<国立科博専報>東北日本北部陸域における新第三紀火山活動 : その2.津軽半島北部沿岸の新第三紀火山類の産状

概要

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Modes of occurrence of the Miocene volcanic rocks in the northern part of the Tsugaru Peninsula are described and discussed in relation to the paleogeographic change of this area. This area has been suffered from sharp topographic transition; subsidence to uplift after the opening of the Japan Sea. The volcanic products older than 7Ma are submarine lava flows (Fuyube Formation, Tappi Andesite, Mimmaya Ryholite and Horozuki Volcanic Rock), while younger (7-5Ma) volcanic products are characterized by pyroclastic deposits including water-chilled bombs. Such a change of volcanic facies from submarine to terrestrial is corresponding to the paleogeographic change from subsidence to uplift in this area during late Miocene.
国立科学博物館の論文
1987-12-01