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When do folds unfold during progressive shear?

Maria-Gema Llorens, Paul D. Bons, Albert Griera and Enrique Gomez-Rivas
When do folds unfold during progressive shear?
Geology (Boulder) (March 2013) 41 (5): 563-566


Folded layers in rocks can be stretched again, potentially unfolding the folds back to straight layers. Little is known, however, about how to recognize partly or even entirely unfolded layers. When folded layers can unfold, what determines their mechanical behavior, and how can we recognize them in the field? In order to address these questions, we present a series of numerical simulations of the stretching of previously folded single layers and multilayers in simple shear. Layers do not completely unfold when they undergo softening before or during the stretching process, or when adjacent competent layers prevent them from unfolding. Intrafolial folds and cusp-like folds adjacent to straight layers as well as variations in fold amplitudes and limb lengths of irregular folds are indicative of stretching of a fold train.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 41
Serial Issue: 5
Title: When do folds unfold during progressive shear?
Affiliation: Eberhard Karls University of Tuebingen, Department of Geosciences, Tubingen, Germany
Pages: 563-566
Published: 20130318
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 70
Accession Number: 2013-030723
Categories: Structural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: Universitat Autonoma de Barcelona, ESP, Spain
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201319
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