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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

Potential Field Interpretation of the Capricorn Orogen

JAMES GOODWIN

Worms, forward modelling and 3D inversion

purpose
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)
seismic line 10ga cp1
Seismic line 10GA-CP1

Surface Geology

Magnetics RTP

Hamersley

Hamersley

Ashburton

Nanjilgardy Fault

Hamersley

seismic line 10ga cp11
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

slide5

Seismic line 10GA-CP1

Bouguer Gravity

Gravity Worms

Magnetics Worms

Hamersley

Hamersley

Karra Well Fault

(SW dipping)

Ashburton

Baring Downs Fault

Hamersley

slide6

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

seismic line 10ga cp2
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

slide8

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

seismic line 10ga cp3
Seismic line 10GA-CP3

Gravity Worms

Magnetics RTP

Magnetics Worms

Surface Geology

Bouguer Gravity

Dalgaringa Supersuite

Errabiddy Shear Zone

Narryer Terrane

slide10

Seismic line 10GA-CP3

10GA-CP3

BIF 74257

slide12

MAGNETIC INVERSION

Narryer Terrane

Glenburgh Terrane

GRAVITY INVERSION

Errabiddy Shear Zone

key findings
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