bluuebunny/crossref_metadata_2025_split huggingface dataset:
Premiere datation par ammonite et brachiopodes du Tithonien au Saleve (Haute-Savoie France), consequences sur l'interpretation stratigraphique de paleogeographique du Jurassique superieur
Authors: Enay Raymond , Boullier Annick 
Published: June 2005

Abstract
The oldest beds outcropping in the Mt Saleve have in the past been referred to the Kimmeridgian, but an ammonite found in situ together with some brachiopods give them a date somewhere in the middle part of the Lower Tithonian. Recently published interpretation of the local Upper Jurassic stratigraphy and relationship to the Jura platform have therefore to be revised. The Upper Jurassic succession at Saleve is distinguished by a Tithonian continuation of a carbonate platform facies prograding basinward, which compares well with the similar well-known Bec de I'Echaillon, near Grenoble. An erosional disconformity, related by other authors to a fall in relative sea-level and interpreted as a type I sequence boundary associated with a large emergence of the Jura platform, cannot be referred to the Kimmeridgian-Tithonian and must lie somewhere in the Lower Tithonian rocks above the Gravesia beds.
La denudation tectonique de la zone ultradauphinoise et l'inversion du front brianconnais au sud-est du Pelvoux (Alpes occidentales); une dynamique miocene a actuelle
Authors: Tricart Pierre , Schwartz Stephane , Sue Christian , Poupeau Gerard , Lardeaux Jean-Marc 
Published: June 2005

Abstract
In the western Alps, to the southeast of the Pelvoux massif (Champsaur-Embrunais-Brianconnais-Queyras transect), the Brianconnais zone consists of the southern tip of the Zone Houillere and small nappes of Mesozoic sediments, emplaced during the Eocene in HP-LT metamorphic conditions. During the Oligocene this tectonic pile was thrusted onto a late Eocene to early Oligocene flexural basin, deformed in low grade metamorphic conditions and belonging to the Ultradauphine zone. This major thrust, called here CBF [Chevauchement Brianconnais Frontal: Tricart 1986] represents the boundary between the external and the internal zones of the western Alps. It contains thin tectonic lenses of Subbrianconnais origin, so that the Brianconnais Front and the Penninic Front almost merge. Late Alpine extension. - We have recently discovered that the CBF was subsequently reactivated as an extensional detachment. This major negative inversion is associated with widespread extension in the internal (Brianconnais and Piemont) zones, resulting in multiscale normal faulting. Current field work in the Queyras area shows that this brittle multitrend extension is a continuation of the ductile extension that accompanied the exhumation of blue-schist bearing metamorphic units. Along the same transect, the external (Ultradauphine) zone was not affected by late-Alpine extension. This is still the present situation: to the east of the aseismic Pelvoux massif, the CBF bounds the Brianconnais seismic arc, the activity of which may be the continuation of the late-Alpine extension. At the scale of the western Alpine arc, active extensional-transtensional tectonics dominate in the internal zones while compressional uplift affects the external zone. In this contrasted stress field, the thrust-fault zone between internal and external arcs plays a major role of decoupling that can be demonstrated in several sites between the area analysed here and the Central Alps, including along the Ecors profile. Contribution of thermochronology. - In this paper, we compare apatite fission track (FT) ages from both sides of the inverted CBF to the southeast of the Pelvoux massif. In the hangingwall of the CBF, two ages were obtained from magmatic intrusions within the Zone houillere, close to Briancon. They are compared to recently published ages from the Champsaur Sandstones unit in the footwall of the CBF, along the same transect.
The oldest and first nearly complete skeleton of a chelid, of the Hydromedusa sub-group (Chelidae, Pleurodira), from the Upper Cretaceous of Patagonia
Authors: de la Fuente Marcelo , de Lapparent de Broin France , Manera de Bianco Teresa 
Published: June 2005

Abstract
A new pleurodiran (side necked) turtle is described on material from the Upper Cretaceous of Patagonia, from sediments outcropping at Cerro Blanco, Yaminue Creek, Rio Negro, Argentina. The sediments are compared to those from the Pellegrini lake area referred to the middle Member of the Allen Formation, Upper Campanian-Lower Maastrichtian. Yaminuechelys gasparinii n.g., n.sp., is a pleurodiran turtle on the pelvis sutured to the shell and a chelid on the formula of cervical vertebrae and the lateral cheek emargination, deeply extended towards (as here) or up to the posterior emargination. It is the oldest record of a nearly complete skeleton of a chelid, long necked (elongated cervical vertebrae, lowered skull), and the first sufficiently known of the Chelodina-Hydromedusa group (elongated skull, lowered neural arch and centrum of the cervicals, low zygapophyses processes, strong polygoned decoration) and of the Hydromedusa sub-group (widened inner nares by reduced palatine ossification). The carapace is 41,8 cm long. It is more primitive than Hydromedusa (Eocene-Extant, South America) and retains primitive characters either still present or no more present in the other chelids of the Pseudemydura, Emydura and Phrynops groups (short necked) and Chelus group (long necked), representing the anterior clades of phyletic diversification [Gaffney, 1977], or evolutive grades, of the family. Such are plesiomorphic, relative to Hydromedusa, the less pronounced lateral skull emargination, wider and longer hyoid elements, wider nucal and cervical, this not drawn back, presence of lateral mesoplastra, not shortened bridge, straight borders of the not shortened and not widened posterior plastral lobe, amphicoelous sacrals and caudal vertebrae uniting amphicoelous, concavoplaty--(i.e. anteriorly concave, posteriorly flat) and procoelous or weakly procoelous elements. As Hydromedusa, Yaminuechelys n. g. retains primitive characters such as the long series of neurals, the very lateral attachment of the axillar and inguinal processes and the attachment of the pelvis, below pleural 8 (and 7 in the extant form) and a small part of the suprapygal, and the ischitatic sutures prolonged on the xiphiplastral points. It is distinguished by the apomorphic presence of a wide and week anterior carapacial notch. Yaminuechelys n.g., or aff. Yaminuechelys spp. are known in Patagonia by fragmentary remains in a dozen of Upper Cretaceous and two Palaeocene localities. Before them, chelids are known in the world only by undefined smaller forms from Lower Albian and Upper Albian-Cenomanian Patagonian localities. In Australia, they are known from Palaeocene-Lower Eocene (no Cretaceous data before) with already extant Australian diversified forms. Yaminuechelys n.g. demonstrates how long the diversification in chelids is realized in South Gondwana before the full break of the continents.
Wind blown sediment mass budget of Sahelian village land units in Niger
Authors: Rajot Jean-Louis 
Published: June 2005

Abstract
To assess the mass budget of aeolian sediments transported by wind (erosion vs. deposition) at the scale of village land units (25 kmX25 km), measurements were carried out during 3 years (from 1996 to 1998) in a cultivated field and in a fallow area simultaneously. These were located in the Sahelian zone of Niger with an average annual rainfall of 560 mm. The vertical upward fluxes of particles &lt;20 mu m exported from the study area were estimated from the horizontal sediment fluxes measured using BSNE sand catchers. This mass of exported dust was compared with the vertical downward fluxes of particles of the same size range (&lt;20 mu m) measured using passive CAPYR collectors. Values of deposition recorded in the field and in the fallow were similar. In the field, wind erosion reached its maximum in May and June when the vegetation cover was minimal. In the fallow area, wind erosion was always very low in comparison with the field. It occurred during the strongest storms when the grass cover was minimal. Nevertheless, the net balance between deposition and erosion was highly positive in the fallow areas. These results have been extrapolated at the scale of the village land units based on the current land use. At this scale, the balance was positive for the arable land, indicating a net deposition of aeolian sediments of +0.36 t ha (super -1) yr (super -1) . However, the complete disappearance of fallow land would result in a balanced budget for the arable land.
Tectonometamorphic evolution of the Schistes Lustres Complex; implications for the exhumation of HP and UHP rocks in the Western Alps
Authors: Agard Philippe , Jolivet Laurent , Goffe Bruno 
Published: June 2005

Abstract
We present new structural and metamorphic data on the Schistes Lustres complex which occupies a central position in the western Alps between the external LP and the internal UHP domains (e.g., the Dora Maira massif). Metamorphic conditions are shown to increase progressively from west to east from ca. 12-13 kbar/300-350 degrees C to 20-21 kbar/450-500 degrees C close to the Dora Maira massif. Two distinct exhumation episodes are recognized: (1) A pervasive east-vergent ductile D2 event, with a large component of vertical shortening, took place under low blueschist-facies to greenschist-facies conditions. This event is responsible for most of the exhumation of the Schistes Lustres complex as well as for the preservation of carpholite occurrences at its front, and took place during the period 50-40 Ma. (2) A west-vergent ductile-to-brittle, highly non-coaxial, extensional D3 event subsequently developed, with a deformation intensity decreasing from east to west. This event took place at subgreenschist-facies conditions and is coeval with (and probably derives from) the west-vergent greenschist deformation taking place in the Dora Maira massif and other internal domains by ca. 40-35 Ma.
The Middle Jurassic-Lower Cretaceous Rosso Ammonitico succession of Monte Inici (Trapanese Domain, western Sicily); sedimentology, biostratigraphy and isotope stratigraphy
Authors: Cecca Fabrizio , Savary Berengere , Bartolini Annachiara , Remane Juergen , Cordey Fabrice 
Published: June 2005

Abstract
The pelagic Jurassic successions of the Trapani region of western Sicily are dominated by the characteristic Tethyan Rosso Ammonitico lithofacies. In order to revise the stratigraphy (sedimentology, microbiofacies, ammonite and calpionellid biostratigraphy, isotope stratigraphy) and to define a reference section, a well exposed succession of Rosso Ammonitico, spanning the Callovian-Upper Berriasian interval, has been selected in the eastern sector of Monte Inici, Trapani province. A sedimentological study has enabled us to distinguish three subfacies within the Rosso Ammonitico: nodular, pseudo-nodular, and intraclastic nodular subfacies. The two latter subfacies are characterized by the presence of intraclasts produced largely by mechanical abrasion, that suggest a formation by hydrodynamic processes. Increasing hydrodynamic energy is inferred from Lower Kimmeridgian to Upper Berriasian deposits. The vertical evolution of the microfacies shows the greatest skeletal diversity in the Middle Oxfordian, coinciding with a peak of delta 13 C. Ammonites are abundant in the Middle Oxfordian-Lower Kimmeridgian, where several ammonite zones have been recognized. With the aid of calpionellids we have been able to identify the Jurassic-Cretaceous boundary and to recognize high frequency biostratigraphic intervals in the Berriasian, that can be correlated throughout palaoetethys. The delta 13 C curve shows a marked positive peak at the base of the section (Lower to Middle Callovian) and a second, composite, positive excursion in the Middle-Upper Oxfordian. From the base of the Kimmeridgian, delta 13 C values slowly decrease, remaining low in the Berriasian. Oxygen isotope values exclude late burial diagenetic overprinting and the carbon peaks are interpreted as reflecting carbon cycle perturbations due to high biological productivity that may mirror global palaeoenvironmental variations. The Middle Oxfordian peak coincides with the highest skeletal diversity, with the first occurrence of the nodular facies, and with the onset of cherty limestones (lateral equivalents of radiolarites) in the southern sector of Monte Inici, and in localities to the west and north. The heteropy between Rosso Ammonitico and radiolarites s.l. suggests that sedimentation was controlled by local palaeotopography.
Leaching of polished sections : an integrated approach for studying the liberation of heavy metals from lead-zinc metallurgical slags
Authors: Ettler Vojtěch , Mihaljevič Martin , Touray Jean-Claude , Piantone Patrice 
Published: June 2005

Abstract
Pb-Zn metallurgical slags are defined by European Community regulations either as waste (hazardous materials) or as secondary commercial substances. The knowledge of their stability is essential in order to assess strategies for their management. A scientific understanding of metal release requires (i) knowledge of the phases hosting the different hazardous metals (e.g., Pb) and (ii) knowledge of the relative solubility of these phases. This paper is devoted to a mineralogical characterisation of slags resulting from different processing technologies and to long-term static leaching experiments run under different pH-conditions. The main mineral phases of slags are spinel-family oxides, Ca-Fe aluminosilicates (clinopyroxene, olivine-type phases, melilite, garnet), silicate glass, sulphide (galena, wurtzite) and intermetallic droplets. Leaching experiments were conducted on polished sections, which were introduced into batch reactors and leached by the following solutions: (i) citric acid-sodium citrate buffer at pH ~ 3 (organic soil-simulating solution), (ii) deionised water without any pH control and (iii) calcium hydroxide saturated solution buffered at pH ~ 12.5 (concrete-simulating solution). Sulphide/metallic phases display an extremely low stability whatever the solution. Under organic-acid conditions, Ca-rich (melilite) and Fe-rich (fayalite) phases are preferentially dissolved. Spinel-family oxides are always extremely stable. SEM observations evidence the important role of citrate, which favours the extraction through chelation of metallic elements on the slag surface. The silicate glass and sulphide/metallic droplets are the most unstable phases under intermediate conditions (deionised water). However, under such conditions, the mobility of Pb, Zn and As is drastically limited by precipitation/adsorption processes, as shown by geochemical modelling (PHREEQC, EQ3NR). A preferential dissolution of glass, clinopyroxene and garnet occurs in alkaline environments. Additionally, lead is significantly released by the dissolution of galena and remains dissolved. On the contrary, zinc content is likely controlled by precipitation of secondary zincite (ZnO) or zinc hydroxide, as predicted by the EQ3NR calculations. The results of static leaching experiments under various conditions confirm that the disposal of slag in organic-rich environments (e.g., peat soil) or the use of slag in concrete technology should be avoided due to the high mobilisation of Pb and other toxic elements.
Slab melting and slab melt metasomatism in the Northern Andean Volcanic Zone : adakites and high-Mg andesites from Pichincha volcano (Ecuador)
Authors: Bourdon Erwan , Eissen Jean-Philippe , Gutscher Marc-André , Monzier Michel , Samaniego Pablo , Robin Claude , Bollinger Claire , Cotten Joseph 
Published: June 2005

Abstract
Situated in the fore-arc of the Northern Volcanic Zone (NVZ) of the Andes in Ecuador, Pichincha volcano is an active edifice where have been erupted unusual magmas as adakites and high-Mg andesites. The particular geodynamic setting of the ecuadorian margin (i.e. the flat subduction of the Carnegie Ridge) suggests that thermo-barometric conditions for the partial melting of the oceanic crust are accomplished beneath this volcano. Pichincha adakites possess all the geochemical and isotopic characteristics of slab melts described in various other arc settings. High-Mg andesites with geochemical characteristics close to those of adakites present strong enrichments in MgO that suggest that, once they were produced by ca. 10 % partial melting of the downgoing subducted slab, some adakites en route to the surface strongly interacted with the peridotitic mantle wedge. Adakitic magmas could then represent, as in many other arcs where slab melting occurs, the principal metasomatic agent of the mantle in the NVZ in Ecuador.
Implication of the compositional diversity of the soluble organic matrices of carbonate skeletons
Authors: Dauphin Yannicke 
Published: June 2005

Abstract
The soluble organic matrices were extracted from carbonated shells of molluscs and a Scleractinia. The composition was analysed with UV spectrometry, HPLC with a dual detection and 2D electrophoresis. Few data are available on such components. However, the obtained results confirm the previous data: quantities but also properties of the matrices are characteristic of the taxa. Proteins/sugars ratios, molecular weights and acidities differ in all the studied samples. The diagenetic changes are different for different species. In a multilayered shell, each layer has a particular diagenetic evolution. Thus, some biases are induced in the faunal statistics used in palaeoecological studies. After the death of the animal, the rates of degradation of the skeletons are different. The soluble organic matrices are more or less rapidly dispersed in sea water, depending on the resistance of the skeletons. From this point of view, fragile shells contribute largely to the organic composition changes of surrounding water. The faunal composition and the biochemical characteristics of the skeletons are important for the evolution of the marine environment. Their soluble organic matrices are dispersed in the water and sediments, and their strong acidity plays a major role in the precipitation of carbonates. Moreover, these invisible matrices are permanently recycled in sedimentary processes.
The landslide and local tsunami of 13 September 1999 on Fatu Hiva (Marquesas Islands; French Polynesia)
Authors: Okal Emile A. , Fryer Gerard J. , Borrero José C. , Ruscher Christophe 
Published: June 2005

Abstract
On 13 September 1999, a local tsunami, comprising two waves separated by a few minutes, hit the village of Omoa, on the island of Fatu Hiva, French Polynesia. It inflicted serious damages to structures built close to the seashore, in particular to the local elementary school. The tsunami was generated by the collapse of a basaltic cliff, located 3 km to the southeast of Omoa, along the coastline. The volume of the landslide is estimated to range from 2 to 5 million m3, of which 60 % fell into the sea. A preliminary simulation of the tsunami provides an acceptable explanation of wave amplitudes, as well as an estimate of the origin time of landslide.
The late Ordovician carbonate sedimentation as a major triggering factor of the Hirnantian glaciation
Authors: Villas Enrique , Vennin Emmanuelle , Álvaro José Javier , Hammann Wolfgang , Herrera Zarela A. , Piovano Eduardo L. 
Published: June 2005

Abstract
A new approach explaining the main forcing factor of Hirnantian glaciation is proposed herein. It follows the models associating occurrences of continental glaciations with periods of low atmospheric CO2 levels. The accumulation of great volumes of carbonates during pre-Hirnantian late Ordovician, in regions where these deposits were previously absent, is suggested as a major sink of atmospheric CO2. This would have caused an important lowering of the average temperature in the early Hirnantian, after CO2 values had attained a certain threshold. This process was maintained by other positive feedbacks, such as the short-term carbonate weathering CO2 sink. An increase of the direct flux of CO2 from the atmosphere to the oceans by means of dissolution would have been driven by the enhancement of carbonate deposition. The great inundation of the low latitude Laurentia craton during Cincinnatian times and the establishment of a temperate-water carbonate sedimentation on the North Gondwana margin during pre-Hirnantian Ashgill allowed the burying of more than 840 × 1015 kg (1.9 × 1019 mol) of dissolved CO2. This mass is equivalent to nearly 350 times the present values of atmospheric CO2. This is important enough to have greatly altered the equilibrium between the CO2 dissolved in the oceans and the partial pressure of CO2 in the air, eventually causing an important reduction of the latter. The new model also offers a simple explanation for the end of the glaciation after a short time-span. Glacioeustatic lowering of the sea level, concomitant with the glaciation, would have stopped the extra-sedimentation of carbonate due to the retreat of the oceans from the platforms, closing this CO2 sink. Pre-glacial CO2 levels would then recover, due to volcanic and metamorphic CO2 outgassing. After subsequent melting of the ice cap, oceanic circulation did not recover pre-Hirnantian Ashgill strength, resulting in a strong stratification of ocean waters and precluding the recovery of an extensive carbonate deposition. The well-known positive shift in the δ13C at the base of the Hirnantian is assumed to have been caused by weathering and dissolution of carbonates, relatively enriched in 13C, during the glacioeustatic regression and exposure of the platforms.
Quantification of the control of sequences by tectonics and eustacy in the Dniepr-Donets Basin and on the Russian Platform during Carboniferous and Permian
Authors: Izart Alain , Le Nindre Yves , Stephenson Randell , Vaslet Denis , Stovba Sergei 
Published: June 2005

Abstract
A comparative quantitative analysis of late Paleozoic subsidence in the Moscow and Dniepr-Donets basins provides additional insight into the relative importance of tectonics and eustacy as sedimentation driving forces. Late Devonian rifting clearly displayed in the Dniepr-Donets Basin and underlying Precambrian East European Craton probably also affected the Moscow Basin. After this episode, however, the history of both basins diverged ; rifting processes ceased in the Moscow Basin but continued in the Dniepr-Donets Basin. The Moscow Basin is an intracratonic basin that can be modelled with a lithospheric heating phase from Devonian to Bashkirian times and a subsequent cooling phase generating thermal subsidence from Moscovian to Asselian times. The Dniepr-Donets Basin is a rift basin displaying an initial rifting phase during the late Devonian, an initial phase of post-rift evolution from the Tournaisian to the base of late Viséan, and a second rifting phase, seen mainly in the Donets and Donbas segments only, from late Viséan to Asselian times. Subsequent subsidences ended with uplift during the Sakmarian and were overprinted by compressional tectonics during Mesozoic and Cenozoic times. A comparison of local and global second-order stratigraphic sequences, allowing an estimation of the ratio of the importance of eustatic to tectonic processes controlling subsidence in each basin, demonstrates that eustacy controlled sedimentation in the Moscow Basin and tectonics prevailed in the Dniepr-Donets Basin.