Radiocarbon ages, planktonic foraminifera abundances and oxygen isotopes from 2 piston cores from the southwestern South Atlantic covering the last 40 ka

• Main Authors: Iwai, Fabiane Sayuri, Bianchi, Marcelo, Costa, Karen Badaraco, Toledo, Felipe Antonio de L
• Format: Dataset
• Language: English
• Published: PANGAEA 2018
• Subjects: Planktonic foraminifera
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.893116; https://doi.org/10.1594/PANGAEA.893116

Repeated automated runs of signal alignment were used both to obtain an average fit (age model) and confidence intervals (uncertainties) for two marine sediment records from the southwest South Atlantic. A global and regional δ18O stack (LR04 and SL14, respectively) were used to transfer ages to the two records employing calibrated radiocarbon ages as chronological control points using the automated Match algorithm. A similar correlation between the two records is found both when the two records are correlated using the age model obtained and using δ18O correlation, validating the age models obtained by repeated automated tuning. The use of Termination I and Biozone Y/Z as chronological control points for the last deglaciation on high-resolution records is discussed here. The availability of uncertainties allowed more accurate interpretations. It is possible to observe that Biozone Y/Z is diachronous even on regional scale. Meanwhile Termination I is approximately synchronous on the regional scale but it is diachronous on the global scale. Although the stratigraphic events considered in this investigation are not globally synchronous and therefore not ideal control points for age models of high-resolution records, timing stratigraphic events in different locations has great relevance for investigations on triggering and propagation of climatic events and detailed understanding of climatic change mechanisms.