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Potential Field Interpretation of the Capricorn Orogen

Potential Field Interpretation of the Capricorn Orogen. JAMES GOODWIN. Worms, forward modelling and 3D inversion. Purpose. Investigate regional-scale crustal architecture Relationship between Pilbara/Capricorn/Yilgarn Compare with seismic line interpretation. Interpretation Techniques.

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Potential Field Interpretation of the Capricorn Orogen

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  1. Potential Field Interpretation of the Capricorn Orogen JAMES GOODWIN Worms, forward modelling and 3D inversion

  2. Purpose • Investigate regional-scale crustal architecture • Relationship between Pilbara/Capricorn/Yilgarn • Compare with seismic line interpretation Interpretation Techniques • Image processing • Multiscale edge detection (worms) • Forward modelling • 3D inversion (unconstrained)

  3. Seismic line 10GA-CP1 Surface Geology Magnetics RTP Hamersley Hamersley Ashburton Nanjilgardy Fault Hamersley

  4. Seismic line 10GA-CP1 • Leake Springs Metamorphics = correlative of Upper Wyloo Group (Cawood and Tyler 2004; Sheppard et al., 2007) Hamersley Group Leake Springs Metamorphics Ashburton Fm Edmund Group Collier

  5. Seismic line 10GA-CP1 Bouguer Gravity Gravity Worms Magnetics Worms Hamersley Hamersley Karra Well Fault (SW dipping) Ashburton Baring Downs Fault Hamersley

  6. 0 mGals S N GRAVITY -100 mGals Hamersley 1000 nT 3.2 / 0.10 MAGNETICS RTP -1000 nT 0 2.8 2.67 UWG 2.6 2.9 2.6 LWG 2.6 Fortescue Group 2.8 2.7 2.7 Granite-Greenstone 2.7 Baring Downs Fault Bandee 2.8 2.9 Lower Crust Depth (km) 30 2.9 2.9 Mantle Hamersley Group 3.2 Off line effects 60 MAGNETIC INVERSION GRAVITY INVERSION

  7. Seismic line 10GA-CP2 Surface Geology Gravity Worms Magnetics Worms Magnetics RTP Bouguer Gravity Edmund Group Lyons River Fault Collier ? contact Moorarie Supersuite Durlacher Supersuite Leake Springs Metamorphics Durlacher Supersuite Cardilya Fault Moogie Metamorphics

  8. S GRAVITY N -10 mGals Leake Springs Metamorphics -50 mGals MAGNETICS RTP 2.7 / 0.05 Edmund Group 500 nT 2.6 -500 nT Durlarcher Moorarie 2.6 2.67 2.67 2.6 2.6 2.85 UWG 2.9 2.8 Glenburgh Terrane 2.77 2.8 Lyons River Fault 2.8 / 0.02 LWG Bandee Seismic Province 2.9 2.9 2.9 Mantle 3.2 MAGNETIC INVERSION Edmund Group Lyons River Fault Glenburgh Terrane Bandee Seismic Province GRAVITY INVERSION

  9. Seismic line 10GA-CP3 Gravity Worms Magnetics RTP Magnetics Worms Surface Geology Bouguer Gravity Dalgaringa Supersuite Errabiddy Shear Zone Narryer Terrane

  10. Seismic line 10GA-CP3 10GA-CP3 BIF 74257

  11. Seismic line 10GA-CP3

  12. MAGNETIC INVERSION Narryer Terrane Glenburgh Terrane GRAVITY INVERSION Errabiddy Shear Zone

  13. Key Findings • Forward models suggest the seismic line interpretation is consistent with potential field data. • Hamersley Group has the potential to extend as far south as the Edmund Basin • Magnetic anomalies attributed mainly to the Hamersley Group, Leake Springs Metamorphics and BIF 74257 • Yilgarn-Capricorn boundary is south-dipping

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