Composition of the Ancient North American Crust

Details Composition of the Ancient North American Crust Composition of the Ancient North American Crust

Feb 1967

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967sci...155.1013c&link_type=abstract

Science, Volume 155, Issue 3765, pp. 1013-1015

Computer Science

Scientific paper

Geochemical studies of Wyoming Precambrian graywackes derived from continental crust older than 3.2 × 109 years indicate that their source area was at least as highly differentiated as most younger Precambrian crust. The composition of this early crust (approximately that of calcium-rich granite) is not unlike that of the 2.5 to 3.2 × 109 year old North American crust, Limited geochemical data suggest that the composition of North America may not have changed significantly during the last 3.0 to 3.5 × 109 years.

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