HU5 - From maars to lava lakes: Ultramafic and granulite xenoliths associated with the alkaline basaltic volcanism of the Pannonian Basin

Leaders: Csaba Szabó (Eötvös L. University, Budapest,, István Kovács (Eötvös L. Geophysical Institute, Budapest)

Practical information:

  • Duration: 2 days
  • Post-conference: 28.08.2010 Budapest (HU) - 29.08.2010, Budapest (HU)
  • Length: 450 km
  • Min. number of participants: 5
  • Max. number of participants: 25
  • Field trip registration fee
    • Student/young scientist: EUR 20
    • Normal: EUR 40
  • Accommodation and meals cost: EUR 60
  • Demands: No special physical or other demands, Normal field trip equipment is recommended.
  • Means of transport: bus / van
  • Accommodation: Double room
    (for single possibilities contact Robert Hohol)
Full technical details in PDF format
Detailed itinerary in PDF format
Photo: Columnar basalt, Hegyes-tű protected geological site (HU)
Columnar basalt, Hegyes-tű protected geological site (HU)

Scientific focus (keywords): igneous petrology; alkaline basalt; maar; lava lakes; mantle xenoliths; crustal xenoliths; Balaton Highland; viticulture / viniculture

Xenolith-bearing Plio-Pleistocene alkali basalts occur at the edge of the Carpathian-Pannonian region (Styrian Basin, Nógrád-Gömör and Eastern Transylvanian Basin) and in its central part (Little Hungarian Plain and Bakony-Balaton Highland). Because the eruption of the host alkali basalts postdates the major tectonic events in the Carpathian-Pannonian region, their xenoliths record the effects of the preceding events, which include deformation, metasomatism and melt extraction and can be used as probes into the evolution of lithospheric block in extensional settings.

At the field trip we will visit the Bakony-Balaton Highland Volcanic Field that gives an insight into the composition of the thinnest part of the lithosphere beneath the Carpathian-Pannonian region. The upper mantle xenoliths here are mostly spinel peridotites, accompanied by subordinate pyroxenites and lower crustal granulites. The peridotites represent residual mantle material showing textural and geochemical evidence for a complex history of melting and recrystallization, irrespective of location within the region, whereas the pyroxenites indicate various melt-mantle interactions. The lower crustal xenoliths are dominantly mafic and rarely felsic granulites characterizing the lower crust prior to the extension of the Pannonian Basin. Petrographic and geochemical studies on the upper mantle and lower crustal xenoliths shed light on the evolution of the deep lithosphere beneath the Carpathian-Pannonian region

The scientific part of the route comprises several spectacular alkali basaltic occurrences and the most important xenolith-bearing localities with scenic views on the whole volcanic field, as well as on the Lake Balaton. The cultural sites include visits to the abbey of Tihany and to the medieval castle of Szigliget and the field trip ends in a wine tasting.

Photo: View of the Balaton Highland and the Lake Balaton (HU)
View of the Balaton Highland and the Lake Balaton (HU)

Daily programme:

Day 1 (28 Aug): Budapest - Tihany (Field stop 1): "Szélfutta" cliffs, general geology and volcanology of Bakony-Balaton Highland, pyroclastic deposits, ultramafic xenoliths; Benedictine Abbey of Tihany - Monoszló (Field stop 2): Hegyes-tű protected geological site: columnar basalt - Mindszentkálla-Szentbékkálla (Field stop 3): pyroclastic deposit, granulite and ultramafic xenoliths - Badacsonytomaj: accommodation, dinner with wine-tasting

Day 2 (29 Aug): Badacsonytomaj - Szigliget (Field stop 4): "Károly" quarry, pyroclastic deposit, granulite and ultramafic xenoliths; Szigliget Castle - Bazsi (Field stop 5): Prága Hill quarry, alkaline basalt, minerals - Haláp (Field stop 6): Haláp quarry, alkaline basalt, minerals - Budapest

On-line registration >>

Map of the field trip with the key locations (or download Kml file for Google Earth):

View HU5: Ultramafic and granulite xenoliths associated with alkaline basaltic volcanism of the Pannonian Basin: from maars to lava lakes in a larger map