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Belts of regenerated mountains including large arched uplifts, linear deformations and rift zones are widely distributed over Eurasia and North America. Mongolian-Siberian mountain belt is an example of such system. Mountain belts of the Mongolian
-Siberian type with complete set of zones are characterised with general arch-like uplifts of the socle due to isostatic upheavals above anomalous mantle lenses. Within isolated mountain belts individual forms replace each other across the belt
. In the mountain belts associated with epigeosynclinal constructions the forms replace each other along the system's axis. Uncomplete mountain belts include only large arches and linear deformation zones and have no general socle uplifts. - (Ed.).

borings and geophysics. The distribution of the Neogene volcanism as well as the thin crust and high heat flow found by these investigations revealed however the existence of an active young-alpine mantle arch. The area above the mantle arch subsides
isostatically due to the changes in density of the lithosphere and to the subsidence of the thinned crust, producing the Pannonian Basins. Finally basaltic partial melt products of the mantled arch heated gradually by the volatile emanations extrude, too

Arche naturelle ; Domaine aride ; Erosion différentielle ; Erosion éolienne ; Etats-Unis ; Fluviatile ; France ; Géographie physique ; Géomorphodynamique ; Géomorphologie climatique ; Lithologie ; Méandre
, leur importance variable en élévation et en ouverture, les types de formes d'arc, l'opposition entre l'isolement du pont naturel dans une vallée, et le groupement plus ou moins systématique des arches naturelles.

about landforms in relationship with the shape of diapir. Internal geometry of eruptive rocks carries away concrete structural landforms (ridge, anticline arch), has a great influence on joint-organization of rocks and can be a factor of weakness

l'arche de Sweetgrass. La découverte des foraminifères planctoniques, Rotalipora cushmani, d'âge Cénomanien tardif, en association avec trois autres espèces carénées, suggère l'existence d'un bras marin orienté est-ouest reliant le Pacifique oriental et

Les dépôts de sable et de gravier, d'âge Wisconsinien tardif, qui recouvrent l'arche de Frontenac en Ontario, dévoilent l'existence d'un important système de drainage sous-glaciaire et sub-aquatique des eaux de fonte des glaces durant une ou

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