Abstract

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.

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