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Geophysics of the continental mantle: an historical perspective

Anderson, Don L. (1990) Geophysics of the continental mantle: an historical perspective. In: Continental mantle. Oxford monographs on geology and geophysics. No.16. Clarendon Press , Oxford, pp. 1-30. ISBN 9780198544968.

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The continental lithosphere is a small fraction of the Earth and cannot be understood in isolation from the rest of the planet. It is at the top of the mantle and, therefore, is probably buoyant with respect to the bulk of the upper mantle in spite of the fact that it is also the coldest part of the mantle. The shield or cratonic lithosphere is ancient. Because of its long-term stability it is probably deficient in garnet, the densest abundant mantle mineral, and/or FeO relative to the rest of the upper mantle. It has high seismic velocities; this in addition to its anisotropy favours a high olivine, possibly forsterite-rich, content. High temperatures, high pyroxene contents, and high FeO contents all serve to decrease the seismic velocities. Since melts are enriched in CaO, Al_2O_3, and FeO compared to their source rocks the immediate implication of long-term buoyancy is that the cratonic lithosphere represents, at least in part, the refractory, buoyant residue, i.e. olivine and orthopyroxene, of mantle differentiation processes. In so far as it is related to the overlying continental crust, at least in age, it may be a product of the differentiation of the whole mantle rather than just the upper mantle. The argument here is that the continental crust is so enriched in the most incompatible elements that it would require efficient processing of the whole mantle in order to obtain the observed concentrations.

Item Type:Book Section
Additional Information:© 1990 Clarendon Press. I greatly appreciate the conversations I have had with Steve Grand and Toshiro Tanimoto and they have my gratitude for allowing me the use of figures from their unpublished papers. This research was supported by NSF-EAR-8509350, California Institute of Technology Contribution Number 4775.
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Caltech Division of Geological and Planetary Sciences4775
Series Name:Oxford monographs on geology and geophysics
Issue or Number:16
Record Number:CaltechAUTHORS:20140509-083527875
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45628
Deposited By: Tony Diaz
Deposited On:09 May 2014 17:36
Last Modified:03 Oct 2019 06:33

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