Slab melting and slab melt metasomatism in the Northern Andean Volcanic Zone : adakites and high-Mg andesites from Pichincha volcano (Ecuador)

@article{Bourdon2002SlabMA,
  title={Slab melting and slab melt metasomatism in the Northern Andean Volcanic Zone : adakites and high-Mg andesites from Pichincha volcano (Ecuador)},
  author={E. Bourdon and J. Eissen and M. Gutscher and M. Monzier and P. Samaniego and C. Robin and C. Bollinger and J. Cotten},
  journal={Bulletin De La Societe Geologique De France},
  year={2002},
  volume={173},
  pages={195-206}
}
Situated in the fore-arc of the Northern Volcanic Zone (NVZ) of the Andes in Ecuador, Pichincha volcano is an active edifice where have been erupted unusual magmas as adakites and high-Mg andesites. The particular geodynamic setting of the ecuadorian margin (i.e. the flat subduction of the Carnegie Ridge) suggests that thermo-barometric conditions for the partial melting of the oceanic crust are accomplished beneath this volcano. Pichincha adakites possess all the geochemical and isotopic… Expand
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TLDR
It is shown that the melting of basalt under both H2O-added and low-temperature conditions can yield extremely alkali-rich silicic liquids, the alkali content of which increases with pressure, suggesting that mantle metasomatism by slab-derived melt is a more common process than previously thought. Expand
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