| 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. |
| Genre: | Article |
| ProdID: | 70019079 |
| Citation Author: | Liu, J.; Bohlen, S. R.; Ernst, W. G. |
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| Citation End Page: | 171 |
| Citation Issue: | 1-4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Earth and Planetary Science Letters |
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| Citation Number Of Pages: | 11 |
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| Citation Search Results Text: | Stability of hydrous phases in subducting oceanic crust; 1996; Article; Journal; Earth and Planetary Science Letters; Liu, J.; Bohlen, S. R.; Ernst, W. G. |
| Citation Start Page: | 161 |
| Citation Volume: | 143 |
| Citation Year: | 1996 |
| Type: | citation/reference |
| Text: | Stability of hydrous phases in subducting oceanic crust; 1996; Article; Journal; Earth and Planetary Science Letters; Liu, J.; Bohlen, S. R.; Ernst, W. G. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 1996 00:00 -0600 |
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