Les paléo-rivages des formations littorales atlantiques du Pléistocène moyen – supérieur de Rabat-Témara (Maroc)

Chahid, Driss; Boudad, Larbi; Lenoble, Arnaud; Lamothe, Michel; Chakroun, Amel; Falguères, Christophe; Nespoulet, Roland

doi:10.1016/j.anthro.2017.03.012

Cited by 10 publications

(16 citation statements)

References 8 publications

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“…2a, b), consisting of hundreds of boulders with estimated masses between a few and more than 100 t (Mhammdi et al, 2008;Medina et al, 2011). The geomor-phology and geology of this area is characterized by a succession of coast-parallel, Pleistocene calcarenite ridges that are related to sea-level highstands and rest on a Palaeozoic basement (Chakroun et al, 2017). A typical cross section ( Fig.…”

Section: Exploiting Geological Evidence For Hazard Assessment -The Ramentioning

confidence: 99%

“…A typical cross section ( Fig. 2c, d) is composed of (i) the intertidal platform with an active coastal cliff; (ii) the youngest lithified calcarenite ridge, formed during Marine Isotope Stage (MIS) 5; (iii) an inter-ridge depression, called Oulja, which may be flooded at high tide (the spring tide range is 2-3 m) and which is covered by recent and/or Holocene beach deposits; and (iv) an older calcarenite ridge, probably formed during MIS 7, including an inactive cliff (Medina et al, 2011;Chakroun et al, 2017;Chahid et al, 2017). Towards Rabat, the younger calcarenite ridge is replaced by a simple sandstone platform ( Fig.…”

Section: Exploiting Geological Evidence For Hazard Assessment -The Ramentioning

confidence: 99%

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Evaluating optically stimulated luminescence rock surface exposure dating as a novel approach for reconstructing coastal boulder movement on decadal to centennial timescales

et al. 2021

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Abstract. Wave-transported boulders represent important records of storm and tsunami impact over geological timescales. Their use for hazard assessment requires chronological information on their displacement that in many cases cannot be achieved by established dating approaches. To fill this gap, this study investigated, for the first time, the potential of optically stimulated luminescence rock surface exposure dating (OSL-RSED) for estimating cliff-detachment ages of wave-transported coastal boulders. The approach was tested on calcarenite clasts at the Rabat coast, Morocco. Calibration of the OSL-RSED model was based on samples with rock surfaces exposed to sunlight for ∼ 2 years, and OSL exposure ages were evaluated against age control deduced from satellite images. Our results show that the dating precision is limited for all targeted boulders due to the local source rock lithology which has low amounts of quartz and feldspar. The dating accuracy may be affected by erosion rates on boulder surfaces of 0.02–0.18 mm yr−1. Nevertheless, we propose a robust relative chronology for boulders that are not affected by significant post-depositional erosion and that share surface angles of inclination with the calibration samples. The relative chronology indicates that (i) most boulders were detached from the cliff by storm waves; (ii) these storms lifted boulders with masses of up to ∼ 24 t; and (iii) the role of storms in the formation of boulder deposits along the Rabat coast is more significant than previously assumed. Although OSL-RSED cannot provide reliable absolute exposure ages for the coastal boulders in this study, the approach has large potential for boulder deposits composed of rocks with larger amounts of quartz or feldspar and less susceptibility to erosion.

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Section: Exploiting Geological Evidence For Hazard Assessment -The Ramentioning

confidence: 99%

Section: Exploiting Geological Evidence For Hazard Assessment -The Ramentioning

confidence: 99%

Evaluating optically stimulated luminescence rock surface exposure dating as a novel approach for reconstructing coastal boulder movement on decadal to centennial timescales

et al. 2021

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“…The cave is shaped on a calcarenite cliff on the Atlantic coast and opens onto the Ouljian cliff formed during the high sea level of the last interglacial, ca. 130-125 ka [24,25,32,33]. The substratum is formed by local Plio-Pleistocene indurated dunes, which deposition ended around MIS 5e/5c [32,33].…”

Section: El Mnasra Cave: Stratigraphy Lithic Assemblage and Existing ...mentioning

confidence: 99%

“…130-125 ka [24,25,32,33]. The substratum is formed by local Plio-Pleistocene indurated dunes, which deposition ended around MIS 5e/5c [32,33].…”

Section: El Mnasra Cave: Stratigraphy Lithic Assemblage and Existing ...mentioning

confidence: 99%

An improved chronology for the Middle Stone Age at El Mnasra cave, Morocco

et al. 2022

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North African coastal Middle Stone Age (MSA) sites are key to study the development and expansion of early H. sapiens. El Mnasra cave on the Atlantic coast of Morocco (Témara region) is a crucial site associated with MSA archaeological materials considered advanced cognitive hallmarks of behavioural innovation, such as numerous Nassariidae perforated shells, hematite pigments, bones industry and coastal resources exploitation. We provide new trapped-charges dates (OSL and combined US-ESR ages). Our Bayesian modelling strengthens the new lithostratigraphic interpretation of the cave stratigraphic units (US) and we propose an updated chronostratigraphic model for the Middle Stone Age archaeo-sequence of El Mnasra Cave. We confirm a human presence between 124–104 ka, earlier than what the previous OSL and US-ESR data showed. Our time range intervals allowed us to also extend the age of the MSA occupations considerably to the MIS 4/3 (~62–30 ka), marked by the disappearance of the Nassariidae perforated shells. Outstandingly, our model pushed back the age of the largest record of Nassariidae perforated shells and placed the age of their use by the Aterian groups at El Mnasra from the MIS 5d-5b (~115–94 ka).

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“…A typical cross section (Fig. 2c,d) is composed of: (i) the intertidal 145 platform with an active coastal cliff; (ii) the youngest lithified calcarenite ridge, formed during MIS 5; (iii) an inter-ridge depression, called Oulja, which may be flooded at high tide (the spring tide range is 2-3 m), and which is covered by recent and/or Holocene beach deposits; and (iv) an older calcarenite ridge, probably formed during MIS 7, including an inactive cliff (Medina et al, 2011;Chakroun et al, 2017;Chahid et al, 2017). Towards Rabat, the younger calcarenite ridge is replaced by a simple sandstone platform (Fig.…”

mentioning

confidence: 99%

OSL rock surface exposure dating as a novel approach for reconstructing transport histories of coastal boulders over decadal to centennial timescales

Brill

May

Mhammdi

et al. 2020

Preprint

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Abstract. Wave-transported boulders represent important records of storm and tsunami impact over geological timescales. Their use for hazard assessment requires chronological information that in many cases cannot be achieved by established dating approaches. To fill this gap, this study investigated, for the first time, the potential of optically stimulated luminescence rock surface exposure dating (OSL-RSED) for estimating transport ages of wave-emplaced coastal boulders. The approach was applied to calcarenite clasts at the Rabat coast, Morocco. Calibration of the OSL-RSED model was based on samples with rock surfaces exposed to sunlight for ~ 2 years, and OSL exposure ages were evaluated against age control deduced from satellite images. Our results show that the dating precision is limited for all boulders due to the local source rock lithology which has low amounts of quartz and feldspar. The dating accuracy may be affected by erosion rates on boulder surfaces of 0.06–0.2 mm/year. Nevertheless, we propose a robust relative chronology for boulders that are not affected by significant post-depositional erosion and that share surface angles of inclination with the calibration samples. The relative chronology indicates that (i) most boulders were moved by storm waves; (ii) these storms lifted boulders with masses of up to ~ 40 t; and (iii) the role of storms for the formation of boulder deposits along the Rabat coast is much more significant than previously assumed. Although OSL-RSED cannot provide reliable absolute exposure ages for the coastal boulders in this study, the approach has large potential for boulder deposits composed of rocks with larger amounts of quartz or feldspar, older formation histories and less susceptibility to erosion.

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Les paléo-rivages des formations littorales atlantiques du Pléistocène moyen – supérieur de Rabat-Témara (Maroc)

Cited by 10 publications

References 8 publications

Evaluating optically stimulated luminescence rock surface exposure dating as a novel approach for reconstructing coastal boulder movement on decadal to centennial timescales

Evaluating optically stimulated luminescence rock surface exposure dating as a novel approach for reconstructing coastal boulder movement on decadal to centennial timescales

An improved chronology for the Middle Stone Age at El Mnasra cave, Morocco

OSL rock surface exposure dating as a novel approach for reconstructing transport histories of coastal boulders over decadal to centennial timescales

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