Journal
QUATERNARY GEOCHRONOLOGY
Volume 54, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.quageo.2019.101006
Keywords
Bayesian age model; Radiocarbon; OSL; IRSL; Last glacial cycle; Mediterranean; Continental sequences
Funding
- DINAMO project by the Spanish Inter-Ministry Commission of Science and Technology (CICYT) [CGL-BOS 2009-07992]
- DINAMO2 project by the Spanish Inter-Ministry Commission of Science and Technology (CICYT) [CGL-BOS 2012-33063]
- DINAMO 3 project by the Spanish Inter-Ministry Commission of Science and Technology (CICYT) [CGL2015-69160-R]
- IBERIANPALEOFLORA project by the Spanish Inter-Ministry Commission of Science and Technology (CICYT) [CGL-BOS 2012-31717]
- GRACCIE-CONSOLIDER project by the Spanish Inter-Ministry Commission of Science and Technology (CICYT) [CSD2007-00067]
- Aragon Government
- UK Natural Environment Research Council consortium RESET [NE/E015670/1]
- Australian Research Council (ARC) Future Fellowship [FT130100195]
- Australian Research Council (ARC) Discovery Early Career Researcher Award [DE160100743]
- IGNEX project - FRIMEDBIO program of The Research Council of Norway [249894]
- DFG [FOR 2358]
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We present a multidisciplinary dating approach - including radiocarbon, Uranium/Thorium series (U/Th), paleomagnetism, single-grain optically stimulated luminescence (OSL), polymineral fine-grain infrared stimulated luminescence (IRSL) and tephrochronology - used for the development of an age model for the Canizar de Villarquemado sequence (VIL) for the last ca. 135 ka. We describe the protocols used for each technique and discuss the positive and negative results, as well as their implications for interpreting the VIL sequence and for dating similar terrestrial records. In spite of the negative results of some techniques, particularly due to the absence of adequate sample material or insufficient analytical precision, the multi-technique strategy employed here is essential to maximize the chances of obtaining robust age models in terrestrial sequences. The final Bayesian age model for VIL sequence includes 16 AMS C-14 ages, 9 single-grain quartz OSL ages and 5 previously published polymineral fine-grain IRSL ages, and the accuracy and resolution of the model are improved by incorporating information related to changes in accumulation rate, as revealed by detailed sedimentological analyses. The main paleohydrological and vegetation changes in the sequence are coherent with global Marine Isotope Stage (MIS) 6 to 1 transitions since the penultimate Termination, although some regional idiosyncrasies are evident, such as higher moisture variability than expected, an abrupt inception of the last glacial cycle and a resilient response of vegetation in Mediterranean continental Iberia in both Terminations.
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