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101.
Two geomagnetic reversals(R→N followed by N→R) have been recorded in a sequence of Miocene marine clays of Tortonian-Messinian age in western Crete (Greece). The time span of each transition is found to be of the order of 5000–10,000 years. The transitional VGP paths are largely constrained in longitude either near the site longitude(R→N) or opposite to it(N→R). A normalized magnetization intensity record has also been obtained and its variations during reversals are found to be in excellent agreement with the predictions of Hoffman's phenomenological model. 相似文献
102.
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
103.
David Besson Olivier Parize Jean-Loup Rubino Jean-Pierre Aguilar Marie-Pierre Aubry Bernard Beaudoin William A. Berggren Georges Clauzon Philippe Crumeyrolle Yann Dexcoté Nicolas Fiet Silvia Iaccarino Gonzalo Jiménez-Moreno Cécile Laporte-Galaa Jacques Michaux Katharina von Salis Jean-Pierre Suc Jean-Yves Reynaud Roland Wernli 《Comptes Rendus Geoscience》2005,337(12):1045-1054
An integrated study combining facies analysis, multiple group biostratigraphy, identification of depositional sequences and mapping has been conducted on the Miocene Molasse Basin of the external Alps (southeastern France). The filling of the basin is described as resulting from a succession of fluvial incisions subsequently filled during marine transgressions. The major incision is dated as Latest Burdigalian and the major transgression as Langhian. This revised interpretation of the Miocene physiographic evolution of the Molasse Basin implies a re-examination of previous stratigraphic correlations within the basin. To cite this article: D. Besson et al., C. R. Geoscience 337 (2005). 相似文献
104.
Modes of thickening of analogue weak lithospheres 总被引:4,自引:2,他引:4
Several compressional contexts, such as those involving juvenile or thickened crust, are expected to be associated with rather hot lithospheres whose mechanical behaviour remains poorly documented. In this paper, we present a series of analogue models dedicated to compression of lithospheres characterized by a thin upper brittle crust overlying a weak ductile crust and a ductile sub-Moho mantle. The models show that (1) deformation is controlled by the ductile layers that undergo distributed thickening, (2) thrust systems are limited to the upper brittle crust, (3) thrusting induces burial and stacking of upper crust pop-downs. The overall deformation patterns can be basically interpreted in terms of pop-down thrusting of the brittle crust and pure-shear type ductile flow of crust and mantle. Moreover, the models show that the sinking of supracrustal units does not require inverse density profiles but can be simply driven by compression. Model deformation patterns are consistent with those shared by many ancient belts, including not only Archaean granite–greenstone belts, but also more generally Paleoproterozoic ones. They provide also insights on deformation modes that may characterize modern thickened and abnormally hot domains like High Plateaus. 相似文献
105.
Offneria arabicanov. sp. (rudiste, Caprinidae) est caractérisé par la simplicité de l'architecture de la valve supérieure, bien exprimée par la forme subrectangulaire des canaux où les planchers sont relativement rares, et le faible développement des tabulae. La valve inférieure est beacoup plus complexe, ce qui traduit un taux d'evolution différencié des deux valves. L'espèce a été) trouvée dans l'Aptien inférieur (Formation Shuaiba) du Jebel Madar, dans l'avant pays des nappes des Montagnes d'Oman. Son organisation la rattache au groupe des formes arabo-africaines. A côté de ses caractères évolutifs, elle est intéressante par son potentiel biostratigraphique et paléobiologéographique.
Abstract
Offneria arabicanov. sp. (rudist, Caprinidae) is characterized by the simplicity of the upper valve, well expressed by the subrectangular shape of the canals where horizontal partitions are relatively rare, and the weak development of the tabulae. The lower valve is far more complex, which means distinctive evolutionary rates for the two valves. The species was found in the Lower Aptian (Shuaiba Formation) of the Jebel Madar, in the foreland of the Oman Mountain nappes. By its overall organisation it belongs to the Arabo-African group of species. Besides its evolutionary characters this form is interesting because of its biostratigraphic and palaeobiogeographic potential. 相似文献106.
Agnès Acker Jean-Pierre J. Lafon Anthony F.J. Moffat 《Astrophysics and Space Science》1998,260(1-2):273-273
107.
108.
Hiroshi Karoji Laurent Nottale Jean-Pierre Vigier 《Astrophysics and Space Science》1976,44(1):229-234
A sample of 41 radio-galaxies with 13.0m
corr15.5 has been analyzed to test the angular redshift anisotropy discovered on Sc I galaxies by Rubin, Rubin and Ford. The sample does not present their anisotropy but contains an even more curious distribution of radial velocities which suggests that the Rubin-Ford effect results from an anomalous redshift of light when it travels through clusters of galaxies. 相似文献
109.
Schürch Marc Kozel Ronald Schotterer Ulrich Tripet Jean-Pierre 《Environmental Geology》2003,45(1):1-11
The Swiss National Network for the Observation of Isotopes in the Water Cycle (NISOT) includes eleven precipitation, seven surface water (river) and three groundwater stations, where tritium, deuterium and oxygen-18 are monthly measured in composite samples. The network provides a good overview of the characteristic isotope signatures in recharge waters in Switzerland and of the relations between isotopes and altitude, orography and the amount of precipitation. Mixing of air water vapour and surface waters can be observed along a NW/SE cross section through the Alps. With increasing length of the data series, the network provides a valuable contribution for national and international scientific and practical applications in surface and subsurface hydrology, climatology and biology. The Swiss Geological Survey at the Federal Office for Water and Geology operates the isotope network within the legal framework of the Federal Law on the Protection of Waters and guarantees quality, access and distribution of the isotope data. 相似文献
110.
Mohammed Jaffal Azzouz Kchikach Jean-Pierre Lefort Lahoucine Hanich 《Comptes Rendus Geoscience》2002,334(4):229-234
A large number of seismic reflection lines and boreholes have been carried out in the Essaouira Basin by the oil industry. The present study concentrates on the reinterpretation of these data in the restricted area of Khemis Meskala, in order to better characterise the structure of the Cretaceous aquiferous system. The reflector corresponding to the bottom of the Vraconian formation has been identified on the different seismic sections. This horizon, which marks the base of the aquiferous system, was first digitised on time migration sections and then converted to depth sections using a suitable linear velocity law. The isobath map of the bottom of the Vraconian resulting from this study images the 3D geometrical structure of this horizon and shows that it is slightly folded in domes and basins. This document will be useful for rationalising the future hydrogeological researches that will be undertaken in the Khemis Meskala area. To cite this article: M. Jaffal et al., C. R. Geoscience 334 (2002) 229–234. 相似文献