VOLCANIC-SEDIMENTARY DEPOSITS IN THE TYRRHENIAN ABYSSAL BASIN
Investigations in the vicinity of the Vercelli, Magnaghi, Vavilov, and Marsili volcanic seamounts reveal a complex sequence of volcanic de-posits interbedded with sedimentary layers. Seismic profiling allows the volcanic formations to be traced from the volcanoes into the abyssal zone. The volcanic-sedimentary complex, with an average thickness of 1.5-2 km, is ubiquitous in the deep basin. It lies on crystalline basement and is overlain by Pliocene-Quaternary sediments.