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- W2339592007 abstract "The lithosphere-asthenosphere boundary (LAB) is characterized by a sharp reduction in seismic wave speed and increased electrical conductivity. A partial melt layer is classically proposed to explain these geophysical characteristics. However, a main question remains to be answered, e.g. how such a layer can be stable while buoyant melts should rise through the lithosphere. We measured the density and structure of carbonated alkali basalts taken as a proxy for LAB melts in situ at high pressure (P) and temperature (T) conditions. We found them to be neutrally buoyant at the P-T conditions of the LAB under continents, and provide structural insights on melt compaction mechanisms. Neutral buoyancy implies the stability of a partial melt layer at these depths. Basalts generated below the lithosphere may accumulate over time, eventually reaching several % melt. Their presence provide answers to key questions on continental" @default.
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- W2339592007 date "2012-12-03" @default.
- W2339592007 modified "2023-09-24" @default.
- W2339592007 title "Magmas trapped at depth and the continental lithosphere-asthenosphere boundary" @default.
- W2339592007 hasPublicationYear "2012" @default.
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