Continuous color model as a tool to improve speleothem age model development

Authors

Celia Campa-Bousoño, University of Oviedo, SpainFollow
Ángel García-Pérez, University of Oviedo, SpainFollow
Ana Moreno, Pyrenean Institute of Ecology, SpainFollow
Miguel Iglesias, University of Oviedo, SpainFollow
Hai Cheng, Institute of Global Environmental Change, ChinaFollow
R Lawrence Edwards, University of Minnesota, USAFollow
Heather Stoll, ETH Zürich, SwitzerlandFollow

Highlights

• Relationship between color and growth rate is described by an exponential function
• Color growth rate model is useful in guiding optimal locations for U-Th dating
• Color growth rate model may enable a better age model to be built with fewer dates
• Stalagmite color does not show consistent relationships with climate indicators

Abstract

Because they can archive a variety of geochemical proxies and be precisely and accurately dated with the U-Th decay series chronometer, stalagmites are widely used for paleoclimate reconstructions. However, limitations in the use of this chronometer arise because U-Th dating is analytically time consuming, expensive, and requires a relatively large sample size. These limitations restrict the number of absolute dates usually obtained, which can result in significant uncertainties in the age model and inhibit the ability to archive high resolution records of environmental variability, particularly in those stalagmites where there are variations in growth rate not constrained by U-Th dates. Here, we explore the relationship between stalagmite color and growth rate. Consequently, we evaluate the use of a simple, practically non-destructive approach to model the age-depth relationship of stalagmites using the sample color to provide a continuous record of growth rate. The method was developed by comparing high-resolution color images with pre-determined U-Th dates along the growth axes of seven stalagmites. The obtained results suggest that prior to dating, a color-derived, continuous growth rate model may be used to identify important changes in growth rate which may aid in the determination of the most efficacious locations for U-Th dating. Further, continuous color-derived interpolations between U-Th derived dates may be superior to traditional linear interpolation methods. Such an approach has the potential to greatly improve a researcher’s ability to efficiently choose sampling locations for more precise, albeit laborious and costly, U-Th dating.

DOI

https://doi.org/10.5038/1827-806X.50.3.2389

Creative Commons License

This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 4.0 License.

Recommended Citation

Campa-Bousoño, C., García-Pérez, Á., Moreno, A., Cheng, H., Edwards, R.L., Stoll, H., 2021. Continuous color model as tool to improve speleothem age model development. International Journal of Speleology, 50(3), 313-326. https://doi.org/10.5038/1827-806X.50.3.2389