Progress of the study of the sea-floor spreading.

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  • 海底拡大研究の現状
  • カイテイ カクダイ ケンキュウ ノ ゲンジョウ

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The progress of the study of the sea-floor spreading has mutual relationship with that of the ophiolite. The scientists to study ophiolites should fully understand the present progress of the study of the sea-floor spreading, and vice versa. We obtained the concept of the sea-floor spreading in 1960's in terms of diverging plate boundaries and started to observe geological process at the spreading axis in 1970's. Swarth mapping of topography by multi narrow beam sonar and long range sidescan sonar, manned submersible observation, multichannel seismic reflection survey of the spreading axis, and detailed geochemical study of sampled rocks dramatically improved our understanding of the geological process along the spreading axis in early 1980's. The trend of the study of the sea-floor spreading is shifting toward the global understanding of its dynamic process in late 1980's.

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