Niobium/uranium evidence for early formation of the continental crust

Paul J. Sylvester, Ian H. Campbell, Deborah A. Bowyer

Research output: Contribution to journalArticle

103 Scopus citations

Abstract

Niobium/uranium ratios in greenstone-belt basalts and gabbros indicate that parts of the Late Archean mantle beneath Western Australia underwent a level of melt extraction, resulting in formation of the continental crust, comparable to that seen in the present mantle. The implication is either that (i) the amount of continental crust that formed before 2.7 x 109 years ago was much greater than generally thought or (ii) crustal growth occurred by severe depletion of small volumes of the mantle rather than by moderate depletion of a large volume of mantle.

Original languageEnglish
Pages (from-to)521-523
Number of pages3
JournalScience
Volume275
Issue number5299
DOIs
StatePublished - Jan 24 1997

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