Anderson, Don L. (2005) Large Igneous Provinces, Delamination, and Fertile Mantle. Elements, 1 (5). pp. 271-275. ISSN 1811-5209 http://resolver.caltech.edu/CaltechAUTHORS:20121010-095610609
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When continental crust gets too thick, the dense eclogitic bottom detaches, causing uplift, asthenospheric upwelling, and pressure-release melting. Delamination introduces warm blocks of lower crust with a low melting point into the mantle; these eventually heat up, ascend, decompress, and melt. The mantle below 100 km depth is mainly below the melting point of dry peridotite, but its temperature will be above the melting point of recycled fertile (basaltic or eclogitic) components, obviating the need for excess temperature to form “hotspots” or “melting anomalies”. When plates pull apart or delaminate, the mantle upwells; entrained crustal fragments of various ages are fertile and create melting anomalies along developing mid-ocean ridges, fracture zones, and old suture zones. Eclogites associated with delamination are warmer and less dense than subducted oceanic crust and more susceptible to melting and entrainment.
|Additional Information:||© 2005 Mineralogical Society of America. December 2005.|
|Subject Keywords:||LIPs, delamination, plumes, hotspots, lithosphere, eclogite|
|Official Citation:||Don L. Anderson Large Igneous Provinces: Origin and Environmental Consequences: Large Igneous Provinces, Delamination, and Fertile Mantle ELEMENTS, December 2005, v. 1, p. (5): 271-275, doi:10.2113/gselements.1.5.271|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||10 Oct 2012 17:44|
|Last Modified:||10 Oct 2012 17:44|
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