Be Isotope Studies on the Contribution of Subducted Oceanic Sediments to Arc Magma The North-East Japan and Hokkaido Areas

Akiko SHIMAOKA; Ichiro KANEOKA

doi:10.5026/jgeography.109.4_627

Be Isotope Studies on the Contribution of Subducted Oceanic Sediments to Arc Magma

The North-East Japan and Hokkaido Areas

Akiko SHIMAOKA, Ichiro KANEOKA

Author information

Keywords: Be isotope, North-East Japan arc, volcanic rock, subduction zone, oceanic sediment

JOURNAL FREE ACCESS

2000 Volume 109 Issue 4 Pages 627-635

DOI https://doi.org/10.5026/jgeography.109.4_627

Details

Abstract

Cosmogenic ¹⁰Be (t_1/2=1.5×10⁶ 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.

Corresponding author

Register with J-STAGE for free!