4-dimensional modelling of mineral belts
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1 Pietari Skyttä, Tobias Bauer, Saman Tavakoli, P är Weihed, Rodney Allen, M ahdieh Dehghannejad, Maria Garcia Juanatey, Juliane Hübert Bergforsk 05 May dimensional modelling of mineral belts
2 Why 3D-modelling? Earth s crust and ore deposits are 3D! Proper integration of three-dimensional source data Surface geology Geophysics (seismic, potential field IP, resistivity) Drillings Mine data
3 Why 4D-modelling? Much of the near-surface deposits already discovered and exploited deep-exploration required = expensive Complex geological terrains and uneven source data Distribution, type and reliability remaining uncertainties in the 3Dmodels
4 What do we get from 4D-modelling? Validation of the 3D-interpretations Improvements in understanding geological processes leading to ore deposition and their subsequent deformation = distribution and form of the deposits
5 Background Two currently running projects Vinnova 4D-modelling of the Skellefte District Luleå and Uppsala Universities, Boliden Mineral AB, GeoVista AB National funding ProMine EU-funding VINNOVA -Multidisciplinary -Geology, Geophysics ProMine - Several Mineral Belts through Europe involved Financial support from Boliden Mineral AB, VINNOVA and EU acknowledged!
6 Much of the work so far concentrated in structural analysis & synthesis Now the focus changing towards 3/4D-modelling gocad (Paradigm) MOVE (Midland Valley Exploration)
7 Aim of the talk Provide an overview of the possibilities and challenges of 3/4D-modelling within the Skellefte District Two geographical focus areas and three modelling scales Case 1 - Regional-scale animations Case 2 - Semi-regional scale with good surface geology constraints Case 3 -Local-scale with input data from drilling and mine geology
8 Case 1: Simplified crustal evolution models Goals A regional 3D context for activities in the district Aid in understanding large-scale tectonic processes Visualizations & presentations for decision-makers Teaching material Input Concept: Inversion tectonics in a segmented crust Geophysical and geological constraints acquired in the smallerscale sub-projects
9 Case 1: Simplified crustal evolution models Challenges Complexity a suitable degree of simplification needed Correct conceptual model (may though hopefully evolve further) Advantages Possibility to present the sometimes so-hard-to-understand geological stories in an easier way
10 Case 2: Semi-regional scale model with good surface geology constraints Goals Understanding the structural control on sedimentation, volcanism and mineralization + subsequent deformation patterns Input into district-scale models Input Geological mapping, structural analysis IP, resistivity and potential field modelling
11 Case 2: Semi-regional scale model with good surface geology constraints Challenges Complex interplay between sedimentation and deformation Correlation with the larger-scale seismics Advantages Good exposure and relatively low strain possible to define a schematic framework for the whole Skellefte District
12 Exploring the surface geology
13 Case 3: Local-scale with input data from drilling and mine geology Goals Deposit/domain-scale 3D-framework for mineralizations by improved understanding on the structural evolution of the mine areas, e.g. the Kristineberg mine Fault-system geometry, kinematics and strain partitioning Input into district-scale models Input Drill core observations, triangulated ore body surfaces in 3D, profiles and plan maps from the mine Geological mapping, structural analysis Seismics, magnetotellurics
14 Case 3: Local-scale with input data from drilling and mine geology Challenges Advantages Few if any marker horizons due to extensive ore-related alteration systems Complex ore transposition pattern Dense drillings for constraints about 3D-geometry
15 Kristineberg on map Sedimentvolcanic contact Kristineberg mine
16 The Kristineberg ore deposit Long-section, view towards E Cross-section view towards N
17 Source data
18 Volcanics top-contact Kristineberg Ore lenses Rävlidmyran ore Lineation vectors Rävliden ore Faults Kristineberg intrusion contac A 3D-sketch of the same - view towards NE
19 Outcomes MODELLING 1) Feedback between the models in different scales and with different types of source data 2) Possibilities in defining deform ation styles >> better interpretations on geometry and dynamics 3) Difficulties in quantifying deformation
20 Thank you!
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