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Origins of chemical diversity of back-arc basin basalts: A segment-scale study of the Eastern Lau Spreading Center
 

Summary: Origins of chemical diversity of back-arc basin basalts:
A segment-scale study of the Eastern Lau Spreading Center
Antoine Be´zos,1,2
Ste´phane Escrig,1
Charles H. Langmuir,1
Peter J. Michael,3
and Paul D. Asimow4
Received 10 July 2008; revised 24 January 2009; accepted 6 April 2009; published 30 June 2009.
[1] We report major, trace, and volatile element data on basaltic glasses from the
northernmost segment of the Eastern Lau Spreading Center (ELSC1) in the Lau back-arc
basin to further test and constrain models of back-arc volcanism. The zero-age samples come
from 47 precisely collected stations from an 85 km length spreading center. The chemical
data covary similarly to other back-arc systems but with tighter correlations and well-
developed spatial systematics. We confirm a correlation between volatile content and apparent
extent of melting of the mantle source but also show that the data cannot be reproduced
by the model of isobaric addition of water that has been broadly applied to back-arc basins.
The new data also confirm that there is no relationship between mantle temperature and the
wet melting productivity. Two distinct magmatic provinces can be identified along the
ELSC1 axis, a southern province influenced by a ``wet component'' with strong affinities to
arc volcanism and a northern province influenced by a ``damp component'' intermediate

  

Source: Asimow, Paul D. - Division of Geological and Planetary Sciences, California Institute of Technology,

 

Collections: Geosciences