Mathematics – Logic
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979gecoa..43..999d&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 43, July 1979, p. 999-1008.
Mathematics
Logic
26
Earth Mantle, Evolution (Development), Neodymium, Samarium, Abundance, Gabbro, Geological Surveys, Rocks
Scientific paper
The Stillwater layered mafic intrusive complex in southern Montana is studied by means of Sm-Nd and Rb-Sr isotope analysis in order to investigate the applicability of Sm-Nd dating to crystallization age determinations of terrestrial mafic rocks and to study the chemical evolution of the mantle. Internal isochrons determined for samples ranging from anorthosite through gabbro to pyroxenite by the Sm-Nd method indicate an age of 2701 + or - 8 million years, while results of Rb-Sr isotopic measurements show more recent disturbances. The Nd-143/Nd-144 value obtained (0.508248) is found to deviate substantially from the chondritic uniform reservoir evolution curve, implying either early mantle layering with substantial REE fractionation, or REE contamination from older continental crust. It is concluded that the Sm-Nd system appears to be sufficiently resistant to weak metamorphic events to allow the precise dating of ancient terrestrial rocks.
Depaolo Donald J.
Wasserburg Gerald J.
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