Siberian river run-off and Late Quaternary glaciation in the southern Kara Sea, Arctic Ocean: preliminary results   总被引：3，自引：0，他引：3  

Ruediger Stein  Frank Niessen  Klaus Dittmers  Michael Levitan  Frank Schoster  Johannes Simstich  Tatjana Steinke  Oleg V. Stepanets 《Polar research》2002,21(2):315-322

The extent of the Barents-Kara Ice Sheet during the eastern Last Glacial Maximum (LGM) is not yet fully known. A detailed echo-sounding survey performed during the Boris Petrov Expedition 2001 permitted the detailed mapping of part of it. Based on the profiling results, a southern connection between the LGM Barents-Kara Ice Sheet and a local ice sheet on Taymyr Peninsula appears to be unlikely. Based on sediment core data and profiling results, most of the terrigenous river-derived material accumulated in the estuaries during late Holocene times, whereas during early Holocene times of lowered sea level major amounts were transported further offshore and accumulated on the shelf. During the post-glacial sea level rise, the main depocentre migrated southward, reaching its present position no earlier than about 6 cal. Ky BP (or 5.2 Kya). Future studies of accelerator mass spectrometry (AMS) ¹⁴C-dated sediment cores will allow a detailed reconstruction of the variability of fluvial sediment discharge and the history of glaciation in the Kara Sea during late Quaternary times.  相似文献   

Finite-difference modelling of two-dimensional elastic wave propagation in cracked media     

Vincent A. van Antwerpen  Wim A. Mulder  Gérard C. Herman 《Geophysical Journal International》2002,149(1):169-178

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Data and model uncertainty estimation for linear inversion   总被引：1，自引：0，他引：1  

Kasper van Wijk  John A. Scales  William Navidi  Luis Tenorio 《Geophysical Journal International》2002,149(3):625-632

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Alpujarride attribution of the supposed ‘Almagride Complex’ (Betic Internal Zone,Almerı́a Province,Spain)Appartenance Alpujarride du prétendu « Complexe almagride » (Zones internes bétiques,province d'Almeria,Espagne)     

Carlos Sanz de Galdeano  Francisco J Garcı́a Tortosa 《Comptes Rendus Geoscience》2002,334(5):355-362

The differentiation of units in the Sierra de Almagro has been a source of controversy. There were defined the Almagride and Ballabona–Cucharón complexes, the former considered by several authors as part of a Subbetic metamorphosed and outcropping in a tectonic window. In this study, the units of Ballabona, Almagro and Cucharón are integrated into a single one, that of Tres Pacos, because they correspond to different parts of the same stratigraphic series. This unit is tectonically over the Nevado–Filabride Complex. The existence of the Almagride and Ballabona–Cucharón complexes is discarded and their units form part of the Alpujarride Complex. To cite this article: C. Sanz de Galdeano, F.J. Garc??a Tortosa, C. R. Geoscience 334 (2002) 355–362.  相似文献   

Le Bassin lusitanien (Portugal) à l'Aptien supérieur–Albien : organisation séquentielle,proposition de corrélations, évolutionThe Lusitanian Basin (Portugal) during the late Aptian–Albian: sequential arrangement,proposal of correlations,evolution     

Jorge Dinis  Jacques Rey  Pierre-Charles de Graciansky 《Comptes Rendus Geoscience》2002,334(10):757-764

. Three transgressive–regressive 2nd-order cycles were identified in the Upper Aptian–Albian fluvial and marine deposits of the Lusitanian Basin. Its widespread nature, probably including eustatic origin, allows correlation between the southern package, with precise stratigraphic positioning, and the northern series with a poorly constrained age. The main unconformities can be related to the onset of an oceanic crust, in the western margin of Galicia during the Late Aptian, in the bay of Biscay during the Early Albian, and, to the northwest of the Galicia triple point, during the Middle to Late Albian transition, and, at the Albian–Cenomanian boundary, to a probable compressive event with Africa due to the rotation of Iberia. To cite this article: J. Dinis et al., C. R. Geoscience 334 (2002) 757–764.  相似文献   

Patch use and exploratory movements of a resident houbara bustard in northern Saudi Arabia     

Yolanda van Heezik  Philip J. Seddon 《Journal of Arid Environments》2002,50(4):683

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The rate of grain release by pore-ice sublimation in cold-aeolian environments   总被引：1，自引：0，他引：1  

Deanna van Dijk  Jane Law 《Geografiska Annaler: Series A, Physical Geography》2003,85(1):99-113

Pore‐ice sublimation is a prerequisite for aeolian activity in cold environments where surface sediments hold significant amounts of frozen water. Few quantitative studies have defined the rate of grain release from cemented surfaces by pore‐ice sublimation. In 1996–1997, controlled field experiments at Presqu'ile Beach, Ontario, were implemented to measure sediment release from frozen surfaces. The release rates were compared to the local wind regime, ambient temperature and humidity. In additional field experiments, the effect of sediment water content on grain release by sublimation was examined. From the experimental results, an equation which predicts grain release based on local wind speed, ground temperature, humidity, and surface water content is proposed. Predicted release rates show reasonable agreement with natural deflation measured on the beach at Presqu'ile Provincial Park.  相似文献   

Shear wave statics using receiver functions   总被引：1，自引：0，他引：1  

D. van Manen  J. O. A. Robertsson  A. Curtis  R. Ferber  H. Paulssen 《Geophysical Journal International》2003,153(3):F1-F5

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Joint inversion of local, regional and teleseismic data for crustal thickness in the Eurasia–Africa plate boundary region     

Federica Marone  Mark van der Meijde  Suzan van der Lee  Domenico Giardini 《Geophysical Journal International》2003,154(2):499-514

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Size and geometry of microearthquake seismic ruptures from P and S pulse width data     

Salvatore de Lorenzo  Aldo Zollo 《Geophysical Journal International》2003,155(2):422-442

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