STABILITY OF HYDROUS PHASES IN SUBDUCTING OCEANIC CRUST

dc.contributor.author	Liu J.
dc.contributor.author	Bohlen S.R.
dc.contributor.author	Ernst W.G.
dc.date.accessioned	2020-11-21T07:53:51Z
dc.date.available	2020-11-21T07:53:51Z
dc.date.issued	1996
dc.identifier	https://elibrary.ru/item.asp?id=488718
dc.identifier.citation	Earth and Planetary Science Letters, 1996, , 1, 161-171
dc.identifier.issn	0012-821X
dc.identifier.uri	https://repository.geologyscience.ru/handle/123456789/19203
dc.description.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.
dc.subject	SUBDUCTION
dc.subject	OCEANIC CRUST
dc.subject	PHASE TRANSITIONS
dc.subject	WATER
dc.subject	BASALTS
dc.title	STABILITY OF HYDROUS PHASES IN SUBDUCTING OCEANIC CRUST
dc.type	Статья

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