Longevity of sub-continental mantle lithosphere from osmium isotope systematics in orogenic peridotite massifs

Details Longevity of sub-continental mantle lithosphere from osmium isotope systematics in orogenic peridotite massifs Longevity of sub-continental mantle lithosphere from osmium isotope systematics in orogenic peridotite massifs

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995natur.376..159r&link_type=abstract

Nature, Volume 376, Issue 6536, pp. 159-162 (1995).

Computer Science

53

Scientific paper

ATTEMPTS to understand the formation and evolution of the sub-continental lithospheric mantle (SCLM) have been hampered by the absence of reliable time constraints, reflecting a lack of appropriate isotopic dating techniques. The most commonly used methods, involving strontium, neodymium and lead isotopes, yield ambiguous results in mantle rocks, and show no relationship with magmatic processes, as the low concentrations of these elements make them susceptible to later metasomatic disturbance. Osmium, by contrast, is much more abundant in the mantle than in the crust1, so that peridotite Os isotope ratios are largely immune to recent metasomatic imprints. This provides a way to date the magmatic processes that determine mantle major-element compositions2. We present here two examples of striking correlations between 187Os/188Os and Al2O3concentration in orogenic peridotites, and argue that these can be used to date the differentiation of the SCLM. The old ages obtained agree with associated lower-crustal Nd model ages3-5, and indicate that—in these post-Archaean terrains as well as in Archaean cratons2,6,7—SCLM can remain isolated from the convecting mantle for more than a billion years.

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