Contribution of Studies of Sub-Seismic Fracture Populations to Paleo-Hydrological Reconstructions (Bighorn Basin, USA)

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• 作者：Nicolas Beaudoin^a ; ^b ; ^{Nicolas.Beaudoin@upmc.fr} ; Olivier Lacombe^a ; ^b ; Nicolas Bellahsen^a ; ^b ; Laurent Emmanuel^a ; ^b
• 关键词：Fluid system evolution ; Paleo-hydrological reconstruction ; Diffuse fracture network
• 刊名：Procedia Earth and Planetary Science
• 出版年：2013
• 出版时间：2013
• 年：2013
• 卷：7
• 期：Complete
• 页码：57-60
• 全文大小：689 K

文摘

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.