Nd-Sr isotopic relationship in granitoid rocks and continental crust development: a chemical approach to orogenesis

Details Nd-Sr isotopic relationship in granitoid rocks and continental crust development: a chemical approach to orogenesis Nd-Sr isotopic relationship in granitoid rocks and continental crust development: a chemical approach to orogenesis

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.286..335a&link_type=abstract

Nature, Volume 286, Issue 5771, pp. 335-342 (1980).

Mathematics

Logic

55

Scientific paper

Nd and Sr isotopic compositions of young granitoid rocks from diverse locations show that none of them is derived from an oceanic mantle. Instead a large amount of recycled older continental crust must be involved in their genesis. In contrast old granitoids (older than 2,000 Myr) seem to have initial isotopic ratios of Nd and Sr quite close to the planetary mantle evolution line. These observations are interpreted as evidence of a quasi-continuous continental growth through geological time. We propose a mixing model to explain quantitatively the generation of granitoids from mantle and recycled continental materials.

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