Review abstract
Nature Geoscience 1, 503 - 510 (2008)
Published online: 27 July 2008 | doi:10.1038/ngeo261
Subject Categories: Structural geology, tectonics and geodynamics | Volcanology, mineralogy and petrology
Rejuvenation and erosion of the cratonic lithosphere
Stephen F. Foley1
Cratons are the ancient cores of continents, characterized by tectonic inactivity, a thick mantle lithosphere and low heat flow. Although stable as tectonically independent units for at least the past 2 billion years, cratons have experienced episodic rejuvenation events throughout their history. The lower part of the lithosphere is first weakened and altered by impregnation of magma at a few locations, which produces local density anomalies that have a destabilizing effect. These altered zones coalesce to form linear incisions at the base of the craton. Lateral erosion of the lithosphere is further aided by small-scale convection resulting from variations in lithosphere thickness, proceeding eventually to large-scale sinking of lithospheric mantle. Oxidation of volatile-enriched mantle leads to a significant drop in melting temperature as redox processes dominate melting mechanisms in cratonic mantle. Reduced conditions dominate in the deepest lithosphere, in contrast to shallower levels where carbon — slowly accumulated as diamond — is remobilized by oxidation.
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Institute of Geosciences, University of Mainz, Becherweg 21, 55099 Mainz, Germany
e-mail: foley@uni-mainz.de
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