Geochronology and Nd isotopic data of Grenville-age rocks in the Colombian Andes: New constraints for Late Proterozoic-Early Paleozoic paleocontinental reconstructions of the Americas

Pedro A. Restrepo-Pace, Joaquin Ruiz, George Gehrels, Michael Cosca

Research output: Contribution to journalArticle

145 Scopus citations

Abstract

New U-Pb zircon crystallization ages and 40Ar/39Ar cooling ages from the Colombian Andes confirm the existence of rocks metamorphosed during the Orinoquian Orogenic Event (ca. 1.0 Ga) of northern South America. ∈Nd (t = 1.1 Ga) for these rocks range from -3.9 to +0.91, which is interpreted as a mixture of Late Archean-Early Proterozoic crust with juvenile material produced during the 1.1 Ga erogenic event. The Colombian Grenville age rocks are part of a much longer metamorphic pericratonal belt, sporadically exposed along the Andes, in western-central Peru, southern Bolivia and northern Argentina. In addition, Nd model (TDM) ages for the Colombian rocks range from 1.9 to 1.45 Ga, similar to those obtained in the Grenville Province of the eastern U.S. and in the Mexican basement, placing constraints on Late Proterozoic-Early Paleozoic paleocontinental reconstructions.

Original languageEnglish (US)
Pages (from-to)427-441
Number of pages15
JournalEarth and Planetary Science Letters
Volume150
Issue number3-4
StatePublished - Dec 1 1997

Keywords

  • Geochronology
  • Grenvillian Orogeny
  • Neodymium
  • Northern Andes
  • Reconstruction

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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