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Evidence for serpentinite fluid in convergent margin systems: the example of El Salvador (central America) arc lavas. (Articolo in rivista)
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- Evidence for serpentinite fluid in convergent margin systems: the example of El Salvador (central America) arc lavas. (Articolo in rivista) (literal)
- Anno
- 2007-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1029/2006GC001508 (literal)
- Alternative label
Tonarini S.(1); Agostini S.(1); Doglioni C.(2); Innocenti F.(3,1); Manetti P.(1) (2007)
Evidence for serpentinite fluid in convergent margin systems: the example of El Salvador (central America) arc lavas.
in Geochemistry, geophysics, geosystems
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- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Tonarini S.(1); Agostini S.(1); Doglioni C.(2); Innocenti F.(3,1); Manetti P.(1) (literal)
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- Q09014, doi:10.1029/2006GC0011508 (literal)
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- 1)Istituto di Geoscienze e Georisorse, Consiglio Nazionale delle Ricerche, Via Moruzzi, 1, I-56124 Pisa, Italy
2)Dipartimento di Scienze della Terra, Universita` La Sapienza, Piazzale Aldo Moro, 5, I-00185 Rome, Italy
3)Dipartimento di Scienze della Terra, Universita` di Pisa, Via Santa Maria, 53, I-56126 Pisa, Italy (literal)
- Titolo
- Evidence for serpentinite fluid in convergent margin systems: the example of El Salvador (central America) arc lavas. (literal)
- Abstract
- 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 143Nd/144Nd ( 0.5130), and small differences in 207Pb/204Pb (15.53-15.57), whereas 87Sr/86Sr 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-d11B serpentinite fluid from serpentized mantle wedge dragged beneath the volcanic arc or from the subducting lithosphere and (2) a low-d11B 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, 11B-enriched in the forearc by shallow fluids. (literal)
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