Comment on 'Boron content and isotopic composition of oceanic basalts: Geochemical and cosmochemical implications' by M. Chaussidon and A. Jambon

Details Comment on 'Boron content and isotopic composition of oceanic basalts: Geochemical and cosmochemical implications' by M. Chaussidon and A. Jambon Comment on 'Boron content and isotopic composition of oceanic basalts: Geochemical and cosmochemical implications' by M. Chaussidon and A. Jambon

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.128..727y&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 128, no. 3-4, p. 727-730

Computer Science

2

Basalt, Boron, Chemical Composition, Geochemistry, Interstellar Chemistry, Magma, Electron Microscopy, Hydration, Reservoirs

Scientific paper

Chaussidon and Jambon presented results of their ion microprobe study of boron concentrations and isotopic compositions in oceanic basaltic glasses. Although this study has extended the information on the geochemistry of B and delta B-11 in mid-ocean ridge basalts (E-MORB and N-MORB), back-arc basin basalts (BABB) and ocean island basalts (OIB), their calculation of the maximum amount of B recycled in subduction zones warrants special caution. They concluded that less than 2% of the B in subducted oceanic crust was added to the mantle source in order to explain the low delta B-11 values in the oceanic basalts (-7.4 - 0.6 per mil). Two comments regarding the calculation of Chaussidon and Jambon will be presented in this paper. First, sediments constitute one of the most important B reservoirs in subduction zones and should be considered in any budget calculation. Second, there is an important fractionation effect of both B and delta B-11 in the slab during subduction and this effect should be assessed.

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