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Bauxitization of alkaline rocks in southern Brazil
1983Melfi A., Carvalho A. Bauxitization of alkaline rocks in southern Brazil. In: Pétrologie des altérations et des sols. Vol. III : Pédologie. Pétrologie appliquée aux substances utiles. Colloque international du CNRS, Paris 4-7 juillet 1983. Strasbourg : Institut de Géologie – Université Louis-Pasteur, 1983. pp. 161-172. (Sciences Géologiques.
Melfi, Adolpho J., Carvalho, A.
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The alkaline rocks of Port Cygnet, Tasmania
1984The Port Cygnet alkaline complex consists of small scattered concordant and discordant intrusions of Cretaceous age emplaced in Jurassic dolerite and Permian fluvioglacial sediments in the vicinity of Port Cygnet, southern Tasmania. The alkaline rocks are miaskitic and fall into two main groups: one is a group of slightly oversaturated syenites with a ...
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Do carbonatites and alkaline rocks reflect variable redox conditions in their upper mantle source?
Earth and Planetary Science Letters, 2020S Braunger +2 more
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Prospection for Niobium-Rich Alkaline Rocks
1989Nb belongs to the fifth group of the periodic table of the elements. Its atomic number is 41, its atomic weight is 92.9046 and its electronegativity is 1.6. In a six-fold coordination its ionic radius is 0.64, 0.68 and 0.62 A for the valencies of 5, 4 and 3 respectively.
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Agpaitic Alkaline Rocks in Southern Brazilian Platform: A Review
Minerals (Basel, Switzerland), 2021Celso de Barros Gomes +2 more
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