Acid igneous rocks of Stavelot Massif, a case of Pre-Hercynian weathering
Acid intrusive and extrusive rocks of the Stavelot Massif (Belgium) have been analyzed for major-and trace elements. The extrusive rocks have been subjected to pre-or syndiagenetic weathering, during which process biotite was a stable mineral
. The acid rocks are considered to be cogenetic on the basis of their Ti-Zr-Rb ratios.
Several sites with deep, weathered rock covered by till have been found in western Sweden. The material is unconsolidated, in some cases glacially tectonized. The weathered rock reveals neoformed minerals like smectite, kaolinite, and goethite
Skalni hriby v pislovcich Broumovské vrchoviny. (Mushroom rocks in sandstones of the Broumovska vrchovina (Highland))
Regional distribution and the morphogenesis of mushroom rocks in the Upper cretaceous block sandstones of the Broumovska vrchovina Highland (NE Bohemia). (MS).
Morphology, sedimentological characteristics and origin of a fossil rock glacier on Muckish Mountain, northwest Ireland
A large talus-foot debris accumulation on Muckish Mountain is interpreted as a fossil rock glacier rather than a glacial moraine as previously suggested. Sedimentological characteristics indicate that the debris accumulated initially as talus. Rock
glacier flow probably occurred due to the deformation of interstitial ice and ice lenses. The major stages in the development of the fossil rock glacier are outlined in a simple model.
Magyarorszag legosibb kristalyos kozetei és kapcsolatuk a kazpati-alpi hegységkerettel. (Most ancient crystalline rocks in Hungary and their relation to the Carpathian-Alpine mountain frame)
The most ancient rocks in Hungary are crystalline schists and igneous intrusives approximately five hundred million years old. Similar rocks can be detected along SW-NE axes partly on the surface and partly in the basement. Much of ancient rocks
Capture ; Devon ; England ; Erosion marine ; Géographie de l'Europe ; Géomorphogenèse ; Littoral ; Royaume-Uni ; Réseau de drainage ; Résistivité électrique ; Technique de recherche ; Valley of Rocks ; Vallée ; Vallée morte
Par la technique de la résistivité électrique on a pu mesurer l'épaisseur des dépôts meubles au-dessus de la roche en place et reconstituer le profil en long d'un ancien système de vallées. On en déduit que Valley of Rocks n'est pas une gouttière
Contributo alla conoscenza dei rock glaciers delle Alpi italiane. I rock glaciers del Monte Confinale (Alta Valtellina). (Contribution à la connaissance des Alpes italiennes. Les glaciers rocheux du Mont Confinale (Haute Valteline))
Slope rock glaciers consist of coarse debris and ice, the cryogenous structure being of basic type. The structure, spatial distribution, formation and evolution of the rock glaciers depend on climatic and geocryological conditions, rocks lithology
, slope angle and profile, as well as on the slope processes rate. The slope rock glaciers formation and evolution are conditioned by an action of a number of cryogenic processes and by plastic-viscous characteristics of the rock glaciers material. - (L'Ed.).
In river channels of NW Crimean Mountains the petrographic composition of alluvium is in close connection with the geology of the area. When a river crosses a zone of a certain solid rock the percentage of those rocks gravel noticeably increases
. Another controlling factor is the rock resistance - debris of less resistant rocks (marl, clay bolls) are weared out within a few kilometres and form suspended component of alluvium. Only gravels of most resistant rocks - Upper Jurassic limestones - caome
Les beach-rocks de la baie de Funtanamare (Sardaigne sud-occidentale) in Le beach-rock.
Ancien rivage ; Beach rock ; Funtanamare, baie ; Géographie de l'Europe ; Géomorphogenèse ; Géomorphologie littorale ; Italie ; Littoral ; Niveau marin ; PICG 200 ; Plate-forme continentale ; Pléistocène supérieur ; Quaternaire marin ; Sardegna
Dynamique littorale actuelle de la plage submergée| formes et dépôts attribués à la transgression versilienne. En particulier un beach-rock versilien, qui s'étire sur 3 km, ferme la baie à une profondeur qui va de 8 m sur les bords jusqu'à 20 m dans
la partie centrale. La comparaison avec les autres dépôts de plage submergés observés le long de la côte sarde, montre que le stationnement de la mer à la profondeur de ce beach-rock est un des plus importants de la transgression versilienne.
the subtransluscent to opaque matter in these composites, which principally represent actual rock fragments. This suggests that the sediments investigated contain products of rather freshly disintegrated rocks. The opaque components enable2 important groups of rocks
Estudio de un fenomeno de desprendimiento de rocas (rock-fall) en la Sierra de San Julian (Alicante) (Etude d'un phénomène d'éboulement (rock-fall) dans la Sierra de San Julian (Alicante))
In the Elbsandstein area most of the rock precepices take place between October and April as a result of breaking-off due to an increased water content of the sandstone. The range of influence important to evaluate rock precipices mainly depends
on the mode of movement and inclination of the impact area. The breaking-off risks are above all influenced by the width of the overhang and bank thickness, and can be read from a diagram. Other informations on rock movements to be expected are obtained
by evaluating regular measurements of exposed parts of rocks over a major period.
The gross morphology of the Precambrian basement of southern Sweden is analysed. The area has a donned form and emerges from under a cover of Palaeozoic rocks in the north and east and Mesozoic rocks in the south and west. A map of erosion surfaces
A morphogenetic characteristic of andesite rocks of the Vtacnik Mountain range in Central Slovakia. Rock outcrops are the relicts of Neogene lava flows and buttes a result of the frost weathering. - (MS)
After a general introduction into the development of the geo-sciences in Saxony, and into the history of conservation of geological objects, major relicts of the geological history (exposures, rocks, rock formations) are described. The text