Holocene floods in a complex fluvial wetland in central Spain: Environmental variability, climate and time

Santisteban, Juan I.; López, Rosa María Mediavilla; Frutos, Luis Galán de; López-Cilla, Ignacio

doi:10.1016/j.gloplacha.2019.102986

Cited by 8 publications

(8 citation statements)

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“…1), is characterized by having had less intense surface erosion during the late Quaternary due to a higher local base level of erosion. Here, the wetlands of the upper Guadiana River represent a valuable Late Pleistocene archive that is being intensively researched (e.g., Santisteban et al, 2019). The sedimentary record of the Fuentillejo maar lake in the volcanic field of Campo de Calatrava (Ortiz et al, 2013) shows evidence of environmental fluctuations corresponding to D-O cycles.…”

Section: Introductionmentioning

confidence: 99%

Evidence for strong relations between the upper Tagus loess formation (central Iberia) and the marine atmosphere off the Iberian margin during the last glacial period

et al. 2021

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During glacial times, the North Atlantic region was affected by serious climate changes corresponding to Dansgaard-Oeschger cycles that were linked to dramatic shifts in sea temperature and moisture transfer to the continents. However, considerable efforts are still needed to understand the effects of these shifts on terrestrial environments. In this context, the Iberian Peninsula is particularly interesting because of its close proximity to the North Atlantic, although the Iberian interior lacks paleoenvironmental information so far because suitable archives are rare. Here we provide an accurate impression of the last glacial environmental developments in central Iberia based on comprehensive investigations using the upper Tagus loess record. A multi-proxy approach revealed that phases of loess formation during Marine Isotope Stage (MIS) 2 (and upper MIS 3) were linked to utmost aridity, coldness, and highest wind strengths in line with the most intense Greenland stadials also including Heinrich Events 3–1. Lack of loess deposition during the global last glacial maximum (LGM) suggests milder conditions, which agrees with less-cold sea surface temperatures (SST) off the Iberian margin. Our results demonstrate that geomorphological system behavior in central Iberia is highly sensitive to North Atlantic SST fluctuations, thus enabling us to reconstruct a detailed hydrological model in relation to marine–atmospheric circulation patterns.

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Section: Introductionmentioning

confidence: 99%

Evidence for strong relations between the upper Tagus loess formation (central Iberia) and the marine atmosphere off the Iberian margin during the last glacial period

et al. 2021

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“…Ca/Si ratio points to the carbonated vs. siliciclastic sources [65,66], while Si/Al and Zr/Al are used as textural proxies like sorting or grain size [38,67] (Figure 4f). These ratios show no clear trends, as those mentioned before, but they can be divided in three stages: from 12 until 8.8 ka BP, their record show low amplitude cycles that shorten their period in time, Ca/Si decreases while Zr/Al and Si/Al remain, showing a slowly increasing trend; from that time until ca.…”

Section: Geochemistrymentioning

confidence: 99%

Environmental Changes and Cultural Transitions in SW Iberia during the Early-Mid Holocene

et al. 2021

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The SW coast of the Iberian Peninsula experiences a lack of palaeoenvironmental and archaeological data. With the aim to fill this gap, we contribute with a new palynological and geochemical dataset obtained from a sediment core drilled in the continental shelf of the Algarve coast. Archaeological data have been correlated with our multi-proxy dataset to understand how human groups adapted to environmental changes during the Early-Mid Holocene, with special focus on the Mesolithic to Neolithic transition. Vegetation trends indicate warm conditions at the onset of the Holocene followed by increased moisture and forest development ca. 10–7 ka BP, after which woodlands are progressively replaced by heaths. Peaks of aridity were identified at 8.2 and 7. 5 ka BP. Compositional, textural, redox state, and weathering of source area geochemical proxies indicates abrupt palaeoceanographic modifications and gradual terrestrial changes at 8.2 ka BP, while the 7.5 ka BP event mirrors a decrease in land moisture availability. Mesolithic sites are mainly composed of seasonal camps with direct access to the coast for the exploitation of local resources. This pattern extends into the Early Neolithic, when these sites coexist with seasonal and permanent occupations located in inland areas near rivers. Changes in settlement patterns and dietary habits may be influenced by changes in coastal environments caused by the sea-level rise and the impact of the 8.2 and 7.5 ka BP climate events.

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“…So, Ca is related to high lake level phases and high Mn/Fe ratios. Increases in the Si/Al ratio can be interpreted as increases in quartz/clay minerals ratio which, in turn, represent changes in grains/matrix ratio (Santisteban et al, 2019). The quartz source can be placed both in the beach-barrier (clay-poor inputs related to storms) or in inland areas (from surface runoff during floods and/or during low water levels, usually together with clay minerals).…”

Section: Geochemical Proxiesmentioning

confidence: 99%

“…The lacustrine records studied in the central Spain are rare: i.e. Las Tablas de Daimiel (Mediavilla et al, 2013;Santisteban et al, 2019) giving an incomplete picture of the climatic evolution for this period (Giralt et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Aridity events during the last 4000 years in Western Mediterranean marshes (Almenara and Benicasim marshes, E Spain)

Arribas

Santisteban

Moral

et al. 2020

Quaternary International

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Holocene floods in a complex fluvial wetland in central Spain: Environmental variability, climate and time

Cited by 8 publications

References 50 publications

Evidence for strong relations between the upper Tagus loess formation (central Iberia) and the marine atmosphere off the Iberian margin during the last glacial period

Evidence for strong relations between the upper Tagus loess formation (central Iberia) and the marine atmosphere off the Iberian margin during the last glacial period

Environmental Changes and Cultural Transitions in SW Iberia during the Early-Mid Holocene

Aridity events during the last 4000 years in Western Mediterranean marshes (Almenara and Benicasim marshes, E Spain)

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