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Theses

Signification des âges U-Pb sur zircon dans l'histoire métamorphique de Naxos et Ikaria (Cyclades, Grèce)

Abstract : The knowledge of pressure - temperature - time paths in metamorphic rocks is necessary to the understanding of orogenic belts evolution. U-Pb method is commonly used for dating metamorphic events, but the link between metamorphic conditions and ages obtained on zircon is not straightforward. Oxygen isotopes are proposed in this study for likening zircon to garnet growth in metamorphic rocks of the Aegean domain. The study of four samples from Naxos island showed that this correlation is possible if (i) isotopic equilibrium of oxygen is reached between garnet and zircon during their formation and (ii) garnet and zircon remained in closed system for oxygen and lead after their formation. This method permitted to date the beginning of the exhumation of metamorphic rocks from Naxos between 40 and 60 Ma, and the beginning of the retrograde path between 13 and 19 Ma. The preferential formation of zircon between 40 and 60 Ma in rocks localised in schist rich zones indicate that pressure and fluid circulation are the parameters that triggered zircon formation during the metamorphism.
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Theses
File URL :
http://docnum.univ-lorraine.fr/prive/SCD_T_2004_0231_MARTIN.pdf
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https://hal.univ-lorraine.fr/tel-01746698
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Submitted on : Thursday, March 29, 2018 - 10:42:54 AM
Last modification on : Thursday, February 25, 2021 - 9:46:09 AM

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  • HAL Id : tel-01746698, version 1

Citation

Laure Martin. Signification des âges U-Pb sur zircon dans l'histoire métamorphique de Naxos et Ikaria (Cyclades, Grèce). Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2004. Français. ⟨NNT : 2004NAN10231⟩. ⟨tel-01746698⟩

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