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Large Igneous Provinces, Delamination, and Fertile Mantle

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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Abstract

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.2113/gselements.1.5.271DOIUNSPECIFIED
http://elements.geoscienceworld.org/content/1/5/271.abstractPublisherUNSPECIFIED
Additional Information:© 2005 Mineralogical Society of America. December 2005.
Subject Keywords:LIPs, delamination, plumes, hotspots, lithosphere, eclogite
Record Number:CaltechAUTHORS:20121010-095610609
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20121010-095610609
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.
ID Code:34815
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:10 Oct 2012 17:44
Last Modified:10 Oct 2012 17:44

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