Biotite rhyolites of Jyodo-ga-hama, Iwate Prefecture @Kitakami Mountains of NE Japan are well known sedimentary terrain intruded by the early Cretaceous (}110 Ma) plutonic rocks which include K-alkalic to adakitic variety. Besides, Paleogene adakitic felsic rocks intrude them in small scale as laccolith, dike and plugs. The picture was taken at the laccolithic body of biotite rhyolites (50 Ma) occuring along the Pacific coast of Miyako city, called Jyodo-ga-hama, implying gBeech of the Pure Landh. |