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Seismological and geophysical signatures of the deep crustal magma systems of the Cenozoic volcanic fields beneath the Eifel, Germany

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/persons/resource/dahm

Dahm,  T.
2.1 Physics of Earthquakes and Volcanoes, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/manfred

Stiller,  Manfred
2.7 Near-surface Geophysics, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/jimmy

Mechie,  James
2.2 Geophysical Deep Sounding, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/heimann

Heimann,  Sebastian
2.1 Physics of Earthquakes and Volcanoes, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Hensch,  M.
External Organizations;

/persons/resource/radon

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

Schmidt,  B.
External Organizations;

Gabriel,  G.
External Organizations;

/persons/resource/mhw

Weber,  Michael
2.7 Near-surface Geophysics, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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5002828.pdf
(Verlagsversion), 10MB

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Zitation

Dahm, T., Stiller, M., Mechie, J., Heimann, S., Hensch, M., Woith, H., Schmidt, B., Gabriel, G., Weber, M. (2020): Seismological and geophysical signatures of the deep crustal magma systems of the Cenozoic volcanic fields beneath the Eifel, Germany. - Geochemistry Geophysics Geosystems (G3), 21, 9, e2020GC009062.
https://doi.org/10.1029/2020GC009062


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5002828
Zusammenfassung
The Quaternary volcanic fields of the Eifel (Rhineland‐Palatinate, Germany) had their last eruptions less than 13,000 years ago. Recently, deep low‐frequency (DLF) earthquakes were detected beneath one of the volcanic fields showing evidence of ongoing magmatic activity in the lower crust and upper mantle. In this work, seismic wide‐ and steep‐angle experiments from 1978/79 and 1987/88 are compiled, partially reprocessed and interpreted, together with other data to better determine the location, size, shape and state of magmatic reservoirs in the Eifel region near the crust‐mantle boundary. We discuss seismic evidence for a low‐velocity gradient layer from 30‐36 km depth, which has developed over a large region under all Quaternary volcanic fields of the Rhenish Massif and can be explained by the presence of partial melts. We show that the DLF earthquakes connect the postulated upper mantle reservoir with the upper crust at a depth of about 8 km, directly below one of the youngest phonolitic volcanic centers in the Eifel, where CO2 originating from the mantle is massively outgassing. A bright spot in the West Eifel between 6‐10 km depth represents a Tertiary magma reservoir and is seen as a model for a differentiated reservoir beneath the young phonolitic center today. We find that the distribution of volcanic fields is controlled by the Variscan lithospheric structures and terrane boundaries as a whole, which is reflected by an offset of the Moho depth, a wedge‐shaped transparent zone in the lower crust and the system of thrusts over about 120 km length.