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Flowstones from the Račiška Pečina Cave (SW Slovenia) Record 3.2-Ma-Long History Cover

Flowstones from the Račiška Pečina Cave (SW Slovenia) Record 3.2-Ma-Long History

Geochronometria
Volume 48 (2021): Issue 1 (January 2021)
By: P. Sierpień,  J. Pawlak,  H. Hercman,  P. Pruner,  N. Zupan Hajna,  A. Mihevc and  P. Bosák  
Open Access
|Apr 2021

Figures & Tables

Fig 1

(A) Location of the study site in Slovenia; (B) cave map and profile location (marked with a red circle) (modified from Zupan Hajna et al., 2008); (C) studied profile scheme: grey shading — flowstones; brown shading — clays; diagonal shading (light blue) — collapsed limestone blocks; yellow crosshatching — younger speleothem cover; red line — principal disconformity; F1 — faunal position; USp — position of Ursus speleus sp (cave bear) bone fragments; RP — sampling profile for C and O isotope analyses; and (D) magnetostratigraphic log according Pruner et al., (2009) correlated with the GPTS (Cande and Kent, 1995); black — normal polarity, white — reverse polarity, grey — transitional polarity, wavy line — disconformity. GPTS, Geomagnetic polarity time scale.

Fig 2

Stable oxygen (A) and carbon (B) isotope compositions in the RP profile. Vertical red lines — principal disconformity; vertical, dotted, and brown lines — main clay layers.

Fig 3

Comparison of similarity indicators in the Medi and LR04 records to the RP oxygen isotope composition (calculation in Gen-Corr by Pawlak and Hercman, 2016); (A) boxplots for the upper part of the RP profile and (B) boxplots for the lower part of the RP profile; the vertical axis represents the 2s uncertainty of the similarity indicator.

Fig 4

Correlation results of the RP oxygen isotope record with the LR04 and Medi records. All data presented were normalised and the marine d18O data were inverted. (A) RP curve (blue line) for the upper segment of the profile correlated with the LR04 curve (black line); (B) RP curve (blue line) for the lower segment of the profile correlated with the Medi curve (black line); (C) age-depth model for the upper segment of the profile; and (D) age-depth model for the lower segment of the profile; red lines — confidence intervals; grey boxes — hiatuses; red boxes —principal disconformity.

Fig 5

The final set of stable carbon and oxygen isotope records of the RP profile; (A) MIS scale (warm — red; cold — blue) (Lisiecki and Raymo, 2005); (B) stable oxygen isotope record (smoothed data — blue; raw data — grey); and (C) stable carbon isotope record (smoothed data — black; raw data — grey); grey boxes — hiatuses; red box — principal disconformity; green boxes — episodes where the R2 value is significantly greater, R2 = 0.4538, R2 = 0.4944, and R2 = 0.6065. MIS, Marine isotope stage.

Fig 6

Correlation of d13C and d18O values from the entire RP profile (p < 0.05).

Detailed data of benchmarks used for OIS_

No.Age (Ma)Age uncertaintyDepth in RP profile (mm)Depth uncertainty (mm)δ18O [‰]δ13C [‰]Type of benchmark
10.120.02652.5−4.90−6.84U-series age
20.4950.0152102.5−5.32−9.20Age at model*
30.780.01172802.5−5.45−9.22Paleomagnetic
40.800.022952.5−5.39−9.72Age at model*
52.580.03871572.52.5––Paleomagnetic
63.20.04818602.5−5.28−7.75Paleomagnetic

Results of U-series dating of the RP profile_

Lab. no.SampleU cont. (ppm)234U/238U AR230Th/234U AR230Th/232Th ARAge (ka)*Corrected age (ka)
1537RP 10.1236 ± 0.00611.117 ± 0.0670.698 ± 0.04514 ± 3 126−13+14 126_{ - 13}^{ + 14} 120 ± 20
1538RP660.1239 ± 0.00491.239 ± 0.0591.068 ± 0.0511.184 ± 0.052>450 (440−130+inf) \left( {440_{ - 130}^{ + \inf }} \right)
DOI: https://doi.org/10.2478/geochr-2021-0004 | Journal eISSN: 1897-1695
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Language: English
Page range: 31 - 45
Submitted on: Oct 7, 2019
|
Accepted on: Feb 12, 2021
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Published on: Apr 14, 2021
Published by: Sciendo
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year
Keywords:
stable isotopes,
paleoclimate,
OIS method,
paleomagnetic data,
Dinarides
Related subjects:
Geosciences,
Geosciences, other

© 2021 P. Sierpień, J. Pawlak, H. Hercman, P. Pruner, N. Zupan Hajna, A. Mihevc, P. Bosák, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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