Modelling of an MVT deposit: Touissit-Bou Beker district (eastern Morocco)

The Touissit-Bou Beker district mineralization is located in a lower Jurass ic condensed series on top of a major basement horst. Field and laboratory data from several ore deposits indicate that Pb-Zn mineralization took plac e in dolomite strata by ascending hot, saline fluids probably during the La te Jurassic. The geochemistry of the ore fluid and the mineralization have been tentatively modelled with "Geochemist's Workbench(TM)". Two-dimensional (2D)-modelling of fluid flow at the regional scale has been undertaken, after reconstitution of regional structure, using a code of co upled heat and fluid transport (METIS), in order to give an image of hydrot hermal circulations at the time of ore deposition. The horst structure caus es convective circulation driving sedimentary fluids down through Triassic saline beds and up through basement rocks into the top of the horst. (C) 20 00 Elsevier Science B.V. All rights reserved.