Abstract
The application of new methods for the extraction of radiolarians from dense cherts, jaspers and tuffs in fold belts of the Far East USSR enables us to revise the lowest age limit of volcanogenic-siliceous rocks along the NW Pacific Rim from Late Jurassic to Early or Late Permian. The discovery of new radiolarian localities in the Koryak Upland, Kamchatka allows determination of the age of siliceous rocks in several ophiolite belts and provides indications of paleolatitude in some terranes. Radiolarians have been extracted to aid in terrane analysis as well as geological-tectonic mapping and palinspastic reconstructions. High diversity Middle Cretaceous radiolarian assemblages from some allochthons of North Kamchatka resemble those from Site 466 of Leg 62 and Site 585 of Leg 89 in the Pacific Ocean as well as some from low latitude Cuban sections. This may be considered as evidence for the large scale lateral tectonic dislocations of these blocks since the Aptian-early Albian.
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