Effective buoyancy ratio: a new parameter for characterizing thermo-chemical mixing in the Earth's mantle
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15 صفحه اولPartial melting in a thermo-chemical boundary layer at the base of the mantle
Seismological detections of complex structures in the lowermost mantle boundary layer (the D′′ region) motivate a conceptual model of a compositionally stratified thermo-chemical boundary layer (TCBL) within which lateral temperature variations (sustained by large-scale mid-mantle flow) cause variations of partial melt fraction. Partial melt fractions of from 0 to 30% in the TCBL occur due to t...
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[1] The thermal boundary layer beneath continental cratons extends into the Earth’s mantle to depths of at least 200 km. It has been proposed that chemical depletion of the lithospheric mantle during partial melting offsets the effect of increased density from conductive cooling, resulting in neutral buoyancy with respect to the underlying asthenosphere. Mineral compositions of garnet peridotit...
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Peter E. van Keken1, Erik H. Hauri2, and Chris J. Ballentine3 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109-1063; e-mail: [email protected] 2Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road, NW, Washington DC 20015; e-mail: [email protected] 3Department of Earth Sciences, University of Manchester, Manchester M1...
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ژورنال
عنوان ژورنال: Solid Earth
سال: 2015
ISSN: 1869-9529
DOI: 10.5194/se-6-93-2015