2TDK Railway, profile P18. Datings. Final Report.

0569540 - GLÚ 2024 CZ eng V - Výzkumná zpráva
Bosák, Pavel - Zupan Hajna, N. - Hercman, H. - Horáček, I. - Kdýr, Šimon - Kogovšek, B.
2TDK Railway, profile P18. Datings. Final Report..
Praha: Institute of Geology, Czech Academy of Sciences, v. v. i.: Postojna: Karst Research Institute ZRC SAZU, 2023. 27 s.
Institucionální podpora: RVO:67985831
Klíčová slova: Divača Karst * unroofed cave * speleothem * U-Th dating * paleomagnetism * zoopaleontology
Obor OECD: Geology

Samples for datings were taken in the railway construction (2TDK) near village of Divača, Classical Karst on October 12, 2021: (1) vertebrate bones in cave 2TDK – 002 at the profile P18, cave entrance appeared during the construction operations on cleaned karst surface in a wall of karst depression. Samples of mammal bones and gastropods were collected in situ on cave bottom, and (2) pieces of speleothems occurring in non in situ position on artificially planated surface near the cave opening were collected. U-series: no numerical date was obtained as geochemistry of sample indicate open system, probably due to recrystallization of sample in soil cover. Paleomagnetism: The transition of N- and R-polarized samples cannot be identified more precisely as U-series radiometric dating yielded no numerical results. The transition easily can represent Brunhes/Matuyama boundary (at 773 ka) as well as any of older such transitions (e. g., base of Jaramillo, base of Olduvai). In any case the speleothem grew in a closed cave space with roof, probably as flowstone (inclusion of red soils above the base) and later as baldachin on eroded allogenic fill of the paleocave. Vertebrate paleontology: bone remains of small and larger vertebrates represent subrecent to Holocene species. Sorex alpinus represents the species quite rare in fossil record, but recetly limited to variegated woodland habitats with high surface humidity. A chamois Rupicapra rupicapra represents a resident species present in Slovenia throughout all stages of a glacial cycle, recently restricted to mountain habitats.
Trvalý link: https://hdl.handle.net/11104/0340900