島根県およびその周辺地域の新第三紀中性〜塩基性貫入岩類にみられる岩石化学的地域性について

概要

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Many intrusive bcdies intruded into the Miocene formation, are known in the green tuff region of Shimane prefecture and its adjacent areas, the coast of the Sea of Japan. From petrochemical point of view, these rocks are classified into the following three types: tholeiitic, high-alumina and alkali basalt magma type. The frst type occurs in the Oda Miocene sedimentary basin underlain by Sangun metamorphic rocks. The second one occurs in the Izumo Miocene sedimentary basin and the eastern part of Shimane peninsula district. Both districts are Miocene sedimentary basin underlain by Paleogene granite batholith. The last one occurs in the western part of Shimane peninsula district. The basement rocks of the Miocene sediments in this district are composed of rocks which belong to the Hida-Oki metamorphic belt Accordingly, the cause of regionality on the petrochemical nature of these intrusive rocks is related with difference of these basement rocks.
日本地質学会の論文
1973-07-01