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Science 11 October 1996:
Vol. 274. no. 5285, pp. 222 - 224
DOI: 10.1126/science.274.5285.222
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Reports

Crustal Root Beneath the Urals: Wide-Angle Seismic Evidence

R. Carbonell, A. Pérez-Estaún, J. Gallart, J. Diaz, S. Kashubin, J. Mechie, R. Stadtlander, A. Schulze, J. H. Knapp, A. Morozov

Wide-angle reflection and refraction data acquired as part of the URSEIS '95 geophysical experiment across the southern Uralide orogen provide evidence for a 12- to 15-kilometer-thick crustal root, yielding a total crustal thickness of 55 to 58 kilometers. Strong reflections from the Mohorovicic discontinuity (Moho) at relatively small precritical distances suggest that the crust-mantle transition beneath the crustal root is a sharp feature. The derived P- and S-wave velocity models constrain key physical properties of the crust, including the depth of the mafic rocks of the Magnitogorsk volcanic arc and the existence of a lower crustal zone of possible basic rock enrichment beneath the East Uralian zone.

R. Carbonell, A. Pérez-Estaún, J. Gallart, J. Diaz, Instituto de Ciencias de la Tierra, Consejo Superior de Investigaciones Cientificas-Barcelona, 08028 Spain.
S. Kashubin, Bazhenov Geophysical Expedition, Scheelite, 624051 Russia.
J. Mechie, R. Stadtlander, A. Schulze, GeoForschungsZentrum, D-14473 Potsdam, Germany.
J. H. Knapp, Institute for the Study of the Continents, Cornell University, Ithaca, NY 145853, USA.
A. Morozov , ROSCOMNEDRA (Committee on Geology and Use of Mineral Resources of the Russian Federation), Moscow, 107140 Russia.

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