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A Process- and Provenance-Based Attempt to Unravel Inconsistent Radiocarbon Chronologies in Lake Sediments: An Example from Lake Heihai, North Tibetan Plateau (China)

Published online by Cambridge University Press:  23 February 2016

Gregori Lockot ,
Arne Ramisch ,
Bernd Wünnemann ,
Kai Hartmann ,
Torsten Haberzettl ,
Hao Chen  and
Bernhard Diekmann
Gregori Lockot*
Affiliation:
Institute of Geographical Science, Freie Universität Berlin, Berlin, Germany
Arne Ramisch
Affiliation:
Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam, Germany
Bernd Wünnemann
Affiliation:
Institute of Geographical Science, Freie Universität Berlin, Berlin, Germany Nanjing Integrated Centre for Earth System Science, Nanjing University, Nanjing, China
Kai Hartmann
Affiliation:
Institute of Geographical Science, Freie Universität Berlin, Berlin, Germany
Torsten Haberzettl
Affiliation:
Institute of Geography, Friedrich-Schiller-University Jena, Jena, Germany
Hao Chen
Affiliation:
Nanjing Integrated Centre for Earth System Science, Nanjing University, Nanjing, China
Bernhard Diekmann
Affiliation:
Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam, Germany
*
2.Corresponding author. Email: g.lockot@fu-berlin.de.
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Abstract

Aquatic macrophytes from a lacustrine environment are highly prone to a reservoir effect, resulting in an overestimation of age. This is often caused by the incorporation of dissolved carbon (CO2 and HCO3–) through photosynthesis from lake waters that have a different 14C activity than the atmosphere. The atmosphere-water disparity is often produced by a mixing of carbon between the water body and its terrestrial surroundings, a process highly prone to temporal variations. Thus, only a comprehensive understanding of the 14C budget over time enables a reliable chronology of lacustrine records. We studied lacustrine sediments from Lake Heihai on the northern Tibetan Plateau with a recent reservoir effect of 6465 ± 75 14C yr as estimated from accelerator mass spectrometry (AMS) dating of three living aquatic plants. Age inversions in a well-laminated composite core from the lake suggest that the reservoir effect markedly changed over the depositional period. In the lower part of the core, an excellent correlation was observed between the allochthonous input of dolomite and the inverse 14C ages, indicating the incorporation of dissolved 14C-dead carbon from a limestone catchment in the plant material. For the upper part of the core, sediment recycling of Holocene high-stand deposits may have further contributed to the reservoir effect. These findings give rise to a reliable process- and provenance-based chronology within a confidence interval supported by 137Cs measurements and magnetostratigraphic investigations. Our results highlight the need to identify the interactions of lakes with their surroundings to estimate reservoir-corrected ages in lacustrine settings.

Type
Articles
Information
Radiocarbon , Volume 57 , Issue 5 , 2015 , pp. 1003 - 1019
Copyright
Copyright © 2015 The Arizona Board of Regents on behalf of the University of Arizona 

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