Abstract
Coarse, crystalline dolomite which appears as irregular bodies in the Jurassic sequence of Mount Hermon, Israel, is connected to Pb 1bZn mineralization. Similar epigenetic dolomites are found in drill holes in the Triassic-Jurassic sequence in the northern Negev. The carbon- and the oxygen-isotopic composition suggests a hydrothermal origin for these dolomites. There is great similarity between the isotopic composition of carbon, oxygen and lead of the Hermon rocks and the Mississippi Valley type ore bodies. The decrease of δ 18O and δ 13C value in the country rock near basaltic dikes and near dolomite bodies also points to thermal activity during formation of the dolomite. The solution from which the dolomite precipitated necessarily was an 18O-rich solution, possibly connate water from Mesozoic formations, similar in composition to that found in contact with the dolomite in the northern Negev.
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