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French Guiana margin evolution: From Gondwana break‐up to Atlantic opening

Abstract : Knowledge of the Guiana Shield evolution during the Gondwana break-up is key to a better understanding of craton dynamics and margin response to transtensional opening. To improve this knowledge, we investigated the dynamics and thermal evolution of French Guiana, using several low-temperature thermochronology methods applied to basement rocks, including apatite and zircon (U-Th)/He and apatite fission tracks. Inverse modelling of results allows us to reconstruct the Phanerozoic thermal history of French Guiana margin and to give a preview of the Guiana Shield evolution. Three main events are inferred: firstly, a long-term period of relative stability since ~1.2 Ga, with no strong evidence for any erosional or burial event (>5–7 km); secondly, a heating phase between ~210 and ~140 Ma consistent with the Central Atlantic Magmatic Province-related event. Finally, an exhumation phase between ~140 and ~90 Ma, triggered by the Equatorial Atlantic opening, brought samples close to the surface (<40°C).
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https://hal-brgm.archives-ouvertes.fr/hal-03747359
Contributeur : Frédérique COUFFIGNAL Connectez-vous pour contacter le contributeur
Soumis le : lundi 8 août 2022 - 10:53:56
Dernière modification le : mercredi 10 août 2022 - 03:22:32

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Alexis Derycke, Cécile Gautheron, Jocelyn Barbarand, Pierre Bourbon, Geoffrey Aertgeerts, et al.. French Guiana margin evolution: From Gondwana break‐up to Atlantic opening. Terra Nova, Wiley-Blackwell, 2021, 33 (4), pp.415-422. ⟨10.1111/ter.12526⟩. ⟨hal-03747359⟩

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