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排序方式: 共有341条查询结果,搜索用时 218 毫秒
91.
Didier Miallier Laurent Michon Jacques Évin Thierry Pilleyre Serge Sanzelle Gérard Vernet 《Comptes Rendus Geoscience》2004,336(15):1345-1353
On the basis of radiocarbon ages obtained on wood burned by base surges and tephrochronological observations, it has been possible to assess that the Puy Chopine, aged ca 9700 yr is older by a few centuries than both the Vasset and Kilian volcanoes. The last two have nearly the same age, ca 9300–9400 yr. Layers of trachytic tephra, most probably originated from Kilian or Vasset, can be observed overlapping those from the Pariou. This last volcano had been previously thought to be the younger of the area on the basis of the observation of trachytic tephra beneath its own tephra. However, new observations allow us to assume that those trachytes originated from the acid phase of the Pariou itself. Therefore, it can be assessed that the four volcanoes erupted according to the following sequence: Chopine/Pariou/?Vasset?/Kilian; the chronological situation of Vasset lies on poor arguments and it should be confirmed. To cite this article: D. Miallier et al., C. R. Geoscience 336 (2004). 相似文献
92.
The overall spectrum of Active Galactic Nuclei is discussed in terms of a wind and shock model. The central object of the active galactic nuclei is the source of a strong supercritical wind. The interaction of the wind with the surrounding medium generates the non-thermal radiation observed in active galactic nuclei. The spectrum predicted by the wind and shock model is compared with the observations of the quasar 3C 273. 相似文献
93.
Thierry Sempere Gabriel Carlier Pierre Soler Michel Fornari Víctor Carlotto Javier Jacay Oscar Arispe Didier Nraudeau Jos Crdenas Silvia Rosas Nstor Jimnez 《Tectonophysics》2002,345(1-4)
Integrated studies and revisions of sedimentary basins and associated magmatism in Peru and Bolivia (8–22°S) show that this part of western Gondwana underwent rifting during the Late Permian–Middle Jurassic interval. Rifting started in central Peru in the Late Permian and propagated southwards into Bolivia until the Liassic/Dogger, along an axis that coincides with the present Eastern Cordillera. Southwest of this region, lithospheric thinning developed in the Early Jurassic and culminated in the Middle Jurassic, producing considerable subsidence in the Arequipa basin of southern Peru. This 110-Ma-long interval of lithospheric thinning ended 160 Ma with the onset of Malm–earliest Cretaceous partial rift inversion in the Eastern Cordillera area.The lithospheric heterogeneities inherited from these processes are likely to have largely influenced the distribution and features of younger compressional and/or transpressional deformations. In particular, the Altiplano plateau corresponds to a paleotectonic domain of “normal” lithospheric thickness that was bounded by two elongated areas underlain by thinned lithosphere. The high Eastern Cordillera of Peru and Bolivia results from Late Oligocene–Neogene intense inversion of the easternmost thinned area. 相似文献
94.
Thierry Dumont Jean-Daniel Champagnac Christian Crouzet Philippe Rochat 《Swiss Journal of Geoscience》2008,101(1):89-110
Three-dimensional modelling tools are used with structural and palaeomagnetic analysis to constrain the tectonic history of part of the Dauphiné zone (external Western Alps). Four compressive events are identified, three of them being older than the latest Oligocene. Deformation D1 consists of W–SW directed folds in the Mesozoic cover of the study area. This event, better recorded in the central and southern Pelvoux massif, could be of Eocene age or older. Deformation D2 induced N-NW-oriented basement thrusting and affected the whole southern Dauphiné basement massifs south of the study area. The main compressional event in the study area (D3) was WNW oriented and occurred before 24 Ma under a thick tectonic load probably of Penninic nappes. The D2-D3 shift corresponds to a rapid transition from northward propagation of the Alpine collision directly driven by Africa-Europe convergence, to the onset of westward escape into the Western Alpine arc. This Oligocene change in the collisional regime is recorded in the whole Alpine realm, and led to the activation of the Insubric line. The last event (D4) is late Miocene in age and coeval with the final uplift of the Grandes Rousses and Belledonne external massifs. It produced strike-slip faulting and local rotations that significantly deformed earlier Alpine folds and thrusts, Tethyan fault blocks and Hercynian structures. 3D modelling of an initially horizontal surface, the interface between basement and Mesozoic cover, highlights large-scale basement involved asymmetric folding that is also detected using structural analysis. Both, Jurassic block faulting and basement fold-and-thrust shortening were strongly dependent on the orientation of Tethyan extension and Alpine shortening relative to the late Hercynian fabric. The latter’s reactivation in response to oblique Jurassic extension produced an en-échelon syn-rift fault pattern, best developed in the western, strongly foliated basement units. Its Alpine reactivation occurred with maximum efficiency during the early stages of lateral escape, with tectonic transport in the overlying units being sub-perpendicular to it. 相似文献
95.
Marc-André Gutscher Stephane Dominguez Graham K. Westbrook Pascal Gente Nathalie Babonneau Thierry Mulder Eliane Gonthier Rafael Bartolome Joaquim Luis Filipe Rosas Pedro Terrinha 《Marine and Petroleum Geology》2009,26(5):647-659
The Gulf of Cadiz lies astride the complex plate boundary between Africa and Eurasia west of the Betic-Rif mountain belt. We report on the results of recent bathymetric swathmapping and multi-channel seismic surveys carried out here. The seafloor is marked by contrasting morphological provinces, spanning the SW Iberian and NW Moroccan continental margins, abyssal plains and an elongate, arcuate, accretionary wedge. A wide variety of tectonic and gravitational processes appear to have shaped these structures. Active compressional deformation of the wedge is suggested by folding and thrusting of the frontal sedimentary layers as well as basal duplexing in deeper internal units. There is evidence for simultaneous gravitational spreading occurring upslope. The very shallow mean surface and basal slopes of the accretionary wedge (1° each) indicate a very weak decollement layer, geometrically similar to the Mediterranean Ridge accretionary complex. Locally steep slopes (up to 10°) indicate strongly focused, active deformation and potential gravitational instabilities. The unusual surface morphology of the upper accretionary wedge includes “raft-tectonics” type fissures and abundant sub-circular depressions. Dissolution and/or diapiric processes are proposed to be involved in the formation of these depressions. 相似文献
96.
Skillful low visibility forecasts are essential for air-traffic managers to effectively regulate traffic and to optimize air-traffic
control at international airports. For this purpose, the COBEL-ISBA local numerical forecast system has been implemented at
Paris CDG international airport. This local approach is robust owing to the assimilation of detailed local observations. However,
even with dedicated observations and initialization, uncertainties remain in both initial conditions and mesoscale forcings.
The goal of the research presented here is to address the sensitivity of COBEL-ISBA forecast to initial conditions and mesoscale
forcings during the winter season 2002–2003. The main sources of uncertainty of COBEL-ISBA input parameters have been estimated
and the evaluation of parameter uncertainty on the forecasts has been studied. A budget strategy is applied during the winter
season to quantify COBEL-ISBA sensitivity. This study is the first step toward building a local ensemble prediction system
based on COBEL-ISBA. The conclusions of this work point out the potential for COBEL-ISBA ensemble forecasting and quantify
sources of uncertainty that lead to dispersion. 相似文献
97.
Fabien Arnaud Joël Serralongue Thierry Winiarski Marc Desmet Martine Paterne 《Comptes Rendus Geoscience》2006,338(4):244-252
In Lake Anterne (NW French Alps), the Roman period is characterised by a lead contamination more important than that of the 1970s, due to the use of leaded gasoline. The maximum of this contamination period has been varve-dated 220 AD, i.e., during the optimum of Roman civilization in the Alps. Crossing palaeoenvironmental and archaeological evidences points out the economic importance of the town of Passy for the City of Vienne and yields a new example of lead contamination due to local metallurgical activity rather than distant impact of the exploitation of the Spanish Rio Tinto mine. To cite this article: F. Arnaud et al., C. R. Geoscience 338 (2005). 相似文献
98.
三峡库区三斗坪大坝区及其周围地区在1994到1998年期间,由于大坝的施工地面发生了巨大变化。这些变化在1990、1997和1998年获取的SPOT遥感图像上都有明显的记录,其中一些地面变化细节在分辨率10m的全波段(P)图像更为清楚。这里利用三种方法(高通滤波算法(HPF algorithm,Chavezet al.1991)、RWM—ARSIS方法(Ranchin and Wald,1999)和P+XS算法(Anonymous 1986))对三峡工程三斗坪大坝区的多时相高空间分辨率的SPOT图像(获取时闻为1990,1997和1998年,包括全波段P图像和多波段XS图像)进行融合处理,在提取测区地面动态变化信息的同时,从理论和实际应用的角度探讨了不同数据融合方法的效果。 相似文献
99.
Adam M. Booth John Dehls Trond Eiken Luzia Fischer Reginald L. Hermanns Thierry Oppikofer 《Landslides》2015,12(4):745-756
100.
Jauniaux T Farnir F Fontaine M Kiszka J Sarlet M Coignoul F 《Marine pollution bulletin》2011,62(6):1317-1319
The study describes cytochrome P450 1A1 (CYPA1) expression in the skin of different cetacean species (Megaptera novaeangliae, n = 15; Stenella attenuata, n = 7 and Stenella longirostris, n = 24) from the Mozambique Channel island of Mayotte. Immunohistochemical examination was performed with a monoclonal antibody against scup cytochrome CYPA1. The sex was determined using a molecular approach consisting in the genotyping sex-specific genes. CYPA1 was detected at the junction between epidermis and blubber on dolphins only, mostly in the endothelial cells. Similar observation was obtained in the dermis of one M. novaeangliae. Immunohistochemical slides were scored to evaluate the expression of the CYPA1 and a higher expression was observed in S. longirostris, suggesting a higher exposure to pollutants for this species. The difference of expression between sexes was not significant. 相似文献