Mantle geochemistry: the message from oceanic volcanism
Article Abstract:
Some mantle structures and processes, as well as several of the models based on it, are discussed. Basaltic volcanism can sample the Earth's mantle to great depths since solid-state convection transports deep material into the melting region. Based on the isotopic and trace-element chemistry of these basalts, the mantle is composed of some isotopically and chemically distinct components, reflecting its global evolution. This evolution is marked by upper-mantle depletion of some trace elements, possible replenishment from the deeper, less depleted mantle and the recycling of oceanic crust and lithosphere.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
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Strain-induced magma fragmentation in explosive eruptions
Article Abstract:
Volcanic explosive eruptions are distinguished by magma fragmentation, but the underlying mechanism responsible for magma fragmentation is not clear. A model has been developed where fragmentation criteria is included in the multiphase fluid-dynamic description of magma ascent. The results show the feasibility of strain-induced brittle fragmentation of magma, bringing together experimental and theoretical studies.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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Explosive volcanism may not be an inevitable consequence of magma fragmentation
Article Abstract:
Research indicates that non-explosive fragmentation due to viscous shear can occur in both effusive and explosive eruptions, which degass magma and inhibit the explosive behavior of magma.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2003
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