Mantle-derived Archaean monzodiorites and trachyandesites

Details Mantle-derived Archaean monzodiorites and trachyandesites Mantle-derived Archaean monzodiorites and trachyandesites

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.310..222s&link_type=abstract

Nature (ISSN 0028-0836), vol. 310, July 19, 1984, p. 222-224.

Other

55

Earth Mantle, Geochemistry, Petrology, Rock Intrusions, Chemical Composition, Melts (Crystal Growth), Ontario, Planetary Evolution, Volcanoes

Scientific paper

Geochemical data on monzodiorites and trachyandesites from the Rainy Lake area in Ontario which are strongly enriched in large-ion lithophile elements (LILE) are presented. It is concluded that they are derived by direct melting of the mantle at depths of less than 50 km in either anhydrous or hydrous conditions. Their rare earth element abundances and initial Nd-143/Nd-144 ratios suggest that their mantle sources were enriched in LILE shortly before melting. The monzodiorites-trachyandesites and their granodioritic derivatives may comprise up to 20 percent of the exposed igneous rocks in the Rainy Lake region and Vermilion District. If these rocks are as abundant in other Archaean terranes, a significant part of the early continental crust could have formed by direct melting of LILE-enriched mantle.

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