Quantification of termite bioturbation in a savannah ecosystem: Application of OSL dating

Jeppe Ågård Kristensen, Kristina Jørkov Thomsen, Andrew Murray, Jan-Pieter Buylaert, Mayank Jain, Henrik Breuning-Madsen

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    Abstract

    Luminescence dating is one of the most promising technique available for studying bioturbation on pedological timescales. In this study, we use multi-grain and single-grain quartz OSL to quantify termite bioturbation processes (Macrotermes natalensis) in a savannah ecosystem in Ghana. Termites transport soil from depth to the surface to construct termitaria. Over time, erosion levels these mounds and returns the sediment to the soil surface. These two processes of construction and erosion together represent an upward “conveyor belt” sediment transport process. We find that the sediment is effectively bleached during the erosion process allowing us to quantify retrospectively, for the first time, the surface deposition rate, the inverse of the upwards transport rate. At this site, this is ~0.28 mm year-1 and began about 4.000 years ago. Downward mixing through subsurface galleries may replace 10e20% of the volume ka-1 below the unit formed by reburied termite deposits. © 2015 Elsevier B.V. All rights reserved.
    Original languageEnglish
    JournalQuaternary Geochronology
    Volume30
    Issue numberPart B
    Pages (from-to)334–341
    Number of pages8
    ISSN1871-1014
    DOIs
    Publication statusPublished - 2015

    Keywords

    • Bioturbation
    • Macrotermes natalensis
    • Soil formation
    • Luminescence dating

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