Abstract
Methods of direct sampling, as used for crustal rocks, unfortunately cannot be applied to the study of chemical and mineralogical composition of the Earth’s mantle; only in some cases for the uppermost mantle layers, which interact with the crust by exchange of matter, are fragments or relics inserted in crustal material subject to petrographic examination. However, in the last two decades much experimental work has been performed in laboratory simulations of pressure-temperature conditions in systems of reasonably probable mantle chemical compositions (cf., e.g., Ringwood, 1975; Liu, 1977; Yagi et al., 1979; Ito et al., 1984). On the basis of these results a model of the mantle can be proposed such that its physical properties are in accordance with those observed by seismological and other measurements. This scheme requires that the relevant physical data be known for all phases that are to be included in the model. In some cases an experimental determination is possible, and the relative account of methods and results is found in Chapter 7 of this book (Weidner, this volume). However, very often it is not, either because synthetic samples are not available in the physical conditions required by the measurement (adequate dimensions or amount, single-crystal state, etc.), or because data are desired for pressure- temperature fields that cannot be attained. In these cases theoretical methods of calculating or sometimes even just estimating the required data can be very useful. The methods that are presently available and the main results obtained so far are considered and reviewed here.
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Catti, M. (1986). Theoretical Computation of Physical Properties of Mantle 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_6
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DOI: https://doi.org/10.1007/978-1-4612-4928-3_6
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