Stability of hydrous phases in subducting oceanic crust
Earth and Planetary Science Letters
By: J. Liu, S.R. Bohlen, and W. G. Ernst
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Abstract
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.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Stability of hydrous phases in subducting oceanic crust |
| Series title | Earth and Planetary Science Letters |
| DOI | 10.1016/0012-821X(96)00130-6 |
| Volume | 143 |
| Issue | 1-4 |
| Year Published | 1996 |
| Language | English |
| Publisher | Elsevier |
| Description | 11 p. |
| First page | 161 |
| Last page | 171 |