Water-rock interaction on Zabargad Island, Red Sea--A case study: II. From local equilibrium to irreversible exchanges

Details Water-rock interaction on Zabargad Island, Red Sea--A case study: II. From local equilibrium to irreversible exchanges Water-rock interaction on Zabargad Island, Red Sea--A case study: II. From local equilibrium to irreversible exchanges

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.2207s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 59, Issue 11, pp.2207-2213

Computer Science

Scientific paper

In spite of the complexity of the alteration paragenesis at Zabargad Island, the evolution of the chemical parameters is sufficiently continuous and smooth. This, through examination of the activity coefficients of solutes, allows a tentative appraisal of reaction kinetics in the quasistationary state, i.e., calculated fluid molalities are related to an overall progress variable (~) and the compositional matrix is solved on the main solid phases (olivine, chrysotile, tremolite, diopside, enstatite, dolomite, amorphous silica) by application of three external constraints (absolute reaction rates of amorphous silica and pyroxenes ), which allow contemporaneous evaluation of the overall rate of the system. The absolute reaction rates obtained are internally consistent and agree with field observations. The highest (negative) reaction rates of olivine gem formation are observed in the zone of the thermal maximum, coupled with a high (positive) rate of chrysotile dissolution and (negative) tremolite production. Dolomite is near a detailed balancing condition throughout the process.

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