Article (Scientific journals)
Clinoform architecture influenced by salt tectonics and Quaternary Sea level changes: The Acheloos delta complex, Gulf of Patras, Greece
Stathopoulou, Aikaterini; Papatheodorou, George; Tripsanas, Efthymios et al.
2025In Marine Geology, 482, p. 107494
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Keywords :
Delta stratigraphy; Quaternary sequence stratigraphy; Salt tectonics; Sea level change; Sediment supply; Subsidence; 3-D seismics; Quaternary sequence; Rigid block; Sealevel change; Sequence stratigraphy; Study areas; Well data; Oceanography; Geology; Geochemistry and Petrology
Abstract :
[en] This study focuses on the evolution of the Acheloos river-dominated delta in western Greece. It is an area with limited published data, that serves as a link between the well-studied rift basin of the Gulf of Corinth and the active Kephalonia Transform Fault. The examination of a newly acquired 3D seismic cube and vintage well data in this area offers a rare opportunity to: i) develop a stratigraphic scheme for the evolution of river-dominated deltas in restricted basins influenced by salt tectonics, which can be applied as an analogue to similar deltas worldwide, and ii) re-evaluate the deformation style of the study area and challenge the widely accepted concept of its tectonic behavior as a rigid block. Detailed 3D seismic stratigraphy and well data revealed eleven progradational packages. These are attributed to the Acheloos activity during Pleistocene and exhibit distinctive spatial variation. Thickness distribution and trajectory analysis show that the delta developed in three stages: (i) poorly developed progradational units in a weakly subsiding basin, (ii) retrogradational delta units in a strongly subsiding basin and (iii) stabilization of the accommodation space and gradual basin infill through progradational units. Although the study area has been considered a rigid block, stratigraphic analysis revealed multiple subsidence events linked to the structural history of the basin. Additionally, seismic data reveal that salt tectonics have a significant impact on its evolution, affecting the locus of the depocenters and the subsidence rates. The deformation of the underlying strata shows that the salt diapiric activity intensified from 435 ka to present. This can either be attributed to the differential loading due to the continuous deltaic sedimentation and/or to the structural activity within the study area. Notably, the paroxysmal phase of salt tectonics occurs right after a large subsidence of the area of interest between 860 and 550 ka.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Stathopoulou, Aikaterini;  University of Patras, Department of Geology, Patras, Greece ; HELLENiQ Energy, Department of Exploration and Production of Hydrocarbons, Maroussi, Greece
Papatheodorou, George;  University of Patras, Department of Geology, Patras, Greece
Tripsanas, Efthymios;  HELLENiQ Energy, Department of Exploration and Production of Hydrocarbons, Maroussi, Greece
Hubert, Aurelia  ;  Université de Liège - ULiège > Département de géographie > Géomorphologie et Géologie du Quaternaire ; Université de Liège - ULiège > Sphères
Rubi, Romain ;  Université de Liège - ULiège > Département de géographie > Géomorphologie et Géologie du Quaternaire ; Total Energies, CVA Engineering, Carbone Storage Exploration Department, France
Geraga, Maria;  University of Patras, Department of Geology, Patras, Greece
Kokkalas, Sotirios;  University of Patras, Department of Geology, Patras, Greece
Stefatos, Aristofanis;  Hellenic Hydrocarbons and Energy Resources Management, Athens, Greece
Language :
English
Title :
Clinoform architecture influenced by salt tectonics and Quaternary Sea level changes: The Acheloos delta complex, Gulf of Patras, Greece
Publication date :
April 2025
Journal title :
Marine Geology
ISSN :
0025-3227
eISSN :
1872-6151
Publisher :
Elsevier
Volume :
482
Pages :
107494
Peer reviewed :
Peer Reviewed verified by ORBi
Funding text :
We are sincerely grateful to HelleniQ Energy S.A. for providing the Western Patraikos 3D seismic data, the Landmark software, as well as authorizing the publication of these results. We thank Energean Oil and Gas S.A. for authorizing the publication, as partners in the exploration block of Western Patraikos. We also acknowledge Hellenic Hydrocarbon & Energy Resources Management (HEREMA S.A.) for giving us access to legacy well data and authorizing the publication of the study. We thank Vangelis Kamberis for sharing his experience in the area. We are grateful to Tom Mckie for his language review and scientific input. Finally, we thank M. Rebesco and the three anonymous reviewers for their constructive remarks that largely improved the content of this paper.
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