An investigation of trace and isotope light elements in mineral phases from well RN-17 (Reykjanes Peninsula, SW Iceland)

The light lithophile (Li, Be and B) and halogen (F, Cl) elements are powerful tracers of fluid transfer due to their mobility during high temperature hydrothermal processes and metamorphic devolatilisation. Moreover, although a great deal of studies have been carried out on these elements in whole r...

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Published inIOP conference series. Materials Science and Engineering Vol. 7; no. 1; p. 012026
Main Authors Raffone, N, Ottolini, L P, Tonarini, S, Gianelli, G, D'Orazio, M, Fridleifsson, G Ó
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.01.2010
Subjects
Boron isotopes
Chips
Fluid dynamics
Fluid flow
Fluids
High temperature
Isotope composition
Isotopes
Light elements
Lithium
Minerals
Phases
Plagioclase
Rock
Seawater
Secondary ion mass spectrometry
Iceland
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Summary:The light lithophile (Li, Be and B) and halogen (F, Cl) elements are powerful tracers of fluid transfer due to their mobility during high temperature hydrothermal processes and metamorphic devolatilisation. Moreover, although a great deal of studies have been carried out on these elements in whole rock and minerals of altered rocks from divergent and convergent plate margins, an inventory for mineral phases from the altered Icelandic oceanic crust is still incomplete. In the present paper we report the results of in situ EPMA and SIMS investigations on variously altered magmatic (plagioclase and clinopyroxene) and hydrothermal phases (amphibole and epidote) from selected cuttings drilled at different depths (400 -- 3000 m) of the well RN-17, Reykjanes geothermal system (SW Iceland). Our study has benefited from the use of high-magnification SEM investigations; from ICP-MS on Li, P-TIMS determinations of boron isotope composition ( Delta *d11B) and ID analyses of B contents on the whole rock. Particularly, SIMS data on epidote have shown that alteration beneath Reykjanes has been more efficient in the shallow and intermediate cuttings, while whole rock data on boron isotope composition have revealed that the alteration has been caused firstly by Delta *d11B-poor fluids and successively by Delta *d11B-rich seawater-hydrothermal fluids.
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ISSN:1757-899X
1757-8981
1757-899X
DOI:10.1088/1757-899X/7/1/012026