Tephrochronology of the Mont-Dore volcanic Massif (Massif Central, France): new 40Ar/39Ar constraints on the Late Pliocene and Early Pleistocene activity

Nomade, Sébastien; Pastre, Jean‐François; Nehlig, Pierre; Guillou, Hervé; Scao, Vincent; Scaillet, Stéphane

doi:10.1007/s00445-014-0798-6

Cited by 12 publications

(1 citation statement)

References 29 publications

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“…In the French Massif Central, two large stratovolcanoes are known: the Cantal and the Mont-Dore massifs. The youngest of these (Mont-Dore) covers an area of 500 km 2 , rests on the Variscan basement, and was active between 3.1 Ma and 200 ka [18]. Several temporary ponds are found in the Mont-Dore massif, one of them managed by a national natural reserve.…”

Section: Introductionmentioning

confidence: 99%

Temporal Evolution of Diatoms in a Temporary Pond Situated in the Massif du Sancy Mountains (Massif Central, France) and Description of a New Pinnularia Species

et al. 2020

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A floristic survey was performed on a temporary pond, “Laqui du Seignavoux”, situated in the Mont-Dore massif of the French Massif Central, between 2017 and 2019. Except in 2017, each year, we performed four sampling campaigns from April/May to December. Water samples and diatoms were collected. The temporary pond evolved from a poorly mineralized ecosystem due to snow, inducing oligotrophic and oligosaprobic water, well oxygenated in spring, to a more mineralized, less oxygenated, eutrophic–hypereutrophic, and polysaprobic environment in summer. This change in abiotic conditions was found to be linked to the presence of cattle, beginning in May, that trample and excrete in the pond, leading to higher ammonium and nitrate concentrations. During this period, the dominant species were Pinnularia sp., Nitzschia palea, and Nitzschia palea var. tenuirostris. In spring and winter, different species of Eunotia dominated the community such as Eunotia pseudogroenlandica. Finally, light microscopy (LM) and scanning electron microscopy (SEM) observations on a new species of the genus Pinnularia from the temporary pond are presented and the ecological preferences are discussed.

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Section: Introductionmentioning

confidence: 99%

Temporal Evolution of Diatoms in a Temporary Pond Situated in the Massif du Sancy Mountains (Massif Central, France) and Description of a New Pinnularia Species

et al. 2020

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Volcanism of the Monts Dore (French Massif Central)

Gourgaud

2016

Lake Pavin

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Eruption and emplacement dynamics of a thick trachytic lava flow of the Sancy volcano (France)

et al. 2016

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International audienceA 70-m-thick, 2200-m-long (51 × 106 m3) trachyticlava flow unit underlies the Puy de Cliergue (Mt. Dore,France). Excellent exposure along a 400-m-long and 60- to85-m-high section allows the flow interior to be accessed ontwo sides of a glacial valley that cuts through the unit. Wecompleted an integrated morphological, structural, textural,and chemical analysis of the unit to gain insights into eruptionand flow processes during emplacement of this thick siliciclava flow, so as to elucidate the chamber and flow dynamicprocessed that operate during the emplacement of such systems.The unit is characterized by an inverse chemical stratification,where there is primitive lava beneath the evolvedlava. The interior is plug dominated with a thin basal shearzone overlying a thick basal breccia, with ramping affectingthe entire flow thickness. To understand these characteristics,we propose an eruption model that first involves processesoperating in the magma chamber whereby a primitive meltis injected into an evolved magma to create a mixed zone atthe chamber base. The eruption triggered by this event firstemplaced a trachytic dome, into which banded lava from thechamber base was injected. Subsequent endogenous domegrowth led to flow down the shallow slope to the east onwhich the highly viscous (1012 Pa s) coulée was emplaced.The flow likely moved extremely slowly, being emplacedover a period of 4–10 years in a glacial manner, where a thick(>60-m) plug slid over a thin (5-m-thick) basal shear zone. Excellent exposure means that the Puy de Cliergue complexcan be viewed as a case type location for understanding anddefining the eruption and emplacement of thick, high-viscosity,silicic lava flow systems

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Tephrochronology of the Mont-Dore volcanic Massif (Massif Central, France): new 40Ar/39Ar constraints on the Late Pliocene and Early Pleistocene activity

Abstract: International audienc

Cited by 12 publications

References 29 publications

Temporal Evolution of Diatoms in a Temporary Pond Situated in the Massif du Sancy Mountains (Massif Central, France) and Description of a New Pinnularia Species

Temporal Evolution of Diatoms in a Temporary Pond Situated in the Massif du Sancy Mountains (Massif Central, France) and Description of a New Pinnularia Species

Volcanism of the Monts Dore (French Massif Central)

Eruption and emplacement dynamics of a thick trachytic lava flow of the Sancy volcano (France)

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