巻号一覧
32 巻 (1978)
- 6 号 p. 267-
- 5 号 p. 225-
- 4 号 p. 175-
- 3 号 p. 113-
- 2 号 p. 51-
- 1 号 p. 1-
32 巻, 4 号
選択された号の論文の10件中1～10を表示しています
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前島 渉原稿種別: 本文
1978 年 32 巻 4 号 p. 175-184a
発行日: 1978/07/25
公開日: 2017/07/26
ジャーナル オープンアクセスThe Triassic geosynclinal strata, the crystalline schists and the Cretaceous strata are distributed in the north of Yuasa. In this article, the structural relationship between the crystalline schists and the Triassic strata was investigated. The crystalline schists separately occur in two zones, south and middle parts of the present area. Detailed field investigation resulted in that the crystalline schists in the both zones are in fault contact with the Triassic strata. The low-angle thrust in the south part and both low-angle thrust and high-angle fault in the middle part are recognized. The low-angle thrusting prior to the high-angle faulting, similality of the original lithologic facies of the crystalline schists in the both zones, close association of the crystalline schists and the Cretaceous strata in their distribution and unconformity between the crystalline schists plus the Triassic strata and the overlying Cretaceous rocks are worthy of note in clarifying the history of structural relationship between the crystalline schists and the Triassic strata. It may be concluded that the crystalline schists in the both zones lay as a continuous body above the Triassic strata with the low-angle thrust during the early Jurassic period. The low-angle thrusting may be inferred to be a result of gravity gliding of the crystalline schists over the Triassic strata, which was probably related to marked uplifting of the members of the Kurosegawa Tectonic Zone.抄録全体を表示PDF形式でダウンロード (2095K) -
富山県布施川上流地域の第三系の地質構造野村 忠昭, 米道 博, 藤田 至則原稿種別: 本文
1978 年 32 巻 4 号 p. 185-193
発行日: 1978/07/25
公開日: 2017/07/26
ジャーナル オープンアクセスAt the base of the Nirehara Formation, ranging in age from the latest Oligocene to the earliest Miocene, there is a member of ill-sorted breccias, which abuts unconformably against the Hida Metamorphic Rocks of the basement complex. A zone of concealed sheared rocks, about 100 m wide and apparently produced by faulting, is found in the basement area near the unconformity. The zone, running from north to south, is nearly parallel to the boundary line, i.e. the line of the unconformity, and is overlain unconformably, in some areas, by the Nirehara Formation. These facts suggest that there was, in the initial stage of the Nirehara sedimentation, a fault scarp along the margin of the sedimentary basin, and that the above-mentioned breccia member was being laid down in forms of talus breccias or fanglomerates (or rather piedmont alluvial fans). The breccia member at the base of the Nirehara Formation is overlain conformably by conglomerates with round boulders, which, in turn, are overlain conformably by sandstone member. The Nirehara Formation is succeeded conformably by the Iwaine Formation, which is made up of pyroclastic rocks of the so-called "green tuff formation". In the southern part, where no breccias are found, these members and formations overlap successively the subjacent ones and finally lie on the gently inclined surface of the Hida Metamorphics. These facts suggest that the fault scarp had been worn down when the round-stone conglomerates were being deposited, and that either basin subsidence of sea-level rise succeeded the conglomerate deposition. The sequence of sediments from the base of the Nirehara Formation to the Iwaine Formation reveales a tectonic sequence of, 1) collapse, 2) subsidence, and 3) volcanism. A different scheme of tectonic sequence is proposed by FUJITA et al. (1970), in which, 1) collapse resulting from rising volcanic magma, 2) volcanism, and 3) subsidence occur successively. The relations of the subsidence in this area to the preceding collapse as well as to the following volcanism are not well understood as yet, and are merely noticed in this paper.抄録全体を表示PDF形式でダウンロード (1254K) -
窪田 英夫原稿種別: 本文
1978 年 32 巻 4 号 p. 194-200c
発行日: 1978/07/25
公開日: 2017/07/26
ジャーナル オープンアクセスFossil diatoms in the silts attached to the lower molar teeth of Stegodon aurorae found from Marukomachi, Nagano Prefecture, were studied. Among 20 genera 41 forms which were found in the present material, Melosira granulata and Cocconeis placentula var. lineata, were counted as dominant and subdominant respectively, being ocupied 21% and 10% of the total value numbers counted. On the basis of the autoecology of the identified species especialy of that of dominant and subdominant ones which were designated as oligohalobus, indifferent, alkaliphilous and limnophilous, the paleontological environment where the teeth of Stegodon aurorae was deposited, was presumed to be alkaline, fresh water lake or pond.抄録全体を表示PDF形式でダウンロード (2306K) -
長谷川 力原稿種別: 本文
1978 年 32 巻 4 号 p. 201-204
発行日: 1978/07/25
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 (496K) -
木村 方一, 佐藤 芳雄, 後藤 秀彦原稿種別: 本文
1978 年 32 巻 4 号 p. 205-207
発行日: 1978/07/25
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 (523K) -
外崎 与之原稿種別: 本文
1978 年 32 巻 4 号 p. 208-209
発行日: 1978/07/25
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 (1271K) -
清水 大吉郎原稿種別: 本文
1978 年 32 巻 4 号 p. 210-215
発行日: 1978/07/25
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 (978K) -
坂 幸恭原稿種別: 本文
1978 年 32 巻 4 号 p. 216-217
発行日: 1978/07/25
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 (292K) -
日本の第四紀層の14C年代(125)福岡策四紀研究グループ原稿種別: 本文
1978 年 32 巻 4 号 p. 218-220
発行日: 1978/07/25
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 (306K) -
日本の第四紀層の14C年代(126)井上 克弘原稿種別: 本文
1978 年 32 巻 4 号 p. 221-223
発行日: 1978/07/25
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 (340K)
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