Details

Autor(en) / Beteiligte

• Martynov, Yu. A.
• Rybin, A. V.
• Degterev, A. V.
• Ostapenko, D. S.
• Martynov, A. Yu

Titel

Geochemical evolution of volcanism of Matua Island in the Central Kurils

Ist Teil von

• Russian journal of Pacific geology, 2015, Vol.9 (1), p.11-21

Ort / Verlag

Moscow: Pleiades Publishing

Erscheinungsjahr

2015

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The first comprehensive isotope-geochemical study of volcanogenic rocks of different ages from Matua Island made it possible to distinguish the general stages in the magmatic evolution of the subduction system. The petrological similarity of the rocks from the central and northern chains of the Kuril island arc testifies that they were formed above “hot” geochemically enriched but isotopically depleted lithospheric mantle. The compositional change of the volcanic rocks of Matua Island in the Pleistocene-Holocene suggests a geodynamic transition at that time. Taking into account the similar tendency previously established in the southern Kuril Range (Kunashir Island) and for the Mutnovsky and Gorelyi volcanoes of southern Kamchatka, a global Pleistocene-Holocene tectonic event may be proposed in the evolution of the Kuril-Kamchatka island arc. The finding of the “adakite-like” tephra on Matua Island indicates the presence of felsic adakite-like melts among the eruption products of Sarychev Peak Volcano.