= David M. Fountain
{c}
<David M. Fountain> coauthored a synthesis of lower-crustal <petrology>, <geochemistry> and seismic observations to investigate the composition of <continental crust>.<Nature and composition of the continental crust: A lower crustal perspective by Roberta L. Rudnick and David M. Fountain>[Synthesis of seismic and compositional constraints]{ref}
Wave speeds alone do not specify a unique rock composition because pressure, temperature and mineral assemblages affect the elastic response. Combining them with sampled rocks and chemical budgets helps test candidate lower-crustal models and the differences between upper and deeper crust.
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