Field trip: High-and ultrahigh-pressure rocks of Pohorje – a window to deep subduction and lithosphere dynamics through geologic time
The field trip on 27 June 2018 is optional and not included in the registration fees.
Highlights
- Pohorje UHP metamorphic terrane represents the most deeply subducted part of the Austroalpine units of the Alps (Fig 1).
- Thermobarometric data on Pohorje rocks record peak-pressure conditions of up to 3.5–3.7 GPa at 800–850ºC in eclogites, 4.0 GPa at 900ºC in garnet peridotites and ≥3.5 GPa at 800–850ºC in diamond-bearing gneisses.
- During the field trip we will focus on the Slovenska Bistrica Ultramafic Complex (SBUC), a 8 x 1 km2 body of meta-ultramafic rocks, including serpentinized harzburgite, kyanite-garnet gneiss and garnet peridotites (Figs. 2 & 3).
- Additional information on the geological context can be found in Excursion_Pohorj.
Fig. 1
Fig. 2
Fig. 3
Field trip leaders
Mirijam Vrabec, Department of Geology University of Ljubljana, Slovenia
Marian Janák, Earth Science Institute, Slovak Academy of Sciences, Bratislava, Slovakia
Schedule and Logistics:
- Start of excursion: Seggau Castle after breakfast (08:30).
- Pohorje-Slovenska Bistrica will be reached via Maribor by mini-bus (ca. 1 hour).
- Visit of different outcrops, including UHPM rocks in Slovenska Bistrica Ultramafic Complex (SBUC).
- The excursion will be in a mountainous landscape of bedrock hills and forest with outcrops along a narrow road and valleys. Most outcrops are reached after a short, easy walk from the parking; some of them will require 30–60 min walk on easy but likely muddy path.