3D drillhole database of the Purcell Anticlinorium, British Columbia

Schetselaar, Ernst; deKemp, E A; Ransom, P W; Buenviaje, R; Nguyen, Kim Thuy; Montsion, R; Joseph, J

doi:10.4095/297050

Cited by 3 publications

(5 citation statements)

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“…with more than 1000 lithostratigraphic markers (Schetselaar et al, 2015), subsurface data from the Sullivan Mine (more than 4000 drillhole logs; for details, see Montsion et al, 2015), and surface-mapped contacts as well as more than 11,000 surface structural measurements, including bedding and foliation (for details, see Joseph et al, 2011aJoseph et al, , 2011b. In addition, all 2D seismic profiles acquired from previous projects (Cook and Van der Velden, 1995) and 2D potential field forward models (Thomas et al, 2013) were imported into the 3D GIS database.…”

Section: Data Analysis/methodologymentioning

confidence: 99%

“…Building on a major synthesis volume of the Sullivan Mine (Lydon et al, 2000a) and regional geologic compilations including a 1:250,000 scale effort (Höy et al, 1995), a 2D GIS geoscience data compilation (nine Open File 1:50,000 scale geology maps covering NTS 82F01 , 02, 07, 08, 09, 10, 15, 16, 82G04, 05, 12, 13), (Brown et al, 2011;Joseph et al, 2011aJoseph et al, , 2011b, a reprocessed seismic compilation (Cook and Van der Velden, 1995), and using British Columbia TRIM Digital Elevation Model for vertical control, an initial 3D data set was developed for the Purcell Anticlinorium. This was supplemented with inclusion of identified markers and 3D path calculation from information contained in regional legacy drillhole logs (for details, see Schetselaar et al, 2015). From the integration of this extensive data set and some follow-up field workin 2011 and 2012, a 3D structural and stratigraphic regional model of the southern Purcell Anticlinorium was developed (Figures 1 and 2).…”

Section: Objective and Scopementioning

confidence: 99%

“…The 3D regional Purcell model and supporting geoscience data presented herein are currently in GOCAD/ SKUA 2014.1 software from Paradigm. The Lower-Middle Aldridge stratigraphic contact (LMC) horizon depth and structural contours are downloadable from the GSC GEOSCAN site de , as Open File OF7903 (includes exported DXF, GOCAD ASCII, SHAPE format files Leapfrog 3D viewer with 3D scene) and OF7838, which describes more project details of the drill core database (Schetselaar et al, 2015) and algorithm development (Hillier et al, 2014(Hillier et al, , 2015. The stratigraphic marker points, structural observations, faults, younger Purcell Supergroup stratigraphy above the Aldridge Formation, the digital elevation model (DEM), and all geophysical data used in the interpretation are available as a GOCAD/ SKUA project with exported files and a 3D geodatabase in ArcGIS also to be made available from the GEOSCAN site or by contacting the main author.…”

Section: Objective and Scopementioning

confidence: 99%

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Assessing the workflow for regional-scale 3D geologic modeling: An example from the Sullivan time horizon, Purcell Anticlinorium East Kootenay region, southeastern British Columbia

et al. 2016

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We have developed a regional-scale 3D geologic model, highlighting the Mesoproterozoic Sullivan time horizon (approximately 1470 Ma) throughout the Purcell Anticlinorium in the East Kootenay region. This 3D geospatial model of the region is constrained with an extensive surface and subsurface database of stratigraphic, structural, and geophysical observations distributed throughout the study area. This modeling exercise was conducted over a four-year period from 2011 to 2015 in which several iterations of the model were produced. The final model includes what is locally referred to as the Lower-Middle Aldridge stratigraphic contact (LMC), a map unit at the very top of the lower Aldridge Formation where the Sullivan world-class Pb-Zn-Ag deposit is located. Local mineral exploration initiatives focus on this key exploration target horizon, which is now modeled in 3D. The regional LMC model provides a much needed geospatial reference used to characterize and understand sedimentary exhalative, a type of ore deposit (SEDEX) ore systems as well as a key 3D exploration target. Developing regional 3D geologic models for orogenic interiors such as the Purcell region, and older shield regions is a challenge. This is largely due to data sparsity at depth, lack of standards for 3D data collection, storage, integration, and interpretation practice. Current algorithms use only a partial set of available observational or knowledge constraints and exist in workflows that do not allow for complicated geologic event histories. We have mitigated some of these challenges with a new implicit algorithm (SURFE), applied in this Purcell case study, to estimate major regional faults and horizons through variably distributed and clustered data. These modeled geologic elements are then fed into the SKUA structural and stratigraphic workflow to produce the volumetric model. Reflection on the general 3D modeling workflow for these regional situations highlights the need for embedding more knowledge constraints into the process.

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Section: Data Analysis/methodologymentioning

confidence: 99%

Section: Objective and Scopementioning

confidence: 99%

Section: Objective and Scopementioning

confidence: 99%

See 1 more Smart Citation

Assessing the workflow for regional-scale 3D geologic modeling: An example from the Sullivan time horizon, Purcell Anticlinorium East Kootenay region, southeastern British Columbia

et al. 2016

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“…In recent years, 3D geological modelling has become an increasingly prominent tool in exploration geology. Originally developed for hydrocarbon reservoir modelling in basins, new advances in geological software have made 3D modelling a powerful tool in enhancing our understanding of more complicated geological environments (Schetselaar, 2015). In complex hard rock areas like the RoF, 3D modelling of intrusive bodies can be difficult due to their intricate topologies and variable shapes that are typically poorly constrained at depth by exploration drilling (de Kemp et al, 2016).…”

Section: Background On 3d Modelling Methodsmentioning

confidence: 99%

“…Physical rock property data such as 6) assays and 7) magnetic susceptibility data are organized in tables of the same name. The grouping of drill log records into thematic tables is critical for the identification and hole-to-hole correlation of lithostratigraphic markers at the regional scale (Schetselaar et al, 2015). With the exception of lithostratigraphy, records belonging to these tables are relationally linked to the 'Collars' table by their drillhole identifier 'HoleID' using many-to-one relationships (Fig.…”

Section: Database Designmentioning

confidence: 99%

3D Geological Modeling of the Double Eagle – Black Thor Intrusive Complexes, McFaulds Lake Greenstone Belt, Ontario, Canada

Laudadio¹

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The Ring of Fire region in northwestern Ontario hosts many valuable magmatic ore deposits, including six major chromite and one significant Ni-Cu-(PGE) deposit. A 3D geological model was developed to examine the subsurface architecture and structural disposition of the Double Eagle and Black Thor intrusive complexes that host these deposits. The model is constrained by diamond drillhole datasets, regional geological maps and a refined structural interpretation based on high-resolution magnetic data. Employing implicit and explicit modelling methods, a 3D representation of the intrusive complexes was generated by fitting triangulated surfaces to relevant drillhole constraints. Through the examination of the spatial relationships between the main shear zones and the intrusive units of the DEIC and BTIC, the primary and post-ore deformation geometries of the complexes were evaluated, increasing our understanding of the magmatic plumbing system and supporting the interpretation of a single, connected ultramafic complex dissected and transposed by ductile deformation.

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Magnetic models of the Moyie anticline, Purcell anticlinorium, southeastern Canadian Cordillera

Thomas

2015

Can. J. Earth Sci.

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Two-dimensional magnetic models of the Moyie anticline contribute to an independent project targeting development of a regional three-dimensional (3D) model of much of the Purcell anticlinorium by compensating for shortcomings in reflection seismic signatures and distributions of drill holes and surface structural data. Modelling has focused on prominent anomalies related to relatively strong magnetizations within the Creston Formation and Moyie sills. Models of the western flank of the anticline indicate the Creston Formation forms the bulk of a westward-thickening, wedge-shaped sedimentary package whose west-dipping layers are truncated by a steeply west-dipping Moyie fault, truncating also Moyie sills on the opposite side. Near-surface dips of the fault range from 54°to 87°. Stratigraphic comparisons across the fault indicate minimum reverse dip displacements ranging from 5.6 to 8.5 km. The eastern flank of the Moyie anticline is modelled consistently as a monoclinal, eastward-dipping stratigraphic package comprising mainly Lower Aldridge Formation (with intruded Moyie sills) through Kitchener Formation, in general accord with geological models. One magnetic model, however, shows stratigraphy disrupted by shallow thrust faults, above which a series of near-vertical blocks is modelled. The Yahk River syncline is modelled as a symmetrical fold having an axial depth of 4.2 km to the top of the Upper Aldridge Formation. Collectively, the models outline a broad domal pattern of Moyie sills in the core of the anticline to 12 km depth, supporting a proposal that a gravity high correlating with the Moyie anticline relates to high-density Moyie sills at relatively shallow depths, rather than deeper highdensity basement.

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3D drillhole database of the Purcell Anticlinorium, British Columbia

Cited by 3 publications

References 0 publications

Assessing the workflow for regional-scale 3D geologic modeling: An example from the Sullivan time horizon, Purcell Anticlinorium East Kootenay region, southeastern British Columbia

Assessing the workflow for regional-scale 3D geologic modeling: An example from the Sullivan time horizon, Purcell Anticlinorium East Kootenay region, southeastern British Columbia

3D Geological Modeling of the Double Eagle – Black Thor Intrusive Complexes, McFaulds Lake Greenstone Belt, Ontario, Canada

Magnetic models of the Moyie anticline, Purcell anticlinorium, southeastern Canadian Cordillera

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