Potential use of the E' center as an indicator of initial resetting in TL/ESR dating of volcanic materials

An investigation of the dosimetric and kinetic properties of sand using ESR and TL techniques

“…2. Similar ESR spectra were also given for another natural (unirradiated) and irradiated sand samples in the literature (Falguères et al 1994;Toyoda and Schwarcz, 1997;Benny et al, 2000;Caldas et al, 2006;Zhao et al, 2006;Lee and Yang, 2007;Teixeira at al., 2008). The shape of ESR spectra given in Fig.…”

“…On this basis, the TL technique is used for dose estimation of minerals. Quartz is abundant in nature and natural quartz exhibits TL properties, therefore it has been used widely for TL dating in literature (Falguères et al, 1994;Tatumi et al, 2006;Afouxenidis et al, 2007). Quartz has a complex TL glow curve structure and wide variety chemical form.…”

A French story of the ESR dating method for Quaternary samples

“…Later, measurements were performed on detrital marine, aeolian sands, and on volcanic and baked sediments. In some samples, the presence of the E' center (Feigl et al, 1974) was observed at room temperature (Falguères et al, 1994). Based on laboratory annealing experiments, it seems possible to use E' center for evaluating the effective temperature at which the samples heated to by the contact with volcanic materials (Figure 3).…”

“…ESR spectra of non irradiated samples: a) sand dune showing OHC and E' centers; b) pumice in which no center is observed. P= 2mW; modulation = 1.25 G, cavity temperature = 300°K (modified fromFalguères et al, 1994).…”

Application of long time artificial optical bleaching of the E₁’ centre to sediment ESR dating

“…Thus, the bleaching characteristics of the signal intensity of E 1 ' centre (g = 2.0005) showing an obvious increase of ESR intensities within 120 h light exposure, then a slow increase between 120 and 400 h and bleaching curves showing a tendency towards saturation after 400 h, makes it controversial for ESR dating (Zhao et al, 1991;Jin et al, 1991). Falgueres et al (1994) studying the thermal annealing and dose response of the E 1 ' signals in a varie-ty of rocks and heating sediments showed that while the E 1 ' centre is absent in the natural sample and does not appear in the irradiated sample when the initial heating was higher than 550°C. The E 1 ' centre appears after irradiation when the initial heating is between 400 and 550°C.…”