Stability of hydrous phases in subducting oceanic crust
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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.
Suggested Citation
Liu, J., Bohlen, S., and Ernst, W., 1996, Stability of hydrous phases in subducting oceanic crust: Earth and Planetary Science Letters, v. 143, no. 1-4, p. 161-171, https://doi.org/10.1016/0012-821X(96)00130-6.
| 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 |