The present paper dealsprimarily with the mineralogical. geochemicaland isotopiccharacteristics of somemodem carbonate sedimentsrecoveredfrom four short coresfrom the Gulf of Suezoff Sukhna. These cores lie between32°44' and 32°48' E and28°58' and 29°16' N. The paper aims to figure out the variouscontrols on the .minerals accumulation in the Gulf of Suez and to evaluatethe chemical and isotopic variations in these sediments. Mineralogicalinvestigations reveal the presence of Mg-ca1cite andaragonite as the dominant minerals with subordinateamounts of calcite and dolomite. The Sr . values calculatedfor the studied cores suggest the mixed origin angomlll of aragonite, i.e. it is derived from mixturesof skeletal(mollusks andcorals)and nonskeletal. Both Mg and Mn favor the incorporation into the embryonicforms of the biotic and abioticcalcite andMg-calcitecrystalsThe verticaldistribution profilesof Ca, Mg, Sr, Fe, Mn and Ba and also oxygen and carbon stable isotopesin the studiedcores exhibitsignificantrelations with the mineralogy. Both elementalvalues and isotopic signatures of the investigatedsamples are in accord with the significantrole played by biologicalprocesses in the productionof carbonate sediments in the Gulf of Suez.
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