2026-05-15T19:12:46Zhttp://doidb.wdc-terra.org/oaip/oai

oai:doidb.wdc-terra.org:81102025-03-20T07:44:27ZDOIDBDOIDB.FID

false4DOIDB.FID 10.5880/fidgeo.2025.003 Daskalopoulou, Kyriaki Kyriaki Daskalopoulou 0000-0002-5637-2984 Institute of Geosciences, University of Potsdam, Potsdam, Germany Niedermann, Samuel Samuel Niedermann 0000-0003-1626-5284 GFZ Helmholtz Centre for Geosciences, Potsdam, Germany Wilke, Franziska D.H. Franziska D.H. Wilke 0000-0002-3463-6176 GFZ Helmholtz Centre for Geosciences, Potsdam, Germany Zimmer, Martin Martin Zimmer 0000-0002-8848-2336 GFZ Helmholtz Centre for Geosciences, Potsdam, Germany Woith, Heiko Heiko Woith 0000-0001-7662-7780 GFZ Helmholtz Centre for Geosciences, Potsdam, Germany Glodny, Johannes Johannes Glodny 0000-0002-7812-5933 GFZ Helmholtz Centre for Geosciences, Potsdam, Germany Geissler, Wolfram H. Wolfram H. Geissler 0000-0001-6807-555X Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany Kämpf, Horst Horst Kämpf 0000-0001-7702-6012 GFZ Helmholtz Centre for Geosciences, Potsdam, Germany GFZ Data Services 2025 p-T estimations noble gases Variscan Orogeny Subcontinental Lithospheric Mantle EARTH SCIENCE > SOLID EARTH > GEOCHEMISTRY EARTH SCIENCE > SOLID EARTH > GEOCHEMISTRY > GEOCHEMICAL PROCESSES EARTH SCIENCE > SOLID EARTH > GEOCHEMISTRY > GEOCHEMICAL PROPERTIES > ISOTOPE RATIOS EARTH SCIENCE > SOLID EARTH > GEOCHEMISTRY > GEOCHEMICAL PROPERTIES > ISOTOPES EARTH SCIENCE > SOLID EARTH > GEOMORPHIC LANDFORMS/PROCESSES > TECTONIC LANDFORMS > GRABEN Daskalopoulou, Kyriaki Kyriaki Daskalopoulou 0000-0002-5637-2984 Institute of Geosciences, University of Potsdam, Potsdam, Germany Daskalopoulou, Kyriaki Kyriaki Daskalopoulou 0000-0002-5637-2984 Institute of Geosciences, University of Potsdam, Potsdam, Germany Daskalopoulou, Kyriaki Kyriaki Daskalopoulou 0000-0002-5637-2984 Institute of Geosciences, University of Potsdam, Potsdam, Germany Daskalopoulou, Kyriaki Kyriaki Daskalopoulou 0000-0002-5637-2984 Institute of Geosciences, University of Potsdam, Potsdam, Germany Niedermann, Samuel Samuel Niedermann 0000-0003-1626-5284 GFZ Helmholtz Centre for Geosciences, Potsdam, Germany Niedermann, Samuel Samuel Niedermann 0000-0003-1626-5284 GFZ Helmholtz Centre for Geosciences, Potsdam, Germany Niedermann, Samuel Samuel Niedermann 0000-0003-1626-5284 GFZ Helmholtz Centre for Geosciences, Potsdam, Germany Wilke, Franziska D.H. Franziska D.H. Wilke 0000-0002-3463-6176 GFZ Helmholtz Centre for Geosciences, Potsdam, Germany Wilke, Franziska D.H. Franziska D.H. Wilke 0000-0002-3463-6176 GFZ Helmholtz Centre for Geosciences, Potsdam, Germany Wilke, Franziska D.H. Franziska D.H. Wilke 0000-0002-3463-6176 GFZ Helmholtz Centre for Geosciences, Potsdam, Germany Wilke, Franziska D.H. Franziska D.H. Wilke 0000-0002-3463-6176 GFZ Helmholtz Centre for Geosciences, Potsdam, Germany Zimmer, Martin Martin Zimmer 0000-0002-8848-2336 GFZ Helmholtz Centre for Geosciences, Potsdam, Germany Woith, Heiko Heiko Woith 0000-0001-7662-7780 GFZ Helmholtz Centre for Geosciences, Potsdam, Germany Woith, Heiko Heiko Woith 0000-0001-7662-7780 GFZ Helmholtz Centre for Geosciences, Potsdam, Germany Glodny, Johannes Johannes Glodny 0000-0002-7812-5933 GFZ Helmholtz Centre for Geosciences, Potsdam, Germany Glodny, Johannes Johannes Glodny 0000-0002-7812-5933 GFZ Helmholtz Centre for Geosciences, Potsdam, Germany Geissler, Wolfram H. Wolfram H. Geissler 0000-0001-6807-555X Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany Geissler, Wolfram H. Wolfram H. Geissler 0000-0001-6807-555X Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany Geissler, Wolfram H. Wolfram H. Geissler 0000-0001-6807-555X Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany Kämpf, Horst Horst Kämpf 0000-0001-7702-6012 GFZ Helmholtz Centre for Geosciences, Potsdam, Germany Kämpf, Horst Horst Kämpf 0000-0001-7702-6012 GFZ Helmholtz Centre for Geosciences, Potsdam, Germany Noble Gas Lab (GFZ Helmholtz Centre for Geosciences, Germany) GFZ Helmholtz Centre for Geosciences, Potsdam, Germany Sample Preparation (UP - University of Potsdam, Germany) Institute of Geosciences, University of Potsdam, Potsdam, Germany Microprobe Lab (GFZ Helmholtz Centre for Geosciences, Germany) GFZ Helmholtz Centre for Geosciences, Potsdam, Germany Daskalopoulou, Kyriaki Institute of Geosciences, University of Potsdam, Potsdam, Germany Collection 10.1016/j.chemgeo.2025.122722 10.1093/petrology/31.6.1353 10.1016/j.jvolgeores.2006.06.011 10.1016/S0016-7037(97)00102-6 10.1007/s00410-020-01768-z CC BY 4.0 The western Eger Rift in the Czech Republic is a currently inactive volcanic area characterized by earthquake swarms and degassing of mantle-derived fluids. Gases obtained from minerals and from repeatedly sampled free gases are used to trace the origin and evolution of volatiles and determine the conditions of the magma reservoir. Helium isotopes in fluids and minerals are up to 5.95 RA, with 20Ne/22Ne ratios up to ~11.0 and 21Ne/22Ne ratios up to ~0.048, suggesting a mixed atmospheric-mantle source for neon. Some crustal input may also be present. The slightly lower-than-mantle He isotopic ratios and the variability in 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 are higher than atmospheric levels and arrive up to 4680, indicating a mixture of atmospheric and mantle sources. Thermobarometry of pyroxene mineral grains reveals temperatures and pressures suggesting that the crystallization started at ~75 km depth and ended at ~20 km depth following a smooth p-T course. This implies diverse magma ascent conditions.

A total of 56 gas samples were collected from two intensively degassing areas in the western Eger Rift (Czech Republic), namely the mofette fields of Bublák and Hartoušov. From the Hartoušov mofette field, 24 gas samples of fluids ascending in two boreholes (F1:∼28 m depth and F2: ∼108 m depth) and 22 samples of gases emerging in two nearby ponds [surface expressions Hartoušov Mofette (HM) and Hartoušov Mofette South (HMS)] were taken. Ten samples were collected from a pond in the Bublák mofette field (Bbl). In addition to the gas samples, ten rock samples were collected from rock exposures [i.e. Libá (LI) and Číhaná (CI) in quarries, Horní Slavkov (HS1&2), Pila (PI), Dolní Dražov (DD), Kadaň (KN), Horní Paseky (HP), and Slapany (SL) in natural cliffs, and Hlinky (HL) in an outcrop] within the western Eger rift area. In addition, six samples of ultramafic nodules/xenoliths were obtained from the Quaternary tephra deposit of the Mýtina maar and from Železná hůrka scoria cone.
Gas and rock sampling:
Western Eger Rift area, Czech Republic 11.9531 13.9471 49.5109 50.7643 Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659 461419881 Kohlenstoff-Monitoring Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659 419880416 More - Mofetten Untersuchungen Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659 Czech–French–German BOHEMA Studienstiftung des Deutschen Volkes http://dx.doi.org/10.13039/501100004350