Table 2.

Quartz SAR age determinations

Sample no.LocationDescriptionTotal dose rate* (mGy a−1)Stored dose (Gy)Age (ka)
2019AmargetiPalaeosol – footwall sequence0.94±0.0540.8±2.9543.4±4.0
2020Palaeosol – hanging wall sequence/unfaulted2.05±0.0856.84±4.8627.8±2.6
2021Palaeosol – footwall sequence0.83±0.0474.02±10.0389.2±13.0
2023GeroskipouPalaeosol – growth strata, on northern limb of Agia Marinouda Fold2.02±0.0859.18±2.2829.3±1.6
2025Cape KitiAeolinite – uplifted aeolinite, Cape Kiti Fault0.41±0.0322.95±2.8356.5±8.2
2026KolossiAeolinite – uplifted aeolinite, south of Kolossi Fault0.65±0.0424.77±5.9638.2±9.4
2043GeroskipouPalaeosol – growth strata, on northern limb of Agia Marinouda Fold1.44±0.0698.69±40.2368.7±28.1
2044Palaeosol – growth strata, on northern limb of Agia Marinouda Fold2.58±0.1085.35±4.1633.0±2.1
2045KolossiDeformed fluvial gravels – Kolossi Fault0.49±0.0384.58±8.7174.0±20.9
2046Fluvial gravels – overly faulted sequence0.61±0.0346.58±9.6676.6±16.5
2047Kalavasos – DrapeiaColluvium, Faulted. Strata at base of sequence0.66±0.0451.68±1.5978.3±5.3
  • Sample preparation methods are outlined in Burbidge et al. (2007) and Sanderson et al. (2007). Luminescence sensitivities (photon counts per Gy) and stored doses (Gy) were evaluated from paired subsamples of hydrofluoric (HF) acid-etched quartz and polymineral concentrates. Quartz luminescence sensitivities range between 5.14×102 and 1.71×105 photons per Gy. Full dating samples were subjected to the full set of optically stimulated luminescence (OSL) dating analysis procedures (see Sanderson et al. 2001, 2003, 2007; Burbidge et al. 2007). Present-day water contents of 3–20% were measured directly on several samples; an average value of 15±5% was used in age calculations. In-situ γ dose measurements (field γ spectrometry, FGS) were made at the time of sampling at each full dating position using a Health Physics Instruments Rainbow multi-channel analyser with a 2×2 NaI probe. Thick source β counting (TSBC; Sanderson 1988) and high resolution γ spectrometry (HRGS) were performed on dried bulk material from the tubes, and when collecting bulk material from each full dating sample. Dose rates to the quartz fraction were calculated by reconciling the TSBC, HRGS and FGS measurements in a dosimetric model (see Sanderson et al. 2003, 2007). Equivalent dose determinations were made using Risø DA15 equipment and the single aliquot regeneration procedure (cf. Murray & Wintle 2000). The material exhibited good OSL sensitivity and produced acceptable single aliquot regeneration internal quality performance. Dose distributions were evaluated using radial plotting methods, weighted histogram plots and robust statistics. See text for geological interpretation.

  • *Obtained from the combination of effective β and γ dose rates and an additional 0.185 mGy a−1 allowance for the dose rate owing to cosmic radiation (Prescott & Hutton 1994).