Mathematics – Logic
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.1683s&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 54, June 1990, p. 1683-1697. Research supported by the Research Corp.
Mathematics
Logic
19
Earth Crust, Hafnium Isotopes, Planetary Evolution, Zirconium Compounds, Canadian Shield, Continental Shelves, Neodymium Isotopes, Sandstones, Sediments
Scientific paper
Results from the fractionation of zircon by sedimentary processes into continental margin sandstone yield information on the preservation of preexisting continental crust in the form of zircon, making it possible to distinguish between the contrasting theories of gradual growth versus constant volume of continental crust over geologic time. In this work, Hf-176/Hf-177 ratios were determined for detrital zircon fractions from 2.0-2.5, 2.6-3.0, and pre-3.0 Gyr old sandstones from the Canadian-Shield, the North-Atlantic, the Wyoming, and the Kaapvaal Cratons. Results pointed to small amounts of continental crust prior to 3.0 Gyr ago and a rapid addition of continental crust between 2.5 and 3.0 Gyr ago, consistent with the gradual growth of continental crust, and giving evidence against no-growth histories.
Jonathan Patchett P.
Stevenson Ross K.
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