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Geochemistry, tectonomagmatic origin and chemical correlation of altered Carboniferous-Permian fallout ash tuffs in southwestern Germany

Stephan Koeniger and Volker Lorenz
Geochemistry, tectonomagmatic origin and chemical correlation of altered Carboniferous-Permian fallout ash tuffs in southwestern Germany
Geological Magazine (September 2002) 139 (5): 541-558

Abstract

Thin, but laterally widespread, fallout ash tuff layers interbedded with complex fluviolacustrine successions of the Carboniferous-Permian late Variscan intermontane Saar-Nahe Basin in SW Germany provide important tephrostratigraphic markers in the purely continental depositional setting. The tuffs are rhyolitic to rhyodacitic and indicate geochemical affinities to Moldanubian Variscan S-type granitic rocks. The volcanic ashes may have been derived from the general region of the central and N Black Forest (SW Germany) and the N Vosges (E France) at 100-150 km S of the Saar-Nahe Basin. Six tuff beds from the Jeckenbach and Odernheim subformations (Meisenheim formation, Glan group) have been correlated within the basin over a distance of 50 km by mapping and whole-rock geochemical fingerprinting. In each subformation three tuffs can be well distinguished using geochemical discriminant function analysis. Additional comparisons of trace and REE element contents provide further criteria for the differentiation of individual tuff beds. These discriminations show that the tuffs have unique chemical fingerprints, probably reflecting differences in the original composition of the parent volcanic tephra. Thus, chemical differences between the tephrostratigraphic makers are geologically significant and provide a powerful tool for establishing tuff layer identification and correlation within the complex sedimentary sequence of the Saar-Nahe Basin. They also provide clues to the tectonomagmatic settings of the source volcanoes.


ISSN: 0016-7568
EISSN: 1469-5081
Coden: GEMGA4
Serial Title: Geological Magazine
Serial Volume: 139
Serial Issue: 5
Title: Geochemistry, tectonomagmatic origin and chemical correlation of altered Carboniferous-Permian fallout ash tuffs in southwestern Germany
Affiliation: Julius-Maximilians-Universitaet Wuerzburg, Institut fuer Geologie, Wurzburg, Federal Republic of Germany
Pages: 541-558
Published: 200209
Text Language: English
Publisher: Cambridge University Press, London, United Kingdom
References: 75
Accession Number: 2003-025964
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables, geol. sketch map
N49°36'00" - N49°36'00", E07°40'00" - E08°00'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 200309
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