Geops (Geosciences Paris Sud)


Nos tutelles

CNRS

Nos liens

Rechercher




Accueil > Recherche > Productions Scientifiques > Articles dans des revues avec comité de lecture

Articles dans des revues avec comité de lecture : Année 2012

Les reptiles et synapsides fossiles de Bourgogne.

13 juin 2014

L'inventaire actuel des Amniotes (Synapsida et Reptiles) fossiles à partir des collections bourguignonnes est présenté dans l'ordre stratigraphique. Il montre que les Synapsida (Reptiles Mammaliens) sont représentés au Carbonifère et au Permien inférieur par quelques squelettes. Dans le reste du (...)

Lire la suite

Les Amphibiens fossiles de Bourgogne (Temnospondyles et Lissamphibiens).

19 septembre 2013

L'inventaire actuel des Amphibiens fossiles des collections bourguignonnes montre que les Temnospondyles (Branchiosaures, Eryopidés), Lépospondyles (Nectridiens, Aïstopodes) et Discosauridés du Carbonifère et du Permien sont bien représentés ; ainsi que leurs traces de pas. Par contre, les (...)

Lire la suite

Crystallization in organo-mineral micro-domains in the crossed-lamellar layer of Nerita undata (Gastropoda, Neritopsina)

6 juin 2013

Crossed-lamellar shell microstructure consists of a sophisticated arrangement of interspersed lamellae, which is very commonly found in Gastropoda or Bivalvia shell layers. Its smallest constitutive microstructural units are usually described as sub-micrometric fibers, or rods, and form very (...)

Lire la suite

Origin of iron oxide spherules in the banded iron formation of the Bababudan Group, Dharwar Craton, Southern India

5 juin 2013

The banded iron formation of the Bababudan Group (Western Dharwar Craton, India) is composed of millimetric to centimetric alternating quartz and grey to red Fe-oxide bands. Major phases are quartz and martite (hematized magnetite) with minor Fe-sulfides and Ca-Mg-Fe-carbonates. Micrometric (...)

Lire la suite

Structure and composition of the boundary zone between aragonitic crossed lamellar and calcitic prism layers in the shell Concholepas concholepas (Mollusca, Gastropoda)

23 avril 2013

Mollusc shells are composed of two or three layers. The main layers are well-studied, but the structural and chemical changes at their boundaries are usually neglected. A microstructural, mineralogical, and biochemical study of the boundary between the inner crossed lamellar and outer prismatic (...)

Lire la suite

Dynamic topography control on Patagonian relief evolution as inferred from low temperature thermochronology

10 avril 2013

We combine low-temperature thermochronology apatite (U-Th)/He data and semi-analytical modeling of dynamic topography to investigate the role of slab window and climate on cooling/heating history and relief evolution of the Patagonian Cordillera. In particular, we discuss a new (...)

Lire la suite

3D joint inversion modeling of the lithospheric density structure based on gravity, geoid and topography data : application to the Alborz Mountains (Iran) and South Caspian Basin region

11 décembre 2012

We present a 3D algorithm to obtain the density structure of the lithosphere from joint inversion of free air gravity, geoid and topography data based on a Bayesian approach with Gaussian probability density functions. The algorithm delivers the crustal and lithospheric thicknesses and the (...)

Lire la suite

7000 years of paleostorm activity in the NW Mediterranean Sea in response to Holocene climate events

4 décembre 2012

A high-resolution record of paleostorm events along the French Mediterranean coast over the past 7000 years was established from a lagoonal sediment core in the Gulf of Lions. Integrating grain size, faunal analysis, clay mineralogy and geochemistry data with a chronology derived from (...)

Lire la suite

Carbon dioxide, argon, nitrogen and methane clathrate hydrates: Thermodynamic modelling, investigation of their stability in Martian atmospheric conditions and variability of methane trapping

4 décembre 2012

This paper deals with the stability of clahtrate hydrates at low temperature and low pressure in the conditions prevailing in the atmosphere and at the surface of Mars. We fit the classical van der Waals model to compare deviation from experimental results published in the literature. It (...)

Lire la suite

Inferring stress from faulting : from Early concepts to inverse methods

29 novembre 2012

We review the evolution of concepts on and methods of estimating the state of stress from fault movements. Theories of failure in isotropic materials suggested a simple geometrical construction of optimal principal stress directions from a fault plane and its associated slip. These optimal (...)

Lire la suite

Diffusion of HTO, Cl-36(-) and I-125(-) in Upper Toarcian argillite samples from Tournemire: Effects of initial iodide concentration and ionic strength

27 novembre 2012

Diffusion parameters for HTO, 36Cl−, and 125I− were determined on Upper Toarcian argillite samples from the Tournemire Underground Research Laboratory (Aveyron, France) using the through diffusion technique. The direction of diffusion was parallel to the bedding plane. The purpose of the present (...)

Lire la suite

Volatile Trapping in Martian Clathrates

24 novembre 2012

Thermodynamic conditions suggest that clathrates might exist on Mars. Despite observations which show that the dominant condensed phases on the surface of Mars are solid carbon dioxide and water ice, clathrates have been repeatedly proposed to play an important role in the distribution and (...)

Lire la suite

Characterization of hydrated silicate-bearing outcrops in Tyrrhena Terra, Mars: Implications to the alteration history of Mars.

12 novembre 2012

The Tyrrhena Terra region of Mars is studied with the imaging spectrometers OMEGA (Observatoire pour la Minéralogie, l'Eau, les Glaces et l'Activité) onboard Mars Express and CRISM (Compact Reconnaissance Infrared Spectrometer for Mars) onboard Mars Reconnaissance Orbiter, through the observation (...)

Lire la suite

Reconstructing precipitation changes in northeastern Africa during the Quaternary by clay mineralogical and geochemical investigations of Nile deep-sea fan sediments.

12 novembre 2012

Clay mineralogy combined with high-resolution element geochemistry of core MD90-9064, located in the distal part of the Nile deep-sea fan (Levantine Basin), have been investigated to reconstruct rainfall changes in northeastern Africa during the Quaternary and to determine possible climatic (...)

Lire la suite

The origin of coexisting carbonates in banded iron formations : a micro-mineralogical study of the 2.4 Ga Itabira Group, Brazil.

12 novembre 2012

This is the first petrographic and chemical study on the origin of co-existing calcite, dolomite, ankerite and sideroplesite in the 2.4 Ga Itabira Group, Brazil. The Itabira Group hosts silicic and dolomitic BIFs, known as quartz itabirites and carbonate itabirites, which are composed of (...)

Lire la suite

Reconstruction of the Nd isotope composition of seawater on epicontinental seas: testing the potential of Fe-Mn oxyhydroxide coatings on foraminifera tests for deep-time investigations.

26 octobre 2012

The Fe-Mn oxide fraction leached from deep-sea sediments has been increasingly used to reconstruct the Nd isotope composition of deep water masses, that can be used to track changes in oceanic circulation with a high temporal resolution. Application of this archive to reconstruct the Nd isotope (...)

Lire la suite

Origin and dynamics of groundwater salinity in the alluvial plains of the western Dehli and adjacent territories of Haryana State, India

22 octobre 2012

Groundwater salinity is a widespread problem and a challenge to water resources management. It is an increasing concern in the alluvial plains of Delhi and neighbouring Haryana state as well as a risk for agricultural production water supply and sustainable development. This study aims to (...)

Lire la suite

Post-breakup tectonics in southeast Brazil from thermochronological data and combined inverse-forward thermal history modeling

15 octobre 2012

The continental margin of southeast Brazil is elevated. Onshore Tertiary basins and Late Cretaceous/Paleogene intrusions are good evidence for post breakup tectono-magmatic activity. To constrain the impact of post-rift reactivation on the geological history of the area, we carried out a new (...)

Lire la suite

Influence of redox conditions on iodide migration through a deep clay formation (Toarcian argillaceous rock, Tournemire, France)

3 octobre 2012

With a half-life of 15.7 Ma, a high mobility and the potential to accumulate in the biosphere, 129I is considered, in safety assessment calculations for radioactive waste repositories, to be one of the main contributors to the radiological dose. Several authors have reported that, at low (...)

Lire la suite

Structural records of the late Cretaceous-Cenozoic extension in eastearn china and the kinematics of the southern Tan-Lu and Qinling Fault Zone (Anhui and Shaanxi provinces, PR China)

3 octobre 2012

Our study of the Late Cretaceous-Cenozoic extension in Eastern China is a kinematic analysis of faults (≈ 1500 striated fault data, 175 stress solutions at 90 sites) that has permitted us to separate stress fields belonging to six tectonic events. A WNW-ESE extension (1) has affected Eastern (...)

Lire la suite

Volcano-tectonic evolution of the northern part of the Arabian plate in the light of new K-Ar ages and remote sensing : Harrat Ash Shaam volcanic province, Syrie

3 octobre 2012

The Harrat Ash Shaam volcanic province (HASV) is the largest volcanic field in the Arabian plate. It developed during the Cenozoic close to the southern part of Dead Sea fault system and has been linked to the tectonic evolution of the Red Sea rifting since the early Oligocene. The HASV is an (...)

Lire la suite

Reconstruction of the Nd isotope composition of seawater on epicontinental seas : testing the potential of Fe-Mn oxyhydroxide coatings on foraminifera tests for deep-time investigations

3 octobre 2012

The Fe-Mn oxide fraction leached from deep-sea sediments has been increasingly used to reconstruct the Nd isotope composition of deep-water masses, that can be used to track changes in oceanic circulation with a high temporal resolution. Application of this archive to reconstruct the Nd isotope (...)

Lire la suite

Accounting for long alpha-particle stopping distances in (U-Th-Sm)/He geochronology : 3D modeling of diffusion, zoning, implantation and abrasion

19 septembre 2012

In apatite (U-Th)/He thermochronology the helium distribution in a crystal is a function of the simultaneous processes of radiogenic production, thermally activated volume diffusion and the ejection of He caused by long alpha stopping distances. These processes are further complicated by (...)

Lire la suite

In situ distribution and characterization of the organic content of the oyster shell Crassostrea gigas (Mollusca, Bivalvia)

18 septembre 2012

Cultivation of commercial oysters is now facing the possible influence of global change in sea water composition, commonly referred to as "ocean acidification". In order to test the potential consequence of the predicted environmental changes, a cultivation experiment was carried out. The left (...)

Lire la suite

Biogenic calcite granules - are brachiopods different ?

18 septembre 2012

Brachiopods are still one of the least studied groups of organisms in terms of biomineralization despite recent studies indicating the presence of highly complex biomineral structures, particularly in taxa with calcitic shells. Here, we analyze the nanostructure of calcite biominerals, fibres (...)

Lire la suite

In-situ geochemistry of sulfides in highly metasomatized mantle xenoliths from Kerguelen, southern Indian Ocean

27 août 2012

Mantle xenoliths from the Kerguelen Archipelago record a complex multistage history involving a high degree (15 to 25%) partial melting that created a harzburgitic mantle completely stripped of Base Metal Sulfides (BMS), followed by pervasive melt-rock reaction with alkaline melts above the (...)

Lire la suite

Controls on 13C and 14C variability in soil CO2

27 août 2012

14C dating of groundwater depends on the isotopic composition of both the solid carbonate and the soil CO2 and requires the use of 14C age correction models. To better assess the variability of the 14C activity of soil CO2 (A14Csoil-CO2) and the δ13C of soil CO2 (δ13Csoil-CO2), which are two (...)

Lire la suite

Carbon dioxide, argon, nitrogen and methane clathrate hydrates : thermodynamics modeling, investigation of their stability in Martian atmospheric conditions and variability of methane trapping

27 août 2012

This paper deals with the stability of clahtrate hydrates at low temperature and low pressure in the conditions prevailing in the atmosphere and at the surface of Mars. We fit the classical van der Waals model to compare deviation from experimental results published in the literature. It (...)

Lire la suite

Morphological and mechanical characterization of gullies in a periglacial environment : the case of the Russell crater dune (Mars)

24 juillet 2012

Gullies on terrestrial sand dunes are rare, and their presence on Mars, as well as their mechanical properties, and the quantity of fluid required for their formations currently remain poorly understood. This study focuses on gully morphologies on the Russell megadune (54.5°S; 12.7°E) using High (...)

Lire la suite

The ChemCam Instrument Suite on the Mars Science Laboratory (MSL) Rover: Body Unit and Combined System Tests

12 juillet 2012

The ChemCam instrument suite on the Mars Science Laboratory (MSL) rover Curiosity provides remote compositional information using the first laser-induced breakdown spectrometer (LIBS) on a planetary mission, and provides sample texture and morphology data using a remote micro-imager (RMI). (...)

Lire la suite

The WIRCam Deep Survey. I. Counts, colours, and mass-functions derived from near-infrared imaging in the CFHTLS deep fields

5 juillet 2012

We present a new near-infrared imaging survey in the four CFHTLS deep fields: the WIRCam Deep Survey or "WIRDS". WIRDS comprises extremely deep, high quality (FWHM ~ 0.6″) J, H, and Ks imaging covering a total effective area of 2.1 deg2 and reaching AB 50% completeness limits of ≈ 24.5. We (...)

Lire la suite

A two-step process for the reflooding of the Mediterranean after the Messinian Salinity Crisis

2 juillet 2012

The Messinian Salinity Crisis is well known to have resulted from a significant drop of the Mediterranean sea level. Considering both onshore and offshore observations, the subsequent reflooding is generally thought to have been very sudden. We present here offshore seismic evidence from the (...)

Lire la suite

GEOTRACES intercalibration of neodymium isotopes and rare earth element concentrations in seawater and suspended particles. Part 1 : reproductibility of results for the international comparison

29 juin 2012

One of the key activities during the initial phase of the international GEOTRACES program was an extensive international intercalibration effort, to ensure that results for a range of trace elements and isotopes (TEIs) from different cruises and from different laboratories can be compared in a (...)

Lire la suite

Reconstructing the architectural evolution of volcanic islands from combined K/Ar, morphologic, tectonic and magnetic data : the Faial Island example (Azores)

25 juin 2012

The morpho-structural evolution of oceanic islands results from competition between volcano growth and partial destruction by mass-wasting processes. We present here a multi-disciplinary study of the successive stages of development of Faial (Azores) during the last 1 Myr. Using high-resolution (...)

Lire la suite

Sub-kilometre (intra-crater) mounds in Utopia Planifia, Mars : character, occurrence and possible formation hypotheses ?

25 juin 2012

At the middle latitudes of Utopia Planitia (∼35-450 N; ∼65-1010 E) hundreds of small-sized mounds located in sub-kilometre impact craters dot the landscape. Their shape varies from circular to crescentic and their height ranges from ∼10-50 metres. Often, metre to deca-metre pitting is observed, as (...)

Lire la suite

Groundwater residence time downgradient of Trench No. 22 at the Chernobyl Pilot Site: Constraints on hydrogeological aquifer functioning

19 juin 2012

Following the explosion of reactor 4 at the Chernobyl power plant in northern Ukraine in 1986, contaminated soil and vegetation were buried in shallow trenches dug directly on-site in an Aeolian sand deposit. These trenches are sources of radionuclide (RN) pollution. The objective of the (...)

Lire la suite

Miocene to recent alkaline volcanism between Al Haruj and Waw an Namous (southern Libya)

16 juin 2012

Unspiked K-Ar ages, petrological, geochemical and isotopic data are reported on samples from southern Libya (Wan an Namous--Al Haruj area). The Wan an Namous intracaldera cone dated at 0.2 Ma consists of unusually undersaturated foidite, representing the most extreme compositions among Libyan (...)

Lire la suite

Colour or no coulour in the juvenile shell of the black lip pearl oyster, Pinctada margaritifera ?

13 juin 2012

Pinctada margaritifera mollusc is cultivated in French Polynesia for the production of black pearls. For this study, the colour of juvenile samples (48 days old) was investigated in the visible range spectra (430-700 nm) using spectrophotometry. A first measurement was done with the soft parts (...)

Lire la suite

Extra-terrestrial igneous granites and related rocks : a review of their occurrence and petrogenesis

11 juin 2012

The telluric planets and the asteroid belt display the same internal structure with a metallic inner core and a silicate outer shell. Experimental data and petrological evidence in silicate systems show that granite can be produced by extreme igneous differentiation through various types of (...)

Lire la suite

Late Pleistocene to Holocene tephrostratigraphic record from the Northern Ionian Sea.

11 mai 2012

A detailed tephrostratigraphic study supported by stable isotope (δ18O) analyses and AMS 14C dating was carried out on a high sedimentation rate deep-sea core recovered in the northern Ionian Sea. Eight tephra layers were recognised, all originated from explosive eruptions of southern Italian (...)

Lire la suite

210Pb-226Ra chronology reveals rapid growth rate of Madrepora oculata and Lophelia pertusa on world's largest cold-water coral reef

26 avril 2012

Here we show the use of the 210Pb-226Ra excess method to determine the growth rate of two corals from the world's largest known cold-water coral reef, Røst Reef, north of the Arctic circle off Norway. Colonies of each of the two species that build the reef, Lophelia pertusa and Madrepora (...)

Lire la suite

Checking collagen preservation in archaeological bone by non-destructive studies (Micro-CT and IBA)

15 mars 2012

The material to be studied is a piece of human skull discovered (1999) in Pleistocene sediments from the Orsang river (Gujarat state, India). From anatomical view point, this skull is highly composite: modern Homo sapiens characters are associated to undoubtedly more ancient features. Absolute (...)

Lire la suite

Assessing the relevance of digital elevation models to evaluate glacier mass balance: application to Austre Lovenbreen (Spitsbergen, 79 degrees N)

6 mars 2012

The volume variation of a glacier is the actual indicator of long term and short term evolution of the glacier behaviour. In order to assess the volume evolution of the Austre Lovenbreen (79 degrees N) over the last 47 years, we used multiple historical datasets, complemented with our high (...)

Lire la suite

Accounting for long alpha-particle stopping distances in (U-Th-Sm)/He geochronology: Refinement of the baseline case

1er mars 2012

This contribution proposes a number of methodological refinements for accounting for ejection of energetic particles, most particularly in the case of long alpha-particle stopping distance effects in (U-Th-Sm)/He thermochronometry. Recent stopping-distance estimates for minerals commonly used (...)

Lire la suite

XAFS evidence for amorphous zinc sulfide as a major zinc species in suspended matter from the Seine River downstream of Paris, Ile-de-France, France

1er mars 2012

Zinc is one of the most widespread Trace Metals (TMs) in Earth surface environments and is the most concentrated TM in the downstream section of the Seine River (France) due to significant anthropogenic input from the Paris conurbation. In order to better identify the sources and cycling (...)

Lire la suite

Early diagenetic carbonate bed formation at the sediment-water interface triggered by synsedimentary faults

29 février 2012

The latest Jurassic of the Boulonnais cliffs (N-France, Strait of Dover) corresponds to a homoclinal ramp-type depositional environment, where sedimentation was clastic-dominated (marlstones-sandstones). The Tithonian marlstone formations exhibit two or three carbonate beds in the vicinity of (...)

Lire la suite

On the unmixing of MEx/OMEGA hyperspectral data

29 février 2012

This paper presents a comparative study of three different types of estimators used for supervised linear unmixing of two MEx/OMEGAhyperspectral cubes. The algorithms take into account the constraints of the abundance fractions, in order to get physically interpretable results. Abundance maps (...)

Lire la suite

Late Neogene exhumation and relief development of the Aar and Aiguilles Rouges massifs (Swiss Alps) from low-temperature thermochronology modeling and 4He/3He thermochronometry

29 février 2012

The late Neogene-Quaternary exhumation history of the European Alps is the subject of controversial findings and interpretations, with several thermochronological studies arguing for long-term steady state exhumation rates, while others have pointed to late Miocene-Pliocene exhumation pulses (...)

Lire la suite

A re-interpretation of the recent stratigraphical history of Utopia Planitia, Mars: Implications for late-Amazonian periglacial and ice-rich terrain

28 février 2012

Utopia Planitia, one of the great northern plains of the Mars, is a region where landscape modification by cold-climate processes, i.e. glacial and periglacial, is thought to be widespread. In the middle latitudes of this region a metres-thick mantle, possibly comprising an ice-dust admixture, (...)

Lire la suite

Palaeomagnetic study of a sub-aerial volcanic ridge (Sao Jorge Island, Azores) for the past 1.3 Myr : evidence for the Cobb Mountain Subchron, volcano flank instability and tectono-magmatic implications

28 février 2012

We present a palaeomagnetic study on 38 lava flows and 20 dykes encompassing the past 1.3 Myr on S. Jorge Island (Azores ArchipelagoNorth Atlantic Ocean). The sections sampled in the southeastern and central/western parts of the island record reversed and normal polarities, respectively. They (...)

Lire la suite

Evidence of an eolian ice-rich and stratified permafrost in Utopia Planitia Mars

28 février 2012

Western Utopia Planitia (UP) is dotted with scalloped depressions, small-sized polygons and pingo-like mounds. Within the planetary science community, there seems to be a general agreement that these relatively recent landscape features are indicative of an ice-rich permafrost. However, (...)

Lire la suite