ijiri1950 Volume 56 Issue 655 Pages 173-180
Published: August 20, 1950
Released on J-STAGE: April 11, 2008
JOURNAL FREE ACCESSIn the Southwestern Japan, especially in Ki'i peninsula and in Shikoku Island, the regional land deformation took place associated with Nankai Great Earthquake of Dec., 21, 1946., The revision of levelling was performed by the Geographical Survey Beureau of the Constructional Ministry soon after the event., Some considerations on the land deformation has been offered by various authors in correlation with the geologic structure of Southwestern Japan., Such discussions must be preceded by the precise examination of the change of levelling at the geological standpoint., The writers carried out geological observation along the levelling route from Matsuyama to Sakawa throuth the highland Shikoku., The bench mark displacements are divided in two types., The one indicates remarkable downward displacement which are almost exclusively settled on the unstable foundation, such as the talus or loose surface soil, not directly on the basal rocks., This remarkable displacement may be ascribed to the mere local geologic condition of the surface deposit, representing no true crustal movement., The other indicates the general trend of the vertical displacement, tilting to southern direction of the crust or the partial manifestation of the downward warping of Shikoku Island in large scale with the axis of approximately EW-direction., The trend of the movement indicated by the algebraic sum of the change of height of the bench marks during 1939 to 1947 is quite opposite to that of the movement during from 1896 to 1939 in which no great earthquake was involved., Topographic feature of this region also indicates the upwarping of the region in the younger geologic age., No remarkable discontinuity is recognized in the geologic structure of the older strata.,View full abstractDownload PDF (1033K) -
Hiromu MUKAIYAMA1950 Volume 56 Issue 655 Pages 181-187
Published: August 20, 1950
Released on J-STAGE: April 11, 2008
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Eitaro TAKAHASHI, Gentaro NAITO1950 Volume 56 Issue 655 Pages 188
Published: August 20, 1950
Released on J-STAGE: April 11, 2008
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Noboru Yamashita1950 Volume 56 Issue 655 Pages 189-192
Published: August 20, 1950
Released on J-STAGE: April 11, 2008
JOURNAL FREE ACCESS1) This district is divided by E-W strike faults into nine narrow zones., Kobayashi and Iwaya reported "the imbricaed structure with low-angled thrust planes" in the Sakuradani area east of the present district, but the faults in the latter district are always vertical., Therefore, "Decke" structure as described by Kobayashi and Iwaya cannot be supported, so far as the present district is concerned., 2) The Paleozoic and Mesozoic formations differ remarkably from each other in rock facies and in distribution., The rocks of the former are more strongly disturbed than those of the latter., These facts suggest that the crustal movement before the deposition of the Middle Triassic Zohoin series might have been stronger than that hitherto been considered., 3) The differences between the upper Triassic Kochigatani series and the Middle Triassic Zohoin are rather slight compared with those between the Paleozoic and the Zohoin., And thus the two series form a group more or less sharply distinguished from the Paleozoic and Younger Mesozoic formations., 4) The younger Mesozoic formations from another group, covering the older formations clino-unconformably., They are roughly correlated with the so-called Torinosu-Ryoseki-Monobegawa series, ranging from the Upper Jurassic to Lower Cretaceous., The unconformity at their base shows that a folding movement occurred already in the Jurassic Period., 5) The Palezoic and Mesozoic formations were folded and faulted after the deposition of the so-called Monobegawa series., According to T., Kobayashi, the "imbricated structure of the Sakuradani area" may be a product of his "Sakawa Orogenesis of Sakawa Phase", that is Middle Cretaceous in age., But the present writer supposes from his study in the "Katsuragawa Basin" to the NEE of the present district that the Middle Cretaceous crustal movement was not so strong as thought by Kobayashi, and that the most important movement occurred after the deposition of the Upper Crertaceous formation of the Hanoura district., 6) Among three types of igneous rocks, the Takamarusan Igneous Body, gabbro and diorite, intruded into the Paleozoic formation., Serpentines occur as thin intrusives along some of the E-W faults., A granodiorite, seen along the northernmost fault, shows a cataclastic texture.,View full abstractDownload PDF (698K)
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