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Bulletin de la Societe Geologique de France; November 2007; v. 178; no. 6; p. 459-471; DOI: 10.2113/gssgfbull.178.6.459
© 2007 Societe Geologique de France
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Fluid inclusion microthermometry and rare earth element distribution in the celestites of the Jebel Doghra ore deposit (Dome Zone, northern Tunisia): towards a new genetic model

Fouad Souissi1, Radhia Sassi2, Jean-Louis Dandurand3, Salah Bouhlel1 and Sami Ben Hamda1

1 Laboratoire RME, Faculté des Sciences, Univ. Tunis El Manar, 1060 Tunis, Tunisie. souissi_foued{at}yahoo.fr
2 Institut National de Recherche et d’Analyse Physico-chimique, Sidi Thabet, 2020 Ariana, Tunisie. souissiradhia{at}yahoo.fr
3 Laboratoire MTG, 14 Avenue E. Belin, 31400 Toulouse cedex, France. E-mail: jld{at}lmtg.obs-mip.fr

The celestite ore of Jebel Doghra occurs as stratabound deposits within the cap-rock of a diapiric structure of Triassic salt-rocks. The celestite deposits result mainly from the late diagenetic to epigenetic replacement of the carbonated host-rocks giving rise to a dolomite-celestite "banded ore". Celestite is locally observed within fractures. This study proposes a new genetic model based on fluid inclusion (FI) microthermometry and REE geochemistry. FI show that celestite, occurring either as stratabound bodies or lodes, was deposited from a highly saline (20.7 ± 1.3 wt%NaCl equivalents) and warm (174 ± 3oC) basinal fluid, which contains hydrocarbon droplets and CO2. The geochemistry of the REE shows that the deposition of celestite is due to the mixing between a deep-sourced fluid which has acquired high Sr concentrations by leaching feldspar-rich series in depth and a sulfate-rich solution associated with the Triassic evaporites.

Key Words: Triassic-Cretaceous transition zone • Celestite ore deposit • Salt dome • Cap-rock • Fluid inclusions (FI) • Rare earth elements (REE) • Doghra • Northern Tunisia






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