Evidence for extreme mantle fractionation in early Archaean ultramafic rocks from northern Labrador

Details Evidence for extreme mantle fractionation in early Archaean ultramafic rocks from northern Labrador Evidence for extreme mantle fractionation in early Archaean ultramafic rocks from northern Labrador

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.349..209c&link_type=abstract

Nature (ISSN 0028-0836), vol. 349, Jan. 17, 1991, p. 209-214. Research supported by NSF and NASA.

Computer Science

24

Crustal Fractures, Earth Mantle, Neodymium Isotopes, Rock Mechanics, Samarium Isotopes, Chemical Composition, Earth Crust, Labrador, Lithosphere, Rare Earth Elements

Scientific paper

Samarium-neodymium isotope data for tectonically interleaved fragments of lithospheric mantle and meta-komatiite from the North Atlantic craton provide the first direct record of mantle differentiation before 3,800 Myr ago. The results confirm the magnitude of light-rare-earth-element depletion in the early mantle, and also its depleted neodymium isotope composition. The mantle fragments were able to retain these ancient geochemical signatures by virtue of having been tectonically incorporated in buoyant felsic crust, thus escaping recycling and homogenization by mantle convection.

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