Structural and thermochronologic constraints on kinematics and timing of inversion of the Salta rift in the Tonco-Amblayo sector of the Andean retroarc fold-thrust belt, northwestern Argentina

Research output: Chapter in Book/Report/Conference proceedingChapter

6 Scopus citations

Abstract

Inherited architecture of the Cretaceous Salta rift is a primary influence on Andean deformation in northwestern Argentina. The Tonco-Amblayo thrust belt (TATB) of the Eastern Cordillera exhibits a complex interplay between thick-skinned and thin-skinned shortening styles, controlled by reactivated Salta rift normal faults. Geological mapping, cross-sections, and apatite (U-Th)/He dating document Miocene shortening and exhumation. Regional structures comprise basement-involved reverse faults and steep-overturned fault-propagation folds. Inversion of east-dipping normal faults results in a hindward verging back-thrust belt. Apatite (U-Th)/He data document eastward younging cooling ages from ~12Ma to ~6Ma, suggesting that deformation propagated forward. Kinematic models require structure at depth to accommodate changes in structural elevation and basement shortening. Basement wedging, by a single thrust sheet or passive-roof duplex, provides a kinematically viable model. Shortening in the Eastern Cordillera is ~36% (53km). Revised total shortening (~118km) falls short of solving shortening discrepancies suggested by crustal thickness.

Original languageEnglish (US)
Title of host publicationAndean Tectonics
PublisherElsevier Inc.
Pages429-464
Number of pages36
ISBN (Electronic)9780128160091
ISBN (Print)9780128160107
DOIs
StatePublished - Jan 1 2019

Keywords

  • Andes
  • Argentina
  • Balanced cross-section
  • Eastern Cordillera
  • Fold-thrust belt
  • Rift inversion
  • Thermochronology

ASJC Scopus subject areas

  • General Earth and Planetary Sciences

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