Seismological evidence for thermo-chemical heterogeneity in Earth's continental mantle
نویسندگان
چکیده
منابع مشابه
Seismological Insights into Heterogeneity Patterns in the Mantle
Both geophysical and geochemical techniques contribute to our understanding of the complex nature of the Earth’s mantle, but the two sources of information provide very different viewpoints. Most geophysical evidence provides an instantaneous snapshot of current structure, whilst geochemical evidence has much more information on age. Further, geophysical probes are naturally integrative since t...
متن کاملSeismological Constraints upon Mantle Composition
T32B-03, pp. WP193–WP194. Birch F. (1952) Elasticity and constitution of the Earth’s interior. J. Geophys. Res. 57, 227–286. Brodholt J. P. (2000) Pressure-induced changes in the compression mechanism of aluminous perovskite in the Earth’s mantle. Nature 407, 620–622. Castle J. C. and Creager K. C. (1999) A steeply dipping discontinuity in the lower mantle beneath Izu-Bonin. J. Geophys. Res. 10...
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Receiver functions derived from body waves recorded in Iceland and on the Hawaiian Islands reveal a seismic velocity discontinuity at about 1050 km depth beneath the two regions of presumed mantle upwelling. The waveforms of the converted phases from the mid-mantle discontinuity indicate a velocity increase with depth. The lack of consistent scattering found in recent systematic searches for se...
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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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Using high-resolution stacks of precursors to the seismic phase SS, we investigated seismic discontinuities associated with mineralogical phase changes approximately 410 and 660 kilometers (km) deep within Earth beneath South America and the surrounding oceans. Detailed maps of phase boundary topography revealed deep 410- and 660-km discontinuities in the down-dip direction of subduction, incon...
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ژورنال
عنوان ژورنال: Earth and Planetary Science Letters
سال: 2020
ISSN: 0012-821X
DOI: 10.1016/j.epsl.2020.116240