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Portail d'information géographique

Résultats de la recherche (60 résultats)

A test of petrological control in the development of bornhardts and koppies on the Matopo's batholith, Zimbabwe

A test of petrological control in the development of bornhardts and koppies on the Matopo's batholith, Zimbabwe

Petrology of the western Reykjanes peninsula, Iceland

Petrology of the western Reykjanes peninsula, Iceland

Petrology of recent basalts of the eastern volcanic zone, Iceland

Petrology of recent basalts of the eastern volcanic zone, Iceland

Analysis of spatial relationships among geomorphic, petrographic and structural characteristics of the Dartmoor tors

Crystalline rocks ; Devon ; England ; Geomorphology ; Grain size distribution;Granulometry ; Granites ; Petrology ; United Kingdom

Krasoveni-soucast epigeneze karbonatovych hornin. (Karstification a part of carbonate rocks'epigenesis)

The A. summarizes new sedimentological, petrological and mineralogical evidences for dependence of structural and textural changes in carbonate rocks on various types of diagenetic environments. The results are compared with the conclusions

Retrograde dehydration of hornblende in quartzofeldspathic granulites in the Limpopo Northern Marginal Zone, Zimbabwe

, mineralogic, and petrologic data.

Spectral and petrologic analyses of basaltic sands in Ka'u Desert (Hawaii) – implications for the dark dunes on Mars

Spectral and petrologic analyses of basaltic sands in Ka'u Desert (Hawaii) – implications for the dark dunes on Mars
Aeolian features ; Basalt ; Comparative study ; Desert ; Dune ; Hawaii ; Mars planet ; Petrology ; Pyroclastic ; Spectroscopy ; Volcanic sand ; Volcanism

Eltérések és hasonlóságok a hegylábfelszínek pleisztocén felszínfejlödésében

The two research areas show differences in their Pleistocene surface evolution due to the petrological build-up of the background, the size of the watershed, the amount of precipitation, and the differences in tectonic activity. These factors

Lateritic crusts as climate-morphological indicators for the development of planation surfaces―Possibilities and limits

levels. It will be shown that the genesis of lateritic crusts seems to be more dependant on the petrological conditions than had before been assumed. Finally a comparison of the planation surfaces of Togo with the planation chronologies of West Africa

Contrôle structural du volcanisme de Nyos, NW-Cameroun

Cameroon ; Fault ; Geophysics ; LANDSAT ; Lava ; Lithosphere ; Maar ; Petrology ; Remote sensing ; Seismicity ; Structural geomorphology ; Volcanic eruption ; Volcanism

A catenary approach to the study of gravel layers and tropical landscape morphodynamics

Results of the study of the relationships between landsurface morphology and surficial geology in the forest-savanna zone of Sierra Leone. Examining the variations in gravel layer petrology within a catenary framework gave insights

The weathering of granodiorite porphyry in the Thiel Mountains, inland Antarctica

Antarctica ; Cold area ; Crystalline rocks ; Electron microscope ; Mountain ; Petrology ; Weathering

A review of lamellae

Clay ; Geochemistry ; Iron ; Palaeo-environment ; Pedogenesis ; Petrology ; Quaternary ; Sedimentary structure ; United States of America ; Wisconsin

The submerged beachrock on the northern shelf of South China Sea.

Preliminary results of petrological analysis. The geomorphologic position, sedimentary and diagenesis features of the sandstone are important for the demonstration of the existence of a 50 m paleocoastline off the northern shelf of the South China

Quaternary landscape evolution in the San Jacinto fault zone, Peninsular Ranges of Southern California : transient response to strike-slip fault initiation

This study integrates data from sedimentology, stratigraphy, and process geomorphology, with additional information from prior work on structure, petrology, and tectonics in the fault zone. The AA. propose a hypothesis for geomorphic evolution

Einige neue Erkenntnisse zum geologischen Bau und zur Lagerstättenbildung im Erzgebirge. (Some recent findings on geological structure and on formation of deposits in the Ore mountains)

On the basis of the petrologic characteristics and the lithostratigraphy of the Precambrian-Lower Palaeozoic metamorphites of the Ore Mountains the development of sedimentation areas and the chronological and regional course of tectonic, magmatic

Zum Problem der Granitgenese im Erzgebirge, DDR. (On the problem of genesis of granit in the Ore Mountains, GDR)

and petrologic findings. (HL).

Metamorphose und Magmatismus in Venn-Stavelot-Massiv, Ardenen. (Metamorphosis and magmatism in the Venn-Stavelot-Massif, Ardennes)

The Venn-Stavelot Massif is the eastermost of four upfolded massifs which make outcropping the pre-Variscan basement of northwestern Europe. The Venn-Stavelot Massif has a huge petrological, historical-geological and geodynamical importance, which

Quantitative geomorphic analysis of asbestos dispersion and pollution from natural sources: the case-history of the Pollino National Park, southern Italy

Applied geomorphology ; Asbestos ; Atmospheric dispersion ; Basilicata ; Calabria ; Fluvial erosion ; Italy ; Ore ; Petrology ; Pollution ; Remote sensing ; Thematic mapping
and geomorphological mapping, quantitative geomorphic analysis, petrological and mineralogical analyses of outcropping crystalline-metamorphic rocks, aerosol analyses, and remote sensing investigations. This study allowed to assess the degree of environmental hazard

Red Mediterranean soils in some karstic regions of Taurus mountains, Turkey

The objective of this work is to provide further explanation regarding the pedogenesis of Red Mediterranean soils in the karstic Mediterranean regions of Turkey. Sedimentary petrology and mineralogy of limestones are the factors that control