structural methods
DESCRIPTION
Métodos Estructurales en ExploraciónTRANSCRIPT
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Structural methodsin explorationCollection of orientation data
Analysis methodsStructural orientation dataStructural patterns map, x-sectionFault-vein longitudinal sectionsDrill targeting - ore zones, ore shoots
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Collection of orientation data bedding/contact strike/dip fault strike/dip slickenline rake shear sense vein strike/dip fold fold axis fold axial plane (cleavage) fold asymmetry, vergence dike strike/dip flow foliation shear sense
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Collection of orientation dataBasement structure important: test for structural controls Volcanic structuresFlow layering test for flow dome geometry, concentric/radialBedding/volc. layering test for block rotations, inference of listric normal faults, intrusive centersDikes test for intrusive center, extension directionFault and fault-vein dataStrike/dip, slickenline rake, shear sense, fill paragenesis test for kinematic control on ore shoot
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Analysis of structural dataSlickenline histogram test for dominant structural regime
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Quellopata
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Statistical analysis determine average orientation of fabric elements or setsIdaho Springs district, Colorado
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Statistical analysis determine average orientation of fabric elements or setsIdaho Springs district, Coloradofoliationveins
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Paleo-stress modeling determine extension directionM-plane analysisFaultkin analysis
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M-plane analysisT-fractures = most favorable opening = s1 s2 plane
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Ejemplo de anlisis cinemtica, Veta Baja, Arcata mine, Peru
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EjercicioPaleo-stress modelingVeta Baja data: MHC geos: M-plane method Compile all data (Nelson Faultkin)Tres Reyes dataVeta Baja dataCompile:
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Structural pattern recognitionMap and cross section patterns but 3-DPatterns:ConjugateOrthorhombicEn echelonjog, bend (cymoid loop)
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en echelon, jog, bend
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Cerro Blanco, Chile
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Intersection model
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Fault-vein longitudinal sectionsProject x, y, z mine data to longitudinal sectionContour:Ore gradeVein thicknessStrikeDipMetal ratios, geochemistry
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Long Sections
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Dip - Grade
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Strike - GradeN
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Drill targeting - Designore zones, ore shoots
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Other Models
Ore shoot = cutoff lineSlickenlines ^ ore shoot 90Ore shoot = fault Riedel intersection
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Ore shoot = cutoff line
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Slickenlines ^ ore shoot 90
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Ore shoot = fault Riedel intersectionOblique slip
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EjercicioDrill hole designVeta Baja data: slickenline model
Veta Tres Reyes data: fault jog model(need data from all MHC geos)
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WHAT ARE THE EQUATIONS ??