Cyclicity in the Fuentillejo maar-lake sedimentary record: climatic history of the last 47000 years cal BP
DOI:
https://doi.org/10.21701/bolgeomin.124.2.006Keywords:
cyclostratigraphy, geochemistry, maar-lake, QuaternaryAbstract
We have analysed the geochemical (element analysis), mineralogical and sedimentary facies to characterize the sedimentary record in Fuentillejo maar-lake in the central Spanish volcanic field of Campo de Calatrava and thus be able to reconstruct the cyclicity of the sedimentary and paleoclimatic processes involved. The upper 20 m of core FUENT-1 show variations in clastic input and water chemistry in the lake throughout the late Pleistocene and Holocene. The temporal framework provided by 14C accelerator mass spectrometry (AMS) dating indicates that the sequence covers the last 47 ka cal BP. Normalized geochemical TiO2 and CaO records were used to carry out a spectral analysis that revealed the millennial cyclicity present in the sequence. with major periodicities of 15.1 ky, 10 ky, 5.4 ky, 3.4 ky, 2.3 ky, 1.8 ky, 1.5 ky, 910, 863 and 606 years. All these peaks also appear in the power spectrum of the Vostok record (110 ky, 8.2 ky, 4.9 ky, 3.4 ky, 2.1 ky, 1.9 ky and 1.1 ky) and NGRIP record (3.3 ky, 1.6 ky and 952 years), which have been analysed using the same method as for the FUENT-1 series and the same time-window. These cycles correspond closely with the harmonics of Milankovitch´s climatic precession cycle of 1 / fp =23 ka. Only the time period between 12 and 47 ka (MIS 2 and 3) was analysed, giving cycles of 8.6 ka, 4.9 ky and 3.2 ka, which exceed a confidence level of 95%. The 1.5 ka cycle is also quite significant, especially in the CaO series, indicating warm, arid events in the Fuentillejo sequence, which modulated its water balance and may be related to the cyclicity of the Dansgaard-Oeschger (DO) events.
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