巻号一覧
1960 巻, 46 号
選択された号の論文の8件中1～8を表示しています
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原稿種別: 文献目録等
1960 年 1960 巻 46 号 p. Misc1-
発行日: 1960/01/25
公開日: 2017/07/24
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山下 昇原稿種別: 本文
1960 年 1960 巻 46 号 p. i-ii
発行日: 1960/01/25
公開日: 2017/07/24
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関東ローム研究グループ原稿種別: 本文
1960 年 1960 巻 46 号 p. 1-18
発行日: 1960/01/25
公開日: 2017/07/24
ジャーナル オープンアクセスIn December 1957, the Kanto Loam Research Group (about 60 members) carried out a survey of the western region of Tokyo Bay. The object of this survey was to secure, from the view-point of stratigraphy of the volcanic ash formations of Kanto Loam, the Pleistocene geology of this region, which had been considered as a standard region of the lower Pleistocene series in Japan. This region is composed mainly of three topographical surfaces of Tama hills (70-150 m), Shimosueyoshi upland (30-50 m) and alluvial plain. As a result of this survey, the Quaternary series and their relationship with the topographical surfaces were clearly accounted for as follows: [table] In this paper, the Pleistocene series, especially from Shimosueyoshi Loam to Oshinuma Formation, are described in detail, of which some results are summarized as set forth below. Oshinuma Formation (Byobugaura F. in the southern part of this region), Shimosueyoshi F. and the alluvial deposits were deposited in shallow sea or estuary caused by rapid transgression. The base of each formation shows sunken valley topography as well as abrasion platform. The volcanic ash formations of Tama and Shimosueyoshi Loam covering conformably the marine formations of Oshinuma and Shimosueyoshi F. respectively, but the upper parts of the former layers being both eolian volcanic ashes, it is considered that Tama and Shimosueyoshi Loam both had deposited during from a transgression stage to the next regression stage. The Pleistocene series of this region are almost horizontal; they also clearly show cycles of transgression and regression as in fig.18. Consequently, this region is considered to be a convenient region to compare the Pleistocene series with the Pleistocene's of other countries from the view-point of glacial eustasy of sea-level.抄録全体を表示PDF形式でダウンロード (2211K) -
斎藤 豊, 竹下 寿, 立木 省治, 金箱 好雄, 仁科 良夫, 百瀬 善水, 北原 勇, 水上 寿英, 福島 宏原稿種別: 本文
1960 年 1960 巻 46 号 p. 19-29
発行日: 1960/01/25
公開日: 2017/07/24
ジャーナル オープンアクセスCenozoic sediments characterized by pyroclastics are developed extensively in the northeastern area of Nagano city. Since 1956, the writers have engaged in the stratigraphical researches of these strata. The results are as follows: 1) The Cenozoic strata, divided into the Ogawa, the Shigarami and the Toyono formations in ascending order, were deposited from late Miocene to early Pleistocene. Most of the sediments, however, are considered to be of Pliocene age. 2) Two partial unconformities are recognized in these sediments. A part of the uppermost member of the Shigarami formation is underlain unconformably by a part of a member of the Ogawa formation, while another unconformity may be observed between the Toyono and the Shigarami or the Ogawa formation. Of both unconformities, the writers consider that the former was originated from marine transgression during the later Shigarami stage, and the latter. on the other hand, is refered to the regression in the late Shigarami stage. 3) It is considered that the marine basin was isolated from the open sea after the transgression during the later Shigarami stage, and it was changed into a lacustrine basin to which the writers attended the name "Paleo-Toyono lake". 4) On the basis of various geological evidences obtained in this area the writers believe that the tectonic movements in the late Shigarami stage continued to the post-Toyono stage.抄録全体を表示PDF形式でダウンロード (1519K) -
湊 正雄原稿種別: 本文
1960 年 1960 巻 46 号 p. 30-37
発行日: 1960/01/25
公開日: 2017/07/24
ジャーナル オープンアクセスThat orogenetic movements corresponding to the Alps and Variscan held in Japanese islands is doubtless. The former has been called under the name of Hidaka orogenesis, while for the latter, the name of Abean orogenetic movement is newly proposed.In this paper, it is briefly presented how those mountains in those days became to high and were eroded away from the cores and how those erosional products were deposited in front. Those deposits always contain a large amount of granitic pebbles and show to be typical molasse type of conglomerates. It is uncertain about the orogenesis held prior to the Variscan movements in Japanese islands, but the presence of granite conglomerates in the Upper Devonian Tobigamori series with Cyrtospirifer and Sinospirifer fauna, is worthy of note. From the various reasons, either from the view points of volcanic activities held in Japan during the time ranging from the Silurian to Early Devonian, or probable existence of hiatus in the preUpper Middle Devonian and Upper Devonian in North Japan, I am now inclined to believe the possibility that some type of orogenic movement corresponding to Caledonian was surely held in Japan.抄録全体を表示PDF形式でダウンロード (1045K) -
島津 康男原稿種別: 本文
1960 年 1960 巻 46 号 p. 38-41
発行日: 1960/01/25
公開日: 2017/07/24
ジャーナル オープンアクセスA role of water in regional metamorphism is studied from a physicochemical aspect of the crust. It is assumed that the water squeezed out from a high grade metamorphic zone by dehydration migrates towards a low grade zone to give a source of hydration there. A thermodynamical coupling among hydration-dehydration, heat and water transfers is discussed based upon a theory of thermodynamics of irreversible processes. The transfer of water is assumed to be in a form of hydrodynamical flow through porous media. Physical causes of metamorphic processes are classified into (1) a heat concentration and (2) a stress concentration. Chemical conditions are classified into (A) a fast reaction rate and (B) a slow rate. The main results are as follows : (Case 1A) A pressure gradient is determined by an ordinary CLAPEYRON-CLAUSIUS equation and the high grade zone becomes wide with a rate of 3 km per 1 million years for reasonable physical constants. (Case 1B) A pressure gradient approaches zero for any given temperature gradient and the zone boundary does not move. (Case 2A) A temperature gradient is determined by an ordinary CLAPEYRON-CLAUSIUS equation and the high grade zone becomes narrow with a rate of 45 km per 1 million years. (Case 2B) A temperature gradient approaches zero and the high grade zone become narrow with a rate of 10 cm per 1 million years. A variety of widths of metamorphic zones for different metamophic processes depends not only upon magnitudes of pressure or temperature gradient but also upon external conditions to fix gradients. Consequently a simple analysis of zone mapping is difficult. The transfer of water due to a diffusion seems to be less effective than that due to a hydrodynamical flow even at a deeply hurried zone.抄録全体を表示PDF形式でダウンロード (525K) -
氏家 宏原稿種別: 本文
1960 年 1960 巻 46 号 p. 42-43
発行日: 1960/01/25
公開日: 2017/07/24
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勝井 義雄, 藤田 至則原稿種別: 本文
1960 年 1960 巻 46 号 p. 43-44a
発行日: 1960/01/25
公開日: 2017/07/24
ジャーナル オープンアクセスPDF形式でダウンロード (370K)
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