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
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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.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=40949087949&origin=inward; http://dx.doi.org/10.1029/2006gc001508; https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2006GC001508; http://doi.wiley.com/10.1029/2006GC001508; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2006GC001508; http://georoc.mpch-mainz.gwdg.de/georoc/RefTables.asp?Refnum=10875&Citation=S.+AGOSTINI%2C+S.+TONARINI%2C+P.+MANETTI%2C+F.+INNOCENTI%2C+C.+DOGLIONI%3Cbr%2F%3EGEOCHEMISTRY+GEOPHYSICS+GEOSYSTEMS+8+%5B2007%5D; https://dx.doi.org/10.1029/2006gc001508; https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2006GC001508
American Geophysical Union (AGU)
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