bluuebunny/crossref_metadata_2025_split huggingface dataset:
Sea-level changes and ammonite faunal turnover during the Lias/Dogger transition in the western Tethys
Authors: Sandoval José , O’Dogherty Luis , Vera Juan Antonio , Guex Jean 
Published: June 2005

Abstract
The aim of this paper was to investigate the possible connections between ammonite faunal turnover and the eustatic events recorded in Tethyan sequences during the middle Toarcian/early Bajocian time interval. For this we have analysed the biostratigraphic ranges, at the subzone level, of approximately 600 ammonite species belonging to 160 genera from several selected sections of the western Tethys (Mediterranean and Submediterranean provinces). The analysis of taxon ranges enabled us to plot curves for ammonite faunal turnovers, inter-subzonal distance, and diversity. Comparing the mentioned curves with Tethyan sequences [Hardenbol et al., 1998], we find that sea-level changes correlate well with origination and extinction events and faunal diversity. Most of the faunal turnovers correlate with stratigraphic events. Extinction events with their corresponding decrease in diversity correlate with regressive intervals and with major or minor sequence boundaries. Origination events and their corresponding increase in diversity were clearly connected with transgressions in Tethyan sequences. In several cases, the major sequence boundary and the subsequent transgressive phase correlate with major ammonite faunal turnover, whereas minor or medium sequence boundaries generally gave rise to minor or medium turnovers.
Role of an extension of pre-Quaternary age for the evolution of the carbonate massifs in the occidental Betic Cordillera: The case of the Yunquera-Nieves massif (southern Spain)
Authors: Pistre Séverin , Liñán Cristina , Andreo Bartolomé , Carrasco Francisco , Drogue Claude , Martin-Algarra Agustín 
Published: June 2005

Abstract
A simultaneous analysis of the fracture geometry and paleo-stress fields of the karstic Yunquera-Nieves massif i n southern Spain (Málaga Province) has been carried out with microtectonic stations. It reveals polyphased t ec -tonics linked to the structural position of this carbonate domain in the western Betic Cordillera.
Among the tectonic regimes described in this domain appears a distensive stage with a radial trend probably of post-Tortonian to Quaternary age. Todate, it has seldom been described and is absent from geodynamic models though it seems to have had a regional importance. Furthermore, it played a major role for the acquisition of the hydrodynamic properties of t he aquifer and its karstogenesis. This stage opened all fractures and allowed t he development of karstic drains with NW-SE and N-S directions. Finally, the karstic network was shaped by more recent climatic and tectonic events.
Trapping and mobilisation of arsenic and lead in former mine tailings –Environmental conditions effects
Authors: Courtin-Nomade Alexandra , Neel Catherine , Bril Hubert , Davranche Mélanie 
Published: June 2005

Abstract
Tailings of two former mines located in the French Massif Central (La Petite Faye in Creuse Dpt. and Enguialès in Aveyron Dpt.) were studied in order to forecast the mobility of arsenic and others metallic trace elements (MTE) resulting from sulphides oxidation. Arsenic and MTE could potentially be toxic as a contamination in the sediments, soils, waters…The formation of new products resulting from the alteration processes is especially interesting because of the abilities of these products to trap these metals or metalloids. We have focussed our study on the alteration products in order to determine their role in the immobilisation of arsenic and others MTE. The two selected sites present closed Eh-pH conditions (acidic and oxidant). Nevertheless La Petite Faye site display less leaching than in the site of Enguialès due to its layout: the tailings in the former site are disposed in a settling basin whereas in the latter one, they are spread out on a steep slope. After a chemical and mineralogical characterisation of the tailings, we have estimated according to the Eh-pH conditions the solubilities of the various secondary products. In both sites, the hydrochemical study (for la Petite Faye) and laboratory experiments (for Enguialès) highlight the presence of mineralogical products with low solubility in the current geochemical conditions. At la Petite Faye, scorodite and beudantite mainly ensure an efficient trapping of As and Pb. These two minerals are stable for acidic and oxidant conditions, even if scorodite is more sensitive to pH variations and could transform into goethite. The low As (&lt; 0,1 mg.L−1) and Pb (under detection limit) concentrations measured in the water table along the six-months hydrological study confirm this previous result. In Enguialès, high quantities of As are trapped in amorphous products (Fe/As ~ 1.7). Subsequently As is more easily remobilised and is trapped secondarily by goethite, hematite or jarosite but in few quantities in comparison with those observed in amorphous products (1.4 wt.% &lt; As &lt; 3.5 wt.%). This releasing is highlighted by the leaching experiments, which indicate a significant remobilisation of As issued from amorphous products. However, in current conditions, the properties of the iron oxyhydroxides or of the iron sulphate ensure an efficient As trapping.
The different behaviours of the trapping of As and Pb in the two sites are mainly explained by the hydrological context, the tailings layout, their granulometry and the cristallinity of the secondary products.
Evidence of flexural extension of the Rif foreland: The Rharb-Mamora basin (northern Morocco)
Authors: Zouhri Lahcen , Lamouroux Christian , Vachard Daniel , Pique Alain 
Published: June 2005

Abstract
The Rharb-Mamora basin is the foreland of the Rif Cordillera (orogenic belt). The Mamora area (northern Morocco) is located at the southern border of the Rharb basin and intercalated between the Alpine Rif Mountains to the north and the Hercynian Moroccan Meseta domain to the south.
Analysis and interpretation of seismic lines, hydrogeological and oil wells, have allowed to precise the major structural elements of the Mamora area, which is covered by late Neogene sediments.
The structure of the area is controlled by faults that also affect the Paleozoic basement. The NE-SW and NW-SE trending faults induce the palaeogeographical evolution and control, the facies distribution and the thickness variations. The most important or relevant structural feature of the Mamora area is the Kenitra-Sidi-Slimane fault (K2SF) [Zouhri et al., 2001]. This fault N110oE trending is south of the Rif Alpine thrust front and is marked by a progressive deepening of its northern compartment, at least since Cretaceous time. Thus the Mamora appears as a hinge between the Rharb Basin and the Moroccan Meseta from Cretaceous to Neogene time.
Prominent facies from the Lower/Middle Cambrian of the Dead Sea area (Jordan) and their palaeodepositional significance
Authors: Elicki Olaf , Schneider Jörg , Shinaq Rafie 
Published: June 2005

Abstract
New carbonate facies types are reported from the Cambrian Burj Fm. (Bilbilian) of the southern Dead Sea area (Jordan). They indicate the existence of a large low energy lagoon, with restricted water circulation and higher salinity, behind a high energy oolite shoal or shoal complex (back-barrier system). The transition between shoal and lagoon is marked by the interfingering of sediments from both environments, caused by washover events from the shoal into the lagoon behind. The lagoon itself was characterized by a low sedimentation rate and entire bioturbation. In a shoreward direction, the lagoonal facies changed into a microbial-dominated tidal or sabkha flat environment from which sediments were periodically reworked and redeposited into the lagoon. Comparison of our results with investigations of subsurface Cambrian deposits in southeastern and northern Jordan shows that lagoonal environments were the predominant carbonate production centres in this area during the short marine phase in the Cambrian of the Dead Sea area.
Implications of Gondwana glaciations in the Baltic late Ordovician and Silurian and a carbon isotopic test of environmental cyclicity
Authors: Kaljo Dimitri , Martma Tõnu , Männik Peep , Viira Viive 
Published: June 2005

Abstract
Four glaciations – the extensively studied Hirnantian episode and three in the Llandovery-earliest Wenlock –are well established on the Gondwana palaeocontinent. New data [Hamoumi, 1999] shift the beginning of the glacial epoch to the early Caradoc when Baltica was moving from middle to low latitudes of the southern Hemisphere. Despite the rather considerable distance between polar areas of Gondwana and subtropical Baltica all four glacial events are reflected via global climatic mechanisms in the East Baltic. It is generally accepted that glaciations are marked by positive excursions of δ18O and δ13C values caused by increase of the polar ice caps, bioproduction and decrease of oceanic water temperature, etc. Based on these relationships, the Gondwana glacial events are correlated with coeval isotopic shifts established in sections of Baltica. In addition, agreement of the oceanic processes and corresponding carbon isotopic trends predicted by Jeppsson [1990] to real measured values is analysed.
The following positive δ13C excursions are recorded in the Baltic area (peak values in parentheses) : middle Caradoc (2.2 ‰), early Ashgill (2.5 ‰), Hirnantian (6 ‰), early Aeronian (3.7 ‰), early Telychian (2.7 ‰), early Wenlock (5.2 ‰). Most of these shifts correlate well with glacio-eustatic sea level lowstands and biodiversity changes, as shown by the most extensive Oandu crisis in the Caradoc, Hirnantian mass extinction and the Wenlock Ireviken Event.
Analysis of data allows the following conclusions : (1) all four Gondwana glaciations identified by tillites, microconglomeratic clays, etc. and dated biostratigraphically are recognised in the Baltic area through clear positive carbon isotope excursions at the same levels; (2) three smaller carbon isotope excursions in the Caradoc and Ashgill together with algal abundance data suggest the presence of several colder climate episodes during the late Ordovician. This may support the idea of the earlier onset of the glacial epoch on Gondwana; however, correct biostratigraphic dating of supposed glacial sediments is required; (3) the carbon isotopic testing of the oceanic model by Jeppsson reveals too many contradictions between model predictions and measured values. This means that the environmental background of isotopic events and relationships with oceanic events should be revised ; (4) for delimitation of the climatic –oceanic episodes, a more general marker identifying environmental change via a basinal approach seems useful. For this purpose lithological, geochemical or palaeontological criteria can be used.
Crassiangulina variacornuta sp. nov. from the late Llandovery and its bearing on Silurian and Devonian acritarch taxonomy
Authors: Wauthoz Bastien , Dorning Ken J. , Le Hérissé Alain 
Published: June 2005

Abstract
Crassiangulina variacornuta sp. nov., a new distinctive species of acritarch, with a short stratigraphical range within the Telychian (Silurian), is recorded from low latitude areas of Balonia (Belgium, England and Sweden) and from high latitude areas of Gondwana (Algeria, Brazil, Libya and Saudi Arabia). Therefore, the new species has good potential to be an international biostratigraphic marker for the Upper Llandovery. It has so far only been recorded in depositional environments where the sediments settled below storm wave base. The genus Crassiangulina Jardineet al., 1972 is emended to incorporate the new species and to include triangular and other polygonal acritarchs with solid processes. The emended genus includes the type species Crassiangulina tesselita Jardineet al., 1972 emend., C. grotesca Crameret al. 1976 comb. nov. et emend. and C. variacornuta sp. nov. A biometric study of 138 specimens of C. variacornuta sp. nov. from two sections in England and one section in Belgium and its statistical treatment show the biological consistency of the studied population and point to differences between the mean measurements between the sections, because of taphonomic or environmental factors. This emphasises the need to unravel the morphological variations of acritarch species along the genotypic, ecophenotypic, chronotypic and taphonotypic axes of morphological variability.
Geological and petrologic evolution of Huahine island (Society archipelago, French Polynesia) : an unusual intraoceanic shield volcano
Authors: Legendre* Christelle , Maury René C. , Guillou Hervé , Cotten Joseph , Caroff Martial , Blais Sylvain , Guille Gérard 
Published: June 2005

Abstract
Huahine (Leeward Islands, Society Archipelago) is composed of two islands, Huahine Nui and Huahine Iti, separated by the shallow Port Bourayne and Maroe bays and surrounded by a common lagoon. The two islands, however, belong to a single basaltic and trachybasaltic shield volcano, the emerged part of which was constructed during a very short period, between 2.65 and 2.52 Ma. The volcano is made of composite basaltic flows belonging to three distinct petrogenetic types, which derive from low degrees of partial melting of heterogeneous mantle sources. This building stage lead to the formation of a central caldeira. Then, a WSW-ENE trending graben formed separating Huahine Nui from Huahine Iti. As a consequence, Huahine differs from most of the other Polynesian islands which display large collapse structures opened toward the sea. After a period of inactivity of at least 0.25 m.y., magmatic activity resumed, leading to the emplacement of five trachyphonolitic intrusions along N-S trending deep regional fractures. These lavas, which do not result from the fractional crystallization of the shield basalts, are considered as derived from the melting of a deep intrusive network of dykes.
Schistes lustrés from Corsica to Hungary : back to the original sediments and tentative dating of partly azoic metasediments
Authors: Lemoine Marcel 
Published: June 2005

Abstract
The Alpine and Corsican Schistes lustrés (SL) are nearly azoic Jurassic-Cretaceous metasediments often associated with ophiolites. They are derived from both the vanished Valais (N-Penninic) and Piemont-Ligurian (S-Penninic) oceans and from their continental margins.
Their age is generally poorly known. Because of fossils discovered by Alb. Heim and by S. Franchi at the beginning of the 20th century, they were believed for a long time to be mostly Liassic in age. We know now that the major part of the SL is Cretaceous.
Deep-sea sediments, and particularly the SL, are made up of a hemipelagic-pelagic background (HPB) associated with detrital components of local or distant origin. The nature of the HPB, mostly conditioned by Tethyan and worldwide events, is of great help as an at least rough stratigraphic marker ; in contrast, detrital material is not a reliable marker because it may occur at different times in different places. The HPB exhibits several successive, 10 to 40 m.y. long episodes which are either predominantly argillaceous (A) or calcareous (C). During the deposition of the Juras-sic-Cretaceous SL, seven episodes can be distinguished : C1, calcareous Liassic ; A1, marly Upper Liassic ; C2, calcareous latest Liassic and early Dogger ; A2, shaly or radiolaritic late Dogger-early Malm ; C3, calcareous late Malm ; A3 shaly or marly early Cretaceous ; C4 calcareous late Cretaceous. They can be recognized, each one by its prevailing lithology, and all together by their succession in order from C1 to C4. Nearly all of these subdivisions are here and there dated by rare fossils, which allow for a rough dating of the numerous azoic SL series.
As they exhibit very different lithologies, from pelagic calcareous oozes to Black Shales and various kinds of flysch and other mass flow deposits, the SL cannot be considered as a specific, well-defined facies : they are not characteristic for a particular stage of the geodynamic evolution of the Alps.
Finally, a possible influence of worldwide events is suggested. First, the role of the depth of the CCD, governed by early late Jurassic and early late Cretaceous biotic recoveries. Secondly, the correlation with first order eustatic events : transgressions on platforms seem to be roughly coeval with A episodes in the deep sea, regressions with C episodes.
Late Ordovician environmental changes in Carnic Alps and central Nevada : a comparative study
Authors: Berry William B.N. 
Published: June 2005

Abstract
Correlation of the late Ordovician stratigraphic and faunal successions in the Carnic Alps, which lay in a mid-latitude site at the time, with those in Nevada, which was in the tropics at the time, reveal certain similarities. During much of the late Ordovician glacial interval, deep shelves in both areas were sites of carbonate debris flow accumulations. The debris was derived from inner or shallow shelf environments. Karst topographies developed in inner or shallow shelves in both areas during the later phase of glaciation and sea level drawdown. A quartz sand spread widely at the end of the glacial interval on deep shelf-slope environments in both areas. Perhaps coincidently, shelves in both areas were uplifted and exposed by tectonism after the late Ordovician glacial episode.
First occurrence of a gigantic pliosaurid plesiosaur in the late Jurassic (Kimmeridgian) of Mexico
Authors: Buchy Marie-Céline , Frey Eberhard , Stinnesbeck Wolfgang , López-Oliva José Guadalupe 
Published: June 2005

Abstract
Reinvestigation of a partial vertebral column from the Kimmeridgian La Caja Formation of Mexico, housed in the University of Linares (Mexico), and previously attributed to a dinosaur, proves to be from a very large pliosaurid plesiosaur. This specimen represents the first plesiosaur described from the Jurassic of Mexico. Its length has been estimated at 15 metres and, as a juvenile, is considered to be one of the largest Jurassic marine reptiles. The remains of this animal are here described. The morphology of the vertebral column is not diagnostic beyond family level. Large pliosaur vertebrae of a similar size are known from the Upper Jurassic of Europe, and are often referred to the genera Liopleurodon or Simolestes but these identifications are based only upon the size of the centra and have no taxonomic justification. A portion of rostrum with teeth was discovered together with the vertebral column but is unfortunately now lost. The Mexican pliosaur fills geographical and chronological gaps between western Tethys and South American pliosaurs, and is an additional support to the hypothesis of a Hispanic corridor linking at least temporarily the NW European marine province with the western South American marine (Pacific) realm during the late Jurassic.
The branchiosaurid amphibians from the Lower Permian of Buxières-les-Mines, Bourbon l’Archambault Basin (Allier, France) and their biostratigraphic significance
Authors: Werneburg Ralf 
Published: June 2005

Abstract
Branchiosaurs are rare in the lacustrine fauna from the Lower Permian of Buxières-les-Mines (Massif Central, France). All known specimens belong to Melanerpeton gracile, which is significant for the Melanerpeton gracile-Discosauriscus pulcherrimus zone in the biostratigraphical zonation of Upper Carboniferous and Lower Permian based on aquatic amphibians. This branchiosaurid species support the Asselian age (uppermost Lower “Autunian”/Rotliegend) of the Assise de Buxières in the Bourbon l’Archambault Basin (Allier, France).
Analysis of the postglacial deposits of the Rhône shelf (golfe du Lion). Implementation to the study of the late Quaternary depositional sequences
Authors: Gensous Bernard , Tesson Michel 
Published: June 2005

Abstract
Postglacial deposits of the Rhône shelf have been studied from high-resolution seismic data and Kullenberg piston cores. They are organised into a set of transgressive units or parasequences backstepping from the outer shelf to the subaerial deltaic plain. On the deltaic plain, they are overlain by the prograding deltaic parasequences deposited at the end of the Holocene sea level rise.
At regional scale, given the short time span covered by the late Quaternary deposits, tectonic subsidence has played a minor role and sediment deposition on the Rhône shelf was chiefly controlled by glacio-eustatic sea level changes (120 m between the maximum lowstand and present highstand). Progradational phases correspond to periods of reduced rate of eustatic sea level rise while the flooding surfaces bounding the regressive units form during periods of increasing rate of sea level rise and landward shoreline migration.
At local scale, location, geometry, nature of deposits, and lateral variations of the stratigraphic pattern are controlled by the interaction between eustasy and local factors as sediment supply, antecedent morphology and ocean dynamics.
Seaward of the Rhône river, terrigenous input was important during deglaciation and transgressive deposits extend continuously from the outer shelf to the inner shelf along the retreating path of the paleo-Rhône river mouth. Laterally, on either side of the Rhône incised valley, because of the reduced sediment supply, parasequences only develop on the outer shelf and inner shelf : the combination of the very low inherited gradient of the mid/outer shelf and a very high rate of sea level rise favoured a very rapid migration of the shoreline from outer to inner shelf.
Ocean dynamics has been controlled, as in present time, by the E to SE prevailing waves that are the only ones which can develop on an extended fetch. The westward alongshore drift accounted for the development of parasequences west of the incised valley. The sandy material needed for the construction of the outershelf parasequence was supplied by wave-reworking and westward long-shore drift of deposits from the Rhône delta front and the uppermost forced regressive unit.
The decreasing sand content of parasequences from outer shelf to inner shelf results from flattening of the equilibrium river profile that led to a decrease in competence and a change in the character of the sediment caliber (relative increase of suspension load).
The underlying Pleistocene depositional sequences comprise both lowstand prograding units, that characterize most of the Mediterranean shelves, and intercalated units which are analogs of the postglacial transgressive deposits here presented.
First rebbachisaurid dinosaur (Sauropoda, Diplodocoidea) from the early Cretaceous of Spain : palaeobiogeographical implications
Authors: Suberbiola Xabier Pereda , Torcida Fidel , Izquierdo Luis Angel , Huerta Pedro , Montero Diego , Pérez Gustavo 
Published: June 2005

Abstract
Sauropod remains from the early Cretaceous (late Barremian–early Aptian) of Salas de los Infantes (Burgos, Spain) are described. The material consists of several caudal vertebrae, chevrons, a pair of ischia and a femur that is presumed to belong to a single medium-sized individual. Based on the tall neural arches and broad neural spines of the anterior caudal vertebrae, the specimen is referred to the Diplodocoidea. Moreover, it shows affinities with the Rebbachisauridae, a basal clade of diplodocoids. Both the caudal vertebrae and ischium of the Burgos sauropod are similar in form to those of ‘Rebbachisaurus’ tessonei from the Albian-Cenomanian of South America. However, there are some differences with regard to this taxon, so the Burgos sauropod is provisionally referred to as Rebbachisauridae in-det. Rebbachisaurids are known in the Aptian-Cenomanian of the western Gondwanan landmasses (Africa and South America), although further remains have been reported from the Coniacian-Santonian of Argentina and the Hauteri-vian–Barremian of Croatia. The Burgos diplodocoid appears to be one of the earliest representative of the Rebbachisau-ridae. This discovery supports previous evidence of a land connection between Europe and Africa across the Tethys seaway sometime in the early Cretaceous.