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The Empirical Study of Benefit Assessment for Landscape Improvement of Temporary Open Space in Taipei City
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Does “Adversity Strengthen the Foundation?” Change in Japanese Residents’Place Attachment after Typhoon No. 19 in 2019
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Variation in the Built Form of Neighborhoods of Different Socio-Economic Groups
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K-Ar Age and Whole-rock Chemical Composition of Volcanic Rock from the Matsu Seamount in the Eastern Marginal Section of the Sea of Japan off Akita Prefecture
Get PDFWe confirmed the K-Ar age and whole-rock major and trace element compositions of a volcanic rock sample from the Matsu Seamount, located in the northeastern marginal section of the Yamato Basin in the Sea of Japan. K-Ar analyses of the groundmass fraction and separated plagioclase suggest that the seamount was formed about 10Ma. The sample from the seamount is orthopyroxene-clinopyroxene trachyandesite with 58wt.% SiO2. It differs from trachyandesites from Quaternary volcanoes in the Northeast Honshu arc in terms of lower Rb and Ba, and higher Nb contents. The Zr/Nb ratio of the trachyandesite suggests an ocean island basalts (OIB) affinity. On the other hand, higher Rb/Nb and K/Nb ratios than those seen in OIB are indicative of the presence of subduction-derived components in its magma.departmental bulletin pape
