Airborne Survey of the Twillick Brook Area
G.J. Kilfoil
St. John’s, Newfoundland, March, 2020
Open File NFLD/3383 comprises results from a recent high-resolution airborne magnetic gradiometer, radiometric and VLF-EM survey of the Twillick Brook area, south-central Newfoundland. This Open File consists of 13 maps for NTS map area 002D/04 and limited parts of surrounding map areas. Results are presented as full-colour maps in pdf format (1:75 000 scale).
Magnetic Maps
- Map 2020-01 Residual Magnetic Intensity (30 MB)
- Map 2020-02 First Vertical Derivative of the Magnetic Field (35 MB)
Radiometric Maps
- Map 2020-03 Percent Potassium (47 MB)
- Map 2020-04 Equivalent Uranium (50 MB)
- Map 2020-05 Equivalent Thorium (47 MB)
- Map 2020-06 Ratio of Equivalent Thorium to Percent Potassium (40 MB)
- Map 2020-07 Ratio of Equivalent Uranium to Percent Potassium (40 MB)
- Map 2020-08 Ratio of Equivalent Uranium to Equivalent Thorium (40 MB)
- Map 2020-09 Natural Air Absorbed Dose Rate (45 MB)
- Map 2020-10 Ternary Radioelement Image (32 MB)
VLF-EM Maps
- Map 2020-11 VLF-EM Total Field – 25.2 kHz (39 MB)
- Map 2020-12 VLF-EM Total Field – 23.4 and 22.1 kHz (35 MB)
- Map 2020-13 VLF-EM Quadrature – 25.2, 23.4 and 22.1 kHz (40 MB)
Additional data will be available from the Geological Survey Division’s online Geoscience Atlas: Metadata Link
- Airborne survey profile data
- Interpolated grids
- GIS layers and map images
- The contractor’s logistics and data processing report