巻号一覧
24 巻 (1970)
- 6 号 p. 191-
- 5 号 p. 151-
- 4 号 p. 115-
- 3 号 p. 79-
- 2 号 p. 43-
- 1 号 p. 1-
24 巻, 6 号
選択された号の論文の9件中1～9を表示しています
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特に基底の細粒凝灰岩の生成環境について(団研速報)山形新生代研究グループ原稿種別: 本文
1970 年 24 巻 6 号 p. 191-192
発行日: 1970年
公開日: 2017/07/26
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藤井 敬三原稿種別: 本文
1970 年 24 巻 6 号 p. 193-200
発行日: 1970年
公開日: 2017/07/26
ジャーナル オープンアクセスThe stress changes which are associated with the crustal deformation have hitherto been studied by geophysists. For example, the stress changes have been calculated from such factors as the maximum displacement on the fault plane, the depth of the fault and others based on the theoretical treatment on the strike slip fault. Geologically it is believed that the thickness variation reflects the variation of the amount of vertical displacement of the crustal deformation. Numerous key beds of tuff are known in the Otadai formation of Kazusa group in the Boso Peninsula. Recent study by HIRAYAMA and SUZUKI (1968) revealed in detail the thickness variation between the Key bed O7 and K3 among above. According to them an elliptical sedimentary basin were developed there, its longer axis is 60 km and shorter axis is 30 km in length. The thickness of the strata between O7 and K3 is 6.5 m in the central part of the ellipse but decreases toward the margins. Present writer considered that the thickness variation were caused bythe crustal deformation. The writer (1970) calculated the stress changes, on the assumption that the thickness variation was equal to the variation of the vertical displacement whic was associated with the vertical force exerted under the earth crust. In this paper, the writer considered that the same thickness variation was caused by the crustal deformation as the result of the horizontal tensile force, and calculated the tensile force by finite element method. The elastic model is as follows. The writer assumed that the elastic rectangular plate (60 km in length and 30 km in height) was laid on the semiinfinite plate. Two cases were assumed. On one of the cases, the one end of the plate is fixed, the lowest part of the plate is moved laterally and the other end is moved laterally by uniform distributed tensile force. On the other cases, the small semicircle is made in the middle of the lowest part in the elastic rectangular plate, and is occupied by liquid, and other conditions are the same as the above case. Comparing with the magnitude of the vertical force by which the sedimentary basin was supposed to be caused, the result shows that the magnitude of the horizontal tensile force by which the sedimentary basin was supposed to be caused is only one-twentieth.抄録全体を表示PDF形式でダウンロード (839K) -
藤田 剛, 木村 広原稿種別: 本文
1970 年 24 巻 6 号 p. 201-207
発行日: 1970年
公開日: 2017/07/26
ジャーナル オープンアクセスThe building process of the Myoko volcano has been clarified by Myoko Research group in 1969. Then, plant remains were collected from the mud flow in the northern foot area in consequence of the breaking on the northern outside slope of the somma (mud II) for the determination of the absolute age by the use of 14C, and the numerical valve of 17,900±450 Y.B.P. years are resulted. In this paper, the analysis of the assemblage of fossil diatom found in eleven samples from the former peat deposit (30 cm in thickness) were treated, and 51 species of 21 genera were totally identified. The dominant and common species in them are Achnanthes lanceolata, Diploneis elliptica, Diatoma vulgaris, Meridion circulare Diatomella balfouriana, and all species showing low frequency in these assemblage may be characterized by rheophilious forms, which have ecological optimum in the running water and distribute comparatively in low water-temprature. From these results, the peat sediment examined are inferred to have been settled at the bottom of the lake or marsh of the low mountainland.抄録全体を表示PDF形式でダウンロード (1624K) -
近畿地方の新期新生代層の研究,その17西山団体研究グループ , 桂高校地学クラブ原稿種別: 本文
1970 年 24 巻 6 号 p. 208-221
発行日: 1970年
公開日: 2017/07/26
ジャーナル オープンアクセスThe stratigraphy of the Osaka Group in surveied area is as follows; [table] This stratigraphy is well accorded with that of the other hills which made of the Osaka Group; for example, Senriyama,Ibaraki and Hirakata Hills. Tomistoma sp. and many plant fossils yielded in this area as shown in Table 2. The paleocurrent directions deduced from cross beddings and inclination of gravels were obtained. The results are summarized in Figs. 9 and 10. Paleocurrent directions are clearly divided into two groups ; that is, from northeast to southwest and from southeast to northwest. The former may be products of the ancient river Akuta and the latter may be from the ancient river Yodo. These two directions are found at same cliff in several places.抄録全体を表示PDF形式でダウンロード (1599K) -
西村 進, 笹嶋 貞雄原稿種別: 本文
1970 年 24 巻 6 号 p. 222-224
発行日: 1970年
公開日: 2017/07/26
ジャーナル オープンアクセスThe fission-track technique is briefly described. Fission-track ages were obtained on six zircons, two hornblendes, one anthophilite and one apatite from eight ash-layers of the Plio-Pleistocene Series in Kinki district, Japan. They are compared with other paleomagnetic dates measured on these rocks. In all cases the fission-track age within its expected error agrees with the other ages.抄録全体を表示PDF形式でダウンロード (317K) -
阿哲台の鍾乳洞と河岸段丘阿哲団体研究グループ原稿種別: 本文
1970 年 24 巻 6 号 p. 225-227
発行日: 1970年
公開日: 2017/07/26
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日本の第四紀層の14C年代(60)赤木 三郎, 星見 清晴, 豊島 吉則原稿種別: 本文
1970 年 24 巻 6 号 p. 230-231
発行日: 1970年
公開日: 2017/07/26
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日本の第四紀層の14C年代(61)瀬川 秀良原稿種別: 本文
1970 年 24 巻 6 号 p. 231-232
発行日: 1970年
公開日: 2017/07/26
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日本の第四紀層の14C年代(62)大池 昭二, 高橋 一原稿種別: 本文
1970 年 24 巻 6 号 p. 232-
発行日: 1970年
公開日: 2017/07/26
ジャーナル オープンアクセスPDF形式でダウンロード (191K)
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