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| Titel |
Radiocarbon dating of Sphagnum cellulose from Mohos peat bog, East Carpathians |
| VerfasserIn |
Katalin Hubay, Mihály Braun, Sándor Harangi, László Palcsu, Marianna Túri, László Rinyu, Mihály Molnár |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250110776
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| Publikation (Nr.) |
 EGU/EGU2015-10813.pdf |
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| Zusammenfassung |
| This work focuses on building a high-resolution age-depth model for quantitative
paleoclimate study from the Mohos peat bog, East Carpathians. Peats are important archives
for Quaternary science, because they preserve environmental changes. To study the
chronology of peat profiles the key is in the precise coring and reliable dating. However,
many studies dealing with coring and radiocarbon dating of peat deposits they often shown
problems with the proper methods and material.
With our novel coring technique we reached undisturbed and uncompressed peat cores
from the Mohos bog. A 10 meter deep peat profile was drilled in 2012 using a modified
technique of a piston corer. The core presents a continuous peat profile from the last 11.500
cal. yr BP.
The chronology was based on AMS radiocarbon analyses of the separated Sphagnum
samples from different depths of the profile. The peat samples were wet sieved (40-280 μm)
to avoid contamination by rootlets. Dry Sphagnum samples for AMS dating were prepared
using the classical acid-base-acid (ABA) method completed with an oxidative bleaching step
to get clean cellulose. Sphagnum cellulose samples were converted to CO2 and later graphite
and measured by EnvironMICADAS accelerator mass spectrometry (AMS) in Hertelendi
Laboratory (Debrecen, Hungary).
Fine peat accumulation rate changes (sections with lowest accumulation values) were
observed along the profile. Based on the chronology in further studies we want to focus
special intervals to investigate environmental changes in the Holocene.
Key words: peat, radiocarbon, cellulose |
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