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Mineralium Deposita

, Volume 38, Issue 5, pp 640–646 | Cite as

The Cretaceous iron belt of northern Chile: role of oceanic plates, a superplume event, and a major shear zone

  • Roberto OyarzunEmail author
  • Jorge Oyarzún
  • Jean Jacques Ménard
  • Javier Lillo
Letter

Abstract

The Cretaceous constitutes a turning point in the tectonic, magmatic, and metallogenic history of Chile. The geological evidence indicates that a major change occurred in late Neocomian time when superplume emplacement (Mid-Pacific Superplume) and plate reorganization processes took place in the Pacific. The superplume event resulted in a major ridge-push force resulting in increased coupling between the subducting and overriding plates. This completely changed the tectonic setting of Chile ending the Early Cretaceous extensional period (aborted rifting in the back-arc basin), and increasing stress at a crustal scale. As a consequence, overpressurized dioritic magmas were pushed up mainly along the best possible structural path in northern Chile, i.e., the Atacama Fault Zone, eventually forming a +500-km-long belt of Kiruna-type iron deposits with reserves of ~2,000 Mt (60% Fe), a unique case in Chile's geological history.

Keywords

Iron belt Cretaceous Chile Shear zone Superplume 

Notes

Acknowledgments

We would like to thank Bernd Lehmann and Robert W. King for their constructive reviews of the manuscript.

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • Roberto Oyarzun
    • 1
    Email author
  • Jorge Oyarzún
    • 2
  • Jean Jacques Ménard
    • 3
  • Javier Lillo
    • 4
  1. 1.Departamento de Cristalografía y Mineralogía, Facultad de Ciencias GeológicasUniversidad ComplutenseMadridSpain
  2. 2.Departamento de Ingeniería de Minas and CEAZA, Facultad de IngenieríaUniversidad de La SerenaLa SerenaChile
  3. 3.Institut Pédagogique NationalNouakchottMauritanie
  4. 4.Escuela Superior de Ciencias Experimentales y TecnologíaUniversidad Rey Juan CarlosMadridSpain

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