Be同位体比から見た島弧マグマへの海洋性堆積物の寄与-北海道・東北日本弧火山を例として- Be Isotope Studies on the Contribution of Subducted Oceanic Sediments to Arc Magma:The North-East Japan and Hokkaido Areas
Cosmogenic <SUP>10</SUP>Be (t<SUB>1/2</SUB>=1.5×10<SUP>6</SUP> years) has been revealed to be a quite useful tracer forsediment recycling at convergent margins. This study focuses on Be isotopic ratios of lavasfrom the North-East Japan including the Hokkaido area, which have been regarded as typicalsubducted areas. The results indicate the incorporation of oceanic sediments into the arcmagma. Regional Be isotopic variations in time and space have also been observed, suggestingthe possible occurrence of a more complicated process for Be isotopic ratios than previously considered.
地學雜誌 109(4), 627-635, 2000-08-25
Tokyo Geographical Society