Abstract
The chemical composition of the earth’s mantle has evaded five decades of probing by earth scientist. Questions remain as to whether the mantle is chemically layered and, if it is chemically layered, as to the scale and nature of the layering. The debate between pyrolite and eclogite, although often appearing to be settled, still surfaces with a renewed vigor. In their recent discussions, Bass and Anderson (1984) propose a layered upper mantle with both a pyrolite and an eclogite layer. The apparant disarray in defining the “bottom line” stands in contrast to the steady progress that has been made in many separate fields, placing us at the door of understanding mantle chemistry.
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Weidner, D.J. (1986). Mantle Model Based on Measured Physical Properties of Minerals. In: Saxena, S.K. (eds) Chemistry and Physics of Terrestrial Planets. Advances in Physical Geochemistry, vol 6. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-4928-3_7
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DOI: https://doi.org/10.1007/978-1-4612-4928-3_7
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