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K-Ar dating on volcanic rocks in the Bonin Islands and its tectonic implication

Authors
Journal
Tectonophysics
0040-1951
Publisher
Elsevier
Publication Date
Volume
95
Identifiers
DOI: 10.1016/0040-1951(83)90069-0
Disciplines
  • Archaeology

Abstract

Abstract The K-Ar dating method was applied to the volcanic rocks, the boninite and related rocks, from the Bonin Islands. Four fresh samples gave K-Ar ages of about 40 Ma. These ages suggest that the main volcanism of the Bonin Islands occurred about 40 Ma ago, as a result of the initiation of subduction of the Pacific plate at its western margin. Results of the K-Ar dating on other rocks suggest that some volcanism or thermal disturbance may have occurred 5 ~ 10 Ma ago, at least, in Chichijima.

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