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Large igneous provinces, delamination, and fertile mantle

Don L. Anderson
Large igneous provinces, delamination, and fertile mantle (in Large igneous provinces; origin and environmental consequences, Andrew D. Saunders (editor))
Elements (December 2005) 1 (5): 271-275

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.


ISSN: 1811-5209
Serial Title: Elements
Serial Volume: 1
Serial Issue: 5
Title: Large igneous provinces, delamination, and fertile mantle
Title: Large igneous provinces; origin and environmental consequences
Author(s): Anderson, Don L.
Author(s): Saunders, Andrew D.editor
Affiliation: California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States
Affiliation: University of Leicester, Department of Geology, Leicester, United Kingdom
Pages: 271-275
Published: 200512
Text Language: English
Publisher: Mineralogical Society of America and Mineralogical Society of Great Britain and Ireland and Mineralogical Association of Canada and Geochemical Society and Clay Minerals Society, International
References: 36
Accession Number: 2006-049313
Categories: Igneous and metamorphic petrologySolid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch map
Country of Publication: International
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200614
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