An inverse technique for retrieving higher mode phase velocity and mantle structure   总被引：1，自引：0，他引：1  

Eléonore Stutzmann  Jean-Paul Montagner 《Geophysical Journal International》1993,113(3):669-683

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Post-modern geography or geography of the Third Modernity     

Jean-Paul Ferrier 《GeoJournal》1993,31(3):251-253

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Chemical characterization of porewaters in an intertidal mudflat of the Seine estuary: relationship to erosion-deposition cycles     

Bally G  Mesnage V  Deloffre J  Clarisse O  Lafite R  Dupont JP 《Marine pollution bulletin》2004,49(3):163-173

A seasonal field study was carried out in the Seine estuary to determine the chemistry of sediment porewaters using the 'peeper' technique and changes in the elevation of the mudflats using the 'Altus' technique. This approach allowed us to evaluate the release of nutrients and to link these releases to the sediment hydrodynamics. Our results show that nutrient and organic matter cycling in a Seine estuary mudflat exhibits a seasonal behaviour, which is mainly influenced by variations in hydrodynamics. Sediments, rich organic matter, were input during floods and they were mineralized during summer and autumn, releasing nutrients and dissolved organic carbon into the sediment porewaters. The nutrient release, including ammonium, is mainly linked to the mineralization of organic matter, while the release of phosphate is delayed. The delay could be the result of phosphate association with organic matter and/or its co-precipitation with calcium and iron.  相似文献   

Correlations and sequence stratigraphic model for Messinian carbonate platforms of the western and central Mediterranean   总被引：1，自引：0，他引：1  

Jean-Jacques?CornéeEmail author  Jean-Paul?Saint Martin  Gilles?Conesa  Philippe?Münch  Jean-Pierre?André  Simona?Saint Martin  Stefan?Roger 《International Journal of Earth Sciences》2004,93(4):621-633

Distance correlations of Late Tortonian–Messinian littoral carbonate complexes are proposed from the study of eight platforms in the western and central Mediterranean. Correlations are based on the identification of two major biological sedimentary cycles and of two index surfaces. Surface A is a maximum flooding surface during cycle 1 at around 6.7 Ma. Surface B is a regional marine planation surface at around 5.95 Ma, at the base of cycle 2 (Terminal Carbonate Complex). A general sedimentary model is proposed for the 7–5.6-Ma time-span. The boundary between cycles 1 and 2 is coincident with the onset of the Messinian Salinity Crisis, and appears to be related to major environmental–paleo-oceanographic changes in the Mediterranean, rather than to a major sea-level drop or to climatic change.  相似文献   

Monitoring coastal evolution and associated littoral hazards of French Guiana shoreline with radar images     

Hervé Trebossen  Benoît Deffontaines  Nicolas Classeau  Jacob Kouame  Jean-Paul Rudant 《Comptes Rendus Geoscience》2005,337(13):1140-1153

This paper aims at illustrating different case examples of monitoring active coastal evolutions using remote sensing synthetic aperture radar images (ERS 1–2 and Envisat) in humid tropical areas. Effectively, the radar satellite images may be acquired under most climate conditions, especially in cloudy tropical areas. As case examples, we studied herein French Guiana shoreline and its fast evolution under the combined influences of sea currents, sediments and swells. We focused on two aspects of French Guiana littoral evolution: (1) sedimentation and erosion processes linked to mud banks displacements around Kourou City, and (2) around Iracoubo village. Lastly, we compared this short-term sedimentation balance with long-term data showing the discrepancies of short- and long-term littoral evolutions on whole French Guiana. To conclude, this work demonstrates the importance of SAR imagery to provide high-quality and high-frequency update geographic information for coastal management and littoral hazards especially in such tropical humid and cloudy areas. To cite this article: H. Trebossen et al., C. R. Geoscience 337 (2005).  相似文献   

In memoriam: Henri Kampunzu (1952–2004)     

Sospeter Muhongo  Jean-Paul Liegeois  Steve McCourt  Sadrack Felix Toteu  Estella Atekwana  Patrick G. Eriksson  Marek Wendorff   《Journal of African Earth Sciences》2004,40(5):195

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First record of a non-pterodactyloid pterosaur (Reptilia: Archosauria) from Switzerland     

Jean-Paul Billon-Bruyat 《Eclogae Geologicae Helvetiae》2005,98(3):313-317

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Comparative research on integrated development of large river basins: a case study of the Yangtze and the Rhone     

LIU Hui  Jean-Paul Bravard  CAI Zongxia  Thierry Sanjuan 《地理学报》2006,16(3):378-382

Since 2001, the French and Chinese researchers have done a cooperative research on the comparison of integrated development of large river basins. The Yangtze River was chosen as a crux of this research and linked with other older river experiments like the Rhone, the Nile and the Mississippi. This research includes not only the environmental issues but also economic and social issues. One special issue journal has been published in French for our research results. Other two collective and comparative books in French and Chinese will be finished at the end of this year. In the future, the comparison should be widened to Italy (the Po), Egypt (the Nile development planning) and the United States (the Mississippi Basin) and we would like to enlarge our research group and want to link up different teams and research projects, in order to get a global understanding of large river regions phenomenon.  相似文献   

DORIS time bias estimated using Jason-1, TOPEX/Poseidon and ENVISAT orbits     

Nikita P. Zelensky  Jean-Paul Berthias  Frank G. Lemoine 《Journal of Geodesy》2006,80(8-11):497-506

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The alkaline–peralkaline granitic post-collisional Tin Zebane dyke swarm (Pan-African Tuareg shield, Algeria): prevalent mantle signature and late agpaitic differentiation     

Zakia Hadj-Kaddour  Jean-Paul Li  geois  Daniel Demaiffe  Renaud Caby 《Lithos》1998,45(1-4):223-243

The Tin Zebane dyke swarm was emplaced at the end of the Pan-African orogeny along a mega-shear zone separating two contrasting terranes of the Tuareg shield. It is located along the western boundary of the Archaean In Ouzzal rigid terrane, but inside the adjacent Tassendjanet terrane, strongly remobilized at the end of the Precambrian. The Tin Zebane swarm was emplaced during post-collisional sinistral movements along the shear zone at 592.2±5.8 Ma (19WR Rb–Sr isochron). It is a dyke-on-dyke system consisting of dykes and stocks of gabbros and dykes of metaluminous and peralkaline granites. All rock types have Sr and Nd isotopic initial ratios (Sr_i=0.7028 and _Nd=+6.2) typical of a depleted mantle source, similar to the prevalent mantle (PREMA) at that period. No crustal contamination occurred in the genesis of the Tin Zebane swarm. Even the samples showing evidence of fluid interaction (essentially alkali mobility) have the same isotopic signature. The peralkaline granites have peculiar geochemical characteristics that mimic subduction-related granites: this geochemical signature is interpreted in terms of extensive differentiation effects due to late cumulates comprising aegirine, zircon, titanite, allanite and possibly fergusonite, separated from the liquid in the swarm itself due to magmatic flow turbulence. The Tin Zebane dyke swarm is thus of paramount importance for constraining the differentiation of mantle products to generate highly evolved alkaline granites without continental crust participation, in a post-collisional setting.  相似文献