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Crossing the several scales of strain-accomplishing mechanisms in the hinterland of the central Andean fold–thrust belt, Bolivia

McQuarrie, Nadine and Davis, George H. (2002) Crossing the several scales of strain-accomplishing mechanisms in the hinterland of the central Andean fold–thrust belt, Bolivia. Journal of Structural Geology, 24 (10). pp. 1587-1602. ISSN 0191-8141. doi:10.1016/S0191-8141(01)00158-4.

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Depictions of structures at outcrop, regional and tectonic scales enforce horizontal shortening and vertical thickening as the predominant style of deformation at all scales within the hinterland of the central Andean fold–thrust belt. Outcrop-scale structures document a progression of strain that created: (1) flexural-slip folds, (2) fold flattening via axial-planar cleavage, (3) vertical stretching via boudinage and late-stage faulting and, finally, (4) kink folding. These examples of intraformational deformation are generally concentrated just beyond the tip lines of thrust faults, where fault-propagation folds and related structures are well developed. Fault-propagation folding accommodated the accrual of strain indicated by outcrop-scale structures while the structures themselves indicate how deformation developed within each individual fold. Fault-propagation fold geometries at a regional scale emerge from the construction of regional balanced cross-sections. The sections were drawn with careful attention to: (1) known map relationships, (2) field inspection of key contacts, (3) bedding–orientation data, (4) local seismic control, and (5) principles of balance. The pervasive ESE–WNW shortening and vertical elongation seen at the outcrop and regional scales developed during the formation of the central Andean backthrust belt in the hinterland of the Andes. The central Andean backthrust belt is a large-scale west-vergent thrust system along the western side of the Eastern Cordillera in the generally east-vergent Andean fold–thrust belt of Bolivia. Strain accrual within this west-verging zone of deformation is proposed to be a taper-building mechanism that allowed the fold–thrust belt to continue propagating eastward.

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Additional Information:© 2002 Elsevier Ltd. Received 14 November 2000, Revised 28 October 2001, Accepted 29 October 2001, Available online 2 December 2001. This research was supported through a research grant from the National Science Foundation (INT-9907204), American Association of Petroleum Geologists, Geological Society of America, and the University of Arizona Geostructures Partnership. Logistics and access to field sites were provided by Juan Huachani, Sohrab Tawackoli, and Marcelo Claure Zapata of Sergeomin (La Paz). Access to seismic lines was possible through the generosity of Yacimientos Petroleros Fiscales Bolivianos (YPFB), especially Ramberto Quevedo Villagomez and William McKenney (YPFB), and German Saenz Campuzano and Dulfredo Villa Murillo of Prosis. We also thank Gautam Mitra, João Hippertt and an anonymous reviewer for their time and comments.
Funding AgencyGrant Number
American Association of Petroleum GeologistsUNSPECIFIED
Geological Society of AmericaUNSPECIFIED
University of ArizonaUNSPECIFIED
Subject Keywords:Fold–thrust belt; Strain; Bolivian Andes; Deformation processes
Issue or Number:10
Record Number:CaltechAUTHORS:20170526-091812962
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Official Citation:Nadine McQuarrie, George H Davis, Crossing the several scales of strain-accomplishing mechanisms in the hinterland of the central Andean fold–thrust belt, Bolivia, Journal of Structural Geology, Volume 24, Issue 10, October 2002, Pages 1587-1602, ISSN 0191-8141, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:77800
Deposited By: Tony Diaz
Deposited On:26 May 2017 17:30
Last Modified:15 Nov 2021 17:34

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