期刊
JOURNAL OF STRUCTURAL GEOLOGY
卷 22, 期 8, 页码 1065-1086出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0191-8141(00)00029-8
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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 lambda(v) greater than or equal to 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, mu m- 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. (C) 2000 Elsevier Science Ltd. All rights reserved.
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