下関亜層群と香春花崗閃緑岩(若松岩体)のK-Ar年代 K-Ar ages of the Early Cretaceous Shimonoseki Subgroup and the Kawara Granodiorite, Southwest Japan
K-Ar ages were determined for hornblende in andesite lava from the Shimonoseki Subgroup of the Kanmon Group and for hornblende and biotite from the Kawara Granodiorite of the north Kyushu granitic rocks. The Shimonoseki Subgroup gave late Early Cretaceous age of 103 Ma. The Kawara Granodiorite gave latest Early Cretaceous ages of 96.9 Ma (hornblende) and 98.6 Ma (biotite).
- 岩鉱 : 岩石鉱物鉱床学会誌 : journal of mineralogy, petrology and economic geology
岩鉱 : 岩石鉱物鉱床学会誌 : journal of mineralogy, petrology and economic geology 93(8), 307-312, 1998-08-05
Japan Association of Mineralogical Sciences