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Volume 37 (1953)
- Issue 6 Pages 209-
- Issue 5 Pages 167-
- Issue 4 Pages 123-
- Issue 3 Pages 83-
- Issue 2 Pages 41-
- Issue 1 Pages 1-
Volume 37, Issue 5
Displaying 1-4 of 4 articles from this issue
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Shuichi Iwao, Hiroshi Akabori, Mitsue Koizumi, Hideo Minato1953 Volume 37 Issue 5 Pages 167-178
Published: October 01, 1953
Released on J-STAGE: March 18, 2008
JOURNAL FREE ACCESSAs the results of a preliminary study in the electron micrograph of the fractured surface of some silica rocks in Japan, such as coarse-granied vein-quartz and chalcedonic vein-quartz in silicified chert, highly silicified andesite by solfatalic action, and chalcedonic sinter, it was revealed that by the present authors that;
1. In the coarse grained vein-quartz, the majority of fluid is carried in the micropores in crystals, in chalcedonic sinter, it is presumed to be involved in the interstices of ragged crystals, and in the chalcedonic, vein quartz, both in micropores and interstices.
2. The decrepigraph of the silica rocks is deeply depends upon the size of micropores, as well as upon the density of distribution of the micropores.
Further application of the electron micrograph of rock or crystal surfaces to the petrographic study is also suggested.View full abstractDownload PDF (2568K) -
Iwao Kato, Ikuro Shimada1953 Volume 37 Issue 5 Pages 178-190
Published: 1953
Released on J-STAGE: March 18, 2008
JOURNAL FREE ACCESSThe Neogene sediments in the region bodering Akita, Yamagata and Miyagi Prefectures on the southwestern foot of Kurikoma valcano are classified into following formations; these in ascending order are the Kamuroyama, Torageyama and Sanzugawa formations in the Sanzugawa basin, Akita Prefecture and the, Kanisawa, Torageyama, Akasawa and Miyazawa formations in Onikobe besin, Miyagi Prefecture.
Those two lower formations in each basin are thought to be correspond to the so-called Green tuff developed extensively in the backborn ranges between Akita and Iwate Prefectures to the east of Yokote basin and also between Yamagata and Miyagi Prefectures to the east of Shinjo basin, and consist of a heavy accumulation of green tuff and tuff breccia acconpanied by propyritic lavas.
These formations are unconformably overlain by the remarkable lacustrine deposits of the above-cited upper formations which are fairly well developed in the viscinity of Sanzugawa or Onikobe along the upper streamside of the Takamatsu or Arao River.
The fossil flora from the Sanzugawa and Akasawa formations suggest the Uppermost Miocene in age. And the origin of the Paleo-Sanzugawa and Paleo-Onikobe basins of authors is thought to be related with the Uppermost Miocene lake formed by the crustal deformation in the backborn ranges of Northern Honshu, for which Prof. Hanzawa has initiated the name of Paleo-Sendai Lake (S. Hanzawa, 1950).View full abstractDownload PDF (1186K) -
Eitaro Takahasi1953 Volume 37 Issue 5 Pages 190-193
Published: October 01, 1953
Released on J-STAGE: March 18, 2008
JOURNAL FREE ACCESSThe writer dealt with the Great Limestone Series, from middle Cambrian to middle Ordovician in age, of Sosan district of North Korea chemically and protted the data of analysis of them in CaO-MgO-Clay part diagram. The contents of MgO are well defined to each stratigraphical units but the contents of clay part are not so well defined to each units as in MgO, and shown some variations in the same unit.View full abstractDownload PDF (247K) -
J. F. Schairer, Kenzo Yagi1953 Volume 37 Issue 5 Pages 193-208
Published: October 01, 1953
Released on J-STAGE: March 18, 2008
JOURNAL FREE ACCESSDownload PDF (1094K)
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