Chronology of Eruptions, Composition, and Magmatic Evolution of the Paektusan Volcano: Evidence from K-Ar, ~(87)Sr/~(86)Sr, and δ~(18)O Isotope Data

摘要

Late Miocene to Pliocene basaltic plateaus, valley lava flows, and monogenic volcanoes are abundant in the Russian Far East. Neovolcanic activity is extremely limited and mainly restricted to the southern Far East, e.g., the Wudalianchi, Erkeshan, and Jinbohu volcanoes (northeastern China) and volcanoes of the Tokin Stano-vik (northern Amur area, Russia). Some of these volcanoes erupted in the 18th century. The eruptive products are mainly composed of alkali basalts (basanite, leucite basanite, leucitite, and others) spread over a small area. The study region is considered inactive in terms of volcanism, and recent eruptions are thought to be nonhaz-ardous. As was indicated by geological studies in the 20th century, Paektusan (Baitoushan) Volcano erupted in historical time.