Skip to Main Content
GEOREF RECORD

Evidence for distortion of Tertiary K/Ar ages by excess argon; example given by three alkali olivine basalts from northern Hesse, Germany

Ursula Rittmann and Hans Joachim Lippolt
Evidence for distortion of Tertiary K/Ar ages by excess argon; example given by three alkali olivine basalts from northern Hesse, Germany
European Journal of Mineralogy (February 1998) 10 (1): 95-110

Abstract

Systematic K/Ar analyses of mineral concentrates from three alkali olivine basalts show that phenocrysts of olivine and pyroxene are responsible for the excess Ar component in all three rocks. There is also another component in one of the basalts resulting from hydrothermal events and/or crustal contamination. This excess Ar component is accompanied by high atmospheric Ar contributions. Groundmass separates are favourable for dating when the separation of pure minerals is not possible; in cases of strongly discrepant isotopic compositions, either isochrons or (super 40) Ar/ (super 39) Ar spectra should be measured.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 10
Serial Issue: 1
Title: Evidence for distortion of Tertiary K/Ar ages by excess argon; example given by three alkali olivine basalts from northern Hesse, Germany
Affiliation: Ruprecht-Karls-Universitaet Heidelberg, Laboratorium fuer Geochronologie, Heidelberg, Federal Republic of Germany
Pages: 95-110
Published: 199802
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 31
Accession Number: 1999-014520
Categories: Igneous and metamorphic petrologyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables, geol. sketch map
N51°00'00" - N51°00'00", E07°00'00" - E07°00'00"
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199906
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal