Pflerschtal
The Pflerschtal (also simply Pflersch , Italian Val di Fleres ) is located in South Tyrol in Italy and branches off from the Wipptal to the west at Gossensaß . It extends around 16 kilometers into the Stubai Alps . The end of the valley is framed by the Schnee- and Agglsspitze as well as the Feuersteinferner . The peaks rise on the north side of the valley steep the main ridge of the Stubai Alps, particularly striking among these is the from dolomite built Pflerscher Tribulaun and Weißwandspitze . The valley is drained via the Pflerscher Bach .
The settlements in the valley belong to Pflersch , a fraction of the municipality of Brenner . The valley is only sparsely populated and comparatively little developed for tourism. Mining was carried out in the Pflerschtal in the 15th and 16th centuries, which is why the valley was also called Silbertal .
geology
The presence of various geological units in the smallest of spaces makes the Pflersch valley interesting from a natural science perspective. The valley lies west of the Brenner furrow not far east of the Tauern window . It opens up rocks from the alpine structural unit of the Oberostalpins .
The valley floor and large areas of the valley slopes consist of often intensely folded and polymetamorphic rocks of the Ötztal-Stubai Crystalline , i.e. gneiss , mica schist , quartzite and amphibolite , in which there are some granite or granodiorite deposits.
In some mountain ranges and peaks on both sides of the valley, but especially in those on its north side, the Ötztal-Stubai crystalline rocks from the so-called Brenner Mesozoic Era , which were deposited in the Triassic, are deposited. These predominantly flat sedimentary rocks are markedly less metamorphic than the underlying Ötztal-Stubai crystalline . In contrast to the rocks of the Kalkkögel , which are also included in the Brenner Mesozoic, the rocks in the vicinity of the Tribulaun group show a clear metamorphosis in places. In some places, for example at the Weißwandspitze or in the area around the Tribulaune, the overlaying of the gneiss and mica schist of the Ötztal-Stubai Crystalline by the rocks of the Brenner Mesozoic Era is clearly visible. This is followed by around 60 m thick quartzites, sandstones , limestones , marls and claystones, mighty dolomites, which because of their massiveness and hardness form the main peaks such as the Tribulaune and the Rotspitze. At its base, a band of conspicuous phyllitic clay stones is inserted into the dolomites, the Raibler layers . On the south side of the Tribulaun, the Raibl layers are exposed a little west of the normal route to the Pflerscher Tribulaun at an altitude of 2620 m. The four to five meter thick layers here are composed of sandy-clay phyllites in which blue-gray, sandy dolomite forms an elongated lens about 30 centimeters thick.
In the northeast of the valley in the area of the Rotjoch there are rocks from the Steinacher Nappe on the Brenner Mesozoic Era, mainly quartz phyllites, which are covered by conglomerates and sandstones with coal seams from the carbon .
The units described have not been preserved in their original position, but were sheared from their subsoil in the course of the Alpid mountain formation , pushed many kilometers in a northerly direction and stacked on top of each other. The Pflerscher Bach cuts through a pile of tectonic blankets . The lowest exposed ceiling comprises rocks of the Ötztal-Stubai crystalline . It is overlaid by the ceiling of the Brenner Mesozoic Era, on which the Steinach ceiling rests as the uppermost ceiling. In the deeper subsurface, rocks of the Penninic are suspected, which in the Tauern window descend to the west under the rocks of the Upper Eastern Alpine and come to the surface again further west in the Engadine window .
literature
- Egon Bernabè: Petrological and thermobarometric investigations on the Pflersch metabasite complex (Pflerschtal, South Tyrol - Italy). University of Innsbruck, 2009
Web links
Individual evidence
- ↑ Compass Lexicon for Map No. 44, Sterzing. 1997, ISBN 3-87051-050-1
- ↑ a b Horst Kübler, Wolf-Erhard Müller: The geology of the Brenner Mesozoic between the Stubai and Pflersch valley (Tyrol). Yearbook of the Federal Geological Institute, vol. 105, pp. 173–224, Vienna 1962, ( online ; PDF; 8.5 MB)
- ^ Klaus Schmidt: On the construction of the southern Ötztal and Stubai Alps. Journal of the German Geological Society, Vol. 116, pp. 455–469, Hanover 1965 ( online ; PDF; 887 kB)
- ↑ M. Köhler: Brenner flat railway. Project 1978. Results of the geological surveys . In: Geological and Palaeontological Communications Innsbruck . Innsbruck 1978, p. 1-99 ( uibk.ac.at [PDF]).
Coordinates: 46 ° 58 ' N , 11 ° 21' E