Comparison of radiocarbon ages from different organic fractions in tropical peat cores: insights from Kalimantan, Indonesia
Wust, Raphael A.J., Jacobsen, Geraldine E., van der Gaast, Haitse, and Smith, Andrew M. (2008) Comparison of radiocarbon ages from different organic fractions in tropical peat cores: insights from Kalimantan, Indonesia. Radiocarbon, 50 (3). pp. 359-372.
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Various organic fractions of an Indonesian tropical peat deposit were dated using radiocarbon accelerator mass spectrometry (AMS). Four different depth layers, deposited during the last 28,000 14C yr, were analyzed and the data compared to bulk sample analyses. The pollen extracts consistently produced the oldest dates. The bulk samples (<250 μm and <100 μm) often yielded the youngest dates. The age difference between the individual fractions depended on the layer depth and hence the true age of the sampled peats. The age discrepancy was highest (~16,000 14C yr) in the oldest peat material. We interpret this to be a consequence of the input of organic matter over a long period of time, with peat oxidation and/or no peat accumulation during the last glacial maximum (LGM). The age discrepancies were smaller (between 10 and 900 14C yr) for the Holocene peat samples. It was concluded that the pollen extract fraction might be the most reliable fraction for dating tropical peat deposits that are covered by deeply rooting vegetation.
|Item Type:||Article (Refereed Research - C1)|
|FoR Codes:||04 EARTH SCIENCES > 0403 Geology > 040303 Geochronology @ 100%|
|SEO Codes:||97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 100%|
|Deposited On:||22 Mar 2010 12:01|
|Last Modified:||25 May 2013 01:03|
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