Geoscience reports of Shimane University

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Geoscience reports of Shimane University 15
1996-12-25 発行


Oligocene Sakurae Group in the northwestern area of Sakurae Town,Shimane Prefecture
Nakazawa, Koichi
Komuro, Hiroaki
The Oligocene Sakurae Group consists of basalt lavas,dacitic pyroclastic rocks,dacitic welded tuffs and andesite lavas, in ascending order. This group is probably in fault contact with the basement Sangun metamorphic rocks,and forms a gentle half basin and not ar esurgent dome. Some dikes and plutons are emplaced along the faults. These structural characters suggest the formation of a cauldron closely related with the volcanic activity producing the Sakurae Group. NNW-SSE Strike slip faults cut the Sakurae Group after the formation of the cauldron.13;