Crust of weathering of peridotites from the Žepče area, the Dinaride Ophiolite Zone

The crust of weathering is developed in marginal parts of the small Žepče ultramafic body which is disconformably overlain by fresh-water sediments of the Žepče Neogene intramontane basin. 1.) Moderately serpentinized lherzolite make up the fresh zone; 2.) The transitional zone is composed of strongly serpentinized lherzolites crosscut by veinlets filled by magnesite, breunnerite, dolomite, ankerite, calcite, quartz and opal; 3.) The uppermost zone, overlain by Neogene fresh-water sediments, is composed of desintegrated ultramafic and mafic rocks mixed with nontronite-bearing soil. Sample from the all the three zones are constrained by optical method, X-ray difraction, electron-mmicroprobe and major and trace elements.