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Evidence for serpentinite fluid in convergent margin systems: The example of El Salvador (Central America) arc lavas

Geochemistry, Geophysics, Geosystems, ISSN: 1525-2027, Vol: 8, Issue: 9, Page: n/a-n/a
2007
  • 74
    Citations
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    Usage
  • 76
    Captures
  • 0
    Mentions
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Metrics Details

  • Citations
    74
    • Citation Indexes
      74
  • Captures
    76

Article Description

A comprehensive geochemical study, including B, Pb, Sr, and Nd isotopes, has been carried out on El Salvador subduction-related lavas. The rocks have arc-type incompatible element distributions with high LILE/HFSE ratios, nearly constant Nd/Nd (≈0.5130), and small differences in Pb/Pb (15.53-15.57), whereas Sr/ Sr ranges from 0.7035 to 0.7039. Boron isotopic composition varies widely, between -2.7% and +6.3%. The boron isotope signature points to involvement of fluid inputs from (1) a high-δ B serpentinite fluid from serpentized mantle wedge dragged beneath the volcanic arc or from the subducting lithosphere and (2) a low-δ B fluid from the progressive dehydration of subducted altered basaltic crust and/or sediments. The observed sample variability is explained with a model in which different proportions of serpentinite-derived (10-50%) and slab-derived fluids are added to an enriched-DMM source, triggering its partial melting. We suggest a model in which tectonic erosion, i.e., dragging down of slivers of serpentinized upper plate mantle, was responsible for the occurrence of serpentinite reservoir, B-enriched in the forearc by shallow fluids. Copyright 2007 by the American Geophysical Union.

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