Crustal evolution - Comments on 'The Archean-Proterozoic transition: Evidence from the geochemistry of metasedimentary rocks from Guyana and Montana' by A.K. Gibbs, C.W. Montgomery, P.A. O'Day and E.A. Erslev

Details Crustal evolution - Comments on 'The Archean-Proterozoic transition: Evidence from the geochemistry of metasedimentary rocks from Guyana and Montana' by A.K. Gibbs, C.W. Montgomery, P.A. O'Day and E.A. Erslev Crustal evolution - Comments on 'The Archean-Proterozoic transition: Evidence from the geochemistry of metasedimentary rocks from Guyana and Montana' by A.K. Gibbs, C.W. Montgomery, P.A. O'Day and E.A. Erslev

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52..785m&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 52, March 1988, p. 785-787; Comments, p. 789-792; Authors' Reply, p. 793-

Computer Science

2

Earth Crust, Geochemistry, Planetary Evolution, Sedimentary Rocks, Europium, Guyana, Montana, Rare Earth Elements

Scientific paper

This paper discusses the interpretations of Gibbs et al. (1986) concerning the nature of the exposed continental crust in the Archean and the post-Archean, which are contrary to the interpretations offered earlier by Taylor and McLennan (1985). Special consideration is given to the argument of the Gibbs et al. that the trace-element and Sr-isotopic differences recorded between Archean and post-Archean terrigenous and carbonate sedimentary rocks do not reflect distinctions in upper crustal or oceanic chemistry, but instead record differences in tectonic setting. It is suggested here that some of the differences between the Taylor and McLennan and the Gibbs positions can ultimately be related to the definition of continental crust used by Gibbs and his coworkers; the earlier interpretation of a distinct difference in the nature and composition of the Archean and post-Archean upper continental crust is reiterated.

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