Field Trips


 

Number

Field trips

1

Epithermal mineralization of Tokaj and Matra Mountains

2

Bakony-Balaton Highland Volcanic Field

 


Epithermal mineralization of Tokaj and Matra Mountains 9-11 June, 2003

 

Leader: Feri Molnar

 

Programme of the field trip:


1st day

8:30 am Departure (arrival to the first field stop at around 12.00 pm)

In the morning:

§       Stop 1 Mad, Kerektolgyes:

Lacustrine siliceous deposits with bentonite.

§       Stop 2 Yellow Wine-House at Disznoko:

Lunch-break from 1.00 to 2.30 pm.

In the afternoon:

§       Stop 3 Kiraly-hill:

Steam-heated alteration zone near Mad (2.45-3.45 pm).

§       Stop 4 Bomboly-hill:

Boiling horizon of a LS type epithermal system with quartz veins superimposed by steam-heated alteration at the Bomboly-hill, near Mad 3.00-4.00 pm.

Travel to the accommodation at the Hotel Bodrog, Sarospatak 4.00-5.30 pm. Sight-seeing tour in the old Rakoczi castle followed by a Renessaince-style dinner 5.30-11.00 pm.


2nd day

Leave Hotel Bodrog at 9.00 am.

In the morning:

§       Stop 1 Sarospatak:

Siliceous zone with cinnabar showings of a steam-heated alteration level at Botko quarry at Sarospatak 9.15-10.00 am then travel to Palhaza.

§       Stop 2 Palhaza:

Palhaza perlite quarry 10.30-11.30 am then travel to Telkibanya.

§       Stop 3 Telkibanya:

Lunch-break at Telkibanya from 12.00 pm to 1.00 pm.

In the afternoon:

§       Stop 4 Telkibanya:

The Telkibanya epithermal Au-Ag deposit, short walk on a medieval open-pit field with observations on alteration and recent tectonism 1.30-2.30 pm then travel to Regec.

§       Stop 5 Regec:

Hydrothermal eruption center with banded siliceous deposit containing cinnabar mineralization in the Regec caldera 3.15-4.00 pm then travel to Tallya.

§       Stop 6 Tallya:

From 5.00 to 10.00 pm wine-tasting party with cold dinner (Hungarian sausages, bacons etc.) in a private cellar at Tallya. Return to the accommodation in a good shape...


3rd day

Leave Hotel Bodrog at 9.00 am (arrival to Recsk at 12.00 am).

 

In the morning:

§       Stop 1 Lahoca:

Drillcore logging from 12.00 pm to 1.00 pm. HS type epithermal mineralization of Lahoca and deep Cu-porphyry mineralization.

§       Stop 2:

Lunch-break from 1.00 to 2.30 pm.

In the afternoon:

§       Stop 3:

Superimposed breccia-dike on a HS alteration zone with LS type alteration 2.30 to 3.15 pm. Then travel to W-Matra.

§       Stop 4 Gyongyosoroszi:

Vein-outcrop of the Gyongyosoroszi LS type epithermal deposit 3.45-4.30 pm.
Then travel to Budapest, arrival at around 6.30 pm.

 

Total cost: 370 EUR

Cost will include transportation, double occupancy lodging, breakfast at the hotel, lunch from box and dinner.


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Bakony-Balaton Highland Volcanic Field (land of basalt flows and pyroclasts) 9 June, 2003

Leaders: Klara Kothay, Eniko Bali, Kalman Torok and Julia Degi

In the Carpathian-Pannonian Region (CPR) extension and post-extension related alkali basalt volcanism followed the Miocene-Pliocene subduction-related calc-alkaline magmatism. The major controlling factors on the alkali basalt volcanism are the followings: thinning of the lithosphere and updoming of the hot asthenosphere beneath the CPR. Radiogenic isotopic ratios and trace element compositions suggest that the upwelling asthenospheric material must have been derived from the Common European Asthenospheric Reservoir. Adiabatic decompression in the rising asthenosphere could have caused partial melting and, in some cases, the accumulated liquids were modified by a lithospheric mantle component, which had been metasomatized previously by subduction-related volatile(s).

Among the Late Miocene-Pleistocene alkali basalt volcanic fields within the CPR, the Bakony-Balaton Highland Volcanic Field is the largest and best-studied area. The volcanic activity which lasted from 7.5 to 2.8 Ma produced lava flows and pyroclasts. The explosive volcanic activities were mostly hydrovolcanic eruptions and subordinately magmatic explosive eruptions. Various magma/water ratios provided different type of eruptions (e.g. maar volcanoes, Strombolian-type eruptions).

The alkali basalt is moderately porphyritic textured and contains mostly olivine (rarely clinopyroxene) phenocrysts in holocrystalline or rarely glassy groundmass which consists of plagioclase, clinopyroxene, olivine, Fe-Ti oxides, nepheline and leucite. Olivine phenocrysts contain primary multiphase partially crystallized silicate melt inclusions and CO2 inclusions, which are extensively studied (particularly at Hegyestu) providing significant information about the primary mafic magma and the source region.

The alkali basalt and their pyroclasts contain large amount of upper mantle peridotite and pyroxenite, and lower crustal granulite xenoliths at several localities (e.g. Szentbekkalla and Szigliget). These xenoliths provide significant knowledge to better understanding of the evolution and history of the CPR. CO2 inclusions, sulfide blebs and silicate melt pockets are extensively studied in the peridotite and pyroxenite upper mantle xenoliths.

A portion of the Bakony-Balaton Highland Volcanic Field is a National Park preserving some natural exhibition areas (e.g. Hegyestu) and impressive lookout to the landscape, including the Lake of Balaton, from the top of the volcanoes. This is one of the oldest and most famous wine provinces in Hungary. A pleasurable wine tasting will close the field trip.

 

Programme of the field trip:

8.00 am Departure.

In the morning:

 

Stop1 Tihany:

 

A two-hours easy walk to the Baratlakasok outcrop, which shows an unusual type of maar volcanic complex (an association of large amount of accessory lithic fragments in hydroclastic beds).

 

Stop 2 Szentbekkalla:

 

A short and easy walk to the open-air theatre outcrop, which shows a unique occurrence of xenoliths of the whole lithosphere, from the mantle to the upper crust, in a hydroclastic flow and base surge deposit.

 

Stop 3 Hegyestu (“Sharp needle”):

 

Remnant of a lava neck (volcanic channel) showing beautiful example of columnar jointed basaltic rocks and hyaloclastic peperite (a special rock type of the mixture of magma and wet sediments).

After a short steep walk up to the top of “Sharp needle” we will have the lunch with a wonderful view to the Bakony-Balaton Highland Volvanic Field and the Lake of Balaton.

 

In the afternoon:

 

Stop 4 Szigliget:

 

A short walk to an extraordinary occurrence of lithosphere xenoliths in the pyroclastics of the Szigliget maar.

Visit of the Middle Age Castle

 

Stop 5 Badacsonytomaj:

 

Wine tasting and dinner at the foot of the Badacsony volcano.

Then travel to Budapest, arrival at around 10 pm.

 

Total cost: 50 EUR

Cost will include transportation, fieldtrip guide, and lunch from box and dinner with wine taste.

 




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