Stability of hydrous phases in subducting oceanic crust

Details Stability of hydrous phases in subducting oceanic crust Stability of hydrous phases in subducting oceanic crust

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996e%26psl.143..161l&link_type=abstract

Earth and Planetary Science Letters, Volume 143, Issue 1-4, p. 161-171.

Physics

25

Scientific paper

Experiments in the basalt-H2O system at 600-950°C and 0.8-3.0 GPa, demonstrate that breakdown of amphibole represents the final dehydration of subducting oceanic tholeiite at T >= 650°C the dehydration H2O occurs as a free fluid or in silicate melt co-existing with an anhydrous eclogite assemblage. In contrast, about 0.5 wt% of H2O is stored in lawsonite at 600°C, 3.0 GPa. Our results suggest that slab melting occurs at depths shallower than 60 km for subducting young oceanic crust; along a subduction zone with an average thermal gradient higher than 7°C/km, H2O stored in hydrated low-potassium, metabasaltic layers cannot be subducted to depths greater than 100 km, then released to generate arc magma.

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