All issues
Volume 1965 (1965)
- Issue 81 Pages 1-
- Issue 80 Pages 1-
- Issue 79 Pages 1-
- Issue 78 Pages 1-
- Issue 77 Pages 1-
- Issue 76 Pages 1-
Volume 1965, Issue 80
Displaying 1-8 of 8 articles from this issue
- |<
- <
- 1
- >
- >|
-
Hokuichiro OmachiArticle type: Article
1965 Volume 1965 Issue 80 Pages ii-
Published: September 30, 1965
Released on J-STAGE: July 25, 2017
JOURNAL OPEN ACCESSDownload PDF (209K) -
Hashirimizu Research GroupArticle type: Article
1965 Volume 1965 Issue 80 Pages 1-11
Published: September 30, 1965
Released on J-STAGE: July 25, 2017
JOURNAL OPEN ACCESS1) The writers divided the Quarternary system in these district as follows. Namely, Yokosuka consisting of Horinouchi basal conglomerate, Otsu shell bearing sandstone and Mabori sandstone members, Obaradai formations and Obaradai Loam in ascending order. 2) Considering from abundant molluscan, foraminiferal and pollen fossils found from the Otsu shell bearing sandstone member, the writers assumed its sedimentary environment was an embayment, whose opening toward to north, and both of cold and mild currents poured into it. 3) Surface of the Obaradai upland is nearly fiat, whose height is 75-85 meters from the sea level, and inclined gently northwards. Sediments composing this upland are chiefly made of Hashirimizu conglomerate, although its fiat plane has been formed by the deposition of Obaradai formation, chiefly composed of granule bearing sandstone. 4) The hill-land developed in the west side of Obaradai has complex relief, whose mean height is 50-70 meters from the sea level. It probably due to the fact that the Obaradai composed of relatively permiable materials, and contralily that the hillland composed of relatively impermiable fine grained materials.View full abstractDownload PDF (1498K) -
Kiyoshi IIMURA, Shoji IJIRI, Masae OMORI, Yasuma GOHARAArticle type: Article
1965 Volume 1965 Issue 80 Pages 12-15
Published: September 30, 1965
Released on J-STAGE: July 25, 2017
JOURNAL OPEN ACCESSIn January 1964, writers found two stone-tools from the Kwanto loam in the neighbourhood of Yamagata-machi, Naka-gun Ibaraki Prefecture. Its geological horizon probably correlated to the Musashino loam in the Southern Kwanto District. And the stone-tools are made from siliceous shale belonging to the Miocene formation in these district. The one of them is core hand-axe, and the other is core scraper, both of which are worked with modern technique to make flakes and microliths.View full abstractDownload PDF (2360K) -
Yasuo SHIMAZUArticle type: Article
1965 Volume 1965 Issue 80 Pages 16-22
Published: September 30, 1965
Released on J-STAGE: July 25, 2017
JOURNAL OPEN ACCESSMovement of chemical species within the crust of the earth is described by a concept of geochemical cycle. The dynamical behavior of cycle is studied in which the transfer rates of species among continents, ocean, and ocean bottom play an important role. The cycle is modelnized as the circuit system similar to the electric network. Characteristics of the circuit at the steady state are obtained referring to data of contents of some elements, i. e., Mg, Na, Ca, K, S, and Sr isotopes. Orogenism or the material supply from the mantle to the crust is regarded as the input given to the circuit. Based upon the characteristics thus obtained, the response of the circuit to the impulsive input is discussed. It is concluded that the relaxation time to approach the steady state is less than 200 million years for various reasonable characteristics. Therefore the geochemical cycle tends to become steady before the subsequent orogenism starts of which interval is estimated as several hundred million years from geological information. A few remarks for a further study are also given.View full abstractDownload PDF (758K) -
Michihei HOSHINOArticle type: Article
1965 Volume 1965 Issue 80 Pages 23-28
Published: September 30, 1965
Released on J-STAGE: July 25, 2017
JOURNAL OPEN ACCESS1) Pieces of basement rock containing numbers of molluscan fossils have been collected by dredging along the continental slope on the west coast of the Izu Peninsula. The stations with depths sounded 1,200-1,500 m were occupied at the mouth of the Suruga Bay. The fossil molluscs belonged to species of the shallow-water type. 2) The submarine stratum containing the fossils (Table 1) is comparable with Shirahama formation distributed on the land of the Peninsula. Its geological age is believed to be somestage between the latest Miocene and the early Pliocene. 3) The fact that such a stratum as bearing characteristics of the shallow sea lies beneath the continental slope should be attributed to rise of the sea level since the late Tertiary. 4) The evidences suggest that flat plains known lying at depths of 2,000m at various localities of the ocean must have been formed around the beach-line that existed in the late Miocene. 5) The region extending from the Izu Penisula to the Izu Islands has geological structure similar to that of the Japan Sea side of the southwestern region of this country where green tuff of the Neogene is distributed over metamorphic rocks and granite. Mines which produce gold and silver are located in that region. 6) It is assumed that the Izu-Mariana arc was not formed in a single geological age and that ancient platforms may be included in the arc.View full abstractDownload PDF (699K) -
Masao GORAIArticle type: Article
1965 Volume 1965 Issue 80 Pages 29-34
Published: September 30, 1965
Released on J-STAGE: July 25, 2017
JOURNAL OPEN ACCESSDownload PDF (708K) -
Shigeo ARAMAKI, Tadahide UIArticle type: Article
1965 Volume 1965 Issue 80 Pages 37-38
Published: September 30, 1965
Released on J-STAGE: July 25, 2017
JOURNAL OPEN ACCESSDownload PDF (276K) -
Shigeo ARAMAKIArticle type: Article
1965 Volume 1965 Issue 80 Pages 38-
Published: September 30, 1965
Released on J-STAGE: July 25, 2017
JOURNAL OPEN ACCESSDownload PDF (138K)
- |<
- <
- 1
- >
- >|