Journal of the Japanese Association for Petroleum Technology
Online ISSN : 1881-4131
Print ISSN : 0370-9868
ISSN-L : 0370-9868
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Volume 56, Issue 2
Displaying 1-8 of 8 articles from this issue
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  • Textural and Mineralogical Properties of Turbidite Sandstone of Upper Miocene to Pliocene Tamugigawa Formation in the Niigata Basin
    Adel Ahmed Aly El HABAB, Masaaki TATEISHI, Mitsuo SHIMAZU
    1991 Volume 56 Issue 2 Pages 123-134
    Published: 1991
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.56.123
    JOURNAL FREE ACCESS
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    The Upper Miocene to Pliocene Tamugigawa Formation, distributed in the western part of the Niigata Sedimentary Basin, Northern Fossa Magna, is confined trough-filled turbidite (TAKANO, 1990). Textural properties and mineral composition of this turbidite sandstone were investigated in this study. The textural analysis shows that the turbidite sandstone is composed of sand-sized and silt- to clay-sized populations. Both populations are clearly distinguished, and are normally distributed respectively. Accordingly the sandstone is very poorly sorted and very positively skewed. Although the vertical variation of grain size distribution throughout a thick-bedded sandstone bed is generally obscure, the upward increase of quantity of fine population sometimes results in the positive grading.
    The modal analysis shows that the sandstones are mainly lithic greywacke, and have similar composition in Q-F-R diagram. However, the detail investigation of minerals and rock fragments revealed that they are classified into the following two types: one including clastics from granite together with older sedimentary rocks and volcanic rocks, and the other which doesn't include clastics derived from granite. These sandstones were supplied from the Mikuni Mountains to the northwest. Early to middle Miocene volcanic rocks covering basement rocks in the Mikuni Mountains were firstly eroded and supplied, and then granitic rocks constituting the basement were supplied as the uplift of mountains advanced.
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  • The Green-Tuff Stratigraphy in Nozoki District, Northern Margin of Shinjo Basin, Northeast Japan
    Kei BABA, Ken-ichi KOSHIKAWA, Mitsuyoshi KANEKO, Tokiyuki SATO, Takesh ...
    1991 Volume 56 Issue 2 Pages 135-147
    Published: 1991
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.56.135
    JOURNAL FREE ACCESS
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    The authors re-examined the Green Tuff stratigraphy in the Nozoki district, northen margin of Shinjo Basin, Yamagata Prefecture, Northeast Japan. The Nozoki district is the famous type locality of the lower Green Tuff in Dewa Mountains.
    The results are as follows;
    1) The Tertiary sediments of the studied area are newly divided into five lithostratigraphic units. In ascending order they are the Okatigawa Formation (the lowest Daijima-Nishikurosawa Stage), the Hatamura Formation (the lower Daijima-Nishikurosawa Stage), the Shunezaka Formation (the middle Daijima-Nishikurosawa Stage), the Kagamisawa Formation (the upper Daijima-Nishikurosawa Stage), and the Kusanagi Formation (the Onnagawa Stage).
    2) The Nozoki Formation, which has been considered to be a marine deposit at the Nishioga Stage, is completely replaced by the Okatigawa Formation which is correlated to the Daijima-Nishikurosawa Stage.
    3) The Shunezaka Formation contains the planktonic foraminifera of BLOW's N 9, and the Kagamisawa Formation contains the planktonic foraminifera of BLOW's N 10 and the nannofossils of OKADA & BUKRY's CN 5a.
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  • [title in Japanese]
    [in Japanese]
    1991 Volume 56 Issue 2 Pages 148-158
    Published: 1991
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.56.148
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1991 Volume 56 Issue 2 Pages 159-164
    Published: 1991
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.56.159
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  • [title in Japanese]
    [in Japanese]
    1991 Volume 56 Issue 2 Pages 165-169
    Published: 1991
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.56.165
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1991 Volume 56 Issue 2 Pages 170-188
    Published: 1991
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.56.170
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1991 Volume 56 Issue 2 Pages 189-198
    Published: 1991
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.56.189
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1991 Volume 56 Issue 2 Pages 199-200
    Published: 1991
    Released on J-STAGE: March 27, 2008
    DOIhttps://doi.org/10.3720/japt.56.199
    JOURNAL FREE ACCESS
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