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Evaluation of the 87Rb decay constant by age comparison against the U-Pb system

Nebel, Oliver; Scherer, Erik E; Mezger, Klaus

Description

The Rb-Sr decay system is one of the most widely used geochronometers for obtaining ages and cooling rates of terrestrial magmatic, metamorphic, and hydrothermal events. It has also been extensively applied to date extraterrestrial, early solar system events. The accuracy of Rb-Sr ages, however, strongly depends on the accuracy of the87Rb decay constant (λ87Rb). We determined λ87Rb relative to the decay constants of235U and238U by comparing Rb-Sr ages of minerals with U-Pb ages obtained from...[Show more]

dc.contributor.authorNebel, Oliver
dc.contributor.authorScherer, Erik E
dc.contributor.authorMezger, Klaus
dc.date.accessioned2015-12-10T23:16:22Z
dc.identifier.issn0012-821X
dc.identifier.urihttp://hdl.handle.net/1885/65027
dc.description.abstractThe Rb-Sr decay system is one of the most widely used geochronometers for obtaining ages and cooling rates of terrestrial magmatic, metamorphic, and hydrothermal events. It has also been extensively applied to date extraterrestrial, early solar system events. The accuracy of Rb-Sr ages, however, strongly depends on the accuracy of the87Rb decay constant (λ87Rb). We determined λ87Rb relative to the decay constants of235U and238U by comparing Rb-Sr ages of minerals with U-Pb ages obtained from the same intrusion. Comparison of U-Pb emplacement ages with high-precision Rb-Sr mineral ages from three rapidly cooled igneous rocks covering an age range of ca. 2.5Ga yields an unweighted mean λ87Rb of 1.393±0.004×10λ11yr-1 (i.e., ±0.3%), corresponding to a half-life of 49.76×109years. Because this decay constant is 2% lower than the presently recommended one, many previously published ages are 2% too young and the resulting geologic interpretations may need revision.
dc.publisherElsevier
dc.sourceEarth and Planetary Science Letters
dc.subjectKeywords: Age comparison; Cooling rates; Decay constants; Early solar systems; Geologic interpretation; High-precision; Rb-Sr; U-Pb ages; Decay (organic); Gallium; Igneous rocks; Lead; Minerals; Solar system; Rubidium; age determination; emplacement; rubidium-stron Age comparison; Decay constant; Rb-Sr; Rubidium
dc.titleEvaluation of the 87Rb decay constant by age comparison against the U-Pb system
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume301
dc.date.issued2011
local.identifier.absfor040303 - Geochronology
local.identifier.absfor040299 - Geochemistry not elsewhere classified
local.identifier.absfor040203 - Isotope Geochemistry
local.identifier.ariespublicationf2965xPUB1039
local.type.statusPublished Version
local.contributor.affiliationNebel, Oliver, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationScherer, Erik E, Universitat Munster
local.contributor.affiliationMezger, Klaus, University of Munster
local.description.embargo2037-12-31
local.bibliographicCitation.issue1-2
local.bibliographicCitation.startpage1
local.bibliographicCitation.lastpage8
local.identifier.doi10.1016/j.epsl.2010.11.004
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
dc.date.updated2016-02-24T08:08:21Z
local.identifier.scopusID2-s2.0-78650258096
local.identifier.thomsonID000286640400001
CollectionsANU Research Publications

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