Other
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.312..143n&link_type=abstract
Nature (ISSN 0028-0836), vol. 312, Nov. 8, 1984, p. 143-146. Research supported by the Petroleum Research Fund.
Other
38
Chemical Composition, Earth Crust, Earth Mantle, Earth Planetary Structure, Geochemistry, Planetary Evolution, Hafnium Isotopes, Neodymium Isotopes, Petrology, Precambrian Period, Rocky Mountains (North America), Strontium Isotopes
Scientific paper
Nd and Sr isotopic data were collected from Rocky Mountain metavolcanic greenstone rock about 1700 Myr old traverse in order to determine the Nd and Sr isotopic composition of the mantle 1700 Myr ago and to assess the meaning of the isotopic data for the evolution of the upper mantle and for the petrogenesis of these and other rocks of similar ages. Initial Nd-143/Nd-144 ratios for the greenstones range from epsilon(Nd) = +3.3 to +6.5, the highest values yet observed for mid-Proterozoic rocks. These data constrain the change in epsilon(Nd) of mantle depleted of large-ion lithophile elements to be only 2-3 epsilon units over the past 1700 Myr or so, which supports the hypothesis of significant recycling of continental crust into the mantle.
Depaolo Donald J.
Nelson Bruce K.
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