Sample records for GEOLOGIE (geology)
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2

Contribution à l'étude de la sédimentation et de la géologie sous-marine dans le golfe de Gascogne Contribution to the study of marine sedimentation and marine geology in the Bay of Biscay

Berthois L.

Up until now, the Bay of Biscay has been the focus of only a very small number of studies. In its lithologic map of French seas, Delesse (1872) identified the sediments based only on the soundings of the French Naval Hydrographic Service. Thoulet's (1904) submarine lithologic map was made using the ...

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3

Trade-wind waves and mud dynamics on the French Guiana coast, South America: input from ERA-40 wave data and field investigations

Gratiot, Nicolas; Gardel, Antoine; Anthony, Edward

The South American coast between Brazil and Venezuela is affected by longshore migrating mud banks derived from the fine-grained Amazon sediment discharge. Onshore mud migration prevails over shallow ‘bank' areas alternating alongshore with deeper ‘inter-bank' areas. The transport on the inner shelf...

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5

The scheelite skan deposit of Salau (Ariege, French Pyrenees)

Fonteilles, M.; Soler, Pierre; Demange, M.; Derré, C.; Krier-Schellen, A.D.; Verkaeren, J.; Guy, B.; Zahm, A.

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6

The influence of bedrock topography on the dynamics of two clayey landslides in the Trièves (French Alps)

Kniess, Ulrich; Jongmans, Denis; Pathier, Erwan; Schwartz, Stéphane; Bièvre, Grégory; Villemin, Thierry

The two large adjacent landslides of Avignonet and Harmalière, affecting thick clayey quater- nary deposits, are located in the Trièves area (French Alps). Remote techniques (Lidar) and GPS measure- ments were used to characterize the two landslides. Results show major differences between the dynami...

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7

The importance of french transformist ideas for the second volume of lyell's principles of geology

Corsi, Pietro

Recently there has been considerable revaluation of the development of natural sciences in the early nineteenth century, dealing among other things with the works and ideas of Charles Lyell. The task of interpreting Lyell in balanced terms is extremely complex because his activities covered many fie...

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11

The Montagne Noire migmatitic dome emplacement (French Massif Central): new insights from petrofabric and AMS studies

Charles, N; Faure, M; Chen, Y

In the southern French Massif Central, the Montagne Noire axial zone is a NE-SW elongated granite-migmatite dome emplaced within Visean south-verging recumbent folds and intruded by syn- to late-migmatization granitoids. The tectonic setting of this dome is still disputed, thus several models have b...

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12

The Montagne Noire migmatitic dome emplacement (French Massif Central): New insights from petrofabric and AMS studies

Charles, Nicolas; Faure, Michel; Chen, Yan

In the southern French Massif Central, the Montagne Noire axial zone is a NE-SW elongated granite-migmatite dome emplaced within Visean south-verging recumbent folds and intruded by syn- to late-migmatization granitoids. The tectonic setting of this dome is still disputed, thus several models have b...

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13

The Gulf of Lions: An overview of recent studies within the French 'Margins' Programme

Berne Serge; Gorini C

Within the French 'Margins' Programme (Groupement de Recherches 'Marges', or 'GDR Marges'), The Gulf of Lions was selected as a key area where scientists specialized in complementary aspects of geosciences (structural geology, tectonics, stratigraphy, sedimentology, various aspects of modeling) work...

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14

The Bouillante 3D Structural Model (French West Indies): a Tool for Geothermal Exploration Combining Onshore and Offshore Geological Knowledge

Calcagno, Philippe; Bouchot, Vincent; Thinon, Isabelle; Bernard, Bourgine

The Bouillante area is located on the West side of the Guadeloupe Island (French West Indies); a region well known for geothermal resources. This sector is a key geodynamic area (e.g. Bouysse et al. 1988; Feuillet et al., 2002) at the junction of two regional fault systems: i) a major submarine N160...

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16

Tectonic shortening and gravitational spreading in the Gulf of Cadiz accretionary wedge: Observations from multi-beam bathymetry and seismic profiling

Gutscher, Marc-André; Dominguez, Stephane; Westbrook, Graham K.; Gente, Pascal; Babonneau, Nathalie

13 pages, 13 figures.-- Available online Jul 31, 2008.-- Issue title: "Thematic Set on New Insights on Slope Instabilities from Recent Studies within the French Margin Program GDR Marges". | Full-text version available Open Access at: http://www.igm.ineti.pt/MULTIMEDIA/ASSOCIA/BASE%20MONO/33208.PDF ...

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17

Structure of late Variscan Millevaches leucogranite massif in the French Massif Central: AMS and gravity modelling results.

Gébelin, Aude; Martelet, Guillaume; Chen, Yan; Brunel, Maurice; Faure, Michel

In the Limousin area, Variscan leucogranitic plutons are spatially associated with normal faults and major strike-slip shear zones that are a continuation of the South Armorican shear zone. Our study focuses on the large N–S-trending Millevaches granitic massif (Massif Central, France), and intends ...

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18

Slope instabilities from echo-character mapping along the French Guiana transform margin and Demerara abyssal plain

Loncke L.; Droz Laurence; Gaullier V.; Basile C.; Patriat Martin; Roest Walter R.

The French Guiana transform margin and Demerara abyssal plain have been recently surveyed in the framework of the EXTRAPLAC French Program of extension of the continental shelf (Guyaplac survey, Ifremer-IFP-SHOM-IPEV). Based on the interpretation of some of the data collected during the Guyaplac sur...

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19

Pull-apart emplacement of the Margeride granitic complex (French Massif Central). Implications for the late evolution of the Variscan orogen.

Talbot, Jean-Yves; Faure, Michel; Chen, Yan; Martelet, Guillaume

A microstructural, magnetic fabric and gravity study is performed on the Carboniferous Margeride granitic complex that crops out in the central part of the Variscan French Massif Central. This complex consists of three facies, namely, a main porphyritic monzogranite, a two-mica granite, and late leu...

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20

Pore-water chemistry in mangrove sediments: relationship with species composition and developmental stages. (French Guiana).

Marchand, Cyril; Baltzer, F.; Lallier-Vergès, Elisabeth; Albéric, Patrick

Spatial and seasonal variability of sedimentary salinity, pH, redox potential and solid phase sulphide concentration were investigated in a range of mangrove communities along the coast of French Guiana. Seasonal depth distributions of these parameters and organic content were compared within Avicen...

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21

Origin and diagenesis of lignin and carbohydrates in mangrove sediments of Guadeloupe (French West Indies): Evidence for a two-step evolution of organic deposits

Lallier-Vergès, Elisabeth; Marchand, Cyril; Disnar, Jean-Robert; Lottier, Nathalie

The mangroves of Grande Terre Island (Guadeloupe, French West Indies) are known to store large amounts of organic carbon, and organic-rich sediments have been described to several meters depth. The purpose of the present work was to precisely determine the molecular composition (carbohydrates and li...

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22

Major natural hazards in a tropical volcanic island: A review for Mayotte Island, Comoros archipelago, Indian Ocean

Audru, Jean-Christophe; Bitri, Adnand; Desprats, Jean-François; Dominique, Pascal; Eucher, Guillaume; Hachim, Said

Mayotte is a French Overseas Territory of the Comoros archipelago. Since the 1980, Mayotte has developed quickly: its population has multiplied by four in less than 30 years, infrastructure expanded rapidly in lowlands and slums developed in steep areas (through deforestation) or close to riverbeds....

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23

Internal architecture and mobility of tidal sand ridges in the East China Sea

Liu Zhenxia; Berne Serge; Saito Yoshiki; Yu Hua; Trentesaux Alain; Uehara Katsuto; Yin Ping; Liu J. Paul; Li Chaoxing

On the basis of bathymetric and seismic data and data from piston cores collected by the Chinese-French marine geology and geophysics investigation of 1996, we discuss the internal architecture and mobility of tidal sand ridges in the East China Sea (ECS). We characterized the sand ridges on the mid...

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25

Gravity inversion, AMS and geochronological investigations of syntectonic granitic plutons in the southern part of the Variscan French Massif Central

Joly, A; Faure, M; Martelet, G; Chen, Y

Magnetic fabric analyses, gravity inversion associated with chemical U-Th-Pb dating and structural observations are carried out to elucidate relationships between faulting and magmatic processes. This multidisciplinary study has been undertaken on Late Carboniferous plutons, situated in the southern...

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26

Gravity inversion, AMS and geochronological investigations of syntectonic granitic plutons in the southern part of the Variscan French Massif Central

Joly, Aurore; Faure, Michel; Martelet, Guillaume; Chen, Yan

Magnetic fabric analyses, gravity inversion associated with chemical U-Th-Pb dating and structural observations are carried out to elucidate relationships between faulting and magmatic processes. This multidisciplinary study has been undertaken on Late Carboniferous plutons, situated in the southern...

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27

Granitoid emplacement during a thrusting event: structural analysis, microstructuel and quartz-c-axis patterns. An example from hercynian plutons in the French Massif Central.

Duguet, Manuel; Faure, Michel

n the French Massif Central, the Rouergue–Albigeois area consists of three tectonic units stacked during the Hercynian orogeny. The structural analysis of the units and particularly the quartz left angle bracketcright-pointing angle bracket axis, textural and structural observations in the syntecton...

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28

Geophysical investigation of a large landslide in glaciolacustrine clays in the Trièves area (French Alps)

Jongmans, Denis; Bièvre, Grégory; Renalier, Florence; Schwartz, Stéphane; Beaurez, Nicolas; Orengo, Yves

Slope movements in clay deposits are spread all over the world and result from complex deformation processes, including internal strains in the landslide body and slipping along rupture surfaces. Such mass movements are likely to generate changes in the geophysical parameters characterizing the grou...

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29

Failure mechanisms and triggering factors in calcareous cliffs of the Subalpine ranges (French Alps)

Frayssines, Magali; Hantz, Didier

In order to enhance the detection of prospective rock falls in calcareous cliffs, 25 rock falls have been described in a more detailed way than for an inventory. They are representative of middle size rock falls (10 to 100,000 m3) occurring in the French Subalpine Ranges, at an elevation between 200...

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31

Erroneous coal maturity assessment caused by low temperature oxidation.

Copard, Yoann; Disnar, Jean-Robert; Becq-Giraudon, Jean-François; Laggoun-Défarge, Fatima

Previous work carried out on different outcrop coals from the French Massif Central revealed abnormally high Tmax values, which initially were attributed to high temperature oxidising fluids. This increase in Tmax, which was exclusively observed for medium to low volatile bituminous coals (Rr≥1.5%),...

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32

Environmental significance of microbialites in reef environments during the last deglaciation

Camoin G; Cabioch G; Eisenhauer A; Braga J; Hamelin B; Lericolais Gilles

In situ microbialites occurring in reef rocks dredged between 80 and 130 in water depth on the modern fore-reef slopes of Tahiti and the Marquesas islands yield ages ranging from 17,100 2900 to 4410 2250 years BP, suggesting that they played a prominent role during the last deglacial sea level rise....

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33

Emplacement in an extensional setting of the Mont Lozère-Borne granitic complex (SE France) inferred from comprehensive AMS, structural and gravity studies.

Talbot, Jean-Yves; Martelet, Guillaume; Courrioux, Gabriel; Chen, Yan; Faure, Michel

The emplacement mode and setting of the Late Hercynian Mont Lozère–Borne granitic complex (French Massif Central), which consists of several plutons, is investigated. Structural and anisotropy of magnetic susceptibility (AMS) studies have been carried out to characterize the internal fabrics of the ...

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34

ESTIMATING AGGLOMERATION ECONOMIES WITH HISTORY, GEOLOGY, AND WORKER EFFECTS

Combes, Pierre-Philippe; Duranton, Gilles; Gobillon, Laurent; Roux, Sébastien

Does productivity increase with density? We revisit the issue usingFrench wage and TFP data. To deal with the ‘endogenous quantity of labour' bias (i.e., urban agglomeration is consequence of high local productivity rather than a cause), we take an instrumental variable approach and introduce ...

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35

Coastal dynamics and chenier sands in French Guiana

Prost, Marie-Thérèse

Etude sédimentologique de la zone côtière de la Guyane Française entre les fleuves Mahuri et Maroni.

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36

Automicrites in modern cyanobacterial stromatolitic deposits of Rangiroa, Tuamotu Archipelago, French Polynesia: Biochemical parameters underlaying their formation

Gautret, Pascale; Trichet, Jean

This paper provides evidence of the role of the proteinaceous constituents of the sedimentary organic matter in the control of (Ca, Mg) carbonate precipitation within recent stromatolitic sediments belonging to the kopara-type (Rangiroa, Tuamotu Archipelago, French Polynesia). Millimeter- to cm-thic...

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37

Assessment of the Bouillante Geothermal Field (Guadeloupe, French West Indies): Toward a Conceptual Model of the High Temperature Geothermal System

Bouchot, Vincent; Traineau, Hervé; Guillou-Frottier, Laurent; Thinon, Isabelle; Baltassat, Jean-Michel; Fabriol, Hubert

The Bouillante geothermal field is located on the west coast of the French West Indies island of Guadeloupe (France, Lesser Antilles). The large range of scientific (geology, geochemistry, geophysics, hydrogeology) results obtained over the last 10 years on this field have made it possible to develo...

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38

Application of geophysical measurements for assessing the role of fissures in water infiltration within a clay landslide (Trièves area, French Alps)

Bièvre, Grégory; Jongmans, Denis; Winiarski, Thierry; Zumbo, Vilma

Rainfall and its consequences are usually considered as the major factor trig- gering slope instabilities within clay deposits. The link between rainfall, water inltration and landslide activity may be complex and comprehensive sets of data are still necessary to understand how water inltrates in co...

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39

A review of the pre-Permian geology of the Variscan French Massif Central

Faure, Michel; Lardeaux, Jean-Marc; Ledru, P.

The Massif Central, like the southern part of the Massif Armoricain, belongs to the North Gondwana margin. The Massif Central consists of a stack of nappes resulting of six main tectonic-metamorphic events. The first one, D0, is coeval with an Early Late Silurian (ca 415 Ma) high-pressure (or ultra ...

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40

A low δ7Li lower crustal component: Evidence from an alkalic intraplate volcanic series (Chaîne des Puys, French Massif Central)

Hamelin, Cédric; Seitz, Hans-Michael; Barrat, Jean-Alix; Dosso, Laure; Maury, René C.; Chaussidon, Marc

The intraplate volcanic suite of the Chaîne des Puys (French Massif Central) shows a complete petrologic range, from alkali basalts to trachytes. The significant variations of trace elements and radiogenic isotopes along the series strongly support the occurrence of crustal assimilation associated w...

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41

A low delta7 Li lower crustal component: Evidence from an alkalic intraplate volcanic series (Chaine des Puys, French Massif Central)

Hamelin Cedric; Seitz Hans-michael; Barrat Jean-alix; Dosso Laure; Maury Rene; Chaussidon Marc

The intraplate volcanic suite of the Chaine des Puys (French Massif Central) shows a complete petrologic range, from alkali basalts to trachytes. The significant variations of trace elements and radiogenic isotopes along the series strongly support the occurrence of crustal assimilation associated w...

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42

Jacome, A.

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43

Giuliani, G.; Fallick, A.E.; Ohnenstetter, D.; Pegere, G

Alluvial and colluvial gem sapphires are common in the basaltic fields of the French Massif Central (FMC) but sapphire-bearing xenoliths are very rare, found only in the Menet trachytic cone in Cantal. The O-isotope composition of the sapphires ranges between 4.4 and 13.9‰. Two distinct groups have ...

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44

Gilmour, I.; French, B.M.; Franchi, I.A.; Abbott, J.I.; Hough, R.M.; Newton, J.; Koeberl, C.

The Gardnos impact structure in southern Norway is one of only two known impact structures (among similar to175) whose impactites contain significant amounts (typically 0.2-1.0 wt.%) of carbon, or 5 to 10 times the amount present in the target rocks; Sudbury, Canada is the other. This study extends ...

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