Constraining the chronology of Quaternary fluvial sediments in the Pannonian Basin.

TY - GEN

T1 - Constraining the chronology of Quaternary fluvial sediments in the Pannonian Basin.

AU - Nelson, Ellie

AU - White, Dustin Scott

AU - Penkman, Kirsty Elizabeth Helena

PY - 2024/7/18

Y1 - 2024/7/18

N2 - The correlation of terrestrial deposits with the marine oxygen isotope record is often challenging due to the lack of continuous stratigraphic sequences and material for radiometric dating. The Great Hungarian Plain contains large basins with a thick alluvial succession, almost 500 m in depth, providing a long-term record of Quaternary terrestrial deposits. Five fully cored boreholes have been collected from the Körös and Jászság basins and Makó Trough. Two paleomagnetically-dated boreholes from the Körös Basin were correlated with the other three boreholes by the magnetic susceptibility of the sediments and the first and last appearance of the freshwater gastropod Viviparus boeckhi. The cyclic nature of the magnetic susceptibility throughout the stratigraphy, in relation with the early postglacial degradation of mountain permafrost, provides a mechanism for correlation between the boreholes. This also enables correlation to the marine oxygen isotope record. The chronology established by this approach was tested using amino acid geochronology. Calcitic opercula from bithyniid freshwater snails were analysed using the intra-crystalline protein decomposition (IcPD) approach to build a relative chronology across the five boreholes. The operculum specimens were obtained from the Krolopp Malacological Collection. This was the first time that IcPD analysis of opercula was used to develop a time signal for cores of depths greater than 65 m; despite concerns that the degradation reactions might be impacted by the geothermal gradient, results from the IcPD analysis support the chronology developed using magnetic susceptibility stratigraphy. This demonstrates the potential for the use of amino acid geochronology for correlating deep cores throughout the entire Quaternary period.

AB - The correlation of terrestrial deposits with the marine oxygen isotope record is often challenging due to the lack of continuous stratigraphic sequences and material for radiometric dating. The Great Hungarian Plain contains large basins with a thick alluvial succession, almost 500 m in depth, providing a long-term record of Quaternary terrestrial deposits. Five fully cored boreholes have been collected from the Körös and Jászság basins and Makó Trough. Two paleomagnetically-dated boreholes from the Körös Basin were correlated with the other three boreholes by the magnetic susceptibility of the sediments and the first and last appearance of the freshwater gastropod Viviparus boeckhi. The cyclic nature of the magnetic susceptibility throughout the stratigraphy, in relation with the early postglacial degradation of mountain permafrost, provides a mechanism for correlation between the boreholes. This also enables correlation to the marine oxygen isotope record. The chronology established by this approach was tested using amino acid geochronology. Calcitic opercula from bithyniid freshwater snails were analysed using the intra-crystalline protein decomposition (IcPD) approach to build a relative chronology across the five boreholes. The operculum specimens were obtained from the Krolopp Malacological Collection. This was the first time that IcPD analysis of opercula was used to develop a time signal for cores of depths greater than 65 m; despite concerns that the degradation reactions might be impacted by the geothermal gradient, results from the IcPD analysis support the chronology developed using magnetic susceptibility stratigraphy. This demonstrates the potential for the use of amino acid geochronology for correlating deep cores throughout the entire Quaternary period.

U2 - 10.5281/zenodo.12749221

DO - 10.5281/zenodo.12749221

M3 - Conference contribution

SP - 1610

BT - XXI Congress of the International union for Quaternary Research ”Time for Change”

PB - University of Sapienza

CY - Rome

T2 - INQUA Congress

Y2 - 13 July 2023

ER -