VOLCANIC COMPLEXES AND TECTON-MAGMATIC STAGES OF THE EVOLUTION OF THE MAGELLAN SEAMOUNTS (PACIFIC OCEAN). MESSAGE 1: VOLCANIC COMPLEXES

The paper presents original and published data of radioisotope dating volcanic rocks the Magellan Seamounts. These available geological materials allow us to distinguish five major complexes different ages in guyots Seamounts: 1 — Late Jurassic-Early Cretaceous (earliest Cretaceous); 2 Early (Apt-Albian); 3 (Late Cenomanian-Turonian- Campanian); 4 Campanian-Maastrichian); 5 Cenozoic. Each these age corresponds a specific tectonic-magmatic stage evolution Seamounts characterizes geomorphological space (pedestal, main body, small complicating superimposed structures second order). This division is based on numerous isotopic determinations for 11 obtained by K-Ar Ar-Ar methods. evolutionary stages correspond, general, periods tectonic activation other Pacific Ocean bed.