|Seminar and Symposium at KURCPI
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- Research Seminar No.177, 17 April 2017
16:30-, The Interdivisional Education and Research Building, 5th Floor
「Another Story on the Opening of the Japan Sea and the Birth of the Japan Islands」
KANO Kazuhiko (National Institute of Advanced Industrial Science and Technology)
The main part of the Japan Islands is a volcanic arc that has separated
from the continent and migrated to its present position and the Japan Sea
is a depression formed behind the volcanic arc along with the process.
It was soon after Alfred Wegener published his idea on the continental
drift in 1915 that Torahiko Terada and others advocated this idea. Their
primitive thought had remained minor for a long time under the prevalence
of the geosyncline orogeny theory but became widely accepted in 1980’s
when a tectonic model including clockwise rotation of SW Japan and counter-clockwise
rotation of NE Japan was proposed in support with the temporal changes
of the rock magnetization vectors examined at various places in Japan.
However, the timing of the movement and the details of the geologic processes
are still controversial. This is because it was difficult to accurately
date and read the geological processes that might have been recorded in
the Green Tuff successions. Recent research results obtained with application
of volcanic facies analysis and reliable dating methods give a new perspective on the opening of the
Japan Sea and the birth of the Japan Islands.
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