bluuebunny/crossref_metadata_2025_split huggingface dataset:
Eustatic and palaeogeographic control of the western Aurès Upper Cretaceous sedimentation (Algeria)
Authors: Herkat Missoum 
Published: June 2005

Abstract
The Upper Cretaceous sedimentation in the Aurès Mountains occurred in a subsident basin delimited to the south by the Saharan platform and by the Preatlasic high zone to the north. In these series 4 transgressive-regressive megasequences are distinguished, the first one (I) in the late Albian-Cenomanian, the second one (II) in the Turonian, the third one (III) in the Coniacian - Santonian and the fourth one (IV) in the Campanian - Maastrichtian. Each megasequence is made up of three or four sequences, which correspond to third order cycles identified in the eustatic chart of Haq et al. [1987]. In late Albian and lower Turonian periods, during the deposition of basal sequences of the megasequences I and II, the reactivation of basement faults in the Aurès basin occurs consecutively to distension phases, resulting in the formation of rotated blocks. At the same time high eustatic levels are reached according to the global eustatic curve. These processes control the drowning of the carbonate platforms pre-existing to these sequences, and deep ramps progressively form on the tilted block tops. This sedimentary setting generates in the late Albian and lower Turonian series anoxic sequences made up of calcareous and shaly transgressive pelagic intervals. The succeeding sequences lack pelagic facies and are composed of alternate marls / carbonate beds deposited on a homoclinal ramp, indicating a gradual development of shallow open marine conditions, which became progressively restricted upwards. Toward the top of these megasequences, lagunal muds and isolated rudists mounds, surrounded by bioclastic and ooid / pellet banks occur. The Coniacian-Santonian and Campanian-Maastrichtian megasequences are characterized by a shallow ramp sedimentation, essentially marly during the Coniacian, Santonian and Campanian periods, interlayered with some bioclastic / ooid carbonate banks and upwards by sequences mostly homogeneous. The Maastrichtian platform carbonates are composed of bioclastic / ooid sands and were deposited in a ramp-barrier-bank system. Some sequences in the Campanian-Maastrichtian megasequence are condensed or absent due to the accommodation reduction related to a weak subsidence rate period.
Geologic evolution and geodynamic controls of the Tertiary intramontane piggyback Meso-Hellenic basin, Greece
Authors: Ferrière Jacky , Reynaud Jean-Yves , Pavlopoulos Andreas , Bonneau Michel , Migiros Georges , Chanier Frank , Proust Jean-Noël , Gardin Silvia 
Published: June 2005

Abstract
The Meso-Hellenic Basin (MHB) is a large, narrow and elongated basin containing up to c. 5 km of Cenozoic sediments, which partially covers the tectonic boundary between the external, western zones (Pindos) and the internal, eastern zones (Pelagonian) of the Hellenide fold-and-thrust belt. New results, based on micropaleontologic, sedimentologic and tectonic field data from the southern half of the MHB, suggest that the MHB originated as a forearc basin during the first stages of a subduction (Pindos basin), and evolved into a true piggyback basin as a result of the collision of thicker crustal units (Gavrovo-Tripolitsa). The late Eocene forearc stage is marked by sharply transgressive, deep sea turbiditic deposition on the subsiding active margin. At this stage, large scale structures of the Pelagonian basement (i.e. the newly defined “Pelagonian Indentor”) control deposition and location of two main subsiding sub-basins located on both sides of the MHB. The Eocene-Oligocene boundary corresponds to a brief tectonic inversion of the basin, at the onset of collision (main compressive event). The true piggyback stage (Oligo-Miocene) is recorded by slope deposition and dominated by gravity processes (from slumped, fine grained turbidites to conglomeratic fan- or Gilbert-deltas). The new elongated geometry of the MHB is controlled by the underthrusted, NNW-SSE trending, thick external zones. During this stage, the locus of subsidence migrates in the same direction (eastward) as underthrusting. This subsidence, favoured by thick dense ophiolitic basement, is attributed to basal tectonic erosion of the upper Pelagonian unit while the tectonic structures of this upper unit control the stepped migration of subsidence. Growing duplexes in the Gavrovo underthrusted unit, which formed local uplifts, were mainly situated on the eastern side of the subsiding areas and associated with normal faulting (late Oligocene–early Miocene). They constituted new loads that could also have been responsible for minor but widespread lithospheric subsidence. The development of the local and regional uplifts explains the basin evolution toward shallow, dominantly conglomeratic deposits and its final emergence at the end of the middle Miocene. This trend toward emersion is emphasized by the late Miocene global sea-level fall. The MHB was subsequently overprinted by neotectonic deformation associated with the development of a continental basin (Ptolemais) and uplift attributed to the evolution of the Olympos structure that developed further east as the underthrusting moved in this direction. These results demonstrate that the Meso-Hellenic Basin evolves as a large scale piggyback Basin and that its sedimentary infill is largely controled by tectonic activity rather than only eustatic sea-level variations.
Bathymetric map of the NE Atlantic Ocean and Bay of Biscay: kinematic implications
Authors: Sibuet Jean-Claude , Monti Serge , Loubrieu Benoît , Mazé Jean-Pierre , Srivastava Shiri 
Published: June 2005

Abstract
The new bathymetric map of the Bay of Biscay and Northeast Atlantic Ocean is based on available conventional and swath bathymetric data. It extends from the European coast to the mid-Atlantic ridge in longitude and from the Azores-Gibraltar fracture zone to 50°N in latitude. Grid spacing is 1 km. The map is in Mercator projection at a 1/2,400,000 scale (41°N latitude). With respect to previously published maps, the detailed morphology of the Eurasian and Iberian continental margins is now well established. In addition, we have mapped the two fossil trajectories of the Bay of Biscay triple junction, which limit the western extension of the Bay of Biscay sensu stricto.
The Bay of Biscay and Northeast Atlantic Ocean opened simultaneously, between chrons M0 (118 Ma) and 33o (80 Ma). A triple junction existed during that period. Fossil triple junctions trajectories on each of the three Eurasia (EU), Iberia (IB) and North America (NA) plates separate oceanic domains which were formed between the three plate pairs : IB/EU for the Bay of Biscay, EU/NA and IB/NA for the northern and southern portions of the Northeast Atlantic respectively. On each side of the fossil trajectories, rift directions formed between different plate pairs display different azimuths. The three triple junction branches have been identified on the basis of magnetic, seismic and bathymetric data. They are generally associated with a basement ridge which generally appears in the youngest parts of triple junction branches. The intersections of fossil trajectories with the base of the continental margins correspond to conjugate points before the opening of the Bay of Biscay, giving an additional independent constraint for plate reconstructions at M0 time. In addition, rotations of Iberia as deduced from plate kinematic reconstructions at chrons A33o (80 Ma), M0 (118 Ma) and M25 (156.5 Ma), fit with those derived from paleomagnetic declination data of the stable Iberia with respect to EU. The identification of chrons M0 and M3 (125 Ma) in the Bay of Biscay implies that the northern Bay of Biscay margin rifting episode ended in lowermost Cretaceous instead of late Aptian as currently admitted in the litterature. The duration of the rifting episode is reduced to about 20 Ma, as it has been already suggested for the Iberian Abyssal Plain margin [Wilson et al., 2001].
Quaternary calc-alkaline and alkaline volcanism in an hyper-oblique convergence setting, central Myanmar and western Yunnan
Authors: Maury René C. , Pubellier Manuel , Rangin Claude , Wulput Laurence , Cotten Joseph , Socquet Anne , Bellon Hervé , Guillaud Jean-Philippe , Htun Hla Myo 
Published: June 2005

Abstract
Quaternary to recent volcanic centres located in Central Myanmar basin and in western Yunnan (Tengchong rift) display contrasted geochemical signatures. Mt. Popa lavas range in composition from calc-alkaline to potassic calc-alkaline and derive from partial melting of a subduction-modified mantle. The Monywa Holocene maars are made up of absarokites thought to result from low degrees of melting of a similar source. The Tengchong rift potassic calc-alkaline andesites and dacites also display typical subduction-related imprints. On the contrary, the geochemical signature of the Singu alkaline mafic basaltic trachyandesites which are offset by the Sagaing Fault suggests that they derive from the melting of deep enriched intraplate-type mantle, similar to the source of common Plio-Quaternary alkali basalts and related rocks from the Sundaland.
The origin of this uncommon spatial and temporal magmatic association is connected to an unusual tectonic setting of hyper-oblique convergence. The collision between India and the Sundaland is marked by shear partitioning within Myanmar, a significant part of the right lateral motion being accommodated by the Sagaing Fault. Rapid uprise of high temperature alkaline magmas derived from the melting of enriched Sundaland-type mantle and channelled by Neogene fault planes parallel to the Sagaing Fault led to the emplacement of the Singu lavas. Active subduction of the Gulf of Bengal oceanic lithosphere resulted in the development of a Wadati-Benioff plane located 100 to 140 km beneath Mt. Popa and Monywa. The dehydration of this slab led to metasomatism and subsequent melting of the Central Myanmar mantle wedge, and finally to the emplacement of calc-alkaline and shoshonitic magmas in those volcanoes. The origin of the subduction-related signature of the Tengchong lavas has to be related to an older subduction event.
Use of close-range photogrammetry to characterize fracture surfaces
Authors: Filipe Frédéric , Sausse Judith 
Published: June 2005

Abstract
Natural fractures are characterized by rough surfaces and complex fluid flows. A large distribution of apertures (residual voids) within their walls and the presence of contact points produce heterogeneous flows (channelling). The resulting permeabilities, porosities or fluid-rock exchange surfaces cannot be realistically modelled by parallel and smooth plate models. It is therefore very important to better constrain models of the fracture planes : asperity heights and aperture distribution to be able to fix specific models of permeability in specific fracture void geometry. In this approach, a precise description of the fracture surface planes is given by providing some new quantitative data of surface roughness in the case of natural fractures. Studied fractures are sampled in a granite and a sandstone in the deep basement of the Hot Dry Rock site of Soultzsous-Forêts (Bas-Rhin, France). An original use of close-range photogrammetry is performed to quantify XYZ data on fracture walls. This methodology is presented as a non destructive, precise and accurate technology to quantify some digital terrain models (DTM) of the fracture plane topography. XYZ results are statistically treated in terms of surface roughness and tortuosity and are compared for different rocks to previous data obtained by mechanical profilometry. The results shows that the photogrammetric approach gives same order of asperity heights magnitudes as profilometry despite a shift towards more important values of roughness when close range photogrammetry uses relative autocorrelation models. The advantage of photogrammetry is that this technique gives very quick results and is non destructive when thin alteration or pulverulent deposits are present within fracture walls or in the rock matrix. The disadvantage is that a slight smoothing of data is inherent to an absolute model calibration. Finally only relative 300*300 DTM are finally chosen to match profilometry data because of their higher precision in terms of micro roughness description to compare natural fracture surfaces. In the objective of a classification of fracture roughness in specific geological contexts, the photogrammetric approach gives a good estimation of different classes of roughness in function of rock alteration and type.
A giant pterosaur from the Lower Cretaceous of the eastern Paris Basin
Authors: Buffetaut Eric 
Published: June 2005

Abstract
A large pterosaur bone, preserved as a natural cast of the interior cavity, was found in an old collection kept at the Natural History Museum of Troyes (France). Although no precise geographical data are available, the lithology of the matrix indicates that it comes from the Hauterivian Toxaster Limestone of the eastern Paris Basin. Despite its unusual preservation, the specimen shows various morphological details, and is identified as an ornithocheiroid pterosaur humerus. This specimen is among the largest known pterosaur humeri (length as preserved: 345 mm), indicating a wing span of more than 7 metres. It shows that giant pterosaurs had already appeared at a very early stage in the Cretaceous.
Statistical analysis of the volcanic eruption frequency in the azores islands : a contribution to risk assessment
Authors: Caniaux Guy 
Published: June 2005

Abstract
The datations of the last eruptive events which have occurred on 13 active volcanic complexes of the Azores are presented. By supposing that these events follow a statistical Poisson distribution, we estimate the occurrence period of these events, as well as the eruption probabilities for the next 300 years. Pico Mountain, Região dos Picos (São Miguel Island), the stratovolcano of Sete Cidades (São Miguel Island), the linear volcanic complexes of São Roque – Piedade (Pico Island) and of Capelo (Faial Island) must be considered as the most active volcanoes of the archipelago. The eruption styles of next eruptions are also specified.
The ammonite fauna renewal at the boundary middle–late Toarcian: new data and consequences
Authors: Becaud Marc , Rulleau Louis , Elmi Serge 
Published: June 2005

Abstract
Several proposals have been made concerning the Toarcian informal substages. A three part division, here adopted, includes a Middle Toarcian encompassing the Bifrons and Variabilis ammonite zones, according to the definition well established by Monestier [1921]. Other authors, following Buckman [1888], admit a binary definition but with different meanings. The boundary is placed either below the Variabilis (Lower / Upper Toarcian limit), or below the Thouarsense zones (“Whitbian”–“Yeovilian” limit) [Howarth, 1992]. These differences are largely due to a strong sedimentary instability: condensations, gaps and faunal mixings were widespread during the Variabilis zone in NW Europe and eurocaucasian domain and its Tethyan equivalent, the Gradata zone. Contemporarily, a major renewal occurred in the ammonite faunas. This provoked a near general segregation that is the reason of the use of different zone standards.
In NW Europe, the faunal renewal occurred during the Variabilis zone as it as been established in the stratotype localities of Poitou and Vendée (Poitou – Vendée) [Gabilly, 1973, 1976a]. This is also well known in the Causses [Guex, 1972, 1975]. These two areas give good reference sections for the ammonite succession at the top of the Middle Toarcian. These data have been supplemented by recent works concerning NW Europe as well as the Tethyan margins (Portugal, Betics, Morocco, Algeria, Apennines). New observations have also been realized in France (Poitou-Vendée, Causses, Lyon area). They allow to have a better knowledge of the development of the faunal renewal and of the appearance of new taxa (genus, sub and superfamilies). Special attention is given to the Phymatoceratids, Grammoceratids and Hammatoceratoids.
In consequence, the main renewal did not happened at the end of the Middle Toarcian (end of the Variabilis zone) but sooner at the beginning of the Illustris subzone. New ammonite morphologies appeared that will dominate the assemblages at the beginning of the late Toarcian (Grammoceratinids) and that will be at the origin of the main Middle Jurassic assemblages (Hammatoceratids). Among the species from the Illustris subzone, some are good markers for the correlations between the faunal domains and provinces (“Pseudogrammoceras” aratum Buck., “Pseudogrammoceras” subregale Pinna, “Geczyceras” costatum (Gab.), Osperleioceras (Pseudopolyplectus) bicarinatum (Ziet.)).
It appears that the difficulties to place the Middle–Upper Toarcian limit result closely of the sedimentary perturbations that happened in Europe from the west to the eurocaucasian domains and in the whole western Tethys. The substage problem is secondary as stated by Gabilly but it is convenient for long range comparisons. The main units to establish the correlations are the biostratigraphic zones (biozones). In such a matter, the Variabilis zone is of particular importance, according to the coeval sedimentary and palaeontologic events.
Late Maastrichtian and K/T paleoenvironment of the eastern Tethys (Israel): mineralogy, trace and platinum group elements, biostratigraphy and faunal turnovers
Authors: Adatte Thierry , Keller Gerta , Stüben Doris , Harting Markus , Kramar Utz , Stinnesbeck Wolfgang , Abramovich Sigal , Benjamini Chaim 
Published: June 2005

Abstract
The late Maastrichtian to early Danian at Mishor Rotem, Israel, was examined based on geochemistry, bulk rock and clay mineralogies, biostratigraphy and lithology. This section contains four red clay layers of suspect impact or volcanic origin interbedded in chalk and marly chalks. PGE anomalies indicate that only the K/T boundary red layer has an Ir dominated PGE anomaly indicative of an impact source. The late Maastrichtian red clays have Pd dominated PGE anomalies which coincide with increased trace elements of terrigenous and volcanogenic origins. Deccan or Syrian-Turkey arc volcanism is the likely source of volcanism in these clay layers. Glauconite, goethite and translucent amber spherules are present in the clay layers, but the Si-rich spherules reported by Rosenfeld et al. [l989] could not be confirmed. The absence of Cheto smectite indicates that no altered impact glass has been present. The red layers represent condensed sedimentation on topographic highs during sea level highstands. In the Negev area, during the late Maastrichtian, the climate ranged from seasonally wet to more arid conditions during zones CF3 and CF2, with more humid wet conditions in the latest Maastrichtian zone CF1 and in the early Danian, probably linked to greenhouse conditions. Planktic foraminifera experienced relatively high stress conditions during this time as indicated by the low species richness and low abundance of globotruncanids. Times of intensified stress are indicated by the disaster opportunist Guembelitria blooms, which can be correlated to central Egypt and also to Indian Ocean localities associated with mantle plume volcanism. Marine plankton thus support the mineralogical and geochemical observations of volcanic influx and reveal the detrimental biotic effects of intense volcanism.
A New Way to Use Solid‐State Carbon‐13 Nuclear Magnetic Resonance Spectroscopy to Study the Sorption of Organic Compounds to Soil Organic Matter
Authors: Smernik Ronald J. 
Published: June 2005

ABSTRACTSeveral solid‐state 13C nuclear magnetic resonance (NMR) techniques were used to characterize soil organic matter spiked with 13C‐labeled organic compounds spanning a range of hydrophobicities (benzoic acid, benzophenone, naphthalene, phenanthrene, and palmitic acid). The chemical shifts of NMR resonances of the sorbed species were shifted by up to 3 ppm relative to those of the neat compounds. Sorption also resulted in increased resonance linewidth for the compounds containing a single 13C label, indicating the presence of a range of different chemical environments at the sites of sorption. On the other hand, sorption decreased the linewidth of the resonance of naphthalene, which was uniformly 13C‐labeled. This was attributed to the removal of intermolecular 13C–13C dipolar coupling. Heterogeneity of the organic matter was demonstrated using the spectral editing technique proton spin relaxation editing (PSRE), which enabled the identification and quantification of charcoal‐rich domains characterized by rapid rates of proton spin–lattice relaxation in the static frame (T1H), and humic domains characterized by slow rates of T1H relaxation. Furthermore it was demonstrated that the sorbed 13C‐labeled molecules “inherit” the T1H “signature” of the organic matrix in their immediate vicinity. Thus PSRE on the spiked soils enabled evaluation of the relative affinity of the two domain types for the sorbate molecules. The charcoal‐rich domains were shown to have a twofold to tenfold greater affinity for the organic compounds, with greater differences found for the more hydrophobic compounds.
Accelerated Soil Dissipation of Tebuconazole following Multiple Applications to Peanut
Authors: Potter Thomas L. , Strickland Timothy C. , Joo Hyun , Culbreath Albert K. 
Published: June 2005

ABSTRACTRepeated application may increase rates of pesticide dissipation in soil and reduce persistence. The potential for this to occur was investigated for the fungicide, tebuconazole (α‐[2‐(4‐chlorophenyl)ethyl]‐α‐(1,1‐dimethylethyl)‐1H‐1,2,4‐triazole‐1‐ethanol), when used for peanut (Arachis hypogaea L.) production. Soil samples were collected from peanut plots after each of four tebuconazole applications at 2‐wk intervals. Soil moisture was adjusted to field capacity as necessary and samples were incubated in the laboratory for 63 d at 30°C. Untreated plot samples spiked with the compound served as controls. Results indicated accelerated dissipation in field‐treated samples with the time to fifty percent dissipation (DT50) decreasing from 43 to 5 d after three tebuconazole applications. Corresponding increases in rates of accumulation and decay of degradates were also indicated. Best‐fit equations (r2 = 0.84–0.98) to dissipation kinetic data combined with estimates of canopy interception rates were used to predict tebuconazole and degradates concentration in soil after each successive application. Predicted concentrations compared with values measured in surface soil samples were from twofold less to twofold greater. Use of kinetic data will likely enhance assessments of treatment efficacy and human and ecological risks from normal agronomic use of tebuconazole on peanut. However, the study indicated that varying soil conditions (in particular, soil temperature and water content) may have an equal or greater impact on field dissipation rate than development of accelerated dissipation. Results emphasize that extension of laboratory‐derived kinetic data to field settings should be done with caution.