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Holocene and Late Pleistocene climate in the sub-Mediterranean continental environment: A speleothem record from Poleva Cave (Southern Carpathians, Romania)

Domenii publicaţii > Ştiinţele pământului şi planetare + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Constantin, S., Bojar, A.-V., Lauritzen, S.-E., Lundberg, J.

Editorial: Elsevier, Palaeogeography, Palaeoclimatology, Palaeoecology, 243/3-4, p.322-338, 2006.

Rezumat:

The PP10 stalagmite from Poleva Cave provides a Late Pleistocene and Holocene isotopic record characteristic for the SW of Romania, a sub-Mediterranean climatic region. The speleothem was dated by eight TIMS and one alpha U-series dates which
showed that it was precipitated between ~75 ka and ~2 ka with at least two hiatuses. The basal sector of the stalagmite showed a slow-growing regime of ~0.26 cm/ka, while the upper one grew relatively fast with about 5 cm/ka. The temporal resolution for the
isotopic sampling is thus ~2 ka/sample for the lower sector, and ~150 years/sample for the upper one. The relationship between d18O and temperature was found positive. The isotopic record of the lower sector shows two marked cold intervals during ~67 and 58 ka and ~40–35 ka, respectively, which correlate well with the Villars and Soreq records. The upper sector record is so far the
most detailed Holocene isotopic record in Romania and the only one available for the regions located at the exterior of the Carpathians Range. The signal shows a gradual warming after the GS1 event punctuated by several cold events at ~8, 7.2 and 4.2 ka and also by warm oscillations centered at about 5.2 and 3.3 ka. The results seem to indicate that if the North-Atlantic firstorder
signals may extend well to the south-eastern Europe, their amplitude and general trend may be diminished by the
interferences with the Mediterranean circulation.

Cuvinte cheie: speleoteme, datari cu seria uraniului, izotopi stabili, Holocen, Pleistocen superior, paleoclimat, Romania // speleothems, U-series datings, isotopes, Holocene, Late Pleistocene, paleoclimate, Romania

URL: doi:10.1016/j.palaeo.2006.08.001.