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Extrusive carbonatite ash tuff (Tantum) and spatter (Monte Miranda) deposits, and topsoils (incipient and shallow) from both sites of Brava Island (Cape Verde archipelago) were studied by neutron activation analysis, X-ray diffraction and Mössbauer spectroscopy. The ash tuff deposit near Tantum, here reported for the first time, corresponds to an extrusive calciocarbonatite with high W, Th, U and...
Iron contents, its compounds and forms in topsoils of the volcanic Fogo island (Cape Verde) were studied by neutron activation analysis, Mössbauer spectroscopy and X-ray diffraction. The topsoils were collected from all units of the island in diverse geological formations — carbonatite, nephelinites, limburgite, pyroclasts, deposits, pre-historic lavas and historic lavas. Fine materials from Mota...
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