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Kvartsmineralogins betydelse för en lyckad luminiscensdatering

Author

  • Karin Walheim

Summary, in English

Optically stimulated luminescence analysis (OSL analysis) is a method used to date sediments from late Quaternary. The method is useful to find out when geological events took place and when the ice sheets moved during the recent glaciation and deglaciation. A mineral that can be used for determination of age with OSL is quartz. The OSL dating method does not determine the age of the individual quartz grain, but rather the settling age of the sediment in which the quartz is included. However, the quality of the OSL results are not always satisfactory, which depends on the quartz sensitivity. Quartz with high sensitivity is better at releasing luminescence energy with a dominant fast signal component, which is necessary for successful OSL dating.
This report examines whether the quartz sensitivity depends on trace elements found in the quartz crystals’ grid. Quartz from samples previously analysed by OSL were analysed by LA-ICP-MS to obtain its quantitative chemical composition. The results from the previously conducted OSL analysis were compared with the results of the LA-ICP-MS analysis. No clear association between trace elements and quartz sensitivity could be observed.

Publishing year

2017

Language

Swedish

Publication/Series

Examensarbeten i geologi vid Lunds universitet

Document type

Student publication for Bachelor's degree

Topic

  • Earth and Environmental Sciences

Keywords

  • kvartsmineralogi
  • LA-ICP-MS
  • luminiscens
  • optiskt stimulerad luminescens (OSL)
  • åldersdatering

Report number

514

Supervisor

  • Helena Alexanderson (professor)
  • Tomas Naeraa
  • Anders Scherstén (Dr.)