Proposing new approaches for dating young volcanic eruptions by luminescence methods |
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Authors: | Daniel Rufer Edwin Gnos Ralph Mettier Frank Preusser Guido Schreurs |
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Institution: | 1.Institute of Geological Sciences,University of Bern,Bern,Switzerland;2.Muséum d’histoire naturelle de Genève,Genève,Switzerland;3.Department of Physical Geography and Quaternary Geology,Stockholm University,Stockholm,Sweden |
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Abstract: | The application of luminescence dating to young volcanic sediments has been first investigated over three decades ago, but
it was only with the technical innovations of the last decade that such analyses became viable. While current analytical procedures
show promise for dating late Quaternary volcanic events, most efforts have been aimed at unconsolidated volcanic tephra. Investigations
into direct dating of lava flows or of non-heated volcanoclastics like phreatic explosion layers, however, remain scarce.
These volcanic deposits are of common occurrence and represent important chrono- and volcanostratigraphic markers. Their age
determination is therefore of great importance in volcanologic, tectonic, geomorphological and climate studies. In this article,
we propose the use of phreatic explosion deposits and xenolithic inclusions in lava flows as target materials for luminescence
dating applications. The main focus is on the crucial criterion whether it is probable that such materials experience complete
luminescence signal resetting during the volcanic event to be dated. This is argued based on the findings from existing literature,
model calculations and laboratory tests. |
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