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Classification of melanges

Loren A. Raymond
Classification of melanges (in Melanges; their nature, origin and significance, Loren A. Raymond (editor))
Special Paper - Geological Society of America (1984) 198: 7-20


Melanges and related rock bodies have been defined, described, and classified in a variety of ways. Classifications, divisible into eight types, reflect specific definitions of the term melange. Although melanges were originally considered to be tectonic in origin, currently the term is used widely in a descriptive rather than a genetic sense. Melanges are here defined as bodies of rock mappable at a scale of 1:24000 or smaller and characterized both by the lack of internal continuity of contacts or strata and by the inclusion of fragments and blocks of all sizes, both exotic and native, in a fragmented matrix of finer-grained material. Matrix composition and fabric are rejected as definitive criteria. Progressive fragmentation and mixing of original sedimentary, igneous, and/or metamorphic protoliths give rise to broken formations, dismembered formations, and melanges--three classes of unit that, together with formations, represent a continuum of rock bodies ranging from coherent stratified units at one extreme to chaotically mixed masses at the other. Melanges may originate through sedimentary processes, diapiric processes, tectonic processes, or combinations of these processes, and are classified accordingly.

ISSN: 0072-1077
EISSN: 2331-219X
Serial Title: Special Paper - Geological Society of America
Serial Volume: 198
Title: Classification of melanges
Title: Melanges; their nature, origin and significance
Author(s): Raymond, Loren A.
Author(s): Raymond, Loren A.editor
Affiliation: Appalachian State Univ., Dep. Geol., Boone, NC, United States
Affiliation: Appalachian State Univ., Dep. Geol., Boone, NC, United States
Pages: 7-20
Published: 1984
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 0-8137-2198-9
Meeting name: 1981 annual meeting of the Geological Society of America ; Melanges; their nature, origin and significance
Meeting location: Cincinnati, OH, USA, United States
Meeting date: 19811102Nov. 2-5, 1981
References: 99
Accession Number: 1986-000537
Categories: Structural geology
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus.
N53°10'00" - N53°30'00", W04°45'00" - W04°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1986
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