K-Ar dating on volcanic rocks in the Bonin Islands and its tectonic implication
K-Ar dating on volcanic rocks in the Bonin Islands and its tectonic implication
复制标题
小笠原群岛火山岩 K-Ar 定年及其构造意义
DOI：
10.1016/0040-1951(83)90069-0
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发表时间：
1983
期刊：
影响因子：
2.9
通讯作者：
H. Tsunakawa
中科院分区：
文献类型：
--
作者：
H. Tsunakawa
对小笠原群岛火山岩-玻安岩及有关岩石进行了K-Ar定年。4个新鲜样品的K-Ar年龄约为40 Ma。这些年龄表明，小笠原群岛的主要火山活动发生在大约40 Ma前，是太平洋板块在其西缘开始俯冲的结果。其他岩石的K-Ar年龄测定结果表明，至少在5 ~ 10 Ma前，七岛地区可能发生过火山活动或热扰动。
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.