subject: The Region Of Aubrac :beauty And Science [print this page] The Aubrac is a high volcanic plateau and granite located in the center of the Massif Central. Located at the crossroads of three administrative regions: Midi-Pyrenees, Languedoc-Roussillon and Auvergne, it is the latter that is closest to both the geography, climate, traditions and the economy. He has a family resemblance to its cousin the Czallier. It is bordered to the north-west by the mountains of Cantal, on the east by the Margeride and south by the hills of the Causses.
The region of Aubrac and Aubrac mountains is an area which straddles the departments of Lozere, Cantal and Aveyron. It is bounded on the south by the Lot on the north by Truyre and is Colagne. The massive rises in the south to 1469 m Mailhebiau signal. It is a relatively old volcanic massif (6-9000000 years ) compared with volcanoes of the volcanos that they have only a few thousand years.
It takes the form of an elongated spine basalt (30 km long), management north-west/south-east, overlying a granitic basement (Margeride batholith), and arising from a fissure-type volcanism (rift ) or, as the authors of the most recent of several Hawaiian volcanoes type (volcano red) very close to each other . The basaltic lavas are issued or similar composition (basanite, basalt trachy, tephrite ...). You can also find local evidence of more violent eruptions, such as pyroclastic tuffs form or breccias , especially on the summits between Aubrac and Nasbinals.
Despite these eruptions, the Aubrac mountains are generally not very pronounced because the lava flows were fluid and it seems well built little individual volcanoes (or so they may have been eroded in phases hot late Tertiary). In fact, the few significant peaks were typically identified by the Quaternary glacial erosion.
A basalt ridge overlooking the north-east a high granite plateau (average elevation: 1200 m) which has the distinction of having been covered with a large ice sheet (500 km2 and 200 m thick) to the Quaternary (Pleistocene) and 3 times (glaciation Mindel, Riss and Wrm). The glaciers left visible marks almost everywhere (U-shaped valleys on the periphery - like that of Bes north or south Biouriare - moraines, boulders) and extensive deposits of alluvium (sandur, snow and avalanche deposits wind).
These deposits are sometimes exploited (Pits of Usangi). In areas of glacial deepening (umbilicus), they are often occupied by wetlands, including a large number of bogs, and sometimes lakes. They were also able to form moraine dams upstream.
In the south-west (side Aveyron), the landscape is characterized by steep slopes wooded (beech) which contrast with the vast pastures of the Aubrac Lozerian naked. The crest of the Aubrac dominates here in the Lot valley by a steep 1000 m altitude. It is the land of Boraldes, short rivers and fast flowing in very deep valleys and rushing in the Lot. These valleys have cut the base of the Aubrac, which has the distinction of being here metamorphic (schist, gneiss) while elsewhere granite.
The weather on the Aubrac plateau is rough and is often very snowy winter. The massif has several small ski resorts (Laguiole, Brameloup, Nasbinals, St. Urcize). It can snow in altitude from October to May and there may freeze the night almost every month of the year. The wind is no obstacle on the shelf and swept the snow, sometimes forming huge drifts that can stay late in the season (until May-June).
Abundant rainfall throughout the year and are around two meters on the slopes exposed. The prevailing wind is from the west but the south wind brings fog and sometimes bad weather on the Aubrac southern (especially during episodes Cevennes). Summers can be hot but they are often stormy, storms can be violent as in all mountain areas.
by: Anna Kerry
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