Lateglacial-Middle Holocene stable isotope records in two coeval stalagmites from the Bihor Mountains, NW Romania

• Autorzy: Tamaş T. , Onac B. P. , Bojar A. V.
• Konferencja: Stable isotope records of environmental change. European Society for Isotope Research. VII Isotope Workshop, Graz 2004
• Języki publikacji: EN

Abstrakty

EN

Oxygen and carbon stable isotope records of two stalagmites from NW Romania provide a continuous climatic record between 14.8 and 5.6 ka BP. The chronology is established by 21 TIMS uranium series ages. Uncertain ties in the isotope chronology range between ±20 and ±100 yr. The δ¹⁸ O values are positively correlated with temperature, whereas δ¹³ C fluctuations suggest changes in soil CO₂ production. Lateglacial deposition of both stalagmites started at ~14.8 ka BP. The delta 18 O records subsequently show a slow decline in temperatures until 12.6 ka BP. Three warmer periods with increased soil productivity occurred at 14.5-13.9 ka BP, 13.6-13.2 ka BP, and 12.9-12.6 ka BP. Lower delta 18 O and high δ¹³ C values between 12.6 and 11.4 (11.7) ka BP in dicate a cold and dry climate during the Younger Dryas (GS-1). During the Early Holocene, three short cold intervals are marked on the δ ¹⁸ O profiles at 11.0-10.6, 10.5-10.2 and 9.4-9.1 ka BP. For the remainder of the Holocene sequence, the δ¹⁸ O records show less variation between 9 and 7.8 ka BP and gradual warming from 7.6-5.6 ka BP. The speleothem records correlate with the Green land ice core records and with other proxies through out Europe and the North Atlantic region.

Słowa kluczowe

EN

NW Romania; Late Glacial; Middle Holocene; stalagmites; stable isotopes; uranium-thorium TIMS dating

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2005
• Tom: Vol. 49, No. 2
• Strony: 185--194
• Opis fizyczny: Bibliogr. 53 poz., rys., tab., wykr.

Twórcy

autor

Tamaş T.

• Quaternary Research Group, “Babeș Bolyai” University, Kogălniceanu 1 and “Emil Racoviţă” Institute of Speleology, Clinicilor 5, 400006 Cluj-Napoca, Romania

autor

Onac B. P.

• Quaternary Research Group, “Babeº-Bolyai” University, Kogãlniceanu 1 and “Emil Racoviþã” Institute of Speleology, Clinicilor 5, 400006 Cluj-Napoca, Romania

autor

Bojar A. V.

• Institute of Earth Sciences, Karl-Franzens University, Heinrichstrasse 26, A-8010 Graz, Austria

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