Composition and formation settings of the siliceous-volcanogenic complexes of the Nizhneussuriisk segment,Kiselevka-Manoma terrane,West Sikhote Alin |
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Authors: | A N Filippov G I Govorov A A Chashchin T A Punina |
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Institution: | 1.Far East Geological Institute, Far East Branch,Russian Academy of Sciences,Vladivostok,Russia |
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Abstract: | This paper reports new data on the mineralogical-petrographical composition, genetic types of sedimentary rocks, and geochemical
features of the volcanic rocks of the Snarsky area of the Nizhneussuriisk segment of the Kiselevka-Manoma accretionary complex,
which is developed on the right bank of the lower reaches of the Ussuri River. The Middle Jurassic-Aptian sedimentary rocks
of the area are represented by pelagic radiolarian cherts, semipelagic siliceous-clayey deposits, subordinate shallow limestones,
volcanomictic conglomerates, and turbidite sandstones. The basalts of the area are represented by alkaline basalts resembling
within-plate ocean-island basalts and N-MORB-type tholeiitic basalts. Rock associations of two physicogeographical and geodynamic
settings are distinguished: the pelagic setting with within-plate alkaline volcanic rocks and the hemipelagic one with volcanic
edifices of spreading basalts. |
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