par Jedwab, Jacques 
;Blanc, Gérard;Boulégue, Jacques
Référence TERRA nova, 1, 2, page (188-194)
Publication Publié, 1989-03
;Blanc, Gérard;Boulégue, JacquesRéférence TERRA nova, 1, 2, page (188-194)
Publication Publié, 1989-03
Article révisé par les pairs
| Résumé : | The chemical analysis by EMP/EDS 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. -Authors |
