Climate controls on tufa deposition over the last 5000 years: A case study from Northwest Africa

Azennoud, Khalil; Baali, Abdellatif; Brahim, Yassine Ait; Ahouach, Youssra; Hakam, Oualid

doi:10.1016/j.palaeo.2021.110767

Cited by 9 publications

(3 citation statements)

References 142 publications

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“…Several authors (Arenas et al, 2010(Arenas et al, , 2015Auqué et al, 2014 ;Sancho et al, 2015 among others) depicted a direct positive correlation between water supply and tufa precipitation, which makes tufa dams development as a proxy for wetter periods. Azennoud et al (2022) recently comforted this correlation showing that during the last 5 ka humid periods led to the aggradation of tufa dams and lake developments in central Morocco (region of Immouzzer Kandar). Similarly, pulses of tufa dam construction in the Tissint gorge directly derived from more humid periods associated with increased water supply due to increased precipitation in the paleolake Tissint catchment (Nutz et al, 2019).…”

Section: Geological Settingmentioning

confidence: 84%

A 60–50 ka African Humid Period modulated by stadial Heinrich events HE6 and HE5a in northwestern Africa

Nutz,

Kwiecien,

Buylaert

et al. 2024

Palaeogeography, Palaeoclimatology, Palaeoecology

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Section: Geological Settingmentioning

confidence: 84%

A 60–50 ka African Humid Period modulated by stadial Heinrich events HE6 and HE5a in northwestern Africa

Nutz,

Kwiecien,

Buylaert

et al. 2024

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…4). The youngest phase of maximal tufa deposition at ASI has only been faintly observed in Morocco, where only a few well-dated Holocene tufa deposits (Andrews et al, 2000;Delannoy et al, 1993;Delgado Castilla, 2009;Durán, 1996;García-García et al, 2014;Martìn-Algarra et al, 2003;Wolf et al, 2021) and from Morocco (Azennoud et al, 2022;Boudad et al, 2003;Depreux et al, 2021;Falguères et al, 2016;Lefèvre, 1989;Mercier et al, 2009;Rousseau et al, 2006;Weisrock et al, 2008) (Durán, 1996) and in northern Morocco (Rousseau et al, 2006;Weisrock et al, 2008). Localisation of sites is shown in Fig.…”

Section: Asi Tufa Chronology Compared To Other Regional Tufas and Its...mentioning

confidence: 99%

“…Figure 4. Chronological distribution of tufa deposits from southern Spain(Andrews et al, 2000;Delannoy et al, 1993;Delgado Castilla, 2009;Durán, 1996;García-García et al, 2014;Martìn- Algarra et al, 2003;Wolf et al, 2021) and from Morocco(Azennoud et al, 2022;Boudad et al, 2003;Depreux et al, 2021;Falguères et al, 2016;Lefèvre, 1989;Mercier et al, 2009;Rousseau et al, 2006;Weisrock et al, 2008) including ASI (this study, in red) compared to the evolution of Greenland δ 18 O (North Greenland Ice Core Project members, 2004) and Mediterranean forest at the SW Iberian margin (MD95-2042; Sánchez Goñi et al, 2008) during the last climatic cycle. MIS: Marine Isotopic Stage.…”

mentioning

confidence: 99%

Timing and intensity of humid interglacial and interstadial periods from the Eemian in the southwestern Mediterranean region: new chronological and stable isotope data from Aït Said ou Idder (Middle Atlas) and comparison with other regional tufa deposits (Morocco and southern Spain)

Dabkowski¹,

Wackenheim²,

Falguères

et al. 2022

E&G Quaternary Sci. J.

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Abstract. In the last few decades, multidisciplinary research on calcareous tufas as palaeoenvironmental and palaeoclimatic records has intensively grown, which has provided an increasing number of well-documented sites. Consequently, inter-site comparisons and regional- to continental-scale reviews have developed, discussing the link between tufa distribution and climate or providing diachronic comparisons of climatic and environmental conditions prevailing during Quaternary interglacials (and interstadials). This paper proposes such a review for the southeastern Mediterranean area, including new dating and isotopic data from Aït Said ou Idder (northern Morocco) to be compared with available regional data, in order to discuss the intensity of some humid periods of the last 125 kyr. According to several radiocarbon and U–Th dates, three chronological phases are indeed identified at Aït Said ou Idder: the Holocene, the Dansgaard–Oeschger (D–O) interstadial 8 and the Marine Isotopic Stage (MIS) 5e. Similarly, other tufa deposits from both Morocco and southern Spain (mostly Andalusia) appear to have preferentially developed during interglacial or interstadial periods, marked by maximal developments of the Mediterranean forest as reported in the palynological records from regional marine cores. Furthermore, isotopic data (δ18O and δ13C) from Aït Said ou Idder (and from other southeastern Mediterranean tufa deposits where available) suggest no significant difference in terms of temperature or air mass circulation between the Holocene, D–O 8 and MIS 5e. In terms of humidity conditions, no evidence of strong aridity is recorded even if D–O 8 appears drier than both interglacials. Conditions seems slightly wetter during the Holocene than during MIS 5e, but δ13C values at Aït Said ou Idder could also reflect strong differences in the seasonality of these interglacials. We demonstrate that calcareous tufa deposits have promising potential for discussing, in both space and time, the climate variability in the southeastern Mediterranean area, but new investigations, including dating and stable isotopes, are required to accurately feed such discussions.

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Quaternary fluvial carbonate deposits of the Almonda River Valley, Central Portugal

Fernandes¹,

Arenas

Ortíz

2023

J Iber Geol

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This paper discusses the formation and preservation of a fluvial tufa system influenced by Atlantic climate based on stratigraphical, chronological (amino-acid racemization, AAR), sedimentological and stable-isotope analyses. On the southwestern Iberian Peninsula, the tufas and associated deposits of the Almonda River valley occur as isolated terraced bodies and reach 25 m thick. AAR dated most deposits to within the warm Marine Isotope Stage 5 (MIS-5). Two Holocene ages were reset within MIS-5 based on diverse criteria. Widely varied carbonate and minor allochthonous coarse detrital facies occur arranged in four simple vertical associations. The deposit geometry and facies association distribution correspond to a low- to moderate-sloped fluvial valley consisting of several short knickpoints and extensive flat areas between them. The latter are occupied by slow-flowing water facies (carbonate sand, lime mud, phytoclast and oncoid rudstones, and up-growing stem boundstones). Facies that formed in moderate- to high-slope substrates were stromatolite, moss and down-growing stem boundstones. The homogeneous Miocene bedrock lithology and gentle structural deformation propitiated this depositional architecture. Calcite δ13C and δ18O values suggest that the aquifer water provided the outflowing Almonda water with (1) 18O-enriched water, compared with present precipitation and groundwater δ18O values, and (2) 13C-depleted CO2 from bituminous rocks and vegetation cover in the catchment. The proximity to the Atlantic coast favoured the Mesozoic-rock aquifer recharge with 18O-enriched water precipitation, assuring water availability during the formation of the studied tufas. No evidence of frequent intense erosion phases might indicate stable precipitation regimes, which would have allowed the preservation of loose fine-grained and palustrine deposits.

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Climate controls on tufa deposition over the last 5000 years: A case study from Northwest Africa

Cited by 9 publications

References 142 publications

A 60–50 ka African Humid Period modulated by stadial Heinrich events HE6 and HE5a in northwestern Africa

A 60–50 ka African Humid Period modulated by stadial Heinrich events HE6 and HE5a in northwestern Africa

Timing and intensity of humid interglacial and interstadial periods from the Eemian in the southwestern Mediterranean region: new chronological and stable isotope data from Aït Said ou Idder (Middle Atlas) and comparison with other regional tufa deposits (Morocco and southern Spain)

Quaternary fluvial carbonate deposits of the Almonda River Valley, Central Portugal

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