Jean‐Louis Paquette

Laboratoire Magmas et Volcans

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Co-Authors

Valérie Bosse

Laboratoire Magmas et Volcans

Marc Poujol

Centre National de la Recherche Scientifique

Christian Pin

Centre National de la Recherche Scientifique

Jean‐François Moyen

Université Jean Monnet

Jean-Jacques Peucat

Géosciences Rennes

Philippe Hervé Leloup

Laboratoire de Géologie de Lyon : Terre, Planètes et Environnement

Françoise Roger

Centre National de la Recherche Scientifique

Philippe Gonçalves

Laboratoire Chrono-Environnement

Abdelmouhcine Gannoun

Laboratoire Magmas et Volcans

Gweltaz Mahéo

École Normale Supérieure de Lyon

Cooperative Institutions

Centre National de la Recherche Scientifique

341

Institut de Recherche pour le Développement

133

Laboratoire Magmas et Volcans

Institut des Sciences de la Terre

Université Clermont Auvergne

Université Claude Bernard Lyon 1

Université Toulouse III - Paul Sabatier

Université de Montpellier

Institut de physique du globe de Paris

Université de Toulouse

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Garnet as a monitor for melt–rock interaction: Textural, mineralogical, and compositional evidence of partial melting and melt-driven metasomatism

Goldschmidt Abstracts (2021)

Philippe Gonçalves Tom Raimondo Jean‐Louis Paquette Jailma Santos de Souza de Oliveira

Metasomatism

10.7185/gold2021.5156

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Citations (1)

Meteoric water infiltration in the Variscan crust during the orogenic collapse: O isotope characterization and U-Th-Pb dating along the South Armorican shear zone

Romain Tartèse Philippe Boulvais Marc Poujol Thomas Chevalier Jean‐Louis Paquette

The South Armorican Shear Zone (SASZ; Jegouzo, 1980) is a major dextral wrench zone active during the Carboniferous. It is located in the Armorican Massif, within the French Variscan orogenic belt. The localization of the deformation along this feature has enhanced the local permeability, which in turn, channelled fluid circulations. Oxygen isotope characterization of mylonitized rocks along the SASZ evidenced meteoric water circulation in two of the sampled quarries (d18OWR down to 1.5). Fluid-rock interactions locally led to noticeable silica leaching, indicating downward motion of meteoric fluids. In the altered samples, zircon and monazite LA-ICP-MS U-Th-Pb analyses have been performed in-situ on separated loose grains and in-context in thin section. In both cases, zircon UPb data show the presence of both common Pb contamination and continuous Pb-loss, and yield late Variscan ages around 300 Ma. In one sample, monazites were also analysed and yield a consistent 207Pb-235U mean age of 299.6 ± 3.6 Ma. Numerous giant quartz veins are located along the SASZ (Lemarchand et al., submitted). Veins parallel to the SASZ mostly derive from metamorphic fluids, whereas veins oblique to the SASZ are characterized by d18O as low as -2, and are interpreted as crustal-scale tension gashes corresponding to highly-permeable zones capable of draining large quantities of fluids returning to the surface. Their sub-meridian orientation is compatible with a N-S shortening direction (Gumiaux et al., 2004). Combined O isotope and U-Th-Pb studies demonstrate that a meteoric water convective cycle existed in this portion of the Variscan orogen during the orogenic collapse. The mylonitized SASZ acted as a drain for the descending meteoric fluids while quartz veins are the witnesses of upgoing paths.

Massif

Mylonite

Leucogranite

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A reappraisal of the Variscan tectono-metamorphic evolution in the basement of the Aiguilles-Rouges massif (Alpine External Crystalline Massifs, France-Switzerland).

HAL (Le Centre pour la Communication Scientifique Directe) (2021)

Jonas Vanardois Pierre Trap Françoise Roger Fabrice Barou Pierre Lanari

Massif

Basement

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Large-magnitude (VEI ≥ 7) ‘wet’ explosive silicic eruption preserved a Lower Miocene habitat at the Ipolytarnóc Fossil Site, North Hungary

Scientific Reports (2022)

Dávid Karátson Tamás Bíró Maxim Portnyagin Balázs Kiss Jean‐Louis Paquette

Abstract During Earth’s history, geosphere-biosphere interactions were often determined by momentary, catastrophic changes such as large explosive volcanic eruptions. The Miocene ignimbrite flare-up in the Pannonian Basin, which is located along a complex convergent plate boundary between Europe and Africa, provides a superb example of this interaction. In North Hungary, the famous Ipolytarnóc Fossil Site, often referred to as “ancient Pompeii”, records a snapshot of rich Early Miocene life buried under thick ignimbrite cover. Here, we use a multi-technique approach to constrain the successive phases of a catastrophic silicic eruption (VEI ≥ 7) dated at 17.2 Ma. An event-scale reconstruction shows that the initial PDC phase was phreatomagmatic, affecting ≥ 1500 km 2 and causing the destruction of an interfingering terrestrial–intertidal environment at Ipolytarnóc. This was followed by pumice fall, and finally the emplacement of up to 40 m-thick ignimbrite that completely buried the site. However, unlike the seemingly similar AD 79 Vesuvius eruption that buried Pompeii by hot pyroclastic density currents, the presence of fallen but uncharred tree trunks, branches, and intact leaves in the basal pyroclastic deposits at Ipolytarnóc as well as rock paleomagnetic properties indicate a low-temperature pyroclastic event, that superbly preserved the coastal habitat, including unique fossil tracks.

Silicic

Silicic acid

10.1038/s41598-022-13586-3

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Citations (13)

Pre-Cadomian to late-Variscan odyssey of the eastern Massif Central, France: Formation of the West European crust in a nutshell

Gondwana Research (2017)

Cyril Chelle-Michou Oscar Laurent Jean‐François Moyen Sylvain Block Jean‐Louis Paquette

Protolith

Massif

Migmatite

Detritus