Determining the K-content of single-grains of feldspar for luminescence dating |
| |
Authors: | RK Smedley GAT Duller NJG Pearce HM Roberts |
| |
Institution: | Institute of Geography and Earth Sciences, Aberystwyth University, Ceredigion, SY23 3DB, UK |
| |
Abstract: | 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. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|