Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
The East Sayan ranges are a key area to understand the interactions between the transpressive deformation linked to the far-field effects of the India-Asia collision and the extension linked to the opening of the Baikal Rift System. The active deformation that affects this range is very recent (around 5 Ma) but occurs in a very complex morphotectonic setting and the understanding of the Tertiary deformation relies entirely on a detailed knowledge of the pre-deformation situation. Using apatite fission track thermochronology, cosmogenic 10Be and morphological study on Tertiary lava flows we demonstrate that prior to the Oligocene the morphology of the East Sayan area was characterized by a wide, constantly rejuvenated erosion surface. Apatite fission track thermal modelling indicates that this surface started to form at least in Late Jurassic-Early Cretaceous (140-120 Ma). The long-term exhumation rates (several tens of million years) derived from apatite fission track data (17.5 m/Ma) and the short-term erosion rates (over a few hundred thousand years) derived from cosmogenic 10Be data (12-20 m/Ma) are coherent implying a near constant mean erosion rate since Late Jurassic. This constant, slow erosion prevented the formation of a lateritic-kaolinic weathering crust on the planation surface. By Oligocene-early Miocene times a long wavelength uplift that remains to be explained, induced incision that created shallow valleys later filled by basaltic lava flows. Finally, the present short-wavelength topography initiated during the Pliocene.
ISSN: 0743-9547

insu-00805603
https://hal-insu.archives-ouvertes.fr/insu-00805603
DOI : 10.1016/j.jseaes.2011.09.017

Éditeur(s) : HAL CCSD American Geophysical Union (AGU)
Résumé : International audience
Apatite fission track analysis (AFTA) data are used to bring new light on the long-term and recent history of the Baikal rift region (Siberia). We describe the evolution of the topography along a NW-SE profile from the Siberian platform to the Barguzin range across the Baikal-southern Patom range and the northern termination of Lake Baikal. Our results show that the Baikal-Patom range started to form in the Early Carboniferous and was reactivated in Middle Jurassic-Lower Cretaceous times during the orogenic collapse of the Mongol-Okhotsk belt. Samples located in the Siberian platform recorded a continuous sedimentation up to the early Carboniferous but remain unaffected by later tectonic episodes. The Barguzin basin probably started to form as early as Late Cretaceous, suggesting a continuum of deformation between the postorogenic collapse and the opening of the Baikal Rift System (BRS). The initial driving mechanism for the opening of the BRS is thus independent from the India-Asia collision. AFTA show a late Miocene-early Pliocene increase in tectonic extension in the BRS that confirms previous thoughts and might reflect the first significant effect of the stress field generated by the India-Asia collision.
ISSN: 0278-7407

hal-00420895
https://hal.archives-ouvertes.fr/hal-00420895
DOI : 10.1029/2008TC002404

Éditeur(s) : HAL CCSD
Résumé : International audience
Compilation of new and published apatite fission track data along atransect of the west-central Pyrenees shows that exhumation across thePartial Annealing Zone (~120–60°C) started during the mid Eocene inthe North-Pyrenean Zone and migrated southward to reach the southernedge of the Axial Zone during the early Miocene. An early Miocene stageof exhumation is also detected in the northern part of the Axial Zone,indicating a late pop-up thrust reactivation of the Axial Zone.
La compilación de datos nuevos y pre-existentes de huellas de fisión enapatito a lo largo de un perfil de los Pirineos centro-occidentales muestra quela exhumación a través de la Partial Annealing Zone (~120–60°C) comenzó enel Eoceno medio en la Zona Norpirenaica, y fue migrando hacia el sur hastaalcanzar el borde meridional de la Zona Axial en el Mioceno inferior. Al nortede la Zona Axial se registra así mismo una marcada exhumación durante el Miocenoinferior, indicando una reactivación cabalgante en pop-up de la Zona Axial.
Geogaceta

Droits : info:eu-repo/semantics/OpenAccess
insu-01425009
https://hal-insu.archives-ouvertes.fr/insu-01425009
https://hal-insu.archives-ouvertes.fr/insu-01425009/document
https://hal-insu.archives-ouvertes.fr/insu-01425009/file/PL03665.pdf

Éditeur(s) : HAL CCSD American Geophysical Union (AGU)
Résumé : International audience
This paper presents a new balanced structural cross-section of the Jaca thrust-sheet-top basin of the southern Pyrenees combined with paleo-thermometry and apatite fission track (AFT) thermochronology data. The cross-section, based on field data and interpretation of industrial seismic reflection profiles, allows refinement of previous interpretations of the south-directed thrust system, involving the identification of new thrust faults, and of the kinematic relationships between basement and cover thrusts from the middle Eocene to the early Miocene. AFT analysis shows a southward decrease in the level of fission track resetting, from totally reset Paleozoic rocks and lower Eocene turbidites (indicative of heating to Tmax > ~120 °C), to partially reset middle Eocene turbidites and no/very weak resetting in the upper Eocene-lower Oligocene molasse (Tmax < ~60 °C). AFT results indicate a late Oligocene-early Miocene cooling event throughout the Axial Zone and Jaca Basin. Paleo-maximum temperatures determined by vitrinite reflectance measurements and Raman spectroscopy of carbonaceous material reach up to ~240 °C at the base of the turbidite succession. Inverse modelling of AFT and vitrinite reflectance data with the QTQt software for key samples show compatibility between vitrinite-derived Tmax and the AFT reset level for most of the samples. However, they also suggest that the highest temperatures determined in the lowermost turbidites correspond to a thermal anomaly rather than burial heating, possibly due to fluid circulation during thrust activity. From these results, we propose a new sequential restoration of the south Pyrenean thrust system propagation and related basin evolution.
ISSN: 0278-7407

insu-01312746
https://hal-insu.archives-ouvertes.fr/insu-01312746
https://hal-insu.archives-ouvertes.fr/insu-01312746/document
https://hal-insu.archives-ouvertes.fr/insu-01312746/file/Labaume_et_al-2016-Tectonics.pdf
DOI : 10.1002/2016TC004192

Éditeur(s) : Université des Antilles Études caribéennes
Résumé : Les vacances peuvent-elles durer, voire s’éterniser ? L’utopie est l’une des voies qui permet de penser cette option, d’opérer ce pas de côté, à contre-courant de l’ordre ambiant et dominant. De Segalen à Cendrars, l’épreuve du voyage et de l’exotisme sans voyeurisme porte en elle les preuves du trip ou de l’acte de bourlinguer. Autonomie et nomadisme sont les termes appropriés qui ouvrent et parfois forcent les portes du consensus, de l’immobilisme et de la peur généralisée. Ces deux termes — à l’origine de celui j’ai nommé « autonomadie » (terme assez intraduisible) — renvoient à l’indépendance d’esprit, à la liberté d’expression et à la libre circulation des idées, des personnes, bien avant celle des marchandises. Si la planète constitue le socle de tout voyage, la culture en est son moteur. Cet article s’attelle à baliser de nouvelles pistes de voyages, hors des sentiers battus, nourris par l’imaginaire des ailleurs, et forcément alternatifs. Il s’agit toujours, hier comme aujourd’hui, de s’élever pour mieux se lever, et donc de ne pas tomber et crever. Surtout en si bon chemin d’une belle vie prometteuse qui mène à soi comme vers les autres. L’humanité n’est rien sans la liberté de mouvement. Elle n’est rien sans le mouvement et la liberté. Les humains ne sont pas des automates soumis, mais des nomades autonomes. Et des voyageurs actifs plutôt que des touristes passifs. C’est ce que cette contribution entend non pas affirmer, mais explorer.
Can holidays last or even go on forever? Utopia is one of the ways to think this option, to operate this step aside, against the current of the surrounding and dominant order. From Segalen to Cendrars, the test of travel and exoticism without voyeurism carries in it the proofs of the trip or the act of slinging. Autonomy and nomadism are the appropriate terms that open and sometimes force the doors of consensus, immobilism and generalized fear. These two terms - at the origin of which I named “autonomadie” (in French, quite untranslatable) - refer to independence of mind, freedom of expression and the free flow of ideas, people, long before that of goods. If the planet is the foundation of all travel, culture is its driving force. This article tries to mark new paths of travel, off the beaten track, nourished by the imagination of elsewhere, and necessarily alternative. Yesterday as today, it is always a matter of rising to better stand up, and therefore not to fall and die. Especially in this good way of a beautiful promising life that leads to oneself as to the others. Humanity is nothing without freedom of movement. It is nothing without movement and freedom. Humans are not automated subjects but autonomous nomads. And active travelers rather than passive tourists. This is what this contribution intends not to affirm but to explore.

Droits : info:eu-repo/semantics/openAccess
urn:doi:10.4000/etudescaribeennes.11151
http://journals.openedition.org/etudescaribeennes/11151

Éditeur(s) : Neidine Editeurs
Résumé : This article has for objective to put forward the ethical values of the sea and the ocean. After a reminder(abs of the marine origin of life on earth and what the human always carries in him tracks of this origin, we underline several characteristics: the regulation of the climate by the ocean, the specificities of part of the animal kingdom which unlike other did not conquer the terrestrial domain, the fact that marine biological material was at the origin of numerous Nobel prizes, finally which the sea holds number of biological, mineral, energy resources etc. which will be the resources of tomorrow. The following part is dedicated to the human values which the sea inculcates to those who frequent her. We offer a list of some current expressions of the French language the origin of which is marine or maritime. We discuss then about prosperous nations, sometimes small ones, which knew how to put forward the values of the sea and benefit from it for their influence. We talk about the symbols pulled by the sea, in particular the shells and their value, which various civilizations and peoples have known to adopt. We end on the New Caledonian case and on the opportunities and the assets which can be, considering its marine and maritime values as an island Pacific country.
Cet article a pour objectif de mettre en avant les valeurs éthiques de la mer et de l’océan. Après un rappel de l’origine marine de la vie sur terre et du fait que l’homme porte toujours en lui des traces de cette origine, on souligne plusieurs caractéristiques : la régulation du climat par l’océan, les spécificités de certains embranchements du règne animal qui à la différence d’autres n’ont pas conquis le domaine terrestre, le fait que matériel biologique marin a été à l’origine de nombreux prix Nobel, enfin que la mer recèle nombre de ressources biologiques, minérales, énergétiques etc… qui seront les ressources de demain. La partie suivante est consacrée aux valeurs humaines que la mer inculque à ceux qui la fréquentent. On offre une liste d’expressions courantes de la langue française dont l’origine est marine ou maritime. On discute ensuite des nations florissantes, parfois petites, qui ont su mettre en avant les valeurs de la mer et en tirer profit pour leur rayonnement. On disserte sur les symboles tirés de la mer et notamment des coquillages et de leur valeur que différentes civilisations et peuples ont su adopter. On conclue sur le cas calédonien et sur les opportunités et atouts qui peuvent être les siens de considérer ses valeurs marines et maritimes en tant que pays insulaire du Pacifique.
Tai Kona (2269-7535) (Neidine Editeurs), 2014-07 , N. 9 , P. 28-43

Droits : Tai Kona
http://archimer.ifremer.fr/doc/00203/31393/29782.pdf
http://archimer.ifremer.fr/doc/00203/31393/

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
The high proportion of crystallized apatite forming the bones and teeth should theoretically allow the use of fission track analysis to date vertebrate fossils when burying of the fossiliferous series did not subject them to temperatures exceeding 60 degrees C. However several major obstacles arise such as the complexity of fossils' internal structures, diagenetic modifications and substitutions of the hydroxyapatite by other minerals, and massive U uptake or loss during diagenesis. In this work, those various problems are addressed combining optical microscope observation of the fossils, a systematic fission track analysis of the best samples, alpha and gamma spectrometry and Secondary Ion Mass Spectrometry. Even if the problems caused by internal structures and mineral substitutions can be solved, U movements in and out of the fossils are generally too complex to allow fission track analysis dating of the fossils.
ISSN: 0009-2541

hal-00411880
https://hal.archives-ouvertes.fr/hal-00411880
DOI : 10.1016/j.chemgeo.2007.10.009

Éditeur(s) : Elsevier
Résumé : The ability of captive-reared turtles to survive in the wild is not precisely known, nor are movements of immature turtles in the open ocean. To provide information on these issues, a satellite tracking experiment was conducted in the western Indian Ocean to monitor oceanic movements of immature green turtles. Two wild turtles and four captive-reared individuals were tracked. The latter had been displaced after birth from nesting sites to a distant rearing site. Wild turtles survived after release, but did not move far away from release site. We hypothesize that this resident behaviour may be explained by stage-specific habitat requirements. Captive-reared turtles survived after release and migrated over thousands of kilometres. Among these, the oldest immature turtles retrieved the foraging sites of their native population, with movement patterns similar to those displayed by adults. Observed movements may be linked to hydrographic conditions such as general oceanic circulation, sea temperature and thermal fronts. (C) 2003 Editions scientifiques et medicales Elsevier SAS and Ifremer/IRD/Inra/Cemagref. All rights reserved.
Aquatic Living Resources (0990-7440) (Elsevier), 2003 , Vol. 16 , N. 1 , P. 35-41

Droits : 2003 Ifremer/IRD/Inra/Cemagref. Published by Elsevier, Paris
http://archimer.ifremer.fr/doc/2003/publication-573.pdf
DOI:10.1016/S0990-7440(03)00005-6
http://archimer.ifremer.fr/doc/00000/573/

Éditeur(s) : American Geophysical Union
Résumé : [1] Extreme weather events such as tropical cyclones are difficult to observe with conventional means. Satellite-based observations provide essential measurements of key parameters governing tropical cyclones. They are critical for short-term forecasting. Radiometers onboard the Defense Meteorological Satellite Program satellite series, WindSat and Tropical Rainfall Measuring Mission satellites, scatterometers onboard the ERS, ADEOS, and QuikScat satellites offer unprecedented synoptic observations of surface wind and atmospheric liquid water content, revealing the storm structures with good accuracy. However, satellite estimates do not provide direct measurements of geophysical parameters and can suffer from limitations linked to the sensors characteristics, such as the signal wavelength and polarization or the measurement incidence angle. For example, measurements at Ku band are strongly affected by rain. Still, each observing system can offer specific information that can be combined with the others. In particular, we highlight the capabilities of dual-frequency altimeter to provide very high resolution measurements of rain rate, surface wind speed, and wave characteristics. A method is proposed to obtain continuous along-track 5 km resolution measurements of these parameters in the tropical cyclone Isabel. The results shows that dual-frequency altimeters can provide useful information to complement and validate the operational fields provided by the atmospheric numerical models and by NOAA observing systems.
Journal of Geophysical Union - Research C - Oceans (0148-0227) (American Geophysical Union), 2006 , Vol. 111 , N. C1 , P. NIL_38-NIL_50

Droits : 2006 American Geophysical Union
http://archimer.ifremer.fr/doc/2006/publication-1033.pdf
DOI:10.1029/2005JC003068
http://archimer.ifremer.fr/doc/00000/1033/

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
In this paper we present a new local remeshing algorithm that is dedicated to the problem of erosion in finite element models whose grid follows the movement of the free surface. The method, which we name Surface Lagrangian Remeshing (SLR), is adapted to 2D Lagrangian models which couple surface erosion with deformation of Earth materials. The remeshing procedure preserves nodes defining the surface submitted to erosion and removes nodes belonging to surface elements whose internal angles or area is critically low. This algorithm is ideally suited to track long term surface evolution. To validate the method we perform a set of numerical tests, using triangular finite elements, which compare the results obtained with the SLR algorithm with global remeshing and with analytical results. The results show good agreements with analytical solutions. Interpolation errors associated with remeshing are generated locally and numerical diffusion is restricted to the remeshed domain itself. In addition this method is computationally costless compared to classical global remeshing algorithm. We propose to couple the SLR method with the Dynamical Lagrangian Remeshing (DLR) algorithm to enable local remeshing only of Lagrangian models coupling large deformation of Earth materials with large erosion.
ISSN: 0098-3004

hal-00639472
https://hal.archives-ouvertes.fr/hal-00639472
DOI : 10.1016/j.cageo.2010.05.023

Éditeur(s) : HAL CCSD
Résumé : International audience
In this paper, we describe a blood alcohol content estimation prototype based on a comportment analysis performed by artificial neural networks. We asked to subjects that had drunk alcohol to play a video-game after having measured their blood alcohol content with a breathalyser. A racing game was modified so that it could provide various data related to the use of the controls by the player. Using the collected data, we trained our neural network in order to be able to determine whether or not the subject had exceeded a blood alcohol content threshold. We also succeeded in estimating this blood alcohol content with a mean error of 0.1g/l. We could perform those estimations independently of the track played among the two ones used. It was also performed in "real time", e.g., using only the data collected within the last 10 seconds of playing.
Proceedings of the 2011 International Conference on Advances in Computer-Human Interactions
Gosier, Guadeloupe

Droits : info:eu-repo/semantics/OpenAccess
hal-00849971
https://hal.archives-ouvertes.fr/hal-00849971
https://hal.archives-ouvertes.fr/hal-00849971/document
https://hal.archives-ouvertes.fr/hal-00849971/file/article.pdf

Éditeur(s) : HAL CCSD Wiley-Blackwell
Résumé : International audience
Lawsonite pseudomorphs are used to identify and distinguish the kinematic records of subduction and exhumation in blueschist-facies rocks from Syros (Cyclades; Greece). Lawsonite is a hydrous mineral that crystallizes at high-pressure and low-temperature conditions. During decompression, lawsonite is typically pseudomorphed by an aggregate dominated by epidote and paragonite. Such aggregates are easily deformable and if deformation occurs after the lawsonite breakdown, the pseudomorphs are difficult to distinguish from the matrix. The preservation of the lawsonite crystal shape, despite complete retrogression, indicates therefore that the host blueschist rock has not been affected by penetrative deformation during exhumation, thus providing indication of strain-free conditions. Therefore, tracking the lawsonite growth and destabilization along the P-T path followed by the rocks during a subduction/exhumation cycle provides information about the subduction/exhumation-related deformation. Using microstructural observations and P-T pseudosections calculated with thermocalc, it is inferred that top-to-the-south sense of shear preserved in lawsonite pseudomorph-bearing blueschists on Syros occurred during the prograde metamorphic path within the lawsonite stability field, and is therefore associated with subduction. On the contrary, the deformation with a top-to-the-north sense of shear is observed in surrounding rocks, where lawsonite pseudomorphs are deformed or apparently lacking. This deformation occurred after the lawsonite breakdown during exhumation. At the regional scale, exhumation-related deformation is heterogeneous, allowing the preservation of lawsonite pseudomorphs in significant volumes of blueschists of the central and southern Cyclades. It is argued that such successive shearing deformation events with opposite senses more likely correspond to an exhumation process driven by slab rollback, in which subduction and exhumation are not synchronous
ISSN: 0263-4929

insu-00841214
https://hal-insu.archives-ouvertes.fr/insu-00841214
DOI : 10.1111/jmg.12035

Éditeur(s) : Edp Sciences S A
Résumé : Sperm characteristics of scallops have not been well described in the scientific literature. The effects of sperm release technique (thermal shock versus serotonin injection), of sperm collection technique (testis sampling versus serotonin injection), of sperm sampling location along the genital tract, of in vitro sperm maturation, and of time post activation on scallop sperm characteristics were assessed in the present work. Whatever sperm release technique used, no significant differences were observed regarding the percentage of motile spermatozoa and the velocity of the average path (YAP). Compared to testicular sperm, a higher percentage of motile spermatozoa, YAP and intracellular adenosine triphosphate (ATP) content were observed for sperm shed after serotonin injection. From the distal part of testes up to the gonopore, an increase of the percentage of motile spermatozoa and YAP was assessed, suggesting a sperm 'maturation process' along the genital ducts. A higher increase in the percentage of motile sperm was recorded during a 5 mm incubation of testicular sperm in seawater containing 2 mM serotonin and seawater containing 10 mM caffein compared to seawater (control). In addition, a higher YAP was assessed, incubating testicular sperm in caffein, compared to control or serotonin. Then, the percentage of motile spermatozoa, YAP and intracellular ATP content exhibited a progressive reduction during the 10 h swimming period. Mean values of the percentage of motile spermatozoa, YAP, sperm track linearity (LIN) and intracellular ATP content recorded at the beginning of the movement period for sperm samples collected after intragonadal serotonin injection, were 82 +/- 7%, 162 +/- 15 mu m s(-1), 0.33 +/- 0.12 and 212 +/- 133 nmol x 10(-9) spermatozoa (n = 9 males), respectively. The present study confirms the existence of a sperm "maturation process" along scallop genital ducts. In addition, the cessation of scallop sperm movement can be explained by the exhaustion of ATP content at the end of the movement phase.
Aquatic Living Resources (0990-7440) (Edp Sciences S A), 2013-07 , Vol. 26 , N. 3 , P. 215-220

Droits : EDP Sciences, IFREMER, IRD 2013
http://archimer.ifremer.fr/doc/00157/26852/24983.pdf
DOI:10.1051/alr/2013048
http://archimer.ifremer.fr/doc/00157/26852/

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
The Dien Bien Phu (DBP) Fault strikes nearly perpendicular to the general tectonic framework, separating northwest Vietnam into two compartments. The DBP and Muong Lay granites are exposed respectively east and west of the fault. The U/Pb age of 277 ± 2 Ma obtained for the Muong Lay granite is similar to the age of the Chieng Khuong complex exposed within the Song Ma structure east of the DBP Fault. These two magmatic intrusions are considered as belonging to a same tectonic structure related to the subduction of the Song Ma Ocean under the Indochina Block during the Indosinian orogeny. The DBP Fault with a total post Permian dextral offset of 30-40 km shifts the Song Ma Suture. It could then be connected to the Ailao Shan-Shuanggou suture to the north. The undeformed DBP granite gave a U/Pb age of 230 ± 1 Ma sealing the Indosinian deformation on the fault. The Ladinian-Carnian activity of the fault is confirmed by the 40Ar/39Ar (biotite) age of 228 ± 4 Ma obtained from the paragneiss forming the fault zone. A geodynamic model is proposed to describe the various tectonic phases recorded by on the DBP Fault. It associates field data, stratigraphic observations, and geochronology analyses (U/Pb, Ar/Ar, fission tracks). Following the Late Triassic exhumation of the granite and the end of the Indosinian orogeny marked by the Norian unconformity, the granite was buried under Jurassic and Lower Cretaceous sediments. A strong cooling event during the early Late Cretaceous (100 Ma) is associated with the reactivation of the DBP Fault and the accommodation of a southward thrusting of the Song Da terrane onto the Truong Son Belt. This newly recognised tectonic phase could be associated to the subduction of the Paleo-Pacific plate under the Indochina Block. No data are available yet to constrain the Tertiary evolution of the DBP system. However, the Tertiary deformation is likely similar to the Cretaceous one.
ISSN: 1342-937X

insu-01015379
https://hal-insu.archives-ouvertes.fr/insu-01015379
DOI : 10.1016/j.gr.2013.07.018

Éditeur(s) : Inter-Research
Résumé : We studied the foraging rhythms of green sea turtles Chelonia mydas on the seagrass beds of N'Gouja Bay, Mayotte Island (Comoros Archipelago) with acoustic transmitters and moored listening stations. We monitored 8 tagged turtles (4 probable males, 3 probable females and 1 immature), from 70 to 109 cm curved carapace length (CCL), for durations ranging from 5 to 92 d. The turtles exhibited a regular diel pattern: they foraged mainly during the day (on average 87% of seagrass detections were between 06:00 and 18:00 h) and rested on the inner reef slope during the night. Night time feeding activities were observed on the seagrass bed when the night light was high. The presence of turtles on the seagrass bed at night was significantly correlated with a night light index (r = 0.54, p = 0.002), which included both moon light and cloudiness indices. Behaviour of the only immature individual observed was similar to adult turtles, although it rested more frequently around noon. All turtles displayed a high fidelity to 1 foraging site within the seagrass bed. Acoustic transmitters and permanent listening stations are an appropriate technique for long-term behavioural studies of turtles, with no human interaction with turtles during tracking, and represent a suitable technique to assess the possible effects of environmental changes or human activities upon green turtle behaviour.
Marine Ecology Progress Series (0171-8630) (Inter-Research), 2006 , Vol. 306 , P. 295-302

Droits : Inter-Research 2006
http://archimer.ifremer.fr/doc/2006/publication-3616.pdf
DOI:10.3354/meps306295
http://archimer.ifremer.fr/doc/00000/3616/

Éditeur(s) : HAL CCSD Elsevier Masson
Résumé : The Great Glen Fault (GGF) is a major lithospheric strike-slip fault system that cuts across the Caledonian orogenic belt of Scotland. It separates the Northern Highlands terrane from the Grampian terrane. Movement history along the fault extends at least into the Early Palaeozoic. The low-temperature history of the Scottish Highlands covers a significant period from the Late Palaeozoic to the Present, but the magnitude of vertical movements that affected the GGF area during that time is still a matter of debate. Fission track analysis on detailed vertical profiles in the Ballachulish and Strontian complexes, as well as on a profile oriented northeastwards across the GGF, reveals distributed differential vertical movements along the fault during the Late Palaeozoic. The Mesozoic denudation is estimated at a maximum of 2 km before a more recent widespread exhumation event that started at around 40–25 Ma, leading to 1.6 to 2 km of erosion. La Great Glen Fault (GGF) est un système décrochant lithosphérique majeur qui traverse la chaîne calédonienne d'Écosse. Il sépare les domaines des Northern Highlands et de Grampian. L'histoire tectonique de ce système remonte au moins au Paléozoïque inférieur. L'histoire de la dénudation des Highlands d'Écosse s'étend du Paléozoïque supérieur jusqu'au Présent, mais l'ampleur des mouvements verticaux ayant affecté la zone autour du système de la GGF pendant cette période est toujours sujette à débat. Les analyses traces de fission réalisées sur des profils verticaux dans les complexes granitiques du Ballachulish et de Strontian, ainsi que sur un profil plus au nord-est à travers la GGF, mettent en évidence des mouvements différentiels distribués de part et d'autre de la faille au Paléozoïque supérieur. La dénudation mésozoïque est estimée au maximum à 2 km, avant un dernier épisode de surrection généralisée à partir de 40–25 Ma, qui provoque environ 1,6 à 2 km d'érosion.
ISSN: 1631-0713

hal-00406583
https://hal.archives-ouvertes.fr/hal-00406583
DOI : 10.1016/j.crte.2006.12.005

Éditeur(s) : HAL CCSD
Résumé : International audience
The Jaca basin is a thrust-sheet top basin transported southward andunderlain by basement and cover thrusts separated by a Triassic décollement.Basin-fill upper Cretaceous to lower Oligocene synorogenic sequencesrecord a southward depocenter migration, while growth stratadate a shift of deformation from the mid-Eocene in the N to the earlyMiocene in the S (S-Pyrenean front). However, the deep geometry andkinematic relationships between the cover and basement thrusts remainnon-consensual. We present a new structural and kinematic interpretationfor the eastern Jaca basin, based on subsurface structural maps andcross-sections constructed using industrial seismic reflection profiles.Raman Spectroscopy of Carbonaceous Material (RSCM), vitrinite reflectanceand apatite fission track (AFT) thermochronology data givefurther constraints for the restoration of the deformation and burialexhumationsequence. We define 3 main basement thrusts under thenorthern part of the basin, from N to S the Broto, Fiscal and Guargathrusts. The study also clarifies the deep structure of the cover thrustsand their links with these basement thrusts and those located more tothe north in the Axial Zone (AZ), which altogether define the timing ofthe basement thrust sequence as follows : the Lakoura-Eaux Chaudesthrust system (northern AZ) active up to the end Bartonian, the Gavarnie(central AZ) and Broto thrusts during the Priabonian-Rupelian andthe Fiscal and Guarga thrusts during the late Oligocene-early Miocene.AFT results in the basin fill and AZ date the exhumation of the basinto the late Oligocene-early Miocene, in relation to the Fiscal-Guargathrusting. AFT partial reset argues for a maximum burial < 6 km forthe base of the Eocene detrital sequence (Hecho Group turbidites). Bycontrast, RSCM and vitrinite thermometry at the same level indicatesTmax around 180°C, locally up to 240°C, attesting to a temperature anomalypossibly related to transient fluid circulation.
24 ème Réunion des sciences de la Terre 2014
Pau, France

insu-01080836
https://hal-insu.archives-ouvertes.fr/insu-01080836

Éditeur(s) : HAL CCSD Springer Verlag
Résumé : Vertical displacements on the SW-NE T (e) over capt fault (Eastern Pyrenees Axial Zone, France), which separates the Variscan Canigou-Caranca and Mont-Louis massifs, were constrained using a thermochronologic multi-method approach. Ar-40/Ar-39 data from the granitic Mont-Louis massif record its Variscan cooling history and reveal no ages younger than Early Cretaceous, while the Canigou-Caranca gneiss massif records systematically younger Ar-40/Ar-39 ages. These younger Ar-40/Ar-39 ages in the Canigou-Caranca gneiss massif are the result of partial to total rejuvenation of argon isotopic systems related to a thermal flow coeval with the Cretaceous HT-BP metamorphism in the North Pyrenean Zone. Only the deepest rocks from the Canigou-Caranca suffered this extensive Mid-Cretaceous thermal overprint probably due to differential burial around 4 km at that time. The post Mid-Cretaceous vertical displacements along the T (e) over capt fault are recorded by "low" temperature thermochronology using K-feldspar Ar-40/Ar-39, zircon and apatite fission track and (U-Th)/He datings. The Mont-Louis granite samples experienced a long period of protracted cooling reflecting a lack of thermo-tectonic activity in this area from Late Palaeozoic to Early Cenozoic, followed by cooling from 55-60 Ma to Late Eocene at a mean rate of 15-20 degrees C/Ma in the final stage. This cooling stage corresponds to T (e) over capt fault reactivation with a reversed component, promoting exhumation of the Mont-Louis roof zone contemporaneously with the south-vergent Pyrenean thrusting. In the Canigou-Caranca massif, the main cooling event occurred from 32 to 18 Ma at a maximum rate of 30 degrees C/Ma during Early Oligocene followed by a more moderate rate of 3 degrees C/Ma from Late Oligocene to Early Burdigalian, coeval with the normal reactivation of the T (e) over capt fault in brittle conditions that accommodated the final exhumation of the massif during the opening of the Gulf of Lion.
ISSN: 1437-3254

hal-00411442
https://hal.archives-ouvertes.fr/hal-00411442
DOI : 10.1007/s00531-007-0179-x

Éditeur(s) : HAL CCSD Geological Society
Résumé : International audience
We constrain the slip and cooling history of the Mykonos detachment footwall using thermochronometry. A U-Pb zircon age of 13.5 +/- 0.3 Ma dates intrusion of the Mykonos monzogranite. Ar-40/ Ar-39 homblende and biotite ages from the monzogranite are 12.7 +/- 0.6 Ma and 10.9 +/- 0.6 Ma, whereas zircon and apatite fission-track ages range from 13 +/- 0.8 Ma to 10.7 +/- 0.8 Ma and 12.5 +/- 2.2 Ma to 10.5 +/- 1.8 Ma. (U-Th)/He ages range from 13.6 +/- 0.6 Ma to 9.0 +/- 0.7 Ma for zircon and 11. +/- 10.5 Ma to 8.9 +/- 0.4 Ma for apatite. The ages in part overlap within 2 sigma errors and together with the long apatite fission-track lengths (>14 mu m) support rapid cooling at rates > 100 degrees C Ma(-1). The low-temperature thermochronometric ages decrease east-northeastwards in the direction of hanging-wall transport on the Mykonos detachment. Age-distance relationships show that the Mykonos detachment slipped at an average rate of 6.0 + 9.2/-2.4 km Ma(-1) c. 30 km of offset and c. 12 km of exhumation. This result indicates that Miocene low-angle normal faulting was not important for the exhumation of the Cycladic blueschist unit. The opening of the Aegean Sea basin in the Miocene was controlled by a few large-magnitude low-angle normal faults.
ISSN: 0016-7649

hal-00412177
https://hal.archives-ouvertes.fr/hal-00412177
DOI : 10.1144/0016-76492006-145

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
Evidence of the impact of exposure to low levels of lead on children's health is increasing. Residential floor dust is the assumed origin of lead exposure by young children. In this study, we estimate the contribution of different lead sources to household interior floor dust contamination. We also estimate the within-home variability of interior floor dust lead loadings. A multilevel model was developed based on data collected in a French survey in 2008-2009 (484 housing units, 1834 rooms). Missing data were handled by multiple imputation using chained equations. The intra-home correlation between interior floor Log dust lead loadings was approximately 0.6. Dust lead from the landing of an apartment, mostly originating outside the building, was the major contributor to interior floor dust lead. Secondary contributors included the lead-based paint on exterior railings, track-in of the exterior soil of the children's play area into the dwelling, smoking inside the home, demolition of nearby old buildings and sites of pollution in the vicinity. Interior lead-based paint contaminated interior floor dust only in old and non-renovated dwellings. To reduce interior floor dust lead levels in the general population of dwellings, common areas should be maintained, and track-in from the outside should be limited as much as possible.
ISSN: 0048-9697

hal-01017419
https://hal-univ-rennes1.archives-ouvertes.fr/hal-01017419
https://hal-univ-rennes1.archives-ouvertes.fr/hal-01017419/document
https://hal-univ-rennes1.archives-ouvertes.fr/hal-01017419/file/Source_Contribution_final.pdf
DOI : 10.1016/j.scitotenv.2013.10.028