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Science 7 October 1977:
Vol. 198. no. 4312, pp. 49 - 51
DOI: 10.1126/science.198.4312.49
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Articles

Two-Billion-Year Granulites in the Late Precambrian Metamorphic Basement Along the Southern Peruvian Coast

B. DALMAYRAC 1, J. R. LANCELOT 2, and A. LEYRELOUP 3

1 Laboratoire de Géologie Structurale, Office de la Recherche Scientifique et Technique Outre-Mer, Université des Sciences et Techniques du Languedoc, 34060 Montpellier Cedex, France
2 Service Commun de Géochronologie et de Géochimie Isotopique, Université des Sciences et Techniques du Languedoc
3 Laboratoire de Pétrologie, Université des Sciences et Techniques du Languedoc

Uranium-lead data indicate that the high-pressure granulitic and charnockitic nuclei within the medium-grade metamorphic complex of the Peruvian coastal area must be related to an orogenic event 2 x 109 years ago. As in western Africa and Brazil, this old granulitic basement is reworked by Late Precambrian orogeny. Its presence along the Peru-Chile Trench must be taken into account in interpreting the anomalously high strontium isotopic ratios of recent calc-alkaline volcanism.

Submitted on September 27, 1976
Revised on June 22, 1977


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