Abstract
A Paleocene basin-fill succession (Dizilita¢ler Formation) has been studied in an area north of Ankara, Turkey. This basin-margin elastic succession comprises basal alluvial deposits (250 m thick), few vertically stacked marine fan-delta sequences (450 m), and sandy turbiditic deposits (650 m) at the top. The overall stratigraphic facies pattern is transgressive, but the fan-delta sequences represent major regressive (shoreline progradation) pulses. Fringing and patchy carbonate reefs separate these sequences, marking the favourable climate and a reduction in clastic influx during the episodes of fan-delta drowning due to relative rises of sea level. The fan-delta system was persistently dominated by gravelly mass flows, with subordinate braided-stream distributaries. The morphology, particularly slope inclination, of the successive fan-delta wedges was each determined largely by the magnitude of the preceding sea-level rise (actual water depth) which itself controlled the type of reefs. The basin was subsiding, and the five pulses of coarse-clastic influx separated by abrupt sea-level rises are attributed to active faulting at the basin margin. Broader down-faulting and basin expansion promoted deeper-marine turbiditic sedimentation.
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