A sedimentary archive corresponding to the last 17 cal kyr BP has been studied by means of a gian... more A sedimentary archive corresponding to the last 17 cal kyr BP has been studied by means of a giant piston core retrieved on board R/V MARION-DUFRESNE in the North Central Gulf of Corinth. Based on previous methodological improvements, grain-size distribution and Magnetic Susceptibility Anisotropy (MSA) have been analysed in order to detect earthquake-induced deposits. We indentified 36 specific layers -Homogenites+Turbidites (HmTu) - intercalated within continuous hemipelagictype sediments (biogenic or bio-induced fraction and fine-grained siliciclastic fraction). The whole succession is divided into a non-marine lower half and a marine upper half. The “events” are distributed through the entire core and they are composed of two terms: a coarse-grained lower term and an upper homogeneous fine-grained term, sharply separated. Their average time recurrence interval could be estimated for the entire MD01-2477 core. The non-marine and the marine sections yielded close estimated values f...
A sedimentary archive corresponding to the last 17 cal kyr BP has been studied by means of a gian... more A sedimentary archive corresponding to the last 17 cal kyr BP has been studied by means of a giant piston core retrieved on board R/V MARION-DUFRESNE in the North Central Gulf of Corinth. Based on previous methodological improvements, grain-size distribution and Magnetic Susceptibility Anisotropy (MSA) have been analysed in order to detect earthquake-induced deposits. We indentified 36 specific layers -Homogenites+Turbidites (HmTu) - intercalated within continuous hemipelagictype sediments (biogenic or bio-induced fraction and fine-grained siliciclastic fraction). The whole succession is divided into a non-marine lower half and a marine upper half. The “events” are distributed through the entire core and they are composed of two terms: a coarse-grained lower term and an upper homogeneous fine-grained term, sharply separated. Their average time recurrence interval could be estimated for the entire MD01-2477 core. The non-marine and the marine sections yielded close estimated values f...
The north-western Alps foreland is considered as still experiencing distal effects of Alpine coll... more The north-western Alps foreland is considered as still experiencing distal effects of Alpine collision, resulting in both horizontal and vertical relative displacements. Based on seismological and geodetic surveys, detailed patterns of active faulting (including subsurface décollements, blind ramps and deeper crustal thrusts have been proposed (Thouvenot et al., 1998), underlining the importance of NW–SE left-lateral strike-slip offsets as along the Vuache and Culoz faults (cf. the 1996 Epagny event: M=5.4; Thouvenot et al., 1998 and the 1822 Culoz event I=VII-VIII; Vogt, 1979). In parallel to this tectonic evolution, the last glaciation-deglaciation cycles contributed to develop large and over-deepened lacustrine basins, such as Lake Le Bourget (Perrier, 1980). The fine grain, post LGM (ie post 18 ky), sedimentary infill gives a good opportunity to evidence late quaternary tectonic deformations. This study focuses on the Culoz fault, extending from the Jura to the West, to the Chau...
In January 2006, 76 high-resolution reflection seismic profiles were acquired in the Gulf of Cari... more In January 2006, 76 high-resolution reflection seismic profiles were acquired in the Gulf of Cariaco, Northeast Venezuela. In the upper 100 m of sedimentary infill, 17 unconformity-bounded sequences were identified and mapped throughout the basin. Up to now, no core or borehole information is available to provide age constraints on these units. The sedimentary infill is cut by several faults,
Eduardo CARRILLO (1), Franck AUDEMARD (2), Christian BECK (3) and Michel COUSIN (3) ... (1) Univ.... more Eduardo CARRILLO (1), Franck AUDEMARD (2), Christian BECK (3) and Michel COUSIN (3) ... (1) Univ. Central de Venezuela, Fac. de Ciencias, Inst. Ciencias de la Tierra. (ecarrill@gea.ciens.ucv.ve) ... (2) Fundación Venezolana de Investigaciones ...
... par Hubert ARNAUD i, Annie ARNAUD-VANNEAU i, Luc Georges BULOT 2, Christian BECK 3, Oliver MA... more ... par Hubert ARNAUD i, Annie ARNAUD-VANNEAU i, Luc Georges BULOT 2, Christian BECK 3, Oliver MACSOTAY 4, Jean-François STEPHAN 5 et Victor ... Comme l'avait indiqué Rosales [1959], pour les géologues de l'époque tous les calcaires massifs situés au-dessous de la ...
Asf Association Des Sedimentologistes Francais, 2001
La vallee de la Basse Moulouya s'etend du Rif oriental jusqu'a la frontiere algerienne et... more La vallee de la Basse Moulouya s'etend du Rif oriental jusqu'a la frontiere algerienne et est caracterisee par un climat semi-aride. Cette vallee est etroite avec un chenal sinueux et encaisse dont la pente moyenne est de 0,02 %. Dans ses 25 derniers km, a l'est de la terminaison orientale des Kebdana, la Moulouya a depose pendant l'Holocene des alluvions Epaisses (jusqu'a 15m) formant actuellement une terrasse T1 bien marquee dans le paysage. En amont, a Garma, la surface de la T1 est subdivisee en deux niveaux T1 et T2: l'escarpement topographique, haut de 2,5 m et long de 100 m, est oriente transversalement par rapport a l'axe de la Moulouya. Les sediments fluviatiles sont sableux a facies de type barre et silto-agileux a facies de type plaine d'inondation. Ils renferment des indices multiples de deformation syn- et postsedimentaire (seismites, failles et diaclases) qui montrent la continuite de l'activite tectonique a l'Holocene dans ce secteur et permettent d'en preciser la chronologie et d'en quantifier les effets: - incision de la Moulouya, pouvant atteindre 15m, dans les depots de la T1; - niveau a sels (halite, gypse) marquant une transgression marine vers 5 ka BP et souleve de 11,5 m a 20 km du littoral (exhaussement moyen: 2,3 mm.an-1); - structures de fluage et liquefaction, fractures cosismiques anterieures et posterieures a 5 ka BP; - sols interstratifies marquant des arrets de sedimentation; - faille decalant la surface de la T1 de 2 m.
ABSTRACT Analysis of sediments and morpho-structural elements of the last 25 km of the lower Moul... more ABSTRACT Analysis of sediments and morpho-structural elements of the last 25 km of the lower Moulouya valley has shown that this river evolved during the middle and upper Holocene in a tectonic context of uplift, at the South-Eastern end of the Kebdana Mountains. This geodynamic context limited the sedimentation and inhibited the formation of a delta on the Mediterranean shore. A brief sedimentary episode allowed about 10 m of sediments to be deposited, forming a well-marked alluvial terrace. The sedimentation appeared before 3,750 years cal BC in connection with the Holocene sea transgression (“Mellahian” period) and a probably more humid period. It developed at an average rate of 0.6 mm.a–1, five kilometres from the shoreline, before stopping just after 395 years cal BC, at the same time as the post- Mellahian regression. The sediments show evidence of syn- and post-sedimentary seismic activity (seismites, diaclases, faults). They also show some traces of the “Mellahian” transgression (beds containing halite and gypsum) which indicate an average rise of 2.0 mm.a–1 since about 3,700 years cal BC, 22 km from the Moulouya mouth. The sediment composition indicates a subarid climate during the Holocene, but does not enable possible climatic variations to be detected.
... Congrès 8e congrès français de sédimentologie : ( Orléans, 12-14 novembre 2001, livres desrés... more ... Congrès 8e congrès français de sédimentologie : ( Orléans, 12-14 novembre 2001, livres desrésumés et des excursions ) Congrès français de sédimentologie N o 8, Orléans , FRANCE (12/11/2001) 2001 , n o 37[Note(s) : XIX, 375 ; 77 p., ] (2 ref.) ISBN 2-907205-35-8 ; 2 ...
ABSTRACT A giant RV Marion Dufresne piston core MD01-2425 recovered from the 1276 m-deep Çınarcık... more ABSTRACT A giant RV Marion Dufresne piston core MD01-2425 recovered from the 1276 m-deep Çınarcık Basin of the Sea of Marmara documents characteristics of deep basin sedimentation influenced by large-scale gravity-controlled mass-wasting processes and associated turbidite deposition during the Late Pleistocene to Holocene. A visual lithological description of the core reveals twenty major seismoturbidite layers (> 20 cm thick), intercalated in hemipelagic-type fine-grained calcareous and slightly siliceous clays. The thickness and frequency of the sesimoturbidite layers deposited during the lacustrine period (prior to 12.3 cal ka BP) is much greater than during the Holocene marine period. The sedimentary processes during deposition of seismoturbidites in the basin have been determined in this study using a combination of grain-size parameters. Often the seismoturbidites show strong grain segregation with a sharp boundary between a coarse lower and a homogeneous upper part. The traction carpet deposits formed at the base of a turbulent suspension and were produced in the lower coarse-grained part, whereas the homogeneous upper part was deposited by uniform suspensions following bedload deposition.
In 1988, the history of GNSS geodetic measurements with the goal of studying fault kinematics in ... more In 1988, the history of GNSS geodetic measurements with the goal of studying fault kinematics in Venezuela begins with one of the first civil efforts, the Central and South America (CASA) Project. Since then, and for more than two decades now, several authors have been contributing with the ultimate target: To determine slip rates of plate boundary faults in order to understand the active tectonics at the Caribbean South America plate interactions. Recently, the interest on kinematics GNSS has increased with the occurrence of the 1997 Cariaco Earthquake. In this work, we make an overview of the acquisition methodologies, data processing and contributions to the understanding of local and regional geodynamics. We show the significant contributions from the group headed by the Simón Bolívar University, and FUNVISIS team, in scientific collaboration with researchers of Savoie University, France, without to forget the significant contributions of other authors. Finally, we evaluate the future perspectives: modeling of faults (minor faults) from GNSS observations, densification of present-day networks, installation of continuous GNSS networks , exchange of data with researchers from neighboring countries and definitely, the efforts directed to conformation of the national pool of GNSS equipment available to the whole Venezuelan scientific community involved in this subject.
A sedimentary archive corresponding to the last 17 cal kyr BP has been studied by means of a gian... more A sedimentary archive corresponding to the last 17 cal kyr BP has been studied by means of a giant piston core retrieved on board R/V MARION-DUFRESNE in the North Central Gulf of Corinth. Based on previous methodological improvements, grain-size distribution and Magnetic Susceptibility Anisotropy (MSA) have been analysed in order to detect earthquake-induced deposits. We indentified 36 specific layers -Homogenites+Turbidites (HmTu) - intercalated within continuous hemipelagictype sediments (biogenic or bio-induced fraction and fine-grained siliciclastic fraction). The whole succession is divided into a non-marine lower half and a marine upper half. The “events” are distributed through the entire core and they are composed of two terms: a coarse-grained lower term and an upper homogeneous fine-grained term, sharply separated. Their average time recurrence interval could be estimated for the entire MD01-2477 core. The non-marine and the marine sections yielded close estimated values f...
A sedimentary archive corresponding to the last 17 cal kyr BP has been studied by means of a gian... more A sedimentary archive corresponding to the last 17 cal kyr BP has been studied by means of a giant piston core retrieved on board R/V MARION-DUFRESNE in the North Central Gulf of Corinth. Based on previous methodological improvements, grain-size distribution and Magnetic Susceptibility Anisotropy (MSA) have been analysed in order to detect earthquake-induced deposits. We indentified 36 specific layers -Homogenites+Turbidites (HmTu) - intercalated within continuous hemipelagictype sediments (biogenic or bio-induced fraction and fine-grained siliciclastic fraction). The whole succession is divided into a non-marine lower half and a marine upper half. The “events” are distributed through the entire core and they are composed of two terms: a coarse-grained lower term and an upper homogeneous fine-grained term, sharply separated. Their average time recurrence interval could be estimated for the entire MD01-2477 core. The non-marine and the marine sections yielded close estimated values f...
The north-western Alps foreland is considered as still experiencing distal effects of Alpine coll... more The north-western Alps foreland is considered as still experiencing distal effects of Alpine collision, resulting in both horizontal and vertical relative displacements. Based on seismological and geodetic surveys, detailed patterns of active faulting (including subsurface décollements, blind ramps and deeper crustal thrusts have been proposed (Thouvenot et al., 1998), underlining the importance of NW–SE left-lateral strike-slip offsets as along the Vuache and Culoz faults (cf. the 1996 Epagny event: M=5.4; Thouvenot et al., 1998 and the 1822 Culoz event I=VII-VIII; Vogt, 1979). In parallel to this tectonic evolution, the last glaciation-deglaciation cycles contributed to develop large and over-deepened lacustrine basins, such as Lake Le Bourget (Perrier, 1980). The fine grain, post LGM (ie post 18 ky), sedimentary infill gives a good opportunity to evidence late quaternary tectonic deformations. This study focuses on the Culoz fault, extending from the Jura to the West, to the Chau...
In January 2006, 76 high-resolution reflection seismic profiles were acquired in the Gulf of Cari... more In January 2006, 76 high-resolution reflection seismic profiles were acquired in the Gulf of Cariaco, Northeast Venezuela. In the upper 100 m of sedimentary infill, 17 unconformity-bounded sequences were identified and mapped throughout the basin. Up to now, no core or borehole information is available to provide age constraints on these units. The sedimentary infill is cut by several faults,
Eduardo CARRILLO (1), Franck AUDEMARD (2), Christian BECK (3) and Michel COUSIN (3) ... (1) Univ.... more Eduardo CARRILLO (1), Franck AUDEMARD (2), Christian BECK (3) and Michel COUSIN (3) ... (1) Univ. Central de Venezuela, Fac. de Ciencias, Inst. Ciencias de la Tierra. (ecarrill@gea.ciens.ucv.ve) ... (2) Fundación Venezolana de Investigaciones ...
... par Hubert ARNAUD i, Annie ARNAUD-VANNEAU i, Luc Georges BULOT 2, Christian BECK 3, Oliver MA... more ... par Hubert ARNAUD i, Annie ARNAUD-VANNEAU i, Luc Georges BULOT 2, Christian BECK 3, Oliver MACSOTAY 4, Jean-François STEPHAN 5 et Victor ... Comme l'avait indiqué Rosales [1959], pour les géologues de l'époque tous les calcaires massifs situés au-dessous de la ...
Asf Association Des Sedimentologistes Francais, 2001
La vallee de la Basse Moulouya s'etend du Rif oriental jusqu'a la frontiere algerienne et... more La vallee de la Basse Moulouya s'etend du Rif oriental jusqu'a la frontiere algerienne et est caracterisee par un climat semi-aride. Cette vallee est etroite avec un chenal sinueux et encaisse dont la pente moyenne est de 0,02 %. Dans ses 25 derniers km, a l'est de la terminaison orientale des Kebdana, la Moulouya a depose pendant l'Holocene des alluvions Epaisses (jusqu'a 15m) formant actuellement une terrasse T1 bien marquee dans le paysage. En amont, a Garma, la surface de la T1 est subdivisee en deux niveaux T1 et T2: l'escarpement topographique, haut de 2,5 m et long de 100 m, est oriente transversalement par rapport a l'axe de la Moulouya. Les sediments fluviatiles sont sableux a facies de type barre et silto-agileux a facies de type plaine d'inondation. Ils renferment des indices multiples de deformation syn- et postsedimentaire (seismites, failles et diaclases) qui montrent la continuite de l'activite tectonique a l'Holocene dans ce secteur et permettent d'en preciser la chronologie et d'en quantifier les effets: - incision de la Moulouya, pouvant atteindre 15m, dans les depots de la T1; - niveau a sels (halite, gypse) marquant une transgression marine vers 5 ka BP et souleve de 11,5 m a 20 km du littoral (exhaussement moyen: 2,3 mm.an-1); - structures de fluage et liquefaction, fractures cosismiques anterieures et posterieures a 5 ka BP; - sols interstratifies marquant des arrets de sedimentation; - faille decalant la surface de la T1 de 2 m.
ABSTRACT Analysis of sediments and morpho-structural elements of the last 25 km of the lower Moul... more ABSTRACT Analysis of sediments and morpho-structural elements of the last 25 km of the lower Moulouya valley has shown that this river evolved during the middle and upper Holocene in a tectonic context of uplift, at the South-Eastern end of the Kebdana Mountains. This geodynamic context limited the sedimentation and inhibited the formation of a delta on the Mediterranean shore. A brief sedimentary episode allowed about 10 m of sediments to be deposited, forming a well-marked alluvial terrace. The sedimentation appeared before 3,750 years cal BC in connection with the Holocene sea transgression (“Mellahian” period) and a probably more humid period. It developed at an average rate of 0.6 mm.a–1, five kilometres from the shoreline, before stopping just after 395 years cal BC, at the same time as the post- Mellahian regression. The sediments show evidence of syn- and post-sedimentary seismic activity (seismites, diaclases, faults). They also show some traces of the “Mellahian” transgression (beds containing halite and gypsum) which indicate an average rise of 2.0 mm.a–1 since about 3,700 years cal BC, 22 km from the Moulouya mouth. The sediment composition indicates a subarid climate during the Holocene, but does not enable possible climatic variations to be detected.
... Congrès 8e congrès français de sédimentologie : ( Orléans, 12-14 novembre 2001, livres desrés... more ... Congrès 8e congrès français de sédimentologie : ( Orléans, 12-14 novembre 2001, livres desrésumés et des excursions ) Congrès français de sédimentologie N o 8, Orléans , FRANCE (12/11/2001) 2001 , n o 37[Note(s) : XIX, 375 ; 77 p., ] (2 ref.) ISBN 2-907205-35-8 ; 2 ...
ABSTRACT A giant RV Marion Dufresne piston core MD01-2425 recovered from the 1276 m-deep Çınarcık... more ABSTRACT A giant RV Marion Dufresne piston core MD01-2425 recovered from the 1276 m-deep Çınarcık Basin of the Sea of Marmara documents characteristics of deep basin sedimentation influenced by large-scale gravity-controlled mass-wasting processes and associated turbidite deposition during the Late Pleistocene to Holocene. A visual lithological description of the core reveals twenty major seismoturbidite layers (> 20 cm thick), intercalated in hemipelagic-type fine-grained calcareous and slightly siliceous clays. The thickness and frequency of the sesimoturbidite layers deposited during the lacustrine period (prior to 12.3 cal ka BP) is much greater than during the Holocene marine period. The sedimentary processes during deposition of seismoturbidites in the basin have been determined in this study using a combination of grain-size parameters. Often the seismoturbidites show strong grain segregation with a sharp boundary between a coarse lower and a homogeneous upper part. The traction carpet deposits formed at the base of a turbulent suspension and were produced in the lower coarse-grained part, whereas the homogeneous upper part was deposited by uniform suspensions following bedload deposition.
In 1988, the history of GNSS geodetic measurements with the goal of studying fault kinematics in ... more In 1988, the history of GNSS geodetic measurements with the goal of studying fault kinematics in Venezuela begins with one of the first civil efforts, the Central and South America (CASA) Project. Since then, and for more than two decades now, several authors have been contributing with the ultimate target: To determine slip rates of plate boundary faults in order to understand the active tectonics at the Caribbean South America plate interactions. Recently, the interest on kinematics GNSS has increased with the occurrence of the 1997 Cariaco Earthquake. In this work, we make an overview of the acquisition methodologies, data processing and contributions to the understanding of local and regional geodynamics. We show the significant contributions from the group headed by the Simón Bolívar University, and FUNVISIS team, in scientific collaboration with researchers of Savoie University, France, without to forget the significant contributions of other authors. Finally, we evaluate the future perspectives: modeling of faults (minor faults) from GNSS observations, densification of present-day networks, installation of continuous GNSS networks , exchange of data with researchers from neighboring countries and definitely, the efforts directed to conformation of the national pool of GNSS equipment available to the whole Venezuelan scientific community involved in this subject.
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