Application of Tephrochronology in the Kurile-Kamchatka and Aleutean Marginal Sea-Island Arc Systems (KALMAR-Project)

• Main Authors: van den Bogaard, Christel, Portnyagin, Maxim, Ponomareva, V., Derkachev, A., Dirksen, O., Diekmann, B., Tiedemann, Ralf, Nürnberg, Dirk
• Format: Conference Object
• Language: unknown
• Published: 2011
• Subjects: Bering Sea; Kamchatka Peninsula; Pacific; Sokoch; Kamchatka
• Online Access: https://oceanrep.geomar.de/id/eprint/13378/; http://www.inqua2011.ch/?a=programme&subnavi=abstract&id=3422

KALMAR aims at investigating the geosystem „Kurile-Kamchatka-Aleutean Arc“ and its interaction with the climate system onshore Kamchatka and offshore in the NW Pacific and the Bering Sea. The complex system is controlled by the most active volcanoes on earth and allows the study of the flux rates of material from mantle to atmosphere as well as the interaction of the asthenosphere, hydrosphere and the atmosphere. Environmental changes during the Pleistocene to Holocene are inferred from both marine and lake sediment cores that give insight into climate-driven changes in palaeoceanography as well as ecological and limnological changes in the terrestrial realm, respectively. Marine sediment cores were taken from the NW-Pacific and the Bering Sea during cruise SO201 of research vessel 'SONNE' in 2009, while lake records were obtained from Two-Yurts Lake and Lake Sokoch on Kamchatka peninsula in summer 2007. Various tephra layers were identified in the sediment cores. To enable a long distance correlation of individual tephra layers a reliable fingerprinting of the volcanic ash was aimed at by EMP and LA-ICP-MS glass analyses. In the poster aspects of this study are shown as well as implications of the correlations that link various geological records. The study will permit the comparison of paleoclimatic, paleoceanological and volcanological records. The study contributes to understand the volcanic and magmatic evolution of the Kamchatka-Aleutian Triple Junction.