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| Titel |
Paleoclimate record from Zidită Cave (Romania) using guano-derived δ¹³C isotopic data |
| VerfasserIn |
Ferenc L. Forray, Alexandra Giurgiu, Bogdan P. Onac, Tudor Tămaş |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250098622
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| Publikation (Nr.) |
 EGU/EGU2014-14313.pdf |
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| Zusammenfassung |
| In this study, we measured the carbon isotopic composition of a core taken from
a bat guano deposit in ZiditÄă Cave (Metaliferi Mountains, Romania). The cave
develops in Late Jurassic limestones, has a total length of 547 m, and its entrance was
fortified during the XIV – XVIII centuries. The cave is a fossil maze with a filling
represented by limestone blocks, clay sediments, and scarce calcite speleothems.
The guano accumulation, 1.5 m thick, is located in a small room towards the end
of the cave, under a Rhinolophus euryale roost site.The core was recovered with
a Russian peat corer. 14C dating performed on the guano indicates a continuous
deposition since ca. 500 years BP, but however, the upper first meter of the core has a
modern age and high radiocarbon activity acquired from atmospheric radiocarbon
bomb pulse. The core was sampled at 2 cm ± 2 mm intervals for δ13C analyses (76
samples) and at 5 cm for pollen. The investigations were carried out using a Picarro
G2121-i δ13C analyzer (Combustion Module coupled with a Cavity Ring Down
Spectroscopy technique) at the Stable Isotope Laboratory of the Department of
Geology, Babeş-Bolyai University (Cluj-Napoca, Romania). The result shows that
guano δ13C range from -24.07 to -27.61 oṪhe carbon isotopic profile indicates
two major wet periods and 2 to 3 shorter periods characterized by drier climate. |
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