Integrated geologic-geophysical investrigation of the Archangelsky submarine volcanic massif (Kurile island arc)

Abstract

The article presents the results of integrated geologic-geophysical investigation of the Arkhangelsky submarine volcanic massif, which is located in the Bussol Strait in the central zone of the Kurile Island Arc. The massif consists of amalgamated and eroded volcanic edifices and is built up of endogenous basalts and exogenous tuffs. Rocks and minerals to the exclusion of quartz are hydrothermally altered; moreover they were altered after the formation of tuff. High values of the natural remnant magnetization of dredged rocks are caused by the high content of single-domain and pseudo-single-domain grains of titanomagnetite and magnetite. The Arkhangelsky massif most likely was formed during periods of global geomagnetic disturbances. The authors have revealed feeders of the near-vertical and southeastern trends and causative magnetic blocks with different geometric and magnetic characteristics in the edifice of the massif. A peripheral magma chamber has been revealed between depths of 1100–1200 m. At the southeast foot of the massif we found large landslide blocks.

Keywords

• archangelsky submarine volcanic massif
• kurile island arc