巻号一覧
57 巻, 665 号
選択された号の論文の5件中1～5を表示しています
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關 陽太郎1951 年 57 巻 665 号 p. 35-43
発行日: 1951/02/28
公開日: 2008/04/11
ジャーナル フリーThe Miyamori ultrabasic mass in Iwate Prefecture is metamorphosed, at its western side, by intrusion of granodioritic rocks., The zone of metamorphism (maximum width about 4km) developed in the serpentine and serpentinized dunite may be divided, geologically as well as petrographically, into the following subzones from west to east; 1st zone: enstatite-cummingtonite-spinel zone and spinel-hornblende zone., 2st zone: tremolite-(actinolite)-anthophylite-chlorite zone., 3rd zone: tremolite-antigorite zone., 4th zone: antigorite zone., The rocks which characterize the 1st to 3rd subzones were probably formed simultaneously according to the differece in physice-chemical conditions depending on their distances from the granodiorite mass., This was immediately followed by retrogressive metamorphism during which the rocks of each of the three subzones were successively replased by minerels characteristic of the subzone directly on its east (lower grade one) and finally by antigorite., This mineral first appears as veins through the rocks of the 1st to 3rd subzones, but is finally collected togerther to form large masses which are designated as the 4th zone., There is no evidence to show that the rocks of these subzones were formed progressively from lower grade one.,抄録全体を表示PDF形式でダウンロード (1206K) -
Mitsuo NODA1951 年 57 巻 665 号 p. 45-49
発行日: 1951/02/28
公開日: 2008/04/11
ジャーナル フリーPDF形式でダウンロード (574K) -
井上 タミ, 〓城 秋穂1951 年 57 巻 665 号 p. 51-57
発行日: 1951/02/28
公開日: 2008/04/11
ジャーナル フリー中部朝鮮福辰山地方の霞石閃長岩質岩石の中に2ケ所からブェスブ石の産出が見出された。1つは含ブェスブ石・ざくろ石・黒雲母・霞石閃長岩(第1表)中に産する2mm以下の結晶(第1,2,3圖)であり、もう1つはカンクリン石閃長岩ペグマタイト中に産する約2.,5cm以下の結晶(第4,5圖,第2表)である。これまでに霞石閃長岩質岩石中にブェスブ石が見出されているのは世界で3ケ所である。この種のブェスブ石は石灰質變成岩中にでるものにくらべてAl,Tiが多くCa,Mgが少い(第6,7,8圖)。ブェスブ石は、石灰質變成岩と、霞石閃長岩質岩石と、超鹽基性岩に關係してでるが、これらの3種は化學成分も共存鑛物(第3表)も互に異つた特徴をもつている。抄録全体を表示PDF形式でダウンロード (871K) -
〓城 秋穂1951 年 57 巻 665 号 p. 59-63
発行日: 1951/02/28
公開日: 2008/04/11
ジャーナル フリー朝鮮江原道平康群縣内面細浦里の雲母片岩にともなう藍晶石・石英脈, 殊にその中にある晶洞を記載した。藍晶石・石英脈はこれまでに世界の多くの地方から記載されているが, そのなかに晶洞が報告されたことはないようである。この晶洞は藍晶石の生成條件も問題に關して,意義をもつている。抄録全体を表示PDF形式でダウンロード (929K) -
鈴木 好一, 北崎 〓香1951 年 57 巻 665 号 p. 65-78
発行日: 1951/02/28
公開日: 2008/04/11
ジャーナル フリーThis paper deals with the Pleistocene and Pliocene formations of the northern part of Miura Peninsula., We have selected at first 3 standard cross section lines, along which the stratigraphical relations are observable clearly., These are as follows: I) Totsuka-Enoshima line, II) Hino-Kamakura line, III) Tomioka-Zushi line., In the vicinity of Yokohama, 4 section lines closely located are added mainly for the purpose of tracing there the supposed anticlinolium., The formations of this area are divided into two groups, the upper, the upper the Narita and the lower the Miura., Here we refer to the Miura group only., The foraminiferal fauna of the Miura group is divided into the following 8-10 faunal units in the are surveryed., I., (Totsuka-Enoshima line): 1) Nodosaria-Nodogenerina, 2) Cibicides, 3) Elphidium-Cibicides, 4) Bulimina-Cassidulina, 5) Bulimina-Rotalia, 6) Cassidulina, 7) Pseudononion-Lagenonodosaria, 8) Pseudononion., II., (Hino-Kamakura lilne): 1) Nodosaria-Nodogenerina, 2) Cibicides-Uvigerina, 3) Elphidium-Cibicides, 4) Cibicides-Bulimina, 5) Bulimina, 6) Cassidulilna, 7) Elphidium-Cibicides, 8) Rotalia-Lagenonodosaria, 9) Pseudononion., III., (Tomioka-Zushi line): 1) Nodosaria-Nodogenerina, 2) Cassidulina-Cibicides, 3) Elphidium-Cassidulina, 4) Elphidium-Cibicides, 5) Cassidulina-Bulimina, 6) Cassidulilna-Rotalia, 7) Elphidium-Cibicides, 8) Elphidium-Planulina, 9) Pseudononion-Lagenonodosaria, 10) Pseudononion., IV., (Tomioka-Horinouchi line): 1) Bulimina, 2) Cassidulina, 3) Pseudononion., V., (Nakazato-Nishitobe line): 1) Rotalia, 2) Bulimina, 3) Pseudononion., VI., (Western side of the Yokohama Station): 1) Bulimina., VII., (Shimokashio-Kamihoshikawa line): 1) Rotalia, 2) Bulimina, 3) Pseudononion., From these faunal units we distinguished the following 6 faunal groups: 1) Nodosaria-Nodogenerina group which represents the Zushi member of the Kamakura formation 2) Cibicides-Cassidulilna-Uvigerina group which represents the Ikego member of the Kanazawa formation., 3) Elphidium-Cassidulina-Cibicides group which represents The Nojima member of the Kanazawa formation., 4) Gassidulina-Bulimina-Rotalia group which represents the Ofuna member of the Sugita formation., 5) Cassidulina-Eiphidium-Planulina group which represents the Koshiba member of the Sugita formation and the lower Nakazato member of the Sugita formation in the vicinity of Yokohama., 6) Pseudononion group which represents the typical Nakazato member of the Sugita formation., The Koshiba member has a very variable rock facies in its distribution, losing gradually its characteristics towards Ofuna, and being hardly distinguished from the Nakazato member in the vicinity of Yokohama., Elphidium-Planulina group, the typical Koshiba fauna, has changed into Cassidulina group corresponding to the variation of the rock facies., Cassidulina-Elphidium-Planulina group means both of the Cassidulina group and the Elphidium-Planulilna group, of which the former distributes widely in the are, while the latter only locally., Then the presence of an anticlinolium is ascertained in the vicinity of Yokohama, instead of the monoclinal structure as hitherto been considered.,抄録全体を表示PDF形式でダウンロード (1710K)
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