The Pan-African (800-500 Ma) Older Granite suite of Nigeria is dominated by calc-alkaline, I-type magmatism and is a product of subduction processes at the eastern margin of the West African craton. The Kanoma and Sabon Gida composite plutons of NW
Sur le caractère syntectonique de quelques plutons de la Sierra Morena occidentale (Sud-Ouest espagnol)
Batholite ; Espagne ; Espagne, Sud-Ouest ; Géographie de l'Europe ; Géomorphogenèse ; Pluton ; Sierra Morena ; Syntectonique
Divers arguments d'ordre structurel sont avancés pour établir une conception syntectonique de l'origine de quelques plutons de la Sierra Morena. (AGB).
In this work a new form surface map at 1:5000 scale of the north-eastern margin of the Oligocene Traversella pluton, synthesised from a field structural study assisted by optical petrography, is presented. Relative chronology of superposed
-eastern margin of the pluton by separating the pre- and the post-intrusive tectonic history and defining the contact aureole outline. Contact metamorphic assemblages and thermobarometric estimates indicate that this intrusive body emplaced at shallow
Evidence of sedimentary supply from plutonic sources in the Oligocene-Miocene flyschs of the Rifian Chain (Morocco) : provenance and palaeogeographic implications
plutonic and high rank metamorphic sources. This provenance is supported by the occurence of well rounded plutonic and high rank metamorphic pebbles within some conglomerate lithofacies of the Beni Ider Flysch, never found so far. Petrography
of these crystalline pebbles is very similar to that of the syn-late-Hercynian plutonic bodies and of the gneissic rocks widesspread in the Calabria-Peloritani Arc and, probably, the Kabylides. The AA. believes that this crystalline detritus could represent the product
Géomorphologie et diapirisme granitique: l'exemple des plutons de la moitié orientale des Pyrénées
A good knowledge of the altitude and shape of the intrusion-roofs is the better way to evaluate the work of selective erosion and to understand the topographic position of plutonic rocks. Selective erosion can discover intrusion walls and, so, bring
Analyse sommaire des images Landsat (1973) de la Bretagne à l'appui de trois cartes: fracturation du sol, linéaments et plutons, rejeux tectoniques post-hercyniens. Des structures circulaires ont été repérées. Elles semblent correspondre à l'aire
d'influence sur le relief des plutons granitiques qui dépasse l'affleurement des roches éruptives.
Basic regional crustal setting and superimposed local pluton-intrusion-related tectonic in the Larderello-M. amiata geothermal province, from integrated CROP seismic data
vers le sud du socle continental sur le pourtour du golfe de Gascogne en respectant les structures linéaires des plutons granitiques a entraîné un jeu de blocs où les plutons sont mis en valeur par leurs bordures parallèles.
Les Mourne Mountains offrent un bon exemple d'érosion différentielle à partir d'une surface ayant nivelé deux plutons tertiaires. Bien que le granite de ces deux plutons soit très comparable, il n'a pas résisté identiquement à la météorisation. Les
A propos du Massif de Millas, vaste pluton au-dessus du fossé de Conflent, aux portes du Roussillon dans les Pyrénées Orientales, l'A. cherche comment faire la part de l'érosion différentielle et de la tectonique dans l'étagement des formes d'un
Les alvéoles du massif cristallin de St Sylvestre. L'apport de la télédétection. (The basins of the plutonic Mount of St Sylvestre. A remote sensing approach)
Oxygen and strontium isotope data for 25late Caledonian granite plutons emplaced between 435and 390Myr indicate that the parent magmas were hybrids, derived from partial fusion of mantle-like material and varying proportions of a crustal component.
approach to the subject. The origins of all the main magma types are discussed, with particular reference to their occurrence in present-day volcanic regions. Equal attention is given to plutonic rocks, including those such as peridotite and anorthosite
The AA. report new field observations on stratigraphy, sedimentology, and geochemical data of plutonic rocks of the Shyok suture zone separaring the Ladakh terane to the SW from the Karakoram terrane to the NE. Six tectonic units have been
, sandstone, dacite, rhyolite, and basalt, as well as other plutonic rocks. Notches, cliff-foot caves, and swamp slots are congeners of flared slopes. Though a few bedrock flares are conceivably caused by nivation or by a combination of coastal processes, most
Deeply weathered plutonic rocks occur widely in the Sila Massif, Calabria, southern Italy. The AA. have chosen three representative weathering profiles developed on the hilltops as a natural laboratory to study the generation of sand-sized particles