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How reliable is µXRF core scanning at detecting tephra layers in sedimentary records? A case study using the Lake Suigetsu archive (central Japan)

Urheber*innen

McLean,  Danielle
External Organizations;

Albert,  Paul G.
External Organizations;

/persons/resource/gosch

Schlolaut,  Gordon
4.3 Climate Dynamics and Landscape Evolution, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Lamb,  Henry F.
External Organizations;

Marshall,  Michael H.
External Organizations;

/persons/resource/brau

Brauer,  A.
4.3 Climate Dynamics and Landscape Evolution, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Wade,  Jon
External Organizations;

Nakagawa,  Takeshi
External Organizations;

Smith,  Victoria C.
External Organizations;

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5011311.pdf
(Verlagsversion), 7MB

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Zitation

McLean, D., Albert, P. G., Schlolaut, G., Lamb, H. F., Marshall, M. H., Brauer, A., Wade, J., Nakagawa, T., Smith, V. C. (2022): How reliable is µXRF core scanning at detecting tephra layers in sedimentary records? A case study using the Lake Suigetsu archive (central Japan). - Journal of Quaternary Science, 37, 7, 1189-1206.
https://doi.org/10.1002/jqs.3432


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5011311
Zusammenfassung
Here, we evaluate the ability of micro X-ray fluorescence (µXRF) core scanning to identify non-visible volcanic ash (cryptotephra) layers in sedimentary records. Its suitability is assessed using the annually resolved lacustrine sediments of Lake Suigetsu (Japan) for which there is high-resolution ITRAX µXRF core scanning data, and a detailed crypto-tephrostratigraphy (formerly established via density separation techniques). The studied core sections contain 10 visible and 30 cryptotephra markers that span a range of glass concentrations (from 1000 to >20 000 shards per gram of dried sediment) and compositions (basalts, trachy-andesites, phonolites, trachytes and rhyolites), thus providing an ideal case study. The ITRAX core scanner produced recognisable µXRF elemental responses for the visible ash layers, including those just 1 mm thick. However, just 10% of the cryptotephra layers could be unequivocally identified. Although this study demonstrates that µXRF core scanning should not be used as an independent method within a similar geological setting, we show it can provide a powerful tool alongside traditional techniques. Where detected, µXRF profiles can verify and refine cryptotephra positions (here to a sub-millimetre resolution), and help establish reworking signatures. These insights create possibilities for ultra-precise synchronisation of records, improved chronological modelling and help generate more complete eruption histories.