POTENTIAL USE OF THE E' CENTER AS AN INDICATOR OF INITIAL RESETTING IN TL ESR DATING OF VOLCANIC MATERIALS/

Quartz inclusions embedded in volcanic materials can be used for datin g Quaternary volcanoes by TL or ESR methods. For these techniques the initial zeroing by heat is assumed. However, this assumption can somet imes be questioned either because the temperature was not high, like i n phreatomagmatic deposits, or because of contamination, Like in thin tephra layers. Preliminary observations suggested that the presence of the E' center could be an indicator of poor initial zeroing. This pos sibility was investigated in the present work. Quartz grains from vari ous geological contexts were studied for comparison. Annealing and reg eneration of the E' center was explored.