isabelle moretti - Academia.edu (original) (raw)
Papers by isabelle moretti
Aapg Bulletin - AAPG BULL, 1988
Combined structural and biostratigraphic analyses and seismic interpretation help them to balance... more Combined structural and biostratigraphic analyses and seismic interpretation help them to balance cross sections through the southern Apennines from the Adriatic to the Tyrrhenian Sea and to propose an overall model for the evolution of the belt. Three lithostratigraphic units have been distinguished according to their Mesozoic facies and style of deformation: the western platform (upper unit), the Lagonegro-Molise basin, and the eastern platform. Foreland deformation migrated from west to east, and external domains were reached progressively by synorogenic flysch deposits (foredeep) and later incorporated into the thrust sheets. Presently, only the most external part of the eastern platform is still unaffected by thrusting, while internal parts are building the overthrust belt at depth, which is masked on the surface by allochthonous basinal nappes. The evolutive geometry of thrust and piggy-back basins results from the continuous understacking of new material at the bottom of the ...
An integrated study of the stratigraphy, structure, sedimentology, and geomorphology of the Akrat... more An integrated study of the stratigraphy, structure, sedimentology, and geomorphology of the Akrata-Derveni region (southern coast of the Gulf of Corinth, Greece) forms the basis for a tectono-stratigraphic model for the evolution of the Plio-Pleistocene central Corinth Rift.
This paper describes the structures observed on cores and image logs in AG10 well. The Aigion Fau... more This paper describes the structures observed on cores and image logs in AG10 well. The Aigion Fault architecture, including the damage zone, a 13 m-thick brecciated zone and fault core, are characterised. Structures predating the recent extension phase are numerous. Tectonic stylolites and sheared bed boundaries are related to the Hellenides compression trending ENE-WSW. The origin of bed parallel protobreccias and microstructures indicating east-west extension is discussed. These observations together with hydraulic data illustrate how image logs and cores can help us to understand the impact of tectonic fabric on fluid flow in carbonates. To cite this article: J.-M. Daniel et al., C. R. Geoscience 336 (2004). 2004 Académie des sciences. Published by Elsevier SAS. All rights reserved. Résumé Analyse macro-structurale du puits AG10 (golfe de Corinthe, Grèce). Les structures interceptées par le puits AG10 sont décrites en utilisant les carottes et des logs d'imagerie. L'architecture de la faille d'Aigion, composée d'une zone endommagée, d'une zone de brèche de 13 m d'épaisseur et de son coeur, est caractérisée. Les structures antérieures à l'extension récente sont nombreuses. Les stylolites tectoniques et les cisaillements interbancs sont reliés à la compression alpine. L'origine de niveaux de protobrèches parallèles à la stratification et des structures indiquant une extension est-ouest est discutée. Ces observations, comparées aux données hydrauliques, illustrent comment les logs d'imagerie et les carottes permettent de comprendre le rôle des fabriques tectoniques sur les écoulements dans les carbonates. Pour citer cet article : J.-M. Daniel et al., C. R. Geoscience 336 (2004).
Tectonophysics, 2002
A quantitative analysis of the various parameters influencing the thermal regime in orogenic belt... more A quantitative analysis of the various parameters influencing the thermal regime in orogenic belts and related foredeeps shows that (i) the increasing heat flow in internal zones is mainly due to the thickening of radiogenic layers, although there is no simple proportionality between crustal thickness and heat flow signal at large scale; (ii) in external zones, where the horizontal strain rate is large (such as in the Bolivian Andes), surface processes can be of first order within the first kilometers of the crust. Hence, they induce a large scatter in the thermal data which are acquired at shallow depths. The deep thermal regime can be restored only by a quantitative assessment of these parameters. Active erosion (respectively sedimentation) can increase (resp. reduce) the heat flow by a factor of 2 in the uppermost kilometers. The effects of fluid circulation percolating at depth can also generate significant local disturbances. Other processes such as heat advection during thrusting, surface morphology and climate change have a minor influence in most settings, compared to the aforesaid effects. In the Bolivian Sub Andean Zone, between 18°S and 22°S, the very active deformation enhances the surface thermal perturbations (particularly erosion and sedimentation) and disturb the thermal field. The analysis of these data accounting for the kinematics of the belt allows the lateral variations of the thermal regime at various scales to be assessed. A slight eastward increase in the thermal regime towards the Chaco plain is evidenced as well as towards the Boomerang area, as the Mesozoic and Cenozoic sedimentary cover gets thinner. D
Tectonophysics, 2006
This paper reviews the data concerning the fracture network and the hydraulic characteristics of ... more This paper reviews the data concerning the fracture network and the hydraulic characteristics of faults in an active zone of the Gulf of Corinth. Pressure gap measured through fault planes shows that in this area the active normal faults (Aigion, Helike) act, at least temporarily and locally, as transversal seal. The analysis of the carbonate cements in the fractures on both the hangingwall and the footwall of the faults also suggests that they have acted as local seals during the whole fault zone evolution. However, the pressure and the characteristics of the water samples measured in the wells indicate that meteoric water circulates from the highest part of the relief to the coast, which means it goes through the fault zones. Field quantitative analysis and core studies from the AIG-10 well have been performed to define both regional and fault-related fracture networks. Then laboratory thin section observations have been done to recognize the different fault rocks characterizing the fault zone components. These two kinds of approach give information on the permeability characteristics of the fault zone. To synthesize the data, a schematic conceptual 3D fluid flow modeling has been performed taking into account fault zone permeability architecture, sedimentation, fluid flow, fault vertical offset and meteoric water influx, as well as compaction water flow. This modeling allows us to fit all the data with a model where the fault segments act as a seal whereas the relays between these segments allow for the regional flow from the Peloponnese topographic highs to the coast.
Tectonophysics, 2007
... Late Quaternary basin evolution of the Gulf of Corinth: Sequence stratigraphy, sedimentation,... more ... Late Quaternary basin evolution of the Gulf of Corinth: Sequence stratigraphy, sedimentation, faultslip and subsidence rates. V. Lykousis a , Corresponding Author Contact Information , E-mail The Corresponding Author , D. Sakellariou a , I. Moretti b and H. Kaberi a. ...
Tectonophysics, 2007
An integrated study of the stratigraphy, structure, sedimentology, and geomorphology of the Akrat... more An integrated study of the stratigraphy, structure, sedimentology, and geomorphology of the Akrata-Derveni region (southern coast of the Gulf of Corinth, Greece) forms the basis for a tectono-stratigraphic model for the evolution of the Plio-Pleistocene central Corinth Rift.
Tectonics, 2004
1] Orogenic building leaves a complex heritage consisting of a stack of nappes that may have cont... more 1] Orogenic building leaves a complex heritage consisting of a stack of nappes that may have contrasting lithologic structures resulting in heterogeneous mechanical behavior of the system during the postorogenic stages. While the thermal state of the region is reequilibrating, strong lateral variations of the depth to the brittle-ductile transition develop as a consequence of these preexisting heterogeneities.
Oil & Gas Science and Technology, 2005
Les processus diagénétiques peuvent-ils influencer à court terme le comportement hydraulique dans... more Les processus diagénétiques peuvent-ils influencer à court terme le comportement hydraulique dans une faille ? -L'objectif de cette étude est de quantifier l'impact du colmatage de fractures par de la calcite sur le comportement hydraulique d'une faille active dans les carbonates. Le contexte est celui de la faille sismique d'Aigion, dans le golfe de Corinthe, en Grèce, étudiée dans le cadre du Corinth Rift Laboratory (CRL). Ce travail repose sur l'examen de carottes et d'échantillons de fluides recueillis de part et d'autre de la faille lors d'une campagne de forage. Les données incluent les informations pétrostructurales des carottes, la géochimie des fluides du toit de la faille, ainsi que l'imagerie de puits et les tests de pompage. Les échantillons montrent un grand nombre de fractures récentes partiellement ou complètement colmatées par des cristaux de calcite. Nous avons modélisé les interactions eau/roche pour quantifier le taux de croissance de la calcite dans ces fractures. Cette modélisation fut menée avec Diaphore, un logiciel spécialement conçu pour étudier l'évolution diagénétique de la porosité dans les réservoirs pétroliers. Les résultats montrent que le temps requis pour colmater une fracture de 1 mm d'épaisseur, dans le cas de la faille d'Aigion, à 760 m de profondeur, est de l'ordre de la centaine d'années, avec la composition de l'eau échantillonnée dans la zone de fracture. En conséquence, les processus diagénétiques peuvent avoir une influence sur le comportement hydraulique à l'échelle du cycle sismique. Cependant, le comportement de la calcite dépend largement de la composition du fluide. Des tests réalisés avec une eau marine et une valeur légèrement plus élevée de pCO 2 , c'est-à-dire dans des conditions vraisemblables à proximité de la faille, montrent qu'au contraire, il peut y avoir dissolution de la calcite.
Journal of South American Earth Sciences, 2010
... unique. All the Early Cretaceous shales from the Villeta Fm have source rock potential and so... more ... unique. All the Early Cretaceous shales from the Villeta Fm have source rock potential and some authors consider the Early Cretaceous (Paja Fm, Tricheta Fm) as the main one in the northern MMV (Garcia and Para, 2003). ...
Journal of Geodynamics, 2003
The Gulf of Corinth is often considered as a typical example of a more or less simple half graben... more The Gulf of Corinth is often considered as a typical example of a more or less simple half graben with major border faults to the south and a flexure of the northern shore. This paper reviews new data, especially subsurface data, from both onshore and offshore, compiled or acquired through the Corinth Rift Laboratory EEC project. This data indicate that (1) the Gulf of Corinth is bordered both north and south by active faults; (2) there is a lot of them, and not only the one bordering the Peloponnese coastline are still active; and (3) distinct opening phases may be recognized on the area. During the first phase, the depocenter was located near the northern shore, whereas during the most recent phase, and only in the centre and the eastern sector, the depocenter moved towards the southern shore. Furthermore, active tectonic, in this western sector, is characterised by a general uplift of the Peloponnese that leads to the formation of new faults, i.e. the Doumena, Aigion and Helike faults and to selective reactivation of older ones such as the Pirgaki fault. We suggest that this current tectonic phase started about 150-120 000 years ago in the Aigion area and about 350 000 years ago eastward (Corinth-city) and that it represents a third opening phase during the growth of the Gulf of Corinth. #
Comptes Rendus Geoscience, 2004
Long-piston coring in the central Gulf of Corinth Basin was performed in 2001 on board the RSS Ma... more Long-piston coring in the central Gulf of Corinth Basin was performed in 2001 on board the RSS Marion Dufresne, enabling the recovery of lacustrine sediments buried at 12-13.5 mbsf below Holocene marine sediments. The lacustrine sequence consists of varve-like muddy, organically rich, layers interbedded with silty and fine sand turbidites. AMS dating determined the age of the marine-lacustrine interface at 13 kyr BP. Vertical fault slip rates were measured by using fault offsets of correlated reflectors. The maximum subsidence rate of the depocentre (3.6 mm yr −1 ) exceeds the maximum sedimentation rate by 1.8 mm yr −1 , which, consequently, corresponds to the rate of deepening of the basin floor. Data on the water level during the last glacial period indicate that the Corinth-Lake level was about 80 m lower than the present sea level. Inflow of seawater through the Rio-Antirio sill, as a consequence of the last eustatic sea level rise, may have caused catastrophic marine flooding phenomena in the Gulf of Corinth, similar to the one reported from the Black Sea. To cite this article: I. Moretti et al., C. R. Geoscience 336 (2004). 2004 Académie des sciences. Published by Elsevier SAS. All rights reserved. Résumé Sédimentation et vitesse de subsidence dans le golfe de Corinthe : données acquises grâce aux carottes du Marion Dufresne. Les carottages faits à partir du navire océanographique le Marion Dufresne dans le golfe de Corinthe en 2001 ont permis d'échantillonner les sédiments lacustres présents à partir d'environ 12-13,5 m sous les sédiments marins holocènes. La séquence lacustre consiste en des alternances de varves sablo-silteuses riches en matière organique et de turbidites distales. Les datations AMS indiquent un âge d'environ 13 000 ans BP pour l'interface lacustre/marin. La vitesse de déplacement le long des failles a été déduite à partir de ces données et des lignes sismiques disponibles. La vitesse de subsidence maximum, dans le dépôt-centre du Golfe, est estimée à 3,6 mm a −1 , dépassant la vitesse de sédimentation maximale (1,8 mm a −1 ) et conduisant à l'approfondissement de l'interface eau-sédiment. Les données sur le niveau des eaux durant la période lacustre suggèrent qu'une transgression marine catastrophique similaire à celle décrite en mer Noire, a pu aussi se produire dans le golfe de Corinthe. Pour citer cet article : I. Moretti et al., C. R. Geoscience 336 (2004).
Comptes Rendus Geoscience, 2004
... Grain size is highly variable, stylolitic fissures are abundant and large, normally cutting t... more ... Grain size is highly variable, stylolitic fissures are abundant and large, normally cutting the length axis of the major number of crystals. 18, Northern shore. ... 23, Northern shore, near Itea, Highly variable size grain could reflect a multi-generation fabric of pure white calcite. ...
Comptes Rendus Geoscience, 2004
This paper describes the structures observed on cores and image logs in AG10 well. The Aigion Fau... more This paper describes the structures observed on cores and image logs in AG10 well. The Aigion Fault architecture, including the damage zone, a 13 m-thick brecciated zone and fault core, are characterised. Structures predating the recent extension phase are numerous. Tectonic stylolites and sheared bed boundaries are related to the Hellenides compression trending ENE-WSW. The origin of bed parallel protobreccias and microstructures indicating east-west extension is discussed. These observations together with hydraulic data illustrate how image logs and cores can help us to understand the impact of tectonic fabric on fluid flow in carbonates. To cite this article: J.-M. Daniel et al., C. R. Geoscience 336 (2004). 2004 Académie des sciences. Published by Elsevier SAS. All rights reserved. Résumé Analyse macro-structurale du puits AG10 (golfe de Corinthe, Grèce). Les structures interceptées par le puits AG10 sont décrites en utilisant les carottes et des logs d'imagerie. L'architecture de la faille d'Aigion, composée d'une zone endommagée, d'une zone de brèche de 13 m d'épaisseur et de son coeur, est caractérisée. Les structures antérieures à l'extension récente sont nombreuses. Les stylolites tectoniques et les cisaillements interbancs sont reliés à la compression alpine. L'origine de niveaux de protobrèches parallèles à la stratification et des structures indiquant une extension est-ouest est discutée. Ces observations, comparées aux données hydrauliques, illustrent comment les logs d'imagerie et les carottes permettent de comprendre le rôle des fabriques tectoniques sur les écoulements dans les carbonates. Pour citer cet article : J.-M. Daniel et al., C. R. Geoscience 336 (2004).
Aapg Bulletin - AAPG BULL, 1988
Combined structural and biostratigraphic analyses and seismic interpretation help them to balance... more Combined structural and biostratigraphic analyses and seismic interpretation help them to balance cross sections through the southern Apennines from the Adriatic to the Tyrrhenian Sea and to propose an overall model for the evolution of the belt. Three lithostratigraphic units have been distinguished according to their Mesozoic facies and style of deformation: the western platform (upper unit), the Lagonegro-Molise basin, and the eastern platform. Foreland deformation migrated from west to east, and external domains were reached progressively by synorogenic flysch deposits (foredeep) and later incorporated into the thrust sheets. Presently, only the most external part of the eastern platform is still unaffected by thrusting, while internal parts are building the overthrust belt at depth, which is masked on the surface by allochthonous basinal nappes. The evolutive geometry of thrust and piggy-back basins results from the continuous understacking of new material at the bottom of the ...
An integrated study of the stratigraphy, structure, sedimentology, and geomorphology of the Akrat... more An integrated study of the stratigraphy, structure, sedimentology, and geomorphology of the Akrata-Derveni region (southern coast of the Gulf of Corinth, Greece) forms the basis for a tectono-stratigraphic model for the evolution of the Plio-Pleistocene central Corinth Rift.
This paper describes the structures observed on cores and image logs in AG10 well. The Aigion Fau... more This paper describes the structures observed on cores and image logs in AG10 well. The Aigion Fault architecture, including the damage zone, a 13 m-thick brecciated zone and fault core, are characterised. Structures predating the recent extension phase are numerous. Tectonic stylolites and sheared bed boundaries are related to the Hellenides compression trending ENE-WSW. The origin of bed parallel protobreccias and microstructures indicating east-west extension is discussed. These observations together with hydraulic data illustrate how image logs and cores can help us to understand the impact of tectonic fabric on fluid flow in carbonates. To cite this article: J.-M. Daniel et al., C. R. Geoscience 336 (2004). 2004 Académie des sciences. Published by Elsevier SAS. All rights reserved. Résumé Analyse macro-structurale du puits AG10 (golfe de Corinthe, Grèce). Les structures interceptées par le puits AG10 sont décrites en utilisant les carottes et des logs d'imagerie. L'architecture de la faille d'Aigion, composée d'une zone endommagée, d'une zone de brèche de 13 m d'épaisseur et de son coeur, est caractérisée. Les structures antérieures à l'extension récente sont nombreuses. Les stylolites tectoniques et les cisaillements interbancs sont reliés à la compression alpine. L'origine de niveaux de protobrèches parallèles à la stratification et des structures indiquant une extension est-ouest est discutée. Ces observations, comparées aux données hydrauliques, illustrent comment les logs d'imagerie et les carottes permettent de comprendre le rôle des fabriques tectoniques sur les écoulements dans les carbonates. Pour citer cet article : J.-M. Daniel et al., C. R. Geoscience 336 (2004).
Tectonophysics, 2002
A quantitative analysis of the various parameters influencing the thermal regime in orogenic belt... more A quantitative analysis of the various parameters influencing the thermal regime in orogenic belts and related foredeeps shows that (i) the increasing heat flow in internal zones is mainly due to the thickening of radiogenic layers, although there is no simple proportionality between crustal thickness and heat flow signal at large scale; (ii) in external zones, where the horizontal strain rate is large (such as in the Bolivian Andes), surface processes can be of first order within the first kilometers of the crust. Hence, they induce a large scatter in the thermal data which are acquired at shallow depths. The deep thermal regime can be restored only by a quantitative assessment of these parameters. Active erosion (respectively sedimentation) can increase (resp. reduce) the heat flow by a factor of 2 in the uppermost kilometers. The effects of fluid circulation percolating at depth can also generate significant local disturbances. Other processes such as heat advection during thrusting, surface morphology and climate change have a minor influence in most settings, compared to the aforesaid effects. In the Bolivian Sub Andean Zone, between 18°S and 22°S, the very active deformation enhances the surface thermal perturbations (particularly erosion and sedimentation) and disturb the thermal field. The analysis of these data accounting for the kinematics of the belt allows the lateral variations of the thermal regime at various scales to be assessed. A slight eastward increase in the thermal regime towards the Chaco plain is evidenced as well as towards the Boomerang area, as the Mesozoic and Cenozoic sedimentary cover gets thinner. D
Tectonophysics, 2006
This paper reviews the data concerning the fracture network and the hydraulic characteristics of ... more This paper reviews the data concerning the fracture network and the hydraulic characteristics of faults in an active zone of the Gulf of Corinth. Pressure gap measured through fault planes shows that in this area the active normal faults (Aigion, Helike) act, at least temporarily and locally, as transversal seal. The analysis of the carbonate cements in the fractures on both the hangingwall and the footwall of the faults also suggests that they have acted as local seals during the whole fault zone evolution. However, the pressure and the characteristics of the water samples measured in the wells indicate that meteoric water circulates from the highest part of the relief to the coast, which means it goes through the fault zones. Field quantitative analysis and core studies from the AIG-10 well have been performed to define both regional and fault-related fracture networks. Then laboratory thin section observations have been done to recognize the different fault rocks characterizing the fault zone components. These two kinds of approach give information on the permeability characteristics of the fault zone. To synthesize the data, a schematic conceptual 3D fluid flow modeling has been performed taking into account fault zone permeability architecture, sedimentation, fluid flow, fault vertical offset and meteoric water influx, as well as compaction water flow. This modeling allows us to fit all the data with a model where the fault segments act as a seal whereas the relays between these segments allow for the regional flow from the Peloponnese topographic highs to the coast.
Tectonophysics, 2007
... Late Quaternary basin evolution of the Gulf of Corinth: Sequence stratigraphy, sedimentation,... more ... Late Quaternary basin evolution of the Gulf of Corinth: Sequence stratigraphy, sedimentation, faultslip and subsidence rates. V. Lykousis a , Corresponding Author Contact Information , E-mail The Corresponding Author , D. Sakellariou a , I. Moretti b and H. Kaberi a. ...
Tectonophysics, 2007
An integrated study of the stratigraphy, structure, sedimentology, and geomorphology of the Akrat... more An integrated study of the stratigraphy, structure, sedimentology, and geomorphology of the Akrata-Derveni region (southern coast of the Gulf of Corinth, Greece) forms the basis for a tectono-stratigraphic model for the evolution of the Plio-Pleistocene central Corinth Rift.
Tectonics, 2004
1] Orogenic building leaves a complex heritage consisting of a stack of nappes that may have cont... more 1] Orogenic building leaves a complex heritage consisting of a stack of nappes that may have contrasting lithologic structures resulting in heterogeneous mechanical behavior of the system during the postorogenic stages. While the thermal state of the region is reequilibrating, strong lateral variations of the depth to the brittle-ductile transition develop as a consequence of these preexisting heterogeneities.
Oil & Gas Science and Technology, 2005
Les processus diagénétiques peuvent-ils influencer à court terme le comportement hydraulique dans... more Les processus diagénétiques peuvent-ils influencer à court terme le comportement hydraulique dans une faille ? -L'objectif de cette étude est de quantifier l'impact du colmatage de fractures par de la calcite sur le comportement hydraulique d'une faille active dans les carbonates. Le contexte est celui de la faille sismique d'Aigion, dans le golfe de Corinthe, en Grèce, étudiée dans le cadre du Corinth Rift Laboratory (CRL). Ce travail repose sur l'examen de carottes et d'échantillons de fluides recueillis de part et d'autre de la faille lors d'une campagne de forage. Les données incluent les informations pétrostructurales des carottes, la géochimie des fluides du toit de la faille, ainsi que l'imagerie de puits et les tests de pompage. Les échantillons montrent un grand nombre de fractures récentes partiellement ou complètement colmatées par des cristaux de calcite. Nous avons modélisé les interactions eau/roche pour quantifier le taux de croissance de la calcite dans ces fractures. Cette modélisation fut menée avec Diaphore, un logiciel spécialement conçu pour étudier l'évolution diagénétique de la porosité dans les réservoirs pétroliers. Les résultats montrent que le temps requis pour colmater une fracture de 1 mm d'épaisseur, dans le cas de la faille d'Aigion, à 760 m de profondeur, est de l'ordre de la centaine d'années, avec la composition de l'eau échantillonnée dans la zone de fracture. En conséquence, les processus diagénétiques peuvent avoir une influence sur le comportement hydraulique à l'échelle du cycle sismique. Cependant, le comportement de la calcite dépend largement de la composition du fluide. Des tests réalisés avec une eau marine et une valeur légèrement plus élevée de pCO 2 , c'est-à-dire dans des conditions vraisemblables à proximité de la faille, montrent qu'au contraire, il peut y avoir dissolution de la calcite.
Journal of South American Earth Sciences, 2010
... unique. All the Early Cretaceous shales from the Villeta Fm have source rock potential and so... more ... unique. All the Early Cretaceous shales from the Villeta Fm have source rock potential and some authors consider the Early Cretaceous (Paja Fm, Tricheta Fm) as the main one in the northern MMV (Garcia and Para, 2003). ...
Journal of Geodynamics, 2003
The Gulf of Corinth is often considered as a typical example of a more or less simple half graben... more The Gulf of Corinth is often considered as a typical example of a more or less simple half graben with major border faults to the south and a flexure of the northern shore. This paper reviews new data, especially subsurface data, from both onshore and offshore, compiled or acquired through the Corinth Rift Laboratory EEC project. This data indicate that (1) the Gulf of Corinth is bordered both north and south by active faults; (2) there is a lot of them, and not only the one bordering the Peloponnese coastline are still active; and (3) distinct opening phases may be recognized on the area. During the first phase, the depocenter was located near the northern shore, whereas during the most recent phase, and only in the centre and the eastern sector, the depocenter moved towards the southern shore. Furthermore, active tectonic, in this western sector, is characterised by a general uplift of the Peloponnese that leads to the formation of new faults, i.e. the Doumena, Aigion and Helike faults and to selective reactivation of older ones such as the Pirgaki fault. We suggest that this current tectonic phase started about 150-120 000 years ago in the Aigion area and about 350 000 years ago eastward (Corinth-city) and that it represents a third opening phase during the growth of the Gulf of Corinth. #
Comptes Rendus Geoscience, 2004
Long-piston coring in the central Gulf of Corinth Basin was performed in 2001 on board the RSS Ma... more Long-piston coring in the central Gulf of Corinth Basin was performed in 2001 on board the RSS Marion Dufresne, enabling the recovery of lacustrine sediments buried at 12-13.5 mbsf below Holocene marine sediments. The lacustrine sequence consists of varve-like muddy, organically rich, layers interbedded with silty and fine sand turbidites. AMS dating determined the age of the marine-lacustrine interface at 13 kyr BP. Vertical fault slip rates were measured by using fault offsets of correlated reflectors. The maximum subsidence rate of the depocentre (3.6 mm yr −1 ) exceeds the maximum sedimentation rate by 1.8 mm yr −1 , which, consequently, corresponds to the rate of deepening of the basin floor. Data on the water level during the last glacial period indicate that the Corinth-Lake level was about 80 m lower than the present sea level. Inflow of seawater through the Rio-Antirio sill, as a consequence of the last eustatic sea level rise, may have caused catastrophic marine flooding phenomena in the Gulf of Corinth, similar to the one reported from the Black Sea. To cite this article: I. Moretti et al., C. R. Geoscience 336 (2004). 2004 Académie des sciences. Published by Elsevier SAS. All rights reserved. Résumé Sédimentation et vitesse de subsidence dans le golfe de Corinthe : données acquises grâce aux carottes du Marion Dufresne. Les carottages faits à partir du navire océanographique le Marion Dufresne dans le golfe de Corinthe en 2001 ont permis d'échantillonner les sédiments lacustres présents à partir d'environ 12-13,5 m sous les sédiments marins holocènes. La séquence lacustre consiste en des alternances de varves sablo-silteuses riches en matière organique et de turbidites distales. Les datations AMS indiquent un âge d'environ 13 000 ans BP pour l'interface lacustre/marin. La vitesse de déplacement le long des failles a été déduite à partir de ces données et des lignes sismiques disponibles. La vitesse de subsidence maximum, dans le dépôt-centre du Golfe, est estimée à 3,6 mm a −1 , dépassant la vitesse de sédimentation maximale (1,8 mm a −1 ) et conduisant à l'approfondissement de l'interface eau-sédiment. Les données sur le niveau des eaux durant la période lacustre suggèrent qu'une transgression marine catastrophique similaire à celle décrite en mer Noire, a pu aussi se produire dans le golfe de Corinthe. Pour citer cet article : I. Moretti et al., C. R. Geoscience 336 (2004).
Comptes Rendus Geoscience, 2004
... Grain size is highly variable, stylolitic fissures are abundant and large, normally cutting t... more ... Grain size is highly variable, stylolitic fissures are abundant and large, normally cutting the length axis of the major number of crystals. 18, Northern shore. ... 23, Northern shore, near Itea, Highly variable size grain could reflect a multi-generation fabric of pure white calcite. ...
Comptes Rendus Geoscience, 2004
This paper describes the structures observed on cores and image logs in AG10 well. The Aigion Fau... more This paper describes the structures observed on cores and image logs in AG10 well. The Aigion Fault architecture, including the damage zone, a 13 m-thick brecciated zone and fault core, are characterised. Structures predating the recent extension phase are numerous. Tectonic stylolites and sheared bed boundaries are related to the Hellenides compression trending ENE-WSW. The origin of bed parallel protobreccias and microstructures indicating east-west extension is discussed. These observations together with hydraulic data illustrate how image logs and cores can help us to understand the impact of tectonic fabric on fluid flow in carbonates. To cite this article: J.-M. Daniel et al., C. R. Geoscience 336 (2004). 2004 Académie des sciences. Published by Elsevier SAS. All rights reserved. Résumé Analyse macro-structurale du puits AG10 (golfe de Corinthe, Grèce). Les structures interceptées par le puits AG10 sont décrites en utilisant les carottes et des logs d'imagerie. L'architecture de la faille d'Aigion, composée d'une zone endommagée, d'une zone de brèche de 13 m d'épaisseur et de son coeur, est caractérisée. Les structures antérieures à l'extension récente sont nombreuses. Les stylolites tectoniques et les cisaillements interbancs sont reliés à la compression alpine. L'origine de niveaux de protobrèches parallèles à la stratification et des structures indiquant une extension est-ouest est discutée. Ces observations, comparées aux données hydrauliques, illustrent comment les logs d'imagerie et les carottes permettent de comprendre le rôle des fabriques tectoniques sur les écoulements dans les carbonates. Pour citer cet article : J.-M. Daniel et al., C. R. Geoscience 336 (2004).