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Two different temporal patterns of explosive volcanism are represented in the reference stratigraphic sections of Sites 438 and 436, located, respectively, landward and seaward of the Japan Trench. The landward reference site shows two distinct maxima of the volcanic ash layers at approximately 16-15 Ma and 5-2 Ma, a pattern common in the Tohoku Arc. The older maximum corresponds to the acidic volcanic activity in the Daijima and Nishikurosawa stages (16-15 Ma), which may be related to the formation of the Kuroko deposits. The younger maximum corresponds to the Funakawa and Kitaura stages (5-2 Ma), a time of prolific acidic volcanic activity and also of the intrusion of the so-called Tertiary granites related to the Dewa disturbance. At the seaward reference site, the apparent frequency increase of the volcanic ash layers from 11 Ma toward the Recent was governed by the movement of the Pacific Plate with time, particularly the gradual approach of the site toward the volcanic source area, the Japanese Islands.

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Synthesis of Neogene Explosive Volcanism of the Tohoku Arc, Deduced from the Marine Tephra Drilled around the Japan Trench Region, Deep Sea Drilling Project Legs 56, 57, and 87B