Sidonie Révillon

Mantle contribution and crustal fluid pathways along lithospheric-scale faults during tectonic switches

Bérénice Cateland, Nicolas E. Beaudoin, Frédéric MOUTHEREAU, Anne Battani et autres

Lithospheric-scale fault permeability exerts primary control on migration of fluid and distribution of strategic resources (ore deposits, fluids and heat). Although tectonic regime changes are expected to strongly influence fault connectivity and therefore fluid circulation, direct records of their evolution through time …

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Radiolysis and Fe‐Biotite Alteration: Questioning the Origin of H 2 ‐Bearing Fluid Inclusions in the Yorke Peninsula Granites, South Australia

Ugo Geymond, Dan Lévy, Julien Bourdet, Isabelle Martínez et autres

Abstract Multiple drillings in the Yorke Peninsula, South Australia, recently confirmed the presence of natural hydrogen (H 2 ) in shallow sedimentary units. While radiolysis and Fe‐oxidation in the basement are potential generation mechanisms, their respective contributions remain unconstrained. This study investigates …

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Volcanic History of Rodrigues Island and Its Relationship With the Central Indian Ridge and the Réunion Hotspot

Julien Seghi, Vincent Famin, Xavier Quidelleur, Loraine Gourbet et autres

Abstract Many intraplate volcanic chains are explained as hotspot trails formed by plate motion over mantle plumes, yet some deviate from this model. The Rodrigues Ridge, a volcanic lineament extending eastward from the Réunion hotspot track toward the Central Indian Ridge (CIR), …

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A New mantle source contributing to volcanism in the Indian Ocean

Julien Seghi, François Nauret, Vincent Famin, Xavier Quidelleur et autres

Intra-plate volcanism is commonly attributed to mantle plumes originating from deep-seated therm0-chemical anomalies that rise buoyantly through the mantle and puncture the overlying lithosphere. These long-lived magmatic systems can persist for tens of millions of years, producing age-progressive volcanic chains and, in …

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From German Mines to Le Nôtre's Gardens: The Origin of the Lead in the Fountains of Vaux‐le‐Vicomte and Versailles (Île‐de‐France, France)

Céline Tomczyk, Daniella Malnar, Christophe Petit, Sidonie Révillon et autres

ABSTRACT This article presents the results of an isotopic study of the lead used in the fountains of the gardens at the palaces of Versailles and Vaux‐le‐Vicomte—two iconic examples of French formal gardens designed by André Le Nôtre. The construction of these …

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Petrogenetic processes in alkaline magmatism in the southern Mozambique Channel

Carole Berthod, Patrick Bachèlery, Sidonie Révillon, Régis Doucelance et autres

Whereas the northern part of the Mozambique Channel, between the eastern coast of Africa and Madagascar, is intensively studied, the southern part remains poorly investigated. The 2014 PAMELA-MOZ01 and 2015 PAMELA-MOZ04 cruises enabled us to collect volcanic rocks from the submarine flanks …

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Mössbauer spectroscopy: a key tool to quantify Fe-speciation and distribution in H2-generating rocks

Ugo Geymond, Keanu Loiseau, Vincent Roche, G. Pasquet et autres

Oxidation of Fe 2+ by anoxic water in the subsurface is a key geochemical process, contributing to the formation of natural dihydrogen (H 2 ). The development and application of effective tools to accurately characterize the content and speciation of iron in …

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History of the Rodrigues Ridge, Indian Ocean: implications of the Réunion hotspot and the Central Indian Ridge

julien Seghi, Vincent Famin, Xavier Quidelleur, Loraine Gourbet et autres

The Rodrigues Ridge (Indian Ocean) is a N100°E oriented submarine volcanic structure stretching eastward of the Mascarene Plateau and toward the Central Indian Ridge (CIR). The geodynamic origin of Rodrigues’ volcanism is a matter of debate because the ridge neither follows the …

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Ridge extinction in the Mascarene Basin due to the Réunion hotspot: preliminary results of the MASC Cruise

Vincent Famin, Martin Danišík, Sidonie Révillon, Sébastien Zaragosi et autres

The Mascarene Basin, between Madagascar, the Seychelles Plateau, and the Réunion hotspot track, is an ocean lithosphere whose geodynamic evolution remains enigmatic in many aspects. Part of the enigma concerns the unexplained extinction of the Mascarene mid-ocean ridge ca. 62 Ma ago …

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Past trajectory of a socio-ecosystem at the land-sea interface: the case of the northern watersheds of the Bay of Brest over the last 150 years

Clara Valero, Aurélie Penaud, Muriel Vidal, Sabine Schmidt et autres

The Bay of Brest (BB) is a macro-tidal estuarine environment that has been exposed to strong anthropogenic pressures over the last decades, especially after the Second World War. It is therefore considered as a regional pilot site for addressing coastal ecosystem transformations …

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Phases of Magmatism and Tectonics Along the Madagascar‐Comoros Volcanic Chain, and Synchronous Changes in the Kinematics of the Lwandle and Somalia Plates

Anaïs Rusquet, Vincent Famin, Laurent Michon, Xavier Quidelleur et autres

Abstract This paper aims to solve the longstanding debate on the origin of the Comoros volcanic archipelago (Mozambique Channel, Indian Ocean) concerning whether it represents a hotspot trail or a boundary between the Lwandle and Somalia plates in possible connection with the …

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Radiolysis and Fe-Biotite Alteration: Questioning the Origin of H2-Bearing Fluid Inclusions in the Yorke Peninsula Granites, South Australia

Ugo Geymond, Dan Lévy, Julien Bourdet, Isabelle Martínez et autres

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