期刊
QUATERNARY GEOCHRONOLOGY
卷 27, 期 -, 页码 119-130出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.quageo.2015.02.010
关键词
Potassium feldspar; IRSL; MET-pIRIR; Dose response curves; gSGC
资金
- University of Wollongong
- Australian Research Council Australian Laureate Fellowship [FL130100116]
- Australian Research Council Queen Elizabeth II Fellowship [DP1092843]
- Research Grants Council of the Hong Kong Special Administrative Region, China [7028/08P]
- China Scholarship Council
We investigated the infrared stimulated luminescence (IRSL) and post-infrared IRSL (pIRIR) signals emitted by K-feldspars from sedimentary samples from Asia, Europe and Africa using a single-aliquot multiple elevated temperature (MET) stimulation procedure. For separate aliquots of the same sample, we show that variation among the dose response curves (DRCs), or growth curves, constructed from the regenerative dose signal (L-x), the test dose signal (T-x, an indicator of luminescence sensitivity) and the sensitivity-corrected signal (L-x/T-x) can be largely eliminated by normalising the DRCs using one of the regenerative dose signals; we call this procedure 'regenerative-dose normalisation' or re-normalisation. Furthermore, for the MET-pIRIR signals measured at 250 degrees C, we find that different samples have re-normalised DRCs that follow the same growth function, despite the samples differing significantly in terms of their geological provenance, sedimentary context, equivalent dose (D-e) and luminescence sensitivity. This common feature offers the potential to establish a 'global standardised growth curve' (gSGC) for different samples of K-feldspar, and thereby enable D-e values to be estimated for a large number of single aliquots by projecting the re-normalised natural signals on to the gSGC. For the 18 samples investigated in this study, we find that D-e estimates obtained from the gSGC are consistent with those obtained using full single-aliquot regenerative dose (SAR) procedures for doses of up to similar to 1600 Gy. The establishment of a gSGC would greatly reduce the time required to date older samples using K-feldspar, as regenerative doses of several hundreds to a few thousands of Gy are typically delivered to each aliquot in each SAR cycle. (C) 2015 Elsevier B.V. All rights reserved.
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