A teleseismic and petrological study of the crust and upper mantle beneath the geothermal anomaly Urach/SW-Germany

Details A teleseismic and petrological study of the crust and upper mantle beneath the geothermal anomaly Urach/SW-Germany A teleseismic and petrological study of the crust and upper mantle beneath the geothermal anomaly Urach/SW-Germany

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pepi...69..176g&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 69, Issue 3-4, p. 176-206.

Physics

15

Scientific paper

Teleseismic P-wave travel time residuals recorded by a mobile, shortperiod network are interpreted using the composition of crustal and upper mantle xenoliths. A three-dimensional inversion of the P residuals revealed a small-scale anomalous domain with a velocity reduction of 3% in the crust and a broad low-velocity anomaly of 4% beneath the Moho down to a depth of 50 km. Xenoliths of the Miocene Urach volcanic field (``UVF'', 1300 km2; 355 eruptive centres, mostly diatremes) comprise phlogopite-bearing, clinopyroxene-rich mantle xenoliths, evidence for large ion lithophile element (LIL) metasomatism in an originally depleted harzburgitic mantle, reflecting chemical modification of the upper mantle beneath the UVF. The metasomatism caused partial melting in the spinel peridotite stability field, indicated by glasses in xenoliths, and a diapiric uprise of the partially molten metasomatized mantle. The observed reduction of the P-wave velocity of 4% in the lithospheric mantle can be explained by a local enrichment of phlogopite accompanied by increased temperatures. The crustal low-velocity body coincides very well with the postulated volume of an ancient intracrustal magma chamber or system of chambers required by the composition of xenoliths, the magnetization of the diatremes and the spatial distribution of the volcanic eruption centres.

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