Cenozoic ; Fault ; Geomorphology ; New Zealand ; North Island ; Tectonics ; Vertical movement ; Volcanism
ranges were still submerged. Back-arc spreading extended from the Havre Trough to central North Island c.1.8 Ma. Eruption of ignimbrite began in central North Island c.1.1 Ma., and migrated to the Taupo Volcanic Zone c.0.6 Ma. Interrupted by a period
of inactive volcanism, the eruption revived in large magnitude c.0.33 Ma.
ou ferment des détroits. La Terre passe d'un régime d'englaciation unipolaire à un régime bipolaire à partir du Néogène, d'une circulation océanique zonale à la circulation thermohaline actuelle. A partir de 3 Ma, en relation avec la configuration des
Argentina ; Cenozoic ; Erosion cycle ; Erosion surface ; Fault ; Geomorphogenesis ; Mesozoic ; Model ; Palaeogeomorphology ; Palaeozoic ; Vertical movement
levelled the regional relief are identified by using geomorphological, geometrical structural and sedimentological criteria. Due to the Pampean faulting and uplifting during the last 10 Ma, almost all surfaces have been broken and tilted. The described
Here, based on geomorphological observations, the AA. calculate the amount of river incision and interfluve denudation in the Meuse basin upstream of Maastricht since 0·7 Ma and show that the main response to tectonic forcing was incision
California ; Climatic variation ; Fluvial erosion ; Geomorphology ; Isotope dating ; Landform evolution ; Mountain ; Palaeogeomorphology ; Sierra Nevada ; Tectonics ; Topography ; United States of America ; Vertical movement
surfaces to constrain erosion rates of adjacent granitic uplands. By combining these techniques, they derive high-resolution records of erosion, relief production, and paleotopography in the Sierra Nevada over the past 5 Ma. These new records help to link
Erosion ; Erosion surface ; Europe ; France ; Geochronology ; Geomorphogenesis ; Model ; Mountain ; Orogeny ; Pyrénées ; Spain ; Tectonics ; Vertical movement
d'évolution. L'étude a été menée dans le tronçon oriental des Pyrénées. L'A. y démontre une orogenèse saccadée, entrecoupée de phases d'arasement, ce qui rend quelque crédibilité au modèle davisien. Les vitesses d'arasement s'avèrent très rapides (6 à 8 Ma
This study takes advantage of the large number of outcrops exposing the inner structure of La Gomera (Canary Islands), due to its inactivity during the last 2.5 Ma, to develop a conceptual groundwater model. Based on a volcanostratigraphic model, 5
hydrostratigraphic units have been defined that include 2 main aquifers and volcaniclastic deposits located between them that control the vertical movement of the groundwater. The island has been classified into 4 aquifer systems or water management units based
Climatic zone ; Creep ; Mass movement ; Slope ; Slope dynamics ; Soil ; Soil properties ; Vegetation
The slow movement of the soil depends on local factors (slope angle, moisture of the soil, vegetation cover) and on the latitudinal and altitudinal climatic zonal factors (temperature, precipitation). The rate of soil movement in the polar
(periglacial) zone is the highest on the globe. It is, as mass movement of the soil, three times higher than in the alpine zone. The soil creep processes in temperate climates are relatively small but greater than in the tropic zone. The smallest soil movement
Space, mobility, and collective action : India's Naxalite movement
Andhra Pradesh ; Conflict ; Cultural studies ; Ideology ; India ; Land ; Organization ; Peasantry ; Place ; Rural society ; Social movement ; Tribe ; West Bengal
Using the notions of locale, location and sense of place, as an interpretative framework, the A. argues that a spatialized analysis of conflict provides important insights into social movement experience. We are informed about the spatial
and cultural specificity of movements and about the cultural expressions of social movement agency. These arguments are contextualized by analyzing the Maoist insurgency of the Naxalite movement, which first emerged in India during the late 1960s.
Mass movement in the Himalaya : new insights and research directions
Mass movement in the Himalaya
Asia ; Geographical information system ; Geomorphometry ; High mountain ; India ; Mass movement ; Mountain ; Mudflow ; Natural hazards ; Tectonics
The processes of mass movement in the Himalaya have been described many times for the past two centuries. Recently, developments in a variety of fields have been introduced to assess the character of mass movement. Geomorphometry, remote sensing
, digital elevation models, and geographic information system technology are revolutionizing the study of mass movement in the Himalaya.
Deformation-induced microstructures in soils affected by mass movements
France ; Landslide ; Mass movement ; Microstructure ; Slope ; Slope dynamics ; Soil ; Soil properties ; Solifluction
The soil deformation produced by mass movements gives rise to specific microscopic features. The study of some markers of deformation, such as the orientation of rigid clasts and the morphology of fine-grained intercalations, indicates that,in most
cases, mass movements can be related to simple shear. The development of these features varies according mainly to the type of mass movement (solifluction, debris flow or earth slide). A careful study of the microscopic features leads to a better