A geochemical study of a fossil oceanic hydrothermal discharge zone in the Oman Ophiolite (Zuha sulphide prospect): evidence for a polyphased hydrothermal history

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Abstract

The geochemical study was focused on a pair of boreholes which were drilled at the foot of the main gossan, on the border of a 400 ppm Cu geochemical anomaly. The geochemistry data establish two main alteration styles which developed in the V1 lavas around the Zuha prospect. The diversity of chemical and isotopic compositions of the type I and type II alterations reflects distinct temperatures, water/rock ratios and fluid compositions, and suggests that these two types of alteration were formed in different parts of the same hydrothermal system. It is proposed that the hydrothermal system developed in previously altered oceanic crust whose Sr isotopic composition was further shifted. These two alteration stages were successively activated by the first axial magmatic event (V1 type magmatism) and the second post accretion magmatic event (V2 type magmatism) and the second post accretion magmatic event (V2 type magmatism). The secondary mineralogical assemblages observed in the V1 lavas and in the diabases from the dike complex were recrystallized during this second alteration stage. Preliminary data obtained on epidote-rich dikes and their host diabases in this Salahi block dike complex are also presented. -from Authors

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Regba, M., Agrinier, P., Pflumio, C., & Loubet, M. (1991). A geochemical study of a fossil oceanic hydrothermal discharge zone in the Oman Ophiolite (Zuha sulphide prospect): evidence for a polyphased hydrothermal history. Ophiolite Genesis and Evolution of the Oceanic Lithosphere. Proc. Conference, Muscat, 1990, 353–383. https://doi.org/10.1007/978-94-011-3358-6_18

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