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Beaudoin, Nicolas; Lacombe, Olivier; Bellahsen, Nicolas; Emmanuel, Laurent (2013)
Publisher: Elsevier
Journal: Procedia Earth and Planetary Science
Languages: English
Types: Article
Subjects: Earth and Planetary Sciences(all)
This work reports on the reconstruction of the paleo-hydrological history of the Bighorn Basin (Wyoming, USA) and illustrates the advantages and drawbacks of using sub-seismic diffuse fracture populations (i.e., micrometric to metric joints and veins forming heterogeneous networks), rather than fault zones, to characterize paleo-fluid systems at both fold and basin scales. Because sub-seismic fractures reliably record the successive steps of deformation of folded rocks, the analysis of the geochemical signatures of fluids that precipitated in these fractures reveals the paleo-fluid history not only during, but also before and after, folding. The present study also points out the need for considering pre-existing fluid systems and basin-scale fluid migrations to reliably constrain the evolution of fluid systems in individual folds.
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    • [1] Evans MA, Fischer MP. On the distribution of fluids in folds: A review of controlling factors and processes. Journal of Structural Geology 2012 ; 44: 2-24 .
    • [2] Barbier M, LeprĂȘtre R, Callot JP, Gasparrini M, Daniel JM, Hamon Y, Lacombe O, Floquet M. Impact of fracture stratigraphy on the paleo-hydrogeology of the Madison Limestone in two basement-involved folds in the bighorn basin, (Wyoming, USA). Tectonophysics 2012; 576-577: 116-132.
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    • [6] Beaudoin N, Bellahsen N, Lacombe O, Emmanuel L. Fracture-controlled paleohydrogeology in a basement-cored, fault-related fold: Sheep Mountain anticline (Wyoming, USA). Geoch Geophys Geosyst 2011; 12: Q06011.
    • [7] Beaudoin N, Bellahsen N, Lacombe O, Emmanuel L, Pironon J. Crustal-scale squeegee fluid flow during the tectonic evolution of the Bighorn Basin (Wyoming, USA). Basin Research, in revision.
    • [8] Lacombe O. Calcite twins, a tool for tectonic studies in thrust belts and stable orogenic forelands. Oil and Gas Science and Technology 2010; 65(6): 809-838.
    • [9] Hilgers C, Urai JL. Microstructural observations on natural syntectonic fibrous veins: implications for the growth process. Tectonophysics 2002; 352 (3-4): 257-274.
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