Activities per year
Abstract
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.
Original language | English |
---|---|
Title of host publication | 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 |
Place of Publication | Nancy |
Pages | 51 |
Number of pages | 54 |
Volume | 2 |
Edition | SGA |
Publication status | Published - 24 Aug 2015 |
Event | 13th SGA Biennial Meeting - Palais des Congrès, Nancy, France Duration: 24 Jul 2015 → 27 Aug 2015 |
Conference
Conference | 13th SGA Biennial Meeting |
---|---|
Country | France |
City | Nancy |
Period | 24/07/15 → 27/08/15 |
Fingerprint Dive into the research topics of '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'. Together they form a unique fingerprint.
Equipment
-
Scanning electron microscope
Charles Nicaise (Manager) & Francesca Cecchet (Manager)
Technological Platform Morphology - ImagingFacility/equipment: Equipment
Activities
- 1 Participation to a Symposium, a study Day
-
13th SGA Biennial Meeting
Augustin Dekoninck (Poster)
24 Aug 2015 → 27 Aug 2015Activity: Participating in or organising an event types › Participation to a Symposium, a study Day