Computer Science
Scientific paper
Feb 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978e%26psl..38..346m&link_type=abstract
Earth and Planetary Science Letters, Volume 38, Issue 2, p. 346-354.
Computer Science
9
Scientific paper
Constituent minerals from three alpine lherzolites (Beni Bouchera, Morocco; Lanzo, Italy; and Ronda, Spain) and a clinopyroxene from the Othris complex, Greece, reveal the following range in Sr isotopic composition: clinopyroxenes, 0.70228-0.70370 orthopyroxenes, 0.70265-0.70429 and olivines, 0.70290-0.70831. Collectively the data: (1) indicate that whole-rock lherzolites (weighted recalculations of 87Sr/86Sr = 0.7025-0.7028) have isotopic compositions which attest to a simple mantle origin and not the complex models proposed to date; (2) are incompatible with the published range for alpine peridotites 0.7063-0.7290 (3) reveal either similar or different isotopic compositions for coexisting minerals, the latter possibly being the result of Rb mobility and introduction of radiogenic Sr into the peridotite system; and (4) indicate the past existence of liquids with ``alkalic'' affinities within the lherzolite framework. The lherzolites are therefore believed to be residual, having experienced a small degree of partial melting.
Menzies Martin M.
Murthy Rama V.
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