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Crustal and mantle cycles

Anderson, Don L. (2008) Crustal and mantle cycles. Geochimica et Cosmochimica Acta, 72 (12). A24. ISSN 0016-7037. doi:10.1016/j.gca.2008.05.004.

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As Earth cooled through the eclogite transition thick-crust tectonics was replaced by delamination, plate tectonics and deep irreversible subduction. Oceanic crust (OC) is not a conveyor belt; it is replaced by material displaced out of the transition zone (TZ) by slabs. Delaminated crust is hotter and may be part of a short, shallow “subterranean” cycle (“eclogite engine"). Deep subduction is intermittent and started late in Earth history; the amount of subducted OC has therefore been overestimated. It can easily be stored in the TZ. MORB is colder and denser at depth than LCC eclogite. Today the mantle is digesting OC–irreversible plate tectonics–but is regurgitating former lower continental crust (LCC) and restites, which are buoyant at ambient temperatures.

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Additional Information:© 2008 Published by Elsevier Ltd. Available online 14 June 2008.
Issue or Number:12
Record Number:CaltechAUTHORS:20150304-101323167
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Official Citation:Goldschmidt Abstracts 2008- A, Geochimica et Cosmochimica Acta, Volume 72, Issue 12, Supplement, July 2008, Pages A1-A40, ISSN 0016-7037, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55508
Deposited By: Tony Diaz
Deposited On:04 Mar 2015 21:57
Last Modified:10 Nov 2021 20:46

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