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Petrographic classification of unusual high-pressure metamorphic rocks

Roberto Giustetto and Roberto Compagnoni
Petrographic classification of unusual high-pressure metamorphic rocks
European Journal of Mineralogy (October 2014) 26 (5): 635-642

Abstract

A great number of prehistoric stone implements from Western Europe are made of high-pressure (HP) metamorphic lithotypes, such as Na-pyroxenites and fine-grained eclogites. These rocks represent minor "accessory" lithologies that occur as either small primary outcrops or secondary clastic deposits derived from erosion of the former. Due to their scarcity, these lithologies have been partly neglected by the Subcommission on the Systematics of Metamorphic Rocks (SCMR) of the International Union of Geological Sciences (IUGS). Their archaeometric relevance, however, is important. A new petrographic classification of these HP metamorphic lithotypes is presented here, which is consistent with the recommendations of the SCMR. Two simple diagrams are suggested, which are useful to classify "jades", mainly consisting of Na-pyroxenes, and rocks mainly consisting of Na-pyroxenes and garnets. Other unusual HP rocks, sometimes used to make archaeological implements, are also considered and classified according to a serious petrographic approach.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 26
Serial Issue: 5
Title: Petrographic classification of unusual high-pressure metamorphic rocks
Affiliation: University of Turin, Department of Earth Sciences, Turin, Italy
Pages: 635-642
Published: 201410
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 47
Accession Number: 2014-085358
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201444
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