Composition of the ancient north American crust

Kent C. Condie*

*Corresponding author for this work

Research output: Contribution to journalArticle

8 Citations (Scopus)


Abstract. 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 × 10 9 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.

Original languageEnglish
Pages (from-to)1015-1017
Number of pages3
Issue number3765
Publication statusPublished - 1967
Externally publishedYes

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