Activités par an
Résumé
The iron mine of Tamra (Nefza District, NW Tunisia) is located within the approximately 50 m thick Zanclean sedimentary series. This sequence contains Fe-Mn oxide impregnation associated with halloysitekaolinite occurrences. Fluid evaporation during weathering and pedogenesis, and/or mixing of surface water and regional hydrothermal fluids are considered to be related to the concentration of iron in those sediments. The stable isotope geochemistry of oxygen and hydrogen of goethite-hematite, and halloysite-kaolinite, was examined in order to provide new insights to the ore formation. The main outcomes of this study indicate that halloysite-kaolinite and goethite did not equilibrate with the same fluid during supergene conditions. In a δD and δ18O diagram, kaolinite from the Tamra deposit plots to the right side of the kaolinite line, which would correspond to unlikely formation temperatures of below 0°C. δD and δ18O values of goethite allow for the same conclusion. The origin of these unusual compositions could be due to two main factors: 1) the arid Zanclean climate with mineral formation from evaporative brines and/or 2) fluid-mineral fractionations with relatively high δ18O hydrothermal fluids.
langue originale | Anglais |
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titre | δD and δ18O Values of Halloysite-Kaolinite and Goethite-Hematite in the Fe deposit of Tamra (NW Tunisia): New insights for mixing fluids during ore formation |
Lieu de publication | Nancy |
Pages | 51 |
Nombre de pages | 54 |
Volume | 2 |
Edition | SGA |
Etat de la publication | Publié - 24 août 2015 |
Evénement | 13th SGA Biennial Meeting - Palais des Congrès, Nancy, France Durée: 24 juil. 2015 → 27 août 2015 |
Une conférence
Une conférence | 13th SGA Biennial Meeting |
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Pays | France |
La ville | Nancy |
période | 24/07/15 → 27/08/15 |
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Équipement
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Microscope électronique à balayage
Charles Nicaise (!!Manager) & Francesca Cecchet (!!Manager)
Plateforme technologique Morphologie, imagerieEquipement/installations: Equipement
Activités
- 1 Participation à un Colloque, une journée d'étude
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13th SGA Biennial Meeting
Augustin Dekoninck (Poster)
24 août 2015 → 27 août 2015Activité: Types de Participation ou d'organisation d'un événement › Participation à un Colloque, une journée d'étude