Abstract The track of South Atlantic hotspots on oceanic crust is well known. However, the
possible hotspot trails of Tristan-Gough (TG) and St. Helena (SH) plume heads on …

For over 50 years, Mesozoic tholeiites, kimberlites and carbonatites from the South
American platform have been enabled the understanding of melting processes in the Earth's …

This paper reviews general aspects of alkaline-carbonatitic rocks of Brazilian, Paraguayan
and Bolivian terrains. Although 30 such occurrences are known in literature, only the major …

Abstract 40 Ar/39 Ar laser incremental-heating geochronology of whole-rock fragments and
minerals from primitive subalkaline mafic dykes from the Cabo Frio Tectonic Domain …

General information is presented on ten agpaitic occurrences located in southern Brazil and
at the border between Brazil and Paraguay. All the Brazilian agpaitic rocks are Late …

Local phase filters as the tilt derivative (TDR) and the horizontal tilt derivative (TDX) are
extensively used to interpret magnetic data. We use two combinations of these filters …

We report here the finding and analysis of xenoliths of altered basalt clasts dredged from the
top of two exhumed diapirs in the southern Santos Basin (SW Atlantic). The diapirs crossed …

We present a study of the brittle tectonics of Tunas Alkaline Complex focusing on the
kinematic and geometric analysis of faults and brittle shear zones deforming the complex …

Porphyritic alkaline dykes from the Serra do Mar province (SE Brazil) carry clinopyroxene
macrocrysts with a complex magmatic history. Clinopyroxene is the main macrocryst phase …

The laser ablation sector field inductively coupled plasma mass spectrometry (LA–SF–ICP-
MS) U–Pb geochronological method is frequently used to date minerals, in particular zircon …