Un cadre téphrostratigraphique réactualisé pour la préhistoire tardiglaciaire et holocène de Limagne (Massif central, France)

Vernet, Gérard; Raynal, Jean‐Paul

doi:10.1016/s1251-8050(00)00149-x

Cited by 16 publications

(22 citation statements)

References 8 publications

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“…On the basis of petrographic and SEM observations, the mineral composition of these tephra layers has been extensively described in Vanniere et al (2004). Sample 345 cm corresponds to the LST as classically observed in other European sites (van der Bogaard and Schmincke, 1985), whereas the mineral composition of the LAUT 1 and LAUT 2 horizons suggests a trachytic volcanism similar to the Chaîne des Puys volcanoes in the Massif Central (France), where two tephras from Le Puy de la Nugère have been dated by Juvigné et al (1996) and Vernet and Raynal (2000) to 12,010±150 and 11,360±130 14 C yr BP (Vanniere et al, 2004).…”

Section: The Mineralogy and Grain-size Recordsmentioning

confidence: 56%

Environmental and climatic changes in the Jura mountains (eastern France) during the Lateglacial–Holocene transition: a multi-proxy record from Lake Lautrey

Magny

Aalbersberg

Bégeot

et al. 2006

Quaternary Science Reviews

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This paper presents a multi-proxy reconstruction of the climatic and environmental changes during the Last Glacial-Interglacial transition as recorded by a sediment sequence from Lake Lautrey (Jura, eastern France). This reconstruction is based on analysis of pollen, chironomid, organic matter, oxygen-isotope, mineralogical, magnetic susceptibility and inferred lake-level data at a high temporal resolution. The chronology is derived using AMS radiocarbon dates, the position of the Laacher See Tephra (LST), and of correlation between the Lautrey and GRIP oxygen-isotope records. This data set reveals a detailed sequence of environmental changes in the Jura mountains from Greenland Stadial 2a to the early Holocene. Biotic and abiotic indicators allow the recognition of major abrupt changes associated with the GS2a/GI-1e, GI-1a/GS-1 and GS-1/Preboreal transitions, and other minor fluctuations related to the cold events GI-1d, GI-1b and the Preboreal oscillation (PBO). They also suggest additional cooling spells at ca 14,550 and 14,350 cal yr BP (Intra-Bølling Cold Periods), at ca 13,500 and ca 12,700 cal yr BP just before the GS-1 onset, and at ca 11,350 cal yr BP just before the PBO, as well as an intriguing brief warming episode within GS-1 at ca 12,080 cal yr BP. Summer temperature increased by ca 5 °C at the start of GI-1e, and by 1.5-3 °C at the Holocene onset, while it decreased by ca 3-4 °C at the beginning of GS-1. Major changes in local hydrology and in seasonality appear to be also associated with the GS-2a/GI1e, GI-1a/GS-1 and GS-1/Preboreal transitions. Pollen and abiotic indicators suggest a greater sensitivity of the vegetation cover to climatic oscillations during the first part of the Lateglacial Interstadial than during the second part (after ca 13,700 cal yr BP), when a closed forest had been restored in this area. By contrast, the restoration of forest cover took less than 300 yr after the end of GS-1. At the beginning of GI-1e and GS-1, no lag occurs (within the sampling resolution of 20-50 yr) in the responses of aquatic (chironomids) and terrestrial (pollen) ecosystems, while, at the onset of the Holocene, the response of the vegetation appears slightly delayed in comparison with that of the chironomid community. Finally, the recognition of two successive tephra layers, which were deposited just before the LST at ca 12,950 cal yr BP and which originated from Le Puy de la Nugère (Massif Central, France), provides an additional tephrochronological tool for correlation between Lateglacial European sequences.

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Section: The Mineralogy and Grain-size Recordsmentioning

confidence: 56%

Environmental and climatic changes in the Jura mountains (eastern France) during the Lateglacial–Holocene transition: a multi-proxy record from Lake Lautrey

Magny

Aalbersberg

Bégeot

et al. 2006

Quaternary Science Reviews

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“…2) ; les dépôts de bassins distaux en sont systéma-tiquement dépourvus. Ces observations soulèvent deux principales questions relatives à l'âge et à l'occurrence des retombées volcaniques : (1) comment se placent les téphras rencontrés à Sarliève parmi les nombreux té-phras issus de la chaîne des Puys toute proche [7] et dont certains ont atteint la Limagne du Dryas ancien à l'Atlantique [30,33], la retombée la plus récente identifiée étant celle du Pavin, vers 6,6/6,7 ka (5800/5900 BP) [16] ? (Précisons qu'à l'exception des âges notés BP, les âges sont donnés au sens habituel du terme.)…”

Section: Version Française Abrégéeunclassified

“…(2) Pourquoi les téphras sont-ils présents dans les zones proximales et absents en zones distales dans le bassin sédi-mentaire ? L'unité de téphra T1, la plus ancienne dans la série lacustre, a été identifiée sur des critères minéralogiques et géochimiques comme correspondant à une retombée en place de la partie basale du tephra CF1 (CF1a), a composition de magma trachyandésitique basaltique, issu du puy de la Nugère [30][31][32][33][34]. Ce téphra, présent en de nombreux points de la Grande Limagne, est un marqueur chronostratigraphique daté à environ 13,7 ± 0,4ka(2δ) (environ 12 000 BP, moyenne de trois datations préci-sées dans [33]).…”

Section: Version Française Abrégéeunclassified

“…L'unité de téphra T1, la plus ancienne dans la série lacustre, a été identifiée sur des critères minéralogiques et géochimiques comme correspondant à une retombée en place de la partie basale du tephra CF1 (CF1a), a composition de magma trachyandésitique basaltique, issu du puy de la Nugère [30][31][32][33][34]. Ce téphra, présent en de nombreux points de la Grande Limagne, est un marqueur chronostratigraphique daté à environ 13,7 ± 0,4ka(2δ) (environ 12 000 BP, moyenne de trois datations préci-sées dans [33]). D'autres lits de téphras âgés d'environ 12 000 BP et attribués à la Nugère ont préalablement été trouvés en Limagne [17] ; la similitude des âges soulève la possibilité d'une équivalence entre ces deux occurrences.…”

Section: Version Française Abrégéeunclassified

“…When interbedded in sedimentary piles, tephras are useful chronological markers [10]. The 'Chaîne des Puys', the youngest volcanic complex of French Massif Central, generated numerous tephras [7], some of them reached the Limagne plain from the Oldest Dryas until the Atlantic [30,33].T h e most recent identified air fall emitted in the 'Chaîne des Puys' corresponds to an eruption of the Pavin at about 6.6/6.7 ka (5800/5900 BP) [16] (it can yet be noted that, except for 14 C BP dating, ages are given using the usual word meaning). However, a more recent tephra (5.6/5.8 ka or 5020 ± 120 BP) has been evidenced in the Maar of Beaunit, so-called 'tephra de Beaunit', but its origin has not been found [15].…”

Section: Introductionmentioning

confidence: 99%

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Tephras in lacustrine sediments of the Sarliève marsh (French Massif Central): age and preservation

Fourmont

Macaire

Bréhéret

et al. 2006

Comptes Rendus. Géoscience

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The Sarliève marsh sediments (Massif Central, France) contain two tephras. The first tephra [13.7 ± 0.4ka(2 δ), ca. 12 000 BP], regionally well known, enables to date the beginning of lacustrine infill to the Lateglacial. The second tephra, the 'tephra de Sarliève', the emitting volcano of which is unknown, would be dated to around the Early Subboreal from pollen data. This occurrence, after the discovery of the 'tephra de Beaunit', emphasizes that volcanic eruption(s) occurred in the 'Chaîne des Puys' or in the volcanic Cézallier more than 1000 years after the last known eruption (Pavin) in the 'Chaîne des Puys' at around 6.6/6.7 ka (5800/5900 BP). In the Sarliève piles, these tephras, well preserved in thick and more silicated deposits of deltas, were not observed in carbonated basin sediments where they were altered. The abundance of authigenic zeolites formed during the Lateglacial in restricted depocentre lacustrine waters allows us to detect initial CF1 tephra occurrence. . Le plus ancien [13,7 ± 0,4ka(2 δ), environ 12 000 BP], bien connu dans la région, permet de dater le début du remplissage sédimentaire de la cuvette lacustre du Tardiglaciaire. D'après les assemblages polliniques des sédiments qui le contiennent, le « tephra de Sarliève », émis par un appareil volcanique non identifié, pourrait dater du début du Subboréal. Cette découverte, faisant suite à celle du « tephra de Beaunit », suggère une (des) éruption(s) volcanique(s) dans la chaîne des Puys ou dans le Cézallier volcanique, plus récente(s) d'environ 1000 ans que la dernière éruption connue dans la chaîne des Puys (Pavin). À Sarliève, les tephras, bien conservés dans les dépôts plus épais et silicatés de deltas, s'estompent dans les dépôts carbonatés de bassins où ils ont été altérés. L'abondance de zéolites authigènes formées au Tardiglaciaire dans les eaux lacustres confinées des bassins est un bon traceur de la présence initiale du tephra CF1. Pour citer cet article : A. Fourmont et al., C. R. Geoscience 338 (2006).

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Episodic Quaternary volcanism in France and Germany

Nowell

Jones

Pyle

2006

J Quaternary Science

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Intra-plate volcanism in western Europe shows statistically significant episodicity during the Quaternary period. By comparing the known ages for eruptions in France and Germany, which are compiled here, with a composite oxygen isotope record, we have investigated the link between this episodic volcanism and the climate record over the last two million years. We show that increased volcanism between 415-400 ka and 17-5 ka correlates with warming phases at the end of the last Weichselian (Devensian) and earlier Elsterian (Anglian) glacial stages. The three significant caldera explosions in the eastern Eifel, Germany, are all associated with warming phases at the onset of interglacials. The growth and decay of nearby ice sheets suggest that surface changes in continental mass distribution during glacial Milankovich cycles could provide a mechanism for this correlation by means of the distal effects of flexural loading on the lithosphere.

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Un cadre téphrostratigraphique réactualisé pour la préhistoire tardiglaciaire et holocène de Limagne (Massif central, France)

Cited by 16 publications

References 8 publications

Environmental and climatic changes in the Jura mountains (eastern France) during the Lateglacial–Holocene transition: a multi-proxy record from Lake Lautrey

Environmental and climatic changes in the Jura mountains (eastern France) during the Lateglacial–Holocene transition: a multi-proxy record from Lake Lautrey

Tephras in lacustrine sediments of the Sarliève marsh (French Massif Central): age and preservation

Episodic Quaternary volcanism in France and Germany

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