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Exhumation-Denudation History of the Maracaibo Block, Northwestern South America: Insights from Thermochronology

  • Mauricio A. Bermúdez
  • Matthias Bernet
  • Barry P. Kohn
  • Stephanie Brichau
Chapter
Part of the Frontiers in Earth Sciences book series (FRONTIERS)

Abstract

The Maracaibo block forms a distinct continental fragment in northwestern South America lying between the Oca-El Pilar fault (north) and the Santa Marta-Bucaramanga fault (southwest). Bounding this continental block are the Sierra Nevada de Santa Marta, Perijá, Mérida, and Macizo de Santander mountain belts. These belts were formed by complex geodynamic interactions between the Caribbean Plate, the Panamá Arc, and the South American Plate, which resulted in the reactivation of major preexisting structures or inherited discontinuities. In this study we summarize published 40Ar/39Ar, fission-track, and (U-Th)/He data. The data organization takes into account the movement of different plates in time and space, major present-day regional faults, geophysical data, and precipitation patterns permitting the identification of different tectonic blocks with contrasting cooling and exhumation histories. Unraveling the cooling history of the individual blocks leads to an improved understanding of the control of preexisting faults and regional Caribbean geodynamics on the evolution of northwestern South America.

Keywords

Maracaibo block Mérida Andes Santander Massif Santa Marta Ranges Perijá Ranges Low-temperature thermochronology Exhumation Cooling Age-elevation relationships Venezuelan Andes Sierra Nevada de Santa Marta Santander Massif Perijá Ranges Maracaibo Continental Block 40Ar/39Ar Fission-track (U-Th)/He Thermochronology Exhumation Transpressional tectonics Northwestern South America 

Abbreviations

AFT

Apatite fission-track thermochronologic method

40Ar/39Ar

Argon-argon thermochronologic method

°C/km

Units for cooling rate (Celsius degree by kilometer)

GPS

Global Position System

km/Myr

Units for exhumation rate (kilometers by million years)

Ma

Million years ago

MCB

Maracaibo continental block

Myr

Million year

NW

Northwest

SE

Southeast

SM

Santander Massif

SNSM

Sierra Nevada de Santa Marta

SP

Serranía de Perijá or Perijá ranges

U-Pb

Uranium-lead geochronologic system

(U-Th)/He

Uranium-thorium-helium thermochronologic method

VA

Venezuelan or Mérida Andes

ZFT

Zircon fission-track thermochronologic method

Notes

Acknowledgments

We thank Fabio Cediel for motivating this work. To the Universidad de Ibagué Project 15-377-INT. MAB is grateful to the BEST project, a scientific agreement between IRD (Institut de Recherche pour le Développement, France) and the Universidad de Ibagué.

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Mauricio A. Bermúdez
    • 1
  • Matthias Bernet
    • 2
  • Barry P. Kohn
    • 3
  • Stephanie Brichau
    • 4
  1. 1.Escuela de Ingeniería GeológicaUniversidad Pedagógica y Tecnológica de ColombiaSogamosoColombia
  2. 2.Institut des Sciences de la TerreUniversité Grenoble AlpesGrenobleFrance
  3. 3.School of Earth SciencesUniversity of MelbourneMelbourneAustralia
  4. 4.Geosciences Environment ToulouseUniversité Paul SabatierToulouseFrance

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