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Experimental slip distribution in lentils as an analog for scaly clay fabrics

Matthew S. Tarling and Christie D. Rowe
Experimental slip distribution in lentils as an analog for scaly clay fabrics
Geology (Boulder) (March 2016) 44 (3): 183-186


Scaly fabrics are networks of anastomosing shear surfaces that are ubiquitous in deformed clay-rich sediments and fault gouges. Despite common occurrence, little is known about their behavior during deformation. It is not known whether they represent incremental slip on individual wavy shear surfaces, or whether multiple shear surfaces across a network deform simultaneously. We performed experiments on analog materials (oriented lentils) to observe the distribution of slip surfaces using a transparent shear box. We find that slip distributes through a network of anastomosing, transient slip surfaces that continually reorganize during shear. This is accompanied by local compaction and dilation so that volume changes caused by slip are balanced laterally between adjacent volumes. Lentils differ from equant granular materials because the shape inhibits grain rotation and facilitates interlocking. The self-perpetuating delocalization behavior of the system serves as a model for a conceptual understanding of how scaly fabrics deform and persist in natural clay-rich sediments and fault gouges.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 44
Serial Issue: 3
Title: Experimental slip distribution in lentils as an analog for scaly clay fabrics
Affiliation: McGill University, Department of Earth and Planetary Sciences, Mntreal, QC, Canada
Pages: 183-186
Published: 201603
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 32
Accession Number: 2016-028226
Categories: Structural geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2016055
Illustration Description: illus.
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, 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: 201614
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