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- W2084300568 abstract "At Panasqueira, Portugal, exceptional exposure and demonstrable vein connectivity allow robust characterisation of brittle/elastic failure mechanisms in intrusive-related environments. Extensional failure was driven by cycles of fluid injection (hydraulic valving) and vein growth under conditions with λv≥1 and differential stress <4T. Failure was episodic and produced a swarm of W–Sn-bearing quartz veins characterised by positive volumetric strain. Worked veins consist of families of co-planar vein-lobes linked at branch-points. Geometrically coherent vein displacements constrain an elliptical anomaly (the damage zone) in which values of extensional strain are symmetrically distributed, decreasing systematically away from a centrally located maxima to zero at a tip-line loop. Vein textures indicate rapid, episodic, vein opening, μm- to dm-scale vein apertures, spatially and temporally variable rates of vein filling and periodic baffling of fluid migration pathways. Although the vein swarm represents a single vein cluster, vein thickness and spacing populations are typically non-power law and define anomaly-scale heterogeneous strain with inhomogeneously deformed marginal zones surrounding a homogeneously deformed high-strain core. Deviations from power-law behaviour were promoted by competitive vein growth that provided mechanisms for (i) inhibiting vein nucleation and (ii) localising deformation onto a few evenly spaced veins." @default.
- W2084300568 created "2016-06-24" @default.
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- W2084300568 date "2000-08-01" @default.
- W2084300568 modified "2023-09-27" @default.
- W2084300568 title "Extensional failure and hydraulic valving at Minas da Panasqueira, Portugal: evidence from vein spatial distributions, displacements and geometries" @default.
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- W2084300568 doi "https://doi.org/10.1016/s0191-8141(00)00029-8" @default.
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