GEOSCAN Search Results: Fastlink


TitleAlternating marine and lacustrine sedimentation during late Quaternary in the Gulf of Corinth rift basin, central Greece
AuthorPerissoratis, C; Piper, D J W; Lykousis, V
SourceMarine Geology vol. 167, issue 3-4, 2000 p. 391-411,
LinksAbstract - Résumé
Alt SeriesGeological Survey of Canada, Contribution Series 1999039
PublisherElsevier BV
Mediapaper; on-line; digital
File formatpdf
Lat/Long WENS 21.0000 23.0000 38.5000 38.0000
Subjectsmarine geology; sedimentology; stratigraphy; sea level changes; sea level fluctuations; lacustrine environments; lacustrine deposits; deep basins; turbidity currents; deltas; basins; erosion; sedimentation; Quaternary
Illustrationslocation maps; bathymetric profiles; seismic reflection profiles; tables; stratigraphic columns; cross-sections, stratigraphic
AbstractThe Gulf of Corinth in central Greece has a maximum depth of about 900 m and is separated from the open sea by the Rion
Strait, with a sill depth of 62 m marked by an extensive submarine terrace. During eustatic sea-level lowstands, the Gulf of
Corinth was a lake. Under lacustrine conditions, stratified sediments accumulated in the deep-water basins and turbid underflows
from rivers eroded the basin slopes. As the sea level rose, marine waters flooded the Gulf and deltas prograded across the
shelves. In shallow-water areas, two key reflectors termed Z and X are terrace surfaces, commonly erosional, which mark the
base of the overlying deltaic sequences. In deep-water basins, Z and X mark the top of the acoustically stratified sediments
interpreted as lacustrine turbidites; reflectors Y and W mark the base of these stratified intervals and overlie acoustically
transparent sections similar to the Holocene section. The last lacustrine conditions in the Gulf (Z to Y) were during isotopic
stage 2 and terminated about 12 000 yr ago. Age estimates based on sedimentation rates suggest that the X to W interval
corresponds to the stage 4 lowstand of sea level. In the western Gulf of Corinth, shoreline transgressive surfaces corresponding
to minor transgressions in stage 5 and to major transgression at the end of stage 6 are recognised. This seismic stratigraphy
permits a detailed interpretation of the history of the Gulf of Corinth in the past hundred thousand years. It also provides a
general model for sedimentation in rift basins in which marine and lacustrine sediments alternate.