Philosophy & Photogeological Case Histories · Philosophy & Photogeological Case Histories...

AIG March 10, 2014 remote sensing conference

Philosophy & Photogeological Case

Histories

Nick Lockett &

Associates Pty Ltd

Orapa 2125 A/K1 pipe vegetation anomaly

Source: Botswana Government, Manfred Marx, Rough Diamond Review

W.A. lateritic weathering terrain: Generalised regolith & geochemical profiles

After Lithofire 2002

Relationship between land form & regolith in arid regions of the Yilgarn Craton

Modified after Anand 2002

Schematic geological setting of primary and secondary diamond deposits in the Kasai Craton,Angola and DRC.

Glacial Dispersion of Kimberlite Indicator Minerals

Schematic diagram of typical landforms associated with continental glaciation

Enlarged Portion of Northern Quebec Black & White Air Photo

Guelb er Richat Dome, Taoudeni Basin, Mauritania

Central African Project Area Landsat 7 + ETM Image

Erosional landform expression of surface & sub-surface geology

From Miller, 1961, “Photogeology”

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”

Stereoscope

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

Colour air photo 1:25,000

1 kilometre

channel

saprock

road

breakaway (unconformity)

Foliation trend

Pallid/mottled zone

ferricrete

bif

calcrete/hardpan

Landsat TM: B,G,R, as bands 2,4,7

1 kilometre

backslope

bedrock outcrop

ferricrete

channel Saprolite/ saprock

bif

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

Thorium radiometrics: pseudocolour image

1 kilometre

channel

ferricrete

ferruginous bedrock

breakaway

backslope

Final Geology Interpretation

1 kilometre

DTM with geology drape

Botswana Published Geology

Botswana

Published

1:125,000

Geology

Published Geology

Surface Geology Interpretation

Geology Drape

Geology Perspective

Botswana Solid Geology and Magnetics 1vd

Merlin Area, Northern Territory, Regolith and Structure Mapping;

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

Portion of Merged LANDSAT TM/SPOT Image Covering Merlin Project

Imagery Acquired & Processed by Geoimage Pty Ltd

Merlin Area Photogeological

Map

Produced from 1:10,000 Colour Air

Photos and Field Mapping

Evolution of Landscape

Showing Inversion of Topography on the Merlin Plateau

Portion of 1:50,000 Merlin Regional Photogeology

Pull-apart Basin Model & Riedel Shear Diagram

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