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TitleChronology of Quaternary shoreline progradational sequences related to eustatic sea-level changes: sedimentation and subsidence in Saronikos Gulf, Greece
AuthorFoutrakis, P M; Anastasakis, G; Piper, D J WORCID logo
SourceMarine Geology vol. 428, 106278, 2020 p. 1-21,
Alt SeriesNatural Resources Canada, Contribution Series 20200130
Mediapaper; on-line; digital
File formatpdf; html
AreaSaronikos Gulf; Aegean Sea; Greece
Lat/Long WENS 20.0000 30.0000 40.0000 35.0000
Lat/Long WENS 23.8333 23.8333 38.1667 37.5000
Subjectsgeochronology; marine geology; surficial geology/geomorphology; stratigraphy; sedimentology; tectonics; Nature and Environment; Science and Technology; geophysical interpretations; seismic interpretations; seismic profiles; cores; marine sediment cores; paleogeography; Pleistocene; Pliocene; systematic stratigraphy; sea level changes; depositional history; sedimentation rates; tectonic history; subsidence; faulting; folds; marine sediments; basement geology; structural features; faults; sedimentary wedges; Aegina Basin; Agios Georgios Fault; Methana Basin; Cyclades Plateau; Poros-Agios Georgios Plateau; Phanerozoic; Cenozoic; Quaternary; Tertiary
Illustrationslocation maps; tables; seismic profiles; stratigraphic columns; stratigraphic charts
Released2020 06 23
AbstractThe stacking pattern of shoreline progradational sequences in subsiding basins have been used as a chronologic tool in the Mediterranean region. Most previous studies have used a few key seismic lines seaward of deltas, where the record is complicated by deltaic distributary switching. Southeastern Saronikos Gulf, in the western Aegean Sea at the northwestern end of the South Aegean Arc, lacks large river input of sediment. The ENE-WSW and NW-SE trending neotectonic Aegina and Methana basins lie between the tectonically active Gulf of Corinth and the relatively stable Cyclades plateau. New high-resolution seismic profiles from southeastern Saronikos Gulf have been interpreted according to the principles of seismic and sequence stratigraphy. Alpine basement and marine Pliocene sediments have been recognized in the surrounding basin margins and more than 300 m and 150 m of unconsolidated sediments have been mapped in Aegina and Methana basin respectively. Progradational clinoforms that toplap against transgressive surfaces, have been traced along strike, leading to the establishment of a robust chronostratigraphic framework further controlled by sedimentation rates as extracted from cores. Southeastern Saronikos Gulf poses an outstanding example of development of progradational wedges formed within a microtidal, wave dominated regime of low sedimentation rates, between 2.8 cm/ka and 3.2 cm/ka, within the framework of low subsiding basins with rates between 0.03 and 0.31 m/ka. In this environment, more than 180 well preserved shoreline progradational units, with attributes similar to the ones reported from the Aegean and Eastern Mediterranean seas, have been mapped and correlated to sea level lowstands back to 866 ka. Deeper Mid-Pleistocene progradational units are also recognized, tentatively back to 1.4 Ma. Subsidence rate shows a dramatic decrease in the last 1 Ma and significant numbers of faults became inactive during the last 130 ka. In Early-Middle Quaternary, Methana basin was an isolated lake and extended terrestrial areas were shaped in the Poros-Agios Georgios plateau during sea level lowstands. Aegina basin was continuously connected to the Aegean through the Agios Georgios fault valley. This study demonstrates the robustness of chronology based on stacked shoreline progradational sequences and its applicability to determining rates of tectonic subsidence.

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