10.6084/m9.figshare.3454442.v1
David J. Large
David J.
Large
A 1.16 Ma record of carbon accumulation in western European peatland during the Oligocene from the Ballymoney lignite, Northern
Ireland
Geological Society of London
2016
20 ka precession cycles
Cenozoic peatland carbon accumulation rates
Oligocene
CO
Ballymoney
δ 13 C
δ 13 C record
100 ka eccentricity
exogenic carbon reservoir
carbon accumulation rate
Northern Ireland
1.16 Ma record
Geology
2016-06-21 12:07:19
Journal contribution
https://geolsoc.figshare.com/articles/journal_contribution/A_1_16_Ma_record_of_carbon_accumulation_in_western_European_peatland_during_the_Oligocene_from_the_Ballymoney_lignite_Northern___Ireland/3454442
<p>The Oligocene Ballymoney lignite in Northern Ireland is one of the thickest lignites in Europe and provides the potential
for comparing Holocene and pre-Holocene peatland evolution and its response to long-term climate change on time scales much
greater than 10 ka. Samples were collected from 50 m of lignite and analysed for δ<sup>13</sup>C. Spectral analysis of the δ<sup>13</sup>C record reveals that the record contains significant frequencies at 0.21 m<sup>−1</sup> and 1.12 m<sup>−1</sup>. These cycles are interpreted as the <em>c</em>. 100 ka eccentricity and 20 ka precession cycles, respectively. These cycles were then tuned and the duration was determined
as 1.16 Ma with a carbon accumulation rate of 27 g C m<sup>−2</sup> a<sup>−1</sup>. If long-term changes in lignite δ<sup>13</sup>C are related to changes in the δ<sup>13</sup>C of the exogenic carbon reservoir, and if the lignite Chattian age is accepted, then the lignite probably formed between
24.6 and 25.8 Ma. Comparison of the estimated carbon accumulation rate with other Cenozoic peatland carbon accumulation rates
indicates that this rate appears to be insensitive to changes in the concentration of atmospheric CO<sub>2</sub>.
</p>