Vanadiferous minerals from the Nereus Deep, Red Sea |
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| Authors: | Jacques Jedwab Gérard Blanc Jacques Boulegue |
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| Institution: | Laboratoire de Géochimie, CP 260, UniversitéLihre de Bruxellcs, 50, Au. Roosevelt, 8–1050 Brussels, Belgium;Laboratoire de Géochimie et Métallogénie, CNRS, UA 196, UniversitéPierre &Marie Curie, 4, Place Jussieu F-75230, Paris CEDEX 05, France;Laboratoire de Géochimie et Métallogénie, CNRS, UA 196, UniversitiéPierre 6 Marie Curie, 4, Place Jussie F-75230, Paris CEDEX 05, France |
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| Abstract: | The chemical analysis by EMPEDS of 140 samples in cores from six Red Sea troughs and basins has led to the discovery in the Nereus Deep of high vanadium concentrations (up to 1.3% V2O3) in several bulk samples, and to the isolation of a major magnetite phase. This vanado-magnetite, remarkable for its high content of vanadium (mean = 1.45% V2O3) and its lack of titanium, is frequently zoned, the V-content decreasing toward the outer zones. Oxides with up to 42% V2O3, have also been found. Since the origin of the magnetite is clearly authigenic, its high vanadium and low titanium concentrations are traced back to the differential hydrothermal leaching of Fe—Ti-oxides which occur profusely in basic eruptive rock clasts, actually present in some of the overlying seams. |
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