Geodynamic setting of the Hocheifel volcanism, Western Germany

Details Geodynamic setting of the Hocheifel volcanism, Western Germany Geodynamic setting of the Hocheifel volcanism, Western Germany

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....10355f&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #10355

Physics

Scientific paper

The Hocheifel volcanic field is located in the west of the Hercynian Rhenish Massif (Western Germany) and is part of the Cenozoic Central European volcanic province. The relics of about 300 Tertiary Hocheifel volcanoes occur in a region of about 1000 km^2 (e.g., Huckenholz, 1983) in between the neighbouring Quarternary Eifel volcanic fields in the E and W. Seismic tomography has shown that the Quarternary Eifel volcanism is related to mantle plume activity (Ritter et al., 2001). However, the geodynamic setting of the Tertiary Hocheifel volcanism is not clear. New 40Ar/39Ar laser fusion dating on amphibole, feldspar and ground mass separates from 23 prominent Hocheifel volcanoes yield an age range of 44-34 Ma (Middle to Upper Eocene). Previously published conventional K-Ar Oligocene and Miocene ages cannot be confirmed and are possibly caused by radiogenic Ar loss. There appears to be an older phase of volcanism occurring along a central north striking lineament with an age progression from ca. 44 Ma (south) to 40 Ma (north). A younger phase of volcanic activity ranges from ca. 38 Ma to 34 Ma and developed to the west and to the east of the central north striking lineament. In a diagram 87Sr/86Sr_i vs. 143Nd/{144}Nd_i both Tertiary Hocheifel phases of volcanism form discrete fields, which are also different from the field defined by the Quarternary Eifel volcanism. Trace element patterns also confirm that different mantle sources are tapped by different phases of volcanic activity. Together with the relationship between age and tectonic pattern formed by the Tertiary volcanoes it appears more plausible that Hocheifel magma generation is caused by extension possibly related to early Rheingraben rifting than by hypothetic Tertiary precursor of activity of the recent Eifel plume. Huckenholz, H.G., In Fuchs et al. (eds): Plateau uplift, 121-128, 1983. Ritter, J.R.R. et al., Earth Planet. Sci. Lett. 186, 7-14, 2001.

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