Philosophy & Photogeological Case Histories · Philosophy & Photogeological Case Histories ......
Transcript of Philosophy & Photogeological Case Histories · Philosophy & Photogeological Case Histories ......
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AIG March 10, 2014 remote sensing conference
Philosophy & Photogeological Case
Histories
Nick Lockett &
Associates Pty Ltd
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Orapa 2125 A/K1 pipe vegetation anomaly
Source: Botswana Government, Manfred Marx, Rough Diamond Review
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W.A. lateritic weathering terrain: Generalised regolith & geochemical profiles
After Lithofire 2002
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Relationship between land form & regolith in arid regions of the Yilgarn Craton
Modified after Anand 2002
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Schematic geological setting of primary and secondary diamond deposits in the Kasai Craton,Angola and DRC.
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Glacial Dispersion of Kimberlite Indicator Minerals
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Schematic diagram of typical landforms associated with continental glaciation
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Enlarged Portion of Northern Quebec Black & White Air Photo
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Guelb er Richat Dome, Taoudeni Basin, Mauritania
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Central African Project Area Landsat 7 + ETM Image
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Erosional landform expression of surface & sub-surface geology
From Miller, 1961, “Photogeology”
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SRTM DEM
90m cellsize (30m over USA,
Australia)
Derived from Shuttle Topographic
Radar Mapping Mission
Available from 50 deg North to 50 deg
South
Not edited (preliminary only)
Holes around water bodies and in
radar shadows
Noise in “flat areas”
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Stereoscope
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Photogeology mapping flow sheet
Surface geology map
Stage 1. Image interpretation
IMAGE INTERPRETATION BASE DATASET PRODUCT
i) Published geology, proprietary outcrop
and regolith mapping, drill hole regolith and bedrock geology
Bedrock geology and regolith framework
ii) Stereo imagery
Bedrock outcrops, fractures, foliation, selected litho
contacts, regolith/landform units (e.g. breakaways), drainage channels, dunes, culture
iii) Landsat 7 B,G,R=4/2, 4/7,5/7 Saprock, ferricrete, backslope ferricrete,
bedrock litho units, saprolite, sand cover,
sheetwash, alluvium
iv) K,U,Th, ternary radiometrics Ferricrete, backslope ferricrete, sand/alluvium,
granitoids
v) Aeromagnetics Pisolithic ferricrete, subsurface bedrock geology and structure
vi) Reconnaissance field check Ground truthing and map verification
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Colour air photo 1:25,000
1 kilometre
channel
saprock
road
breakaway (unconformity)
Foliation trend
Pallid/mottled zone
ferricrete
bif
calcrete/hardpan
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Landsat TM: B,G,R, as bands 2,4,7
1 kilometre
backslope
bedrock outcrop
ferricrete
channel Saprolite/ saprock
bif
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backslope ferricrete
Ironstone ferruginous
and saprolite
fresh outcrop
haematite-maghemite 1 kilometre
channel
goethite
bif
ferruginous bedrock
Landsat TM: B,G,R, = 4/2,4/7,5/7
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Thorium radiometrics: pseudocolour image
1 kilometre
channel
ferricrete
ferruginous bedrock
breakaway
backslope
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Final Geology Interpretation
1 kilometre
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DTM with geology drape
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Botswana Published Geology
Botswana
Published
1:125,000
Geology
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Published Geology
Surface Geology Interpretation
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Geology Drape
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Geology Perspective
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Botswana Solid Geology and Magnetics 1vd
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Merlin Area, Northern Territory, Regolith and Structure Mapping;
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Enlarged Portion of 1:50,000 Colour Air Photo NTc Limmen Gate, Run 27, Frame 119, Acquired 14-9-1995
Air Photo Supplied by NT Dept Lands & Environment
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Portion of Merged LANDSAT TM/SPOT Image Covering Merlin Project
Imagery Acquired & Processed by Geoimage Pty Ltd
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Merlin Area Photogeological
Map
Produced from 1:10,000 Colour Air
Photos and Field Mapping
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Evolution of Landscape
Showing Inversion of Topography on the Merlin Plateau
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Portion of 1:50,000 Merlin Regional Photogeology
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Pull-apart Basin Model & Riedel Shear Diagram
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Conclusion
DEMS & satellite imagery available from a variety of
sources. (90m DEM globally available)
Resolution range 90m to 0.5m – It’s important to
pick the right resolution and scale for your project
Satellite imagery can be draped over DEM for
stereoscopic viewing and interpretation
Accurately georeferenced topographic &
photogeological interpretive maps can be produced
to order for anywhere in the world
Satellite imagery, DEMs and derived products ideal
for planning and compiling results of field
programs
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