Metasomatism of the sub-arc mantle inferred from trace elements in Philippine xenoliths
Article Abstract:
Analysis of the elemental composition of xenoliths from the Philippine volcanic arc shows that a substantial fraction of subducted trace elements is recycled to the surface before it is returned to the deep mantle. The patterns of trace elements in the xenoliths show that the main metasomatizing agent is not a melt but an aqueous fluid. Low levels of high-field-strength elements in arc magmas may be explained by low mantle concentrations combined with the fact that aqueous fluids are a poor transport medium for them.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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Evidence for melt segregation towards fractures in the Horoman mantle peridotite complex
Article Abstract:
Magmas in the Earth's upper mantle originate through a process of melt segregation that transfers interstitial melt from the adjacent porous rocks to fractures. Geochemical analysis of the Horoman peridotite complex, a geological formation in Hokkaido, Japan, found mineralogical variation in dunite that supports the melt segregation by dynamic forcing hypothesis over the alternative model that attributes the magmas to the passive percolation of interstitial melt due to variations in density.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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An element of recycling
Article Abstract:
Recent research based on mantle nodules from the Philippine volcanic arc shows that a substantial fraction of subducted trace elements is recycled to the surface before it is returned to the deep mantle. Some of it is released to the surface in aqueous fluids and some is brought up in magma erupted at the volcanic arc. Though the precise rates of global subduction fluxes cannot yet be determined, these findings will support their calculation.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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