Genesis of celestite - bearing cap rock formation from the Ain Allega ore deposit (northern Tunisia): contributions from microthermometric studies - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Bulletin de la Société Géologique de France Année : 2011

Genesis of celestite - bearing cap rock formation from the Ain Allega ore deposit (northern Tunisia): contributions from microthermometric studies

Résumé

The Ain Allega ore deposit represents one of the most significant Pb-Zn Sr-Ba deposits of the flysch zone in northern Tunisia. The total quantity of sulphide produced is 22,700 metric tons, with 13,300 t of galena and 9,400 t of sphalerite. It is located on the eastern edge of the Triassic diapir of the Jebel Hamra. The main ore minerals include sphalerite, galena, pyrite and marcasite, and gangue minerals including dolomite, calcite, celestite, quartz and barite. The mineralization hosted by carbonate rocks, shows some evidence of dissolution and brecciation characteristic of cap-rock formation. The fluid inclusion study from the celestite suggests that the primary and secondary monophase liquid (L) inclusions are most abundant compared to the other types. The microthermometric analyses of two-phase primary inclusions display homogenization temperatures ranging from 136 to 208°C (average of 180°C) and salinities ranging from 11.34 to 24.38 equivalent weight % NaCl (average of 16.4). The calculated density, pressure and depth are 0.965 g/cm3, 18 bars and 80 m, respectively. The hydrothermal fluid resulted from mixing of basinal brines and magmatic-meteoric solutions. Geological, mineralogical and thermometric data indicate that the Ain Allega ore deposit results of a mixing of basinal fluids (Mississippi valley type deposit) and hydrothermal fluids related to a shallow intrusion.
Fichier non déposé

Dates et versions

halsde-00653276 , version 1 (19-12-2011)

Identifiants

  • HAL Id : halsde-00653276 , version 1

Citer

Riadh Abidi, Najet Slim-Shimi, Dominique Gasquet, Nouri Hatira, Alireza Somarin. Genesis of celestite - bearing cap rock formation from the Ain Allega ore deposit (northern Tunisia): contributions from microthermometric studies. Bulletin de la Société Géologique de France, 2011, 182 (5), p. 427-435. ⟨halsde-00653276⟩
196 Consultations
0 Téléchargements

Partager

Gmail Facebook X LinkedIn More