Early Paleozoic Structural Development in the Nw Argentine Basement of The Andes and Its Implication for Geodynamic Reconstruction

  1. Garry D. Mckenzie
  1. A. P. Willner1,
  2. U. S. Lottner2 and
  3. H. Miller3

Published Online: 21 MAR 2013

DOI: 10.1029/GM040p0229

Gondwana Six: Structure, Tectonics, and Geophysics

Gondwana Six: Structure, Tectonics, and Geophysics

How to Cite

Willner, A. P., Lottner, U. S. and Miller, H. (2013) Early Paleozoic Structural Development in the Nw Argentine Basement of The Andes and Its Implication for Geodynamic Reconstruction, in Gondwana Six: Structure, Tectonics, and Geophysics (ed G. D. Mckenzie), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM040p0229

Author Information

  1. 1

    Institut FüR Mineralogie, Ruhr-UniversitäT Bochum, Federal Republic of Germany

  2. 2

    Geologisch-PaläOntologisches Institut, WestfäLische Wilhelms-UniversitäT MüNster, Federal Republic of Germany

  3. 3

    Institut FüR Allgemeine Und Angewandte Geologie, Ludwig-Maximilans-UniversitäT MüNchen, Federal Republic of Germany

Publication History

  1. Published Online: 21 MAR 2013
  2. Published Print: 1 JAN 1987

ISBN Information

Print ISBN: 9780875900643

Online ISBN: 9781118664483

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Keywords:

  • Gondwana(Geology)—Congresses;
  • Geology,Structural—Congresses

Summary

Tectonometamorphic zones were defined within the lower Paleozoic basement of the NW Argentine Andes in a transitional zone between two Andean segments of different geotectonic evolution. In the Cambrian, the Pacific edge of Gondwana changed from a passive to an active continental margin. This event began with folding of a Vendian/Eocambrian sediment wedge (Puncoviscana Formation and equivalents). The effects can be traced progressively over all structural levels with exposed depth increasing from north to south. Phenomena of a second deformation are of different nature and age but mostly characterized by shear belts causing large-scale crustal imbrication. In the lower tectonic levels this phase coincides with subduction-related magmatism of Ordovician age. A flat subduction slab is supposed, somewhat steeper in the northern than in the southern segment. The following anatectic-granitic magmatism and weak deformation in the Devonian may have marked a new change to passive margin conditions.