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Hydrothermal systems in distal rifted margins and their role in the thermal evolution of sedimentary successions. Study of two fossil analogues in the Swiss Alps and Pyrenees

Abstract : Seismic and drill hole data from deep-water distal rifted margins allow to understand the architecture and evolution of these yet little investigated domain. Nonetheless, the thermal evolution is poorly constrained even if hydrothermal systems play a key role in determining the heat fluxes. This Thesis aims to investigate breccias, cements, veins and replacement minerals within the pre- to post-rift sediments that could testify the space-time evolution of rock-fluid interactions. Two fossil analogues are studied: the Adriatic distal margin and the Pyrenean hyper-extended system. Field, petrography and geochemical analyses reveal a strong heterogeneity in the composition of the fluids as well as their hydrothermal features. Two main types of fluids occur: carbonate-rich fluids refer to early rifting phases dominated by high-angle normal faults; silica-rich fluids are related to the last rifting stages characterized by low-angle detachment faults exhuming upper crust and mantle-related rocks. The results of this Thesis highlight how specific changes in the chemistry of the fluid system are intimately linked to the tectonic evolution of rifted margins.
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Contributor : Nicolo Incerpi <>
Submitted on : Friday, July 13, 2018 - 2:38:42 PM
Last modification on : Friday, January 31, 2020 - 1:34:02 PM
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Nicolo Incerpi. Hydrothermal systems in distal rifted margins and their role in the thermal evolution of sedimentary successions. Study of two fossil analogues in the Swiss Alps and Pyrenees. Stratigraphy. Universita degli Studi di Torino; Université de Strasbourg, 2017. English. ⟨tel-01838600⟩

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