Combined fluorescence imaging and LA-ICP-MS trace element mapping of stalagmites: Microfabric identification and interpretation

Open access
Date
2021-10-20Type
- Journal Article
Abstract
Here, we map a series of stalagmites from Asturias, Spain, by laser ablation inductively-coupled-plasma mass spectrometry and confocal laser scanning (fluorescence) microscopy and discuss the origins of trace element and fluorescence variations. Seasonal banding is evident with both methods and may be attributed to lignins/humic acids based on fluorescence absorption and emission characteristics. Some lateral variations in fluorescence present as saw-tooth fluorescent “spires” and demonstrate disruptions of seasonal banding, corroborated by trace element variations (most prominently Mg and Na). Such features likely reflect the differential partitioning of trace elements by sectoral zoning as a result of low supersaturation and/or high organic matter load, combined with the effects of dissolved organic matter on the calcite growth surface and the association of each element with colloidal organic matter. The lateral variability of trace elements demonstrates the pitfalls of obtaining trace element information from one-dimensional transects without prior reconnaissance mapping. It is, however, possible that traditional drilling with ~1 mm holes homogenizes these features and provides reliable trace element estimates. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000491078Publication status
publishedExternal links
Journal / series
Chemical GeologyVolume
Pages / Article No.
Publisher
ElsevierSubject
Speleothem; LA-ICP-MS; Confocal laser scanning microscopy; Trace elements; FluorescenceOrganisational unit
09601 - Stoll, Heather / Stoll, Heather
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