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The Inaccessible Earth - An integrated view to its structure and composition (Paperback, Softcover reprint of the original 1st ed. 1993)
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The Inaccessible Earth - An integrated view to its structure and composition (Paperback, Softcover reprint of the original 1st ed. 1993)
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In the dozen years since the first edition appeared, there has been
a great advance in understanding of the Earth's deep interior. This
is not because there have been breakthroughs in understanding, or
even many changes of ideas, but largely because of many small
advances, often the result of improved tech niques. This has led to
a complete revision of the book. For instance, we have a much
better idea of how the cloud of gas that formed the Solar Nebula
evolved into the Sun and the planets, and of the chemical processes
that accompanied its evolution and determined the mix of elements
in the Earth. We have a better understanding of convection and how
plates are an essential part of it, and how it is accompanied by
chemical processes that have extracted the materials to build
continents. Although the major variation within the Earth is
radial, improved geophysical and geochemical techniques have made
progress in investigating and under standing the lateral
heterogeneities, and it is encouraging that when geochemists and
geophysicists talk about lateral heterogeneities they can sometimes
be referring to the same thing. Plumes have become very fashionable
as the cause of hot-spot magmatism and associated geochemical
anomalies, probably origi nating at the base of the mantle (though
clear evidence for their existence is lacking)."
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