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Criteria for distinguishing primary evaporite features from deformation features in sulfate evaporites

B. Charlotte Schreiber and Marc L. Helman
Criteria for distinguishing primary evaporite features from deformation features in sulfate evaporites
Journal of Sedimentary Research (July 2005) 75 (4): 525-533

Abstract

In many tectonized regions, evaporites, which served as decollement zones, are brought to the surface, where they are studied as part of the normal sedimentary succession and their internal structures are commonly treated as the primary products of deposition and synsedimentary deformation. Evaporites, however, respond to tectonism in a manner that is vastly different from other rocks in the succession. Associated limestone, dolostone, and siliciclastic beds may remain virtually unaffected by the same degree of deformation that significantly alters evaporites. Even modest differential stresses, with geologically reasonable strain rates applied at low temperatures (20-200 degrees C), result in significant recrystallization, foliation, and flow in evaporites, whereas other rocks (non-evaporites) in the same succession may show little apparent change. The large differences in physical properties between evaporites and both carbonate and siliciclastic lithologies in such tectonized sections result in evaporites that no longer reflect their original sedimentary environment because of recrystallization and plastic deformation. Yet, because their structures and fabrics may not be recognized as secondary, they can be misinterpreted as original features indicative of primary depositional environments.


ISSN: 1527-1404
EISSN: 1938-3681
Serial Title: Journal of Sedimentary Research
Serial Volume: 75
Serial Issue: 4
Title: Criteria for distinguishing primary evaporite features from deformation features in sulfate evaporites
Affiliation: Appalachian State University, Department of Geology, Boone, NC, United States
Pages: 525-533
Published: 200507
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
References: 67
Accession Number: 2005-058886
Categories: Sedimentary petrologyStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch map
N42°19'60" - N44°19'60", E09°40'00" - E12°25'00"
N42°19'60" - N43°40'00", E11°49'60" - E13°15'00"
Secondary Affiliation: Lawler, Matusky & Skelly Engineers LLP, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 200536
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