Dolomitization and sulfate reduction in the mixing zone between brine and meteoric water in the newly exposed shores of the Dead Sea

Details Dolomitization and sulfate reduction in the mixing zone between brine and meteoric water in the newly exposed shores of the Dead Sea Dolomitization and sulfate reduction in the mixing zone between brine and meteoric water in the newly exposed shores of the Dead Sea

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.1135s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 51, Issue 5, pp.1135-1141

Computer Science

2

Scientific paper

Pleistocene dolomites are associated either with evaporative processes (such as in sabkhas and playas) or with a mixing zone where mixing between two different solutions ( e.g. seawater and groundwater) takes place. We report here on the very recent formation of dolomite at shallow depths (6-12 cm) in newly exposed, gypsum rich, sediments on the western shores of the Dead Sea. SEM and EDS analysis, as well as X-ray diffraction analysis indicate that this dolomite is euhedral and close to ideal dolomite in composition. These dolomite crystals differ from anhedral detrital Ca rich dolomites from the Cretaceous section of the watershed found in the whole section. Taking into account the sedimentation rate at the shore vicinity the maximal age of the euhedral dolomite was estimated as less than 60 years. In the three profiles analysed, euhedral dolomite was most abundant at a single layer where the gypsum content was locally lowered due to bacterial reduction of sulfate. The sediments solution at the Dead Sea shore localities represent a mixing zone between Dead Sea residual solution and subsurface freshwater springs. Under such conditions formation of dolomite occurs at highly saline environment, where very high Mg ++ / Ca ++ ratios are attained.

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