地学雑誌
Online ISSN : 1884-0884
Print ISSN : 0022-135X
ISSN-L : 0022-135X
81 巻 , 1 号
選択された号の論文の9件中1~9を表示しています
  • 前田 四郎, 千坂 武志, 浜田 隆士, 木村 達明, 田附 治夫
    1972 年 81 巻 1 号 p. 1-14
    発行日: 1972/02/25
    公開日: 2009/11/12
    ジャーナル フリー
    Under close international cooperation the research was carried out from early September in 1970 to early January in 1971 to the Andes situating between Chile and Argentina.
    The purposes of our research are as follows :
    A) To collect fossil molluscas is and plants in the field work in various localities from the stratigraphical point of view. B) To make clear what is common and what is different between the fossils in Japan and those in the Andes through the comparative study with both of them. C) To make clear the geographical distribution of fossils in Pacific region including Japan and the Andes. D) To make clear the relation between the crustal movement and the change of fossils in the geological age.
    The Andes is so wide that we divided the area for our research into five districts : Copiapo-Antofagasta, Santiago, Concepcion and its southern part (Madre de Dios), Mendoza, Patagonia and Sierra Australes, where we had the bases for the field work. The headquarters for whole research was located at Santiago, the capital of Chile. The materials collected by us in these districts were gathered at the headquarters in Santiago, and they were sent to Japan from Valparaiso harbour in Chile.
    Although the materials are being examined now, the results of the study already known are as follows :
    1) In the Cerritos Bayos near Calama, Northern Chile, the Jurassic system which was reported by BIESE in 1956, 1957 and 1961, ranging from Sinemurian to Tithonian, was clarified stratigraphically, but we could not confirm in detail BIESE's fossil zones.
    2) Limon Verde area located about 20 km south from Calama forming high plateau, are occupied by the Palaeozoic or pre-cambrian and Mesozoic groups and igneous rocks. The Jurassic system mainly consisting of the alternation of medium to coarse-grained sandstone, black shale and grey limestone, yields such molluscan fossils as Frenguelliella sp., Weyla alata (van Bum), Mactromya n. sp., Chlamys cf. textoria (Schlotheim) . Judging from the molluscan fossils, the alternation is probably lower Jurassic in age.
    3) Domeyko range is situated at the west of the Andes. The west slope of the range crops out the alternation of sandstone and shale. It was extremely folded by the crustal movement. The alternation contains such fossils as Cardinia sp., Protocardia n. sp., Astarte sp. and Thracia sp.. From these fossils it is thought that the alternation is lower Jurassic.
    The eastern slope of Domeyko range near Sal de Punta Negra consisting of the alternation of sandstone, shale and limestone, occurs the molluscas such as Eopecten sp., Pinna sp., Minetrigoniinae gen. and sp. nov. etc.
    4) In Concepcion area there were found many kinds of deposits such as Palaeozoic or pre-cambrian, Mesozoic and Cenozoic groups. There is also a broad distribution of the Palaeozoic granitic rocks forming coastal range.
    The Triassic formation along the Bio Bio river consisting of clayslate, greywacke, arkose sandstone and conglomerate is marine and non-marine deposits. From the northern area of the river many plants were collected. And some specimens of Halobia were found at the point of about 2km south of Unihue.
    The upper Cretaceous Quiriquina formation which is distributed in the Quiriquina island, is well exposed in the western and eastern sides of the island. Many molluscan fossils including Pacitrigonia were collected in the western side of the island. On the contrary, in the eastern side, many Cretaceous plants including Dicotyledoneae were newly founded in the upper part of the Quiriquina formation close with “Eocene” marine deposit.
  • 青山 高義, 石渡 千珠
    1972 年 81 巻 1 号 p. 15-20
    発行日: 1972/02/25
    公開日: 2009/11/12
    ジャーナル フリー
  • 五条 英司
    1972 年 81 巻 1 号 p. 21-26
    発行日: 1972/02/25
    公開日: 2009/11/12
    ジャーナル フリー
    いうまでもなく, 地図は, 土地に関する各種の調査研究, 事業の計画および施工, 行政, 営業, 教育あるいはレクリエーションなどに広く利用され, われわれのあらゆる活動に不可欠のものである。そして, 地図の整備状況のいかんは, 国の経済, 文化の水準を示すものといわれている。ここでは, わが国における各種の地図のうち, 国土地理院で作成している国土基本図を中心として, 大縮尺地形図の作成とその利用状況について述べてみたい。
  • 早川 正巳
    1972 年 81 巻 1 号 p. 27-47
    発行日: 1972/02/25
    公開日: 2010/02/25
    ジャーナル フリー
    人工地震・地震探査あるいは地震探鉱という言葉はすでに我々には耳なれたものであるが, 案外, その利用や現状については知られていないこともある。編集委員会からの要望に応えて, ここに筆をとつた。利用などかなり広範囲なので不充分な点があると思う。おゆるしいただきたい。
    上にしるした三つの言葉の意味は, 大体同じようなものであるが, はじめの方ほど広い意味ぐらいにとつてもらえばよかろう。本文でははじめの人工地震を用いることにする。人工地震はどのようにして発展してきたのであろうか, 最初は石油, 石炭などの地下資源をしらべることから始まつたのであるが, 次第にその応用も広まり, 更には地殻の構造解明にまで発展してきた。そのためには陸地のみならず, 海洋においての人工地震の技術が大いにあずかつて力となつたのである。
    ここではまず, 前半ではこれらの人工地震の歴史をひもとき, またその歴史と関連して, その技術の進歩が如何にその時々の関連学問, 技術の発展や社会情勢の影響をうけたかをふり返つてみる!後半では人工地震でしらべられる構造をその規模の大小に応じて, 小さな方から順次大きな方に実例を用いて説明してゆくことにする。
  • 浜田 隆士
    1972 年 81 巻 1 号 p. 48-56
    発行日: 1972/02/25
    公開日: 2009/11/12
    ジャーナル フリー
    This symposium was held in August, 1971 at Novosibirsk as the first international symposium by coral specialist with more than a hundred attendance from thirteen countries. It was well organized by the Academy of Sciences of USSR directed by the Academician Dr. B. S. SOKOLOV, and very successful in discussing about many different subjects on various groups of fossil coelenterates. About eighty papers, which were contributed from eleven countries, were read in six days.
    Two specialists from Japan, Drs. M. MINATO and T. HAMADA, took part in the symposium, and honoured the chairmanship of the sessions on the tetracorals and tabulate corals, respectively. The present reporter was strongly impressed that it was quite necessary to organize a certain kind of working group in our country as soon as possible to follow the international tendency in cooperating with the world specialists in this field of science.
  • 川上 喜代四
    1972 年 81 巻 1 号 p. 57
    発行日: 1972/02/25
    公開日: 2009/11/12
    ジャーナル フリー
    最近海洋に関する各種の研究が行なわれるようになつてきたが, その基礎となる「海の基本図」も水路部の手によつて次第に整備されてきているので簡単に紹介したい。
  • 貝塚 爽平
    1972 年 81 巻 1 号 p. 58
    発行日: 1972/02/25
    公開日: 2009/11/12
    ジャーナル フリー
  • 速水 格
    1972 年 81 巻 1 号 p. 58a-60
    発行日: 1972/02/25
    公開日: 2009/11/12
    ジャーナル フリー
  • 吉野 正敏
    1972 年 81 巻 1 号 p. Plate1-Plate2
    発行日: 1972/02/25
    公開日: 2009/11/12
    ジャーナル フリー
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