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- W3129337930 abstract "<p>We present preliminary results on the meso- and micro-structural evolution of high-strain rocks of the Houill&#232;re Zone and Pierre-Avoi Unit outcropping along the Swiss-Italy boundary ridge, to the west of the Grand Saint Bernard Pass.</p><p>The stack of Middle and External Pennidic units is folded by polyphasic folds, developed at least partly under low-grade metamorphic conditions. Different generations of folds show isoclinal to open geometries. Fold axes are subhorizontal, trending NE-SW, and the overall fold interference pattern can be generally classified as a type 3 (Ramsay). At the microscale, an important deformation mechanism is pressure solution cleavage, consistent with relatively low-temperature conditions.</p><p>Brittle-ductile shear zones, characterized by anastomosing bands of very fine-grained fault rocks, with pressure solution seams and SCC&#8217; shear bands, exploit the weak and strongly anisotropic phyllosilicate-rich layers, particularly in the black schists of the Houill&#232;re Zone.</p><p>Brittle high-angle faults crosscut ductile and semi-brittle features and show an oblique-normal kinematics. These faults are particularly well developed in the more competent rocks of the Pierre-Avoi Unit (e.g. massive carbonates, metaconglomerates and metasandstones).</p><p>A continuous horizon, a few metres thick, with a high density of quartz veins, can be followed in the internal and upper part of the Houill&#232;re Zone. This horizon is folded, at least by the younger open folds, and constitutes a major marker to study the large-scale structure of this unit.</p>" @default.
- W3129337930 created "2021-03-01" @default.
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- W3129337930 date "2020-03-23" @default.
- W3129337930 modified "2023-09-26" @default.
- W3129337930 title "Meso- and micro-structural analysis of the Briançonnais Front in the Grand Saint Bernard area (Aosta Valley - Italy, and Valais - Switzerland)" @default.
- W3129337930 doi "https://doi.org/10.5194/egusphere-egu2020-22548" @default.
- W3129337930 hasPublicationYear "2020" @default.
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