<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow/> <mml:mn>40</mml:mn> </mml:msup></mml:math>Ar/<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow/> <mml:mn>39</mml:mn> </mml:msup></mml:math>Ar geochronology of crustal deformation

Monié, Patrick; Münch, Philippe; Milesi, Gaétan; Bonno, Michael; Iemmolo, Arthur

doi:10.5802/crgeos.209

Comptes Rendus. Géoscience

2024

DOI: 10.5802/crgeos.209

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40 Ar/ 39 Ar geochronology of crustal deformation

Patrick Monié,

Philippe Münch,

Gaétan Milesi

et al.

Abstract: Crustal deformation is characterized by brittle and ductile faults that accommodate at different scales the strain imposed by plate tectonics. The aim of this contribution is to show with the help of different examples how the in situ 40 Ar/ 39 Ar dating of synkinematic neocrystallized minerals in ductile shear zones and the step-heating 40 Ar/ 39 Ar dating of synkinematic authigenic clays in fault gouges can bring information on the timing of fault activity. However, due to their complex evolution, interpreta… Show more

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Cited by 3 publications

References 144 publications

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40Ar/39Ar Age of Phengite from Sandstone of the Ophiolite-Derived Clastic Sequence of the Basin of the Rassokha River, Collision Belt of the Chersky Range

Ledneva,

Travin,

Sychev

et al. 2024

Dokl. Earth Sc.

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40Ar/39Ar Age of Phengite from Sandstone of the Ophiolite-Derived Clastic Sequence of the Basin of the Rassokha River, Collision Belt of the Chersky Range

Ledneva,

Travin,

Sychev

et al. 2024

Dokl. Earth Sc.

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Evolution of fluid redox in a fault zone of the Pic de Port Vieux thrust in the Pyrenees Axial Zone (Spain)

Charpentier,

Milesi,

Labaume

et al. 2024

Solid Earth

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Abstract. In mountain ranges, crustal-scale faults localize multiple episodes of deformation. It is therefore common to observe current or past geothermal systems along these structures. Understanding the fluid circulation channelized in fault zones is essential to characterize the thermochemical evolution of associated hydrothermal systems. We present a study of a palaeo-system of the Pic de Port Vieux thrust fault. This fault is a second-order thrust associated with the Gavarnie thrust in the Axial Zone of the Pyrenees. The study focused on phyllosilicates which permit the constraint of the evolution of temperature and redox of fluids at the scale of the fault system. Combined X-ray absorption near-edge structure (XANES) spectroscopy and electron probe microanalysis (EPMA) on synkinematic chlorite, closely linked to microstructural observations, were performed in both the core and damage zones of the fault zone. Regardless of the microstructural position, chlorite from the damage zone contains iron and magnesium (Fetotal / (Fetotal + Mg) about 0.4), with Fe3+ accounting for about 30 % of the total iron. Chlorite in the core zone is enriched in total iron, but individual Fe3+/Fetotal ratios range from 15 % to 40 %, depending on the microstructural position of the grain. Homogeneous temperature conditions about 280–290 °C have been obtained by chlorite thermometry. A scenario is proposed for the evolution of fluid–rock interaction conditions at the scale of the fault zone. It involves the circulation of a single hydrothermal fluid with homogeneous temperature but several redox properties. A highly reducing fluid evolves due to redox reactions involving progressive dissolution of hematite, accompanied by crystallization of Fe2+-rich and Fe3+-rich chlorite in the core zone. This study shows the importance of determining the redox state of iron in chlorite to calculate their temperature of formations and to consider the fluid evolution at the scale of a fault.

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Faure,

Fabbri,

Ferrière

et al. 2024

Comptes Rendus. Géoscience

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40 Ar/ 39 Ar geochronology of crustal deformation

Cited by 3 publications

References 144 publications

40Ar/39Ar Age of Phengite from Sandstone of the Ophiolite-Derived Clastic Sequence of the Basin of the Rassokha River, Collision Belt of the Chersky Range

40Ar/39Ar Age of Phengite from Sandstone of the Ophiolite-Derived Clastic Sequence of the Basin of the Rassokha River, Collision Belt of the Chersky Range

Evolution of fluid redox in a fault zone of the Pic de Port Vieux thrust in the Pyrenees Axial Zone (Spain)

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