Arid conditions around the 8.2 ka event recorded by stable isotopes of gypsum in Laguna de Medina (Cádiz)
DOI:
https://doi.org/10.55407/geogaceta95513Keywords:
gypsum, stable isotopes, 8.2 ka event, paleoclimate, lakesAbstract
The southern Iberian Peninsula has been especially sensitive to climate changes during the Holocene, which were recorded by the sedimentary sequences in the numerous lakes of the Guadalquivir Basin. In this study, we investigate the oxygen and hydrogen isotopes (δ18O, δ2H and d-excess) of gypsum (CaSO4·2H2O) hydration water from the sedimentary sequence of Laguna de Medina (Cádiz) to reconstruct the isotopic composition of the lake water in the past, in connection to climate changes. We focus on sediments retrieved from 24 to 18 m deep, which ages range from ~9.0 to ~7.0 cal. ky BP. The sediments of the lake recorded an intense aridity episode around ~7.7 cal. ky BP, evidenced by the presence of gypsum. The elevated δ18O and δ2H values of the paleo-lake water (up to 7.4‰ and 26.1‰, respectively) indicate that the solution from which gypsum formed was highly evaporated. Such arid conditions could be attributed to the 8.2 ka event, a global cold climatic episode. Research in progress aims to quantify climatic parameters (humidity and temperature) during the 8.2 ka event from the Laguna de Medina sedimentary sequence and to improve the chronology of this episode.
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