Document Detail

Mantle wedge control on back-arc crustal accretion.
MedLine Citation:
PMID:  11919628     Owner:  NLM     Status:  PubMed-not-MEDLINE    
At mid-ocean ridges, plate separation leads to upward advection and pressure-release partial melting of fertile mantle material; the melt is then extracted to the spreading centre and the residual depleted mantle flows horizontally away. In back-arc basins, the subducting slab is an important control on the pattern of mantle advection and melt extraction, as well as on compositional and fluid gradients. Modelling studies predict significant mantle wedge effects on back-arc spreading processes. Here we show that various spreading centres in the Lau back-arc basin exhibit enhanced, diminished or normal magma supply, which correlates with distance from the arc volcanic front but not with spreading rate. To explain this correlation we propose that depleted upper-mantle material, generated by melt extraction in the mantle wedge, is overturned and re-introduced beneath the back-arc basin by subduction-induced corner flow. The spreading centres experience enhanced melt delivery near the volcanic front, diminished melting within the overturned depleted mantle farther from the corner and normal melting conditions in undepleted mantle farther away. Our model explains fundamental differences in crustal accretion variables between back-arc and mid-ocean settings.
Fernando Martinez; Brian Taylor
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Nature     Volume:  416     ISSN:  0028-0836     ISO Abbreviation:  Nature     Publication Date:  2002 Mar 
Date Detail:
Created Date:  2002-03-28     Completed Date:  2002-05-14     Revised Date:  2003-11-03    
Medline Journal Info:
Nlm Unique ID:  0410462     Medline TA:  Nature     Country:  England    
Other Details:
Languages:  eng     Pagination:  417-20     Citation Subset:  -    
Hawaii Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA.
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