Sintetizam-se conhecimentos modernos sobre as ilhas e arquipélagos oceânicos
brasileiros, cuja origem e localização geográfica sofreu decisiva influência de estruturas da …

Highly alkaline silica undersaturated lavas erupted at Trindade Island over its 5 Ma geologic
history and comprise primitive nephelinites-basanites and more evolved nepheline-bearing …

The oceanic basins are dotted by seamounts, guyots and islands formed by the mantle
plumes and oceanic lithosphere interaction. These plumes are responsible for several …

A stratigraphic framework can be constructed through lithofacies description and
interpretation. The application of this method in volcanic systems is a fundamental tool for …

Martin Vaz Island is one of the oceanic islands of the homonym archipelago linked to the
Vitoria-Trindade volcanic seamount ridge, an important South Atlantic physiographic feature …

Abstract The volcanic Martin Vaz Archipelago consists of four Plio-Pleistocene small islands
(total area of 0.37 km 2) in the South Atlantic Ocean in front of Brazil's coast. Together with …

Anisotropy of magnetic susceptibility (AMS) and anhysteretic remanent magnetization
(AARM) are tools to characterize flow structures and emplacement conditions of volcanic …

This paper presents the first results of 238U–230Th–226Ra and 232Th–228Ra–228Th
radioactive disequilibria of alkaline volcanic rocks from Trindade and Martin Vaz islands …

A detailed radiochemical procedure for alpha spectrometry measurements of uranium
concentrations and of 234U/238U activity ratios in silicates is presented. The described …

Two segments of subduction of the Nazca plate beneath the South American plate occur at
low angles based on seismic hypocenter locations, approaching nearly horizontal below …