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Characterisation of deep intra-continental magma reservoirs – Insights from noble gases and p-T estimates into the western Eger Rift (Czech Republic)

Authors
/persons/resource/kyriaki

Daskalopoulou,  Kyriaki
2.1 Physics of Earthquakes and Volcanoes, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
CVO-Eifel, Deutsches GeoForschungsZentrum;

/persons/resource/nied

Niedermann,  Samuel
3.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
CVO-Eifel, Deutsches GeoForschungsZentrum;

/persons/resource/fwilke

Wilke,  Franziska
3.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
CVO-Eifel, Deutsches GeoForschungsZentrum;

/persons/resource/weihei

Zimmer,  Martin
3.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
CVO-Eifel, Deutsches GeoForschungsZentrum;

/persons/resource/radon

Woith,  H.
2.1 Physics of Earthquakes and Volcanoes, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
CVO-Eifel, Deutsches GeoForschungsZentrum;

/persons/resource/glodnyj

Glodny,  J.
3.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
CVO-Eifel, Deutsches GeoForschungsZentrum;

Geissler,  Wolfram H.
External Organizations;
CVO-Eifel, Deutsches GeoForschungsZentrum;

/persons/resource/kaempf

Kämpf,  H.
3.2 Organic Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
CVO-Eifel, Deutsches GeoForschungsZentrum;

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Citation

Daskalopoulou, K., Niedermann, S., Wilke, F., Zimmer, M., Woith, H., Glodny, J., Geissler, W. H., Kämpf, H. (2025 online): Characterisation of deep intra-continental magma reservoirs – Insights from noble gases and p-T estimates into the western Eger Rift (Czech Republic). - Chemical Geology, 122722.
https://doi.org/10.1016/j.chemgeo.2025.122722


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5034277
Abstract
The western Eger Rift (Czech Republic) is a currently inactive volcanic rift that is characterised by earthquake swarm activity and degassing of mantle-derived fluids. Free gases and (ultra-) mafic phenocrysts and xenoliths are used to determine the origin and evolution of volatiles in the system and to define the magma reservoir p-T conditions. Isotope compositions of helium in both fluids and minerals are up to 6.79 RA. 20Ne/22Ne ratios range up to ~11.0 and 21Ne/22Ne ratios up to ~0.048. Correction for isotopic mass fractionation of Ne suggests a source of mixed atmospheric and mantle type components with a significant crustal input. The slightly lower-than-mantle 3He/4He ratios and the Ne isotopic compositions indicate that these gases may have been impacted by a subduction-related crustal component during the Variscan (or Hercynian) Orogeny. 40Ar/36Ar ratios range up to 4680. Such higher-than-atmospheric values in most mineral and free gas samples indicate that Ar likely derives from the mixing of atmospheric and mantle sources as well. Thermobarometry of ortho- and clinopyroxene rim pairs of matrix grains yields predominantly p-T conditions of 1.1 ± 0.5 GPa and 700 ± 100 °C, respectively, indicating a lithospheric depth of 40–45 km for 1.5 GPa and 20–25 km for 0.5 GPa. Conversely, pairing cores of mm-sized pyroxenes points to p-T conditions of 2.5 ± 0.5 GPa and 1100 ± 100 °C, corresponding to a lithospheric depth of ~75 km. The diverse chemistry and the wide range of p-T conditions characterising the crystals indicate magma ascent.