Erratum to: Towards a More Equitable Use of Mineral Resources     

Patrice Christmann 《Natural Resources Research》2018,27(2):179-180

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La discrimination géotectonique des roches magmatiques basiques par les éléments traces. Réévaluation d’après une base de données et application à la chaîne panafricaine du Togo.     

D. ThiÈblemont  P. ChÈvremont  C. Castaing  C. Triboulet  J.L. Feybesse 《Geodinamica Acta》2013,26(3):139-157

Résumé

Nous confirmons, par l’utilisation d’une base de données géochimiques sur un très grand nombre de roches magmatiques actuelles ou récentes ordonnées selon des critères géotectoniques rigoureux, la validité de la démarche de discrimination géotectonique, par les éléments traces, pour des laves et plutons contenant moins de 55% de Si0₂. Nous précisons les limites des champs discriminants, dans le diagramme Th-Tb-Ta, et montrons leur position non aléatoire vis à vis du point représentatif du Manteau Primordial, chaque contexte pouvant être caractérisé par un mode de fractionnement particulier des systèmes Th-Ta et Tb-Ta. Ceci suggère que la discrimination géotectonique reflète à la fois l’hétérogénéité des sources des magmas et la permanence des caractères de la (des) source(s) dans un contexte donné. Cette démarche est appliquée à une quinzaine de métabasites (amphibolites et éclo-gites) échantillonnées lors d’une campagne de cartographie de la chaîne panafricaine du Togo et supposées représentatives de différentes unités lithostructurales. Par leurs caractéristiques géochimiques, ces échantillons s’apparentent aux basaltes associés au système Afar/Mer Rouge ou aux tholéiites continentales. Aucun ne présente les signatures géochimiques des laves émises en contexte de convergence de plaques ou des basaltes de rides médio-océa-niques “normales” (“N-type MORB”). Ces résultats suggèrent la mise en place du magmatisme préorogénique dans un contexte de rift continental mais n’apportent pas d’argument en faveur de la résorption d’un vaste domaine océanique dans cette partie de la chaîne panafricaine.  相似文献   

Jurassic and Cretaceous radiolarian assemblages from the Bornova mélange in northern Karaburun Peninsula (western Turkey) and its connection to the İzmir–Ankara mélanges     

Patrice Moix  Špela Goričan 《Geodinamica Acta》2013,26(1-2):56-67

Two large blocks of red bedded chert identified within the Late Cretaceous–Paleocene Bornova mélange in northern Karaburun Peninsula yielded Jurassic (late Bathonian–early Oxfordian) and Cretaceous (middle–late Albian) radiolarian assemblages. These new data confirm the correlation of the Bornova mélange with the Bornova Flysch Zone (BFZ) and the ?zmir–Ankara mélanges. A review of all previously obtained ages in chert blocks of the BFZ and the ?zmir–Ankara mélanges is provided in order to strengthen this correlation.  相似文献   

Reconstruction of the upper ocean 3D dynamics from high-resolution sea surface height     

Aurelien L. Ponte  Patrice Klein 《Ocean Dynamics》2013,63(7):777-791

The present study investigates the reconstruction of the 3D dynamics of a turbulent mesoscale eddy field driven at a depth by a baroclinic instability of the Phillips type. It uses a high-resolution primitive equation simulation as a testbed. The method of reconstruction is based on potential vorticity principles and extends an earlier approach (Lapeyre and Klein, J Phys Oceanogr 36:165–176, 2006) to a regime where the signature of surface density anomalies on the dynamics is weak. The crux and the originality of the reconstruction lie in the estimation from sea surface height and surface density anomalies of the interior quasigeostrophic potential vorticity (PV) anomalies and its subsequent inversion. The estimation of PV anomalies relies on the vertical correlation between PV anomalies and on the knowledge on stratification and horizontal gradients of background PV. PV anomalies are accurately estimated over the first 500 m of the water column and over a wide range of wavenumbers. Density anomalies play a minor role in the PV estimation, though their omission leads to an overestimation of PV by a factor of less than 2 at scales of order 20 km and less. Inversion of the estimated PV leads to a geostrophic streamfunction which in turn provides reliable reconstructions of the relative vorticity and vertical velocity (via the omega equation).  相似文献   

Polarization in the young cluster NGC 6611: circumstellar, interstellar, or ... both?     

Pierre Bastien  François Ménard  Patrice Corporon  Nadine Manset  Frédérick Poidevin  Gaspard Duchêne  Jean-Louis Monin 《Astrophysics and Space Science》2004,292(1-4):427-433

We obtained linear polarization observations of 82 A/B-type stars in the young cluster NGC 6611, in order to probe the circumstellar material and to search for any evidence of intracluster or interstellar material that could also contribute to the polarization. We found linear polarization values that reach up to 14%. We consider the distribution of the polarization, its position angle, correlations with extinction and membership probability, polarization variability and wavelength distribution to identify the origin of the polarization toward NGC 6611. The polarization is found to be dominated by interstellar polarization, although some stars also have some circumstellar polarization. There is no evidence for intracluster dust. Rather, the dust must be located in a low density cloud toward the general line of sight to NGC 6611 and in front of it. The depth of that cloud along the line of sight increases slowly from the south–east to the north–west. The cloud is threaded by a very uniform magnetic field.  相似文献   

Geometric Effect of Asperities on Shear Mechanism of Rock Joints     

Ali Fathi  Zabihallah Moradian  Patrice Rivard  Gérard Ballivy  Andrew J. Boyd 《Rock Mechanics and Rock Engineering》2016,49(3):801-820

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Climate change and warm‐water species at the north‐western boundary of the Mediterranean Sea          下载免费PDF全文

Valeriano Parravicini  Luisa Mangialajo  Laure Mousseau  Andrea Peirano  Carla Morri  Monica Montefalcone  Patrice Francour  Michel Kulbicki  Carlo Nike Bianchi 《Marine Ecology》2015,36(4):897-909

The effects of global change are particularly serious in areas where range shifts of species are physically constrained such as the Ligurian Sea, which is one of the coldest sectors of the Mediterranean. In this basin, historical information on water temperature (from the sea surface down to 75 m depth) dates back to the 1950s. Early studies also recorded warm‐water species occurrence. Thanks to these data we provide the first detailed characterization of water temperature variation from 1958 up to 2010 in the layer 0–75 m depth. We coupled this analysis with the available information on rocky reef epibenthic communities (literature review from 1955 to 1964 and field data from 1980 to 2010). The analysis of water temperature revealed several patterns of variation: a cooling phase from 1958 to 1980, a phase of rapid warming from 1980 to 1990 and a phase of slower warming from 1990 to 2010. Inter‐annual variation in temperature increased over the entire period for the water layer down to 20 m. Warm‐water native and alien species richness increased during the warming phases. Literature estimates suggest a decrease in warm‐water native species richness during the cooling phase. The analysis of quantitative data collected in the early 1990s and late 2000s indicated a decrease in the cover of warm‐water native species on shallow rocky reefs and an increase in deeper waters. We argue that increased inter‐annual variation in water temperature may disadvantage native warm‐water species in shallow waters. Our results indicate that the effect of temperature rises in cold, constrained basins may be more complex than the simple prediction of species changing their geographical range according to their thermal limits.  相似文献   

Les ensembles fluviatiles néogènes du bassin subandin d'Équateur et implications dynamiquesThe Neogene fluvial systems of the Ecuadorian foreland basin and dynamic inferences     

Frédéric Christophoul  Patrice Baby  Jean-Claude Soula  Michel Rosero  José Burgos 《Comptes Rendus Geoscience》2002,334(14):1029-1037

A sedimentological study of the Neogene continental infill of the Subandean foreland basin of Ecuador led us to define an evolution of the fluvial system from an alluvial plain to an alluvial fan with an increasing slope in the same time as the drainage changed from mostly longitudinal to transverse. Combined with the data presently available on palaeotopography, exhumation, tectonic evolution and geomorphology, these results enable us to infer that, in contrast with the other Subandean foreland basins of Bolivia and Peru, the progradation of the Neogene alluvial fans proceeded by an overall expansion, associated with a relatively small tectonic shortening and not as a result of the development of successive thrust-related depocentres. This also indicates that the surrection of the Cordillera progressed in Ecuador throughout the Neogene. To cite this article: F. Christophoul et al., C. R. Geoscience 334 (2002) 1029–1037.  相似文献   

The NOWESP research data base     

G. Radach  J. Gekeler  G. Becker  P. Bot  P. Castaing  F. Colijn  P. Damm  D. Danielssen  L. FØyn  J. Gamble  R. Laane  J. P. Mommaerts  D. Nehring  K. Pegler  W. van Raaphorst  J. Wilson 《Ocean Dynamics》1996,48(3-4):241-259

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Tidal frequency dynamics of a Southern Brazil coastal lagoon: Choking and short period forced oscillations     

Osmar O. Möller  Patrice Castaing  Elisa Helena Leão Fernandes  Pascal Lazure 《Estuaries and Coasts》2007,30(2):311-320

The Patos Lagoon is a choked, microtidal coastal laggon situated in southern Brazil between 30°S and 32°S. The response of the lagoon to tidal oscillations is studied through data analysis and numerical modeling experiments. Two types of high frequency oscillations are observed in the tidal frequency band: mixed tides, predominantly diurnal; and forced oscillations having a period of 24 h occurring in the inner lagoon. In the southern portion of the lagoon, tides are selectively filtered by the entrance channel. The main diurnal constituent O₁ is linearly attenuated as it progresses landwards. In the inner parts of the lagoon, 24-h oscillations are mainly forced by the combined effect of diurnal tides and sea breeze action. They are tied with a natural period of oscillation of 24 h. Results also indicate that these are not inertial frequency oscillations, despite the lagoon being placed in a critical 30°S area. The interaction between astronomical tides and meteorological effects produces a complicated picture for tidal forecasting derived from data collected inside the lagoon.  相似文献