K-Ar ages of hornblendes in andesite and dacite from the Cretaceous Kanmon Group, Southwest Japan
K-Ar ages of hornblendes in andesite and dacite from the Cretaceous Kanmon Group, Southwest Japan
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日本西南部白垩纪关门群安山岩和英安岩中角闪石的 K-Ar 年龄
DOI：
10.2465/ganko.88.265
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
T. Itaya
中科院分区：
文献类型：
--
作者：
T. Imaoka;Tsukasa Nakajima;T. Itaya
本文给出了关门群上半部下关亚群火山岩中角闪石的新K-Ar年龄。安山岩和英安岩的年龄分别为105.2± 3.3Ma和106.7± 3.3Ma。这些数据表明早白垩世晚期阿尔布期的岩浆活动，并支持柴田田等人（1978）根据地层学和古地磁学证据所作的年龄估计。
New K-Ar ages of hornblende in volcanic rocks from the type localities of the Shimonoseki Subgroup, upper half of the Kanmon Group are presented. The obtained ages are 105.2±3.3 Ma for andesite and 106.7±3.3 Ma for dacite. These data indicate igneous activity during Albian, late Early Cretaceous and support the age estimation by Shibata et al. (1978) based on stratigraphic and paleomagnetic evidences.