Geology and volcanism of the underwater Vityaz Ridge (Pacific slope of the Kuril Island Arc) |
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| Authors: | Email author" target="_blank">E?P?LelikovEmail author T?A?Emelyanova |
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| Institution: | 1.Il’ichev Pacific Oceanological Institute, Far East Branch,Russian Academy of Sciences,Vladivostok,Russia |
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| Abstract: | This paper presents the results of geological studies carried out during the two marine expeditions of the R/V Akademik M.A. Lavrent’ev (cruises 37 and 41) in 2005 and 2006 at the underwater Vityaz Ridge. Dredging has yielded various rocks from the basement
and sedimentary cover of the ridge within the limits of three polygons. On the basis of the radioisotope age determinations,
petrochemical, and paleontological data, all the rocks have been subdivided into the following complexes: the volcanic ones
include the Paleocene, Eocene, Late Oligocene, Middle Miocene, and Pliocene-Pleistocene; the volcanogenic-sedimentary ones
include the Late Cretaceous-Early Paleocene, Paleogene undifferentiated, Oligocene-Early Miocene, and Pliocene-Pleistocene.
The determination of the age and chemical composition of the rocks has enabled us to specify the formation conditions of the
extracted complexes and to trace the geological evolution of the Vityaz Ridge. The presence of young Pliocene-Pleistocene
volcanites allows one to come to a conclusion about the modern tectono-magmatic activity of the central part of the Pacific
slope of the Kuril Islands. |
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