Determining the K-content of single-grains of feldspar for luminescence dating

Autor:	Geoffrey A. T. Duller, Nicholas J. G. Pearce, Rachel Smedley, Helen M. Roberts
Rok vydání:	2012
Předmět:	Radiation Materials science Thermoluminescence dating Mineralogy Feldspar Thermoluminescence Spectral line visual_art visual_art.visual_art_medium Signal intensity Dose rate Luminescence Instrumentation Quartz
Zdroj:	Radiation Measurements. 47:790-796
ISSN:	1350-4487
Popis:	Feldspars form a solid-solution series whereby the K-content may range from 0 to 14%. LA-ICP-MS measurements for density-separated single-grains of feldspar yielded realistic concentrations of K within the range of those naturally occurring, and also highlighted the difficulty in isolating the pure end members during density-separation. No direct relationship was found between the thermal stability of the infrared-stimulated luminescence (IRSL) signal and measured K-content of individual grains. However, the brightest IRSL and post-IR IRSL signals originated from grains with ∼12% K-content. All grains giving a measurable signal had K-content between 6 and 13%, therefore it is suggested that an internal K-content of 10 ± 2% can be assumed for routine single-grain dating of density-separated K-feldspars.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4e03737119731bf3bd84ad5c67574794 https://doi.org/10.1016/j.radmeas.2012.01.014 Zobrazit plný text záznamu Full Text from ScienceDirect