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Inside the Subduction Factory (Hardcover, Volume 138)
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Discovery Miles 22 940
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Inside the Subduction Factory (Hardcover, Volume 138)
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Published by the American Geophysical Union as part of the
Geophysical Monograph Series, Volume 138.Subduction zones helped
nucleate and grow the continents, they fertilize and lubricate the
earth's interior, they are the site of most subaerial volcanism and
many major earthquakes, and they yield a large fraction of the
earth's precious metals. They are obvious targets for study--almost
anything you learn is likely to impact important problems--yet
arriving at a general understanding is notoriously difficult: Each
subduction zone is distinct, differing in some important aspect
from other subduction zones; fundamental aspects of their mechanics
and igneous processes differ from those in other, relatively
well-understood parts of the earth; and there are few direct
samples of some of their most important metamorphic and metasomatic
processes. As a result, even first-order features of subduction
zones have generated conflict and apparent paradox. A central
question about convergent margins, for instance--how vigorous
magmatism can occur where plates sink and the mantle cools--has a
host of mutually inconsistent answers: Early suggestions that
magmatism resulted from melting subducted crust have been
emphatically disproved and recently just as emphatically revived;
the idea that melting is fluxed by fluid released from subducted
crust is widely held but cannot explain the temperatures and
volatile contents of many arc magmas; generations of kinematic and
dynamic models have told us the mantle sinks at convergent margins,
yet strong evidence suggests that melting there is often driven by
upwelling. In contrast, our understanding ofwhy volcanoes appear at
ocean ridges and "hotspots"--although still presenting their own
chestnuts--are fundamentally solved problems.
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