Water-rock interaction on Zabargad Island, Red Sea--A case study: I. Application of the concept of local equilibrium

Details Water-rock interaction on Zabargad Island, Red Sea--A case study: I. Application of the concept of local equilibrium Water-rock interaction on Zabargad Island, Red Sea--A case study: I. Application of the concept of local equilibrium

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.2187s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 59, Issue 11, pp.2187-2206

Computer Science

3

Scientific paper

Zabargad Island is an uplifted fragment of Red Sea lithosphere. The main lithospheerc unit of the island is constituted by exceptionally fresh peridotite. Fractured portions of the peridotite bodies, however, locally underwent complex water-rock interactions. We apply a nonlinear minimization routine to study this complex event in the framework of the postulate of local equilibrium in disequilibrium processes (Prigogine, 1955). Such a study allows a rough estimate of the chemistry of interacting fluids (and of P , T conditions at equilibrium). The process took place at an average pressure of 1 kbar and, after an initial hydration stage, a thermal maximum was reached at about 500°C, corresponding to the zone of retrograde formation of olivine gems, after which the temperature progressively fell to about 200°C. Fluids were hypersaline and extremely aggressive (pH = 2-3.5). The composition of the fluids plots in the three-phase region of the H 2 O---CO 2 ---NaCl system (i.e., an "aqueous" liquid coexisting with a CO 2 -rich gas phase and halite).

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