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Journal of the Geological Society; 2001; v. 158; issue.6; p. 881-884;
DOI: 10.1144/0016-764901-085
© 2001 Geological Society of London

Short Communication

Ascent mechanism of the Dzhabyk batholith, southern Urals: constraints from URSEIS reflection seismic profiling

D. BROWN1 & A. TRYGGVASON2

1 Instituto de Ciencias de la Tierra ‘Jaume Almera’, c/LluÍs Solé i SabarÍs s/n, 08028 Barcelona, Spain (e-mail: dbrown@ija.csic.es)
2 Swedish Geological Survey, Box 670, 75128 Uppsala, Sweden

In order to determine which of the two conflicting models for the ascent of a granitic magma (diapiric rise, or along descrete pathways) may apply in any particular case it is important to see the crust through which the melt ascended. Reflection seismic data provides a means to do this. The URSEIS seismic profile images the 2D crustal profile from the surface outcrop of the Dzhabyk batholith to the upper mantle. The batholith is c. 5 km thick, and the crust beneath it shows continuous reflectivity to depths of 20–35 km. The continuous reflectivity indicates the absence of a diapir tail, and suggests that melt ascent along descrete pathways was the more likely ascent mechanism in this case.


Keywords: Urals, melts, diapirs, dykes, seismic profiles.




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[Abstract] [PDF]