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Field Trip E12
Geological transect across central Eastern Alps:
Classic tectonic and paleogeographic localities
|Departure:||8 Sept. 2011; 7:30; from Munich, 9:15 from Salzburg|
|Return||15 Sept 2011, 19:30; Munich|
|Cost:||715 €; maximum: 24 participants.|
|Included:||Overnight lodging, breakfast, lunch, dinner|
|Not Included:||Drinks during dinner|
USA class 2.
DAV Rating: Bergwanderung leicht / Easy mountain hike.
|Southern wall of Dachstein (2998 m) with Middle and Upper Triassic carbonate platforms and reefs of a passive continental margin.|
The Eastern Alps represent a classical continent-continent collisional orogen with some specific peculiarities, which arise from the specific location on the interface between Alps, Carpathians, Pannonian basin and Dinarides. The understanding of the geology of Eastern Alps is, therefore, critical for the understanding of whole Alpine-Carpathian-Dinaric orogenic belt. Furthermore, the Eastern Alps also comprise many classic localities of structural geology, petrology and sedimentary geology, and a number of concepts were postulated on now famous localities. The excursion intends to visit all principal tectonic and paleogeographic zones along a ca. N-S transect across central and eastern sectors of the Eastern Alps (longitude of Salzburg and eastward from it). The principal goals of the excursion will be on following topics: (1) the nature of the East Alpine orogen with two Alpine orogenic belts stacked in one; (a) the Cretaceous-aged Austroalpine units representing the upper plate to (b) the classical Eocene-Miocene continent-continent collisional orogen; (2) evidence for two, Permian-Middle Triassic and Jurassic rifts, which finally evolved into two different oceans; particular evidence will given to the evidence of recently detected Permian and Middle Triassic events; (3) visit of the the type locality of eclogites (Saualpe), which indicate late Early Cretaceous A-subduction of the Austroalpine units; (4) assessment the evidence for Late Cretaceous post-orogenic collapse; (5) examination of Eocene-Neogene magmatism associated with slab break-off after cessation of subduction; (6) discussion of the evidence for Neogene lateral extrusion and associated exhumation of the Tauern window as a metamorphic core complex within compressional conditions; (7) study of the mode of formation of Neogene Styrian basin as extensional basin on top of the collapsing orogenic belt; and (8) proof of early Quaternary magmatism (alkaline basalts) as evidence for ongoing lithospheric thinning.
The eastern sectors of Eastern Alps are characterized by the contrast between high elevations (e.g. easternmost Hohe Tauern) going down — step by step — to the Neogene Styrian basin representing the westernmost part of Pannonian basin. The excursion route will cover many scenic spots in Nothern Calcareous Alps, eastern Tauern window, Nock Mountains and Carnic Alps as well as the hilly, low-lying part of the Styrian basin.
The excursion will mostly in Austria, which some exposures in southeastern Germany, northern Italy and possibly in Slovenia.