Source of Precambrian chemical and clastic sediments

Details Source of Precambrian chemical and clastic sediments Source of Precambrian chemical and clastic sediments

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.314..325m&link_type=abstract

Nature (ISSN 0028-0836), vol. 314, March 28, 1985, p. 325-330. Research supported by the Natural Environment Research Council an

Computer Science

27

Earth Crust, Geochemistry, Geochronology, Neodymium Isotopes, Precambrian Period, Sediments, Continental Drift, Planetary Evolution, Samarium Isotopes, Sea Water

Scientific paper

The Nd isotope composition of chemical and clastic sediments surviving from the Archaean provides no evidence for the existence of pre-4,000-Myr continental crust. Either the amounts of such crust were trivial or it was destroyed substantially by 3,800 Myr ago. Nd in major Precambrian banded iron formations was supplied largely by continental weathering, and in this respect the water masses in which they formed were analogous to the modern oceans.

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