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Volume 28 (1974)
- Issue 6 Pages 201-
- Issue 5 Pages 151-
- Issue 4 Pages 103-
- Issue 3 Pages 71-
- Issue 2 Pages 51-
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Volume 28, Issue 6
Displaying 1-8 of 8 articles from this issue
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[in Japanese], [in Japanese]Article type: Article
1974 Volume 28 Issue 6 Pages ii-iii
Published: November 20, 1974
Released on J-STAGE: July 26, 2017
JOURNAL OPEN ACCESSDownload PDF (1236K) -
Hiromitsu YAMAGISHIArticle type: Article
1974 Volume 28 Issue 6 Pages 201-210b
Published: November 20, 1974
Released on J-STAGE: July 26, 2017
JOURNAL OPEN ACCESSThe Nukabira Area, Central Hokkaido is situated in the westernmost part of the " Kitami Green Tuff Region" and consists of Miocene lake deposits associated with basaltic pillow breccias, dykes and andesitic, rhyolitic tuff breccias. The Miocene sediments and volcanics are divided into the Horoka Formation and the Taushubetsu Formation, the former of which is intruded by a sheet of hornblende-pyroxene andesite (some 400m thick) and dykes of quartz porphyry. Two kinds of basaltic pillow breccias can be distinguished (1) isolated-pillow breccias which contain unbroken pillows widely separated from one another by a tuffaceous matrix and (2) broken-pillow breccias consisting of disaggregated pillow fragments in a tuffaceous matrix. The hornblendepyroxene andesite is large sheet intruding the Horoka Formation. On the basis of mineral assemblages of zeolites and clay minerals, these volcanic rocks are divided into following three zones; I zone montmorillonite-mordenite-(heulandite) IIa zone chlorite/montmorillonite mixed layer mineral-montmorillonite-prehnite-laumontite zone lib zone cholorite-prehnite-laumontite zone Clay minerals, such as montmorillonite and chlorite/montmorillonite mixed layer mineral, and laumontite and mordenite fill amygdales concentrically, and replace phenocrysts and groundmass, etc, Prehnite, epidote, calcite and quartz occurr between these minerals and as veins. It seems to be that the main alteration has been due to hydrothermal solutions in the diagenetic process and corresponds to zeolite-prehnite pumpellyite facies.View full abstractDownload PDF (2604K) -
Akira KAWAZOEArticle type: Article
1974 Volume 28 Issue 6 Pages 211-217
Published: November 20, 1974
Released on J-STAGE: July 26, 2017
JOURNAL OPEN ACCESSIn this paper, a description of the Tertiary system, which is named the Muroto Peninsula Group, in the northern part of Muroto peninsula, Kochi prefecture, is presented. The Muroto Peninsula Group in this area is divided into the Noneyama Formation, the Futamata Formation and the Takeyashiki Formation in ascending order by rock facies. The Noneyama Formation consists of massive sandstone, alternations of sandstone and shale, and shale. This is about 2,800 meters in thickness. The Futamata Formation is separated from the Noneyama Formation by the Jadani Fault, and consists of massive sandstone, alternations of sandstone and shale, and shale. This is about 3,000 meters in thickness. The Takeyashiki Formation is connected with the Futamata Formation by the Todoro Fault. The Takeyashiki Formation, about 2,000 meters in thickness, is massive sandstoue, alternations of sandstone and shale, shale and conglomerate which contains gravels of metemorphic rocks. The strikes of the strata of the Muroto Peninsula Group show E-W to EEN-WWS. The important folds observed in the Futamata Formation form a wavy succession of anticline and syncline. There are seven faults in this area, namely, from south to north, the Iwasa Fault, the Jadani Fault, the Hiranabe Fault, the Sugenous Fault, the Todoro Fault, the Otani Fault and the Kuki Fault respectively.View full abstractDownload PDF (808K) -
KANTO QUATERNARY RESEARCH GROUPArticle type: Article
1974 Volume 28 Issue 6 Pages 218-235
Published: November 20, 1974
Released on J-STAGE: July 26, 2017
JOURNAL OPEN ACCESSThe Quaternary system in South Kanto is supposed to be a standard succession of middle-upper Pleistocene in Japan. However, there are many problems especially in its lower half. The authors have progressd reexamination about these problems, based on the study by Y. Otuka(1973), Y. Naruse (1960) and others, and succeded to Kanto Loam Research Group (1965). In our previous work in 1970, we have discussed on the Tsurumi Formation which was covered by Shimosueyoshi Formation unconformably. However the relation to the Byobugaura Formation was not certain in that time. So the necessity to reexamine the so-called Byobugaura Formation, has happened in order to establish and clarify the Quaternary system, especially middle Pleistocene, which had been regarded as the transgressive deposit before the Shimosueyoshi stage in South Kanto. The conclusion introduced by our investigation are as follows. 1) So-called Byobugaura Formation is distinguished into several units showed in following table. Each unit is composed of the neritic deposit (printed in Gothic letter) and is succeded by thick volcanic ash (so-called loam) on its upper part. Though, in some cases, especially in Totsuka Formation and Maioka Formation, neritic deposit and loam change into each other in laterally. 2) Each neritic deposit gradually changes its facies from bottom to top, mud facies (burying the -bottom of valleys with peaty silt and fossil shell) -coarse grained facies (granule-pebble sized gravel or sand)^loam. Such cyclic change of facise is seen in each unit. 3) The development of these units in this area suggests repeated sea-level changes, and the transitional change of sedimentary basin effected by crustal movements in the Quaternary history of South Kanto.View full abstractDownload PDF (2119K) -
Yoshikazu HAYAMAArticle type: Article
1974 Volume 28 Issue 6 Pages 236-251
Published: November 20, 1974
Released on J-STAGE: July 26, 2017
JOURNAL OPEN ACCESSIn the previous paper, the writer examined the So-called Nevadan orogeny of the American geologists and reached the following conclusion: the Nevadan orogeny is not orogeny in a traditional sense in geology. It is not accompanied by the eugeosynclinal thick piling of sediments and their folding with Contemporaneous regional metamorphism, but represented by acid volcanism in subaerial to subaqueous circumstances and by plutonism in unsinkitig region. The Navadan orogeny should be used as a synonym with our Hiroshima or Yenshan movement, which includes the Ryoke metamorphism as its fore-runner. In this paper, the writer examined the Paleozoic orogenies. In the Cordillera, two orogenies are recognised. One is the Antler orogency in the Late Carboniferous. Regional metamorphism reached the epidote amphibolite facies and the amphibolite facies in some parts in the western margin of the geosyncline. The other is the Sonoma orogeny in the Latest Permian to the Earliest Triassic. In the western side of the Antler metamorphic belt, there took place the regoinal metamorphism of the low temperature-high pressure type with the sporadic formation of glaucophane schist. Since the Late Paleozoic, the tectonic history is simmilar in both the North American Cordillera and Japanese Islands of the southeastern margin of the Asiatic continent. The Sanbagawa metamorphic belt corresponds to the Sonoma. metamorphic belt and the Jurassic to Cretaceous geosyncline including the Franciscan corresponds to the Shimanto geosyncline. Moreover, the Mesozoic acid igneous activities are similar in both regions. These common features in both regions are considered to be a fundamental attribute of the Circum-Pacific region and should be studied in the light of the tectonic history of the Pacific Ocean.View full abstractDownload PDF (1777K) -
Masao GORAIArticle type: Article
1974 Volume 28 Issue 6 Pages 252-256
Published: November 20, 1974
Released on J-STAGE: July 26, 2017
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Motoaki ODA, Seiki YAMAUCHI, Hisashi MURAKAMIArticle type: Article
1974 Volume 28 Issue 6 Pages 257-258
Published: November 20, 1974
Released on J-STAGE: July 26, 2017
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14C-Age of the Quaternary Deposits in Japan (104)Fumitake SHIMIZU, Shuichi OKAZAWA, Takashi KOAZEArticle type: Article
1974 Volume 28 Issue 6 Pages 259-260
Published: November 20, 1974
Released on J-STAGE: July 26, 2017
JOURNAL OPEN ACCESSDownload PDF (254K)
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