Experimentally derived high-pressure cumulates from hydrous arc magmas and consequences for the seismic velocity structure of lower arc crust

Details Experimentally derived high-pressure cumulates from hydrous arc magmas and consequences for the seismic velocity structure of lower arc crust Experimentally derived high-pressure cumulates from hydrous arc magmas and consequences for the seismic velocity structure of lower arc crust

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3321308m&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 21, CiteID L21308

Physics

12

Geochemistry: Composition Of The Continental Crust, Mineralogy And Petrology: Subduction Zone Processes (1031, 3060, 8170, 8413), Mineralogy And Petrology: Experimental Mineralogy And Petrology, Mineralogy And Petrology: Igneous Petrology

Scientific paper

This contribution explores the consequences of experimentally derived ultramafic plutonic rocks for estimates of continental crust composition. The formation of high-pressure cumulates from primitive to evolved hydrous arc magmas was investigated in the range 0.8-1.5 GPa and 1350-800°C, to provide constraints on solid assemblages that form the roots of island arc crust. At pressures exceeding 0.8 GPa (25km), 40-60% of ultramafic cumulates are produced to obtain andesite to dacite compositions that are typical for evolved island-arc volcanic and plutonic rocks. Calculated cumulate densities are comparable or higher than upper mantle values, while seismic velocities (vp) vary continuously between 7.3 and 8 km/s, resulting in a broad crust-mantle transition. The Moho represents a plagioclase saturation boundary. Our results are consistent with seismic imaging from continental margins and island arcs, revealing that beneath an active volcanic front a sharp geophysical Moho signature is sometimes absent.

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