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Twenty two seismic profiles from the southwestern Caspian Sea were studied in order to define seismic facies and depositional environments of Pliocene sediments in this part of the basin. The sedimentary successions comprise five major seismic facies: 1) chaotic facies, 2) subparallel facies, 3) clinoform prograding facies, 4) mounded facies and 5) parallel facies. Chaotic facies mainly characterize Cretaceous sediments which are separated from Lower Pliocene sediments by a distinctive disconformity. The facies is also found as a result of mud diapirism in several parts of the study area. Subparallel seismic facies are composed of non-marine sedimentary successions. The continuity of this seismic facies is enhanced basinward showing an increase in marine sedimentation conditions. Major part of the studied successions is composed of prograding clinoforms and mounded seismic facies attributed to the fluvially dominated deltaic complexes and their associated deepwater mounded turbidites. The upper most parallel seismic facies are, most probably, indicative of dominance of marine sedimentation conditions.
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