Unlocking Australias Opal Wealth OPAL DOMES David Horton
![“Unlocking Australia’s Opal Wealth” OPAL DOMES David Horton 7 th National Opal Symposium Lightning “Unlocking Australia’s Opal Wealth” OPAL DOMES David Horton 7 th National Opal Symposium Lightning](https://slidetodoc.com/presentation_image_h2/68dde19913893f9c4c4d5d591bb947b9/image-1.jpg)
![AUSTRALIAN OPAL MINING CENTRES AUSTRALIAN OPAL MINING CENTRES](https://slidetodoc.com/presentation_image_h2/68dde19913893f9c4c4d5d591bb947b9/image-2.jpg)
![west east 120 Late Bulldog Shale ** Cadna-Owie Formation Griman Ck Formation ** Coreena west east 120 Late Bulldog Shale ** Cadna-Owie Formation Griman Ck Formation ** Coreena](https://slidetodoc.com/presentation_image_h2/68dde19913893f9c4c4d5d591bb947b9/image-3.jpg)
![Stage 2: Arid sub-tropical climate; lowering of alkaline water table during warping; remobilisation of Stage 2: Arid sub-tropical climate; lowering of alkaline water table during warping; remobilisation of](https://slidetodoc.com/presentation_image_h2/68dde19913893f9c4c4d5d591bb947b9/image-4.jpg)
![10 Ma - present Stage 3: Scarping Opal horizon 20 km Note: Vertical scale 10 Ma - present Stage 3: Scarping Opal horizon 20 km Note: Vertical scale](https://slidetodoc.com/presentation_image_h2/68dde19913893f9c4c4d5d591bb947b9/image-5.jpg)
![AUSTRALIAN SEDIMENTARY OPAL – WHY IS AUSTRALIA UNIQUE? Australian Gemmologist, 21, 287 -294 Published AUSTRALIAN SEDIMENTARY OPAL – WHY IS AUSTRALIA UNIQUE? Australian Gemmologist, 21, 287 -294 Published](https://slidetodoc.com/presentation_image_h2/68dde19913893f9c4c4d5d591bb947b9/image-6.jpg)
![Shuttle Radar Topography Mission Specially modified radar system that flew onboard the Space Shuttle Shuttle Radar Topography Mission Specially modified radar system that flew onboard the Space Shuttle](https://slidetodoc.com/presentation_image_h2/68dde19913893f9c4c4d5d591bb947b9/image-7.jpg)
![WINTON DOME Length: 90 km Width: 40 km WINTON DOME Length: 90 km Width: 40 km](https://slidetodoc.com/presentation_image_h2/68dde19913893f9c4c4d5d591bb947b9/image-8.jpg)
![JUNDAH DOME Length: 145 km Width: 70 km JUNDAH DOME Length: 145 km Width: 70 km](https://slidetodoc.com/presentation_image_h2/68dde19913893f9c4c4d5d591bb947b9/image-9.jpg)
![EROMANGA DOME Length: 145 km Width: 45 km EROMANGA DOME Length: 145 km Width: 45 km](https://slidetodoc.com/presentation_image_h2/68dde19913893f9c4c4d5d591bb947b9/image-10.jpg)
![GRAWIN - GLENGARRY DOME LIGHTNING RIDGE DOME Length: 30 km Width: 30 km Length: GRAWIN - GLENGARRY DOME LIGHTNING RIDGE DOME Length: 30 km Width: 30 km Length:](https://slidetodoc.com/presentation_image_h2/68dde19913893f9c4c4d5d591bb947b9/image-11.jpg)
![ANDAMOOKA ? DOME Length: ? ? km Width: 20 km ANDAMOOKA ? DOME Length: ? ? km Width: 20 km](https://slidetodoc.com/presentation_image_h2/68dde19913893f9c4c4d5d591bb947b9/image-12.jpg)
![COOBER PEDY ? DOME Length: 100 km Width: +40 km COOBER PEDY ? DOME Length: 100 km Width: +40 km](https://slidetodoc.com/presentation_image_h2/68dde19913893f9c4c4d5d591bb947b9/image-13.jpg)
- Slides: 13
![Unlocking Australias Opal Wealth OPAL DOMES David Horton 7 th National Opal Symposium Lightning “Unlocking Australia’s Opal Wealth” OPAL DOMES David Horton 7 th National Opal Symposium Lightning](https://slidetodoc.com/presentation_image_h2/68dde19913893f9c4c4d5d591bb947b9/image-1.jpg)
“Unlocking Australia’s Opal Wealth” OPAL DOMES David Horton 7 th National Opal Symposium Lightning Ridge 25 -27 July 2011
![AUSTRALIAN OPAL MINING CENTRES AUSTRALIAN OPAL MINING CENTRES](https://slidetodoc.com/presentation_image_h2/68dde19913893f9c4c4d5d591bb947b9/image-2.jpg)
AUSTRALIAN OPAL MINING CENTRES
![west east 120 Late Bulldog Shale CadnaOwie Formation Griman Ck Formation Coreena west east 120 Late Bulldog Shale ** Cadna-Owie Formation Griman Ck Formation ** Coreena](https://slidetodoc.com/presentation_image_h2/68dde19913893f9c4c4d5d591bb947b9/image-3.jpg)
west east 120 Late Bulldog Shale ** Cadna-Owie Formation Griman Ck Formation ** Coreena Member Surat Siltstone Doncaster Member ** Bungil Formation 130 ** These units host precious opal Schematic cross-section showing opal-bearing geological units Kumbarilla Beds 110 Mackunda Formation Allaru Mudstone Toolebuc Formation Wallumbilla Formation 100 Winton Formation ** Early 90 CRETACEOUS 80
![Stage 2 Arid subtropical climate lowering of alkaline water table during warping remobilisation of Stage 2: Arid sub-tropical climate; lowering of alkaline water table during warping; remobilisation of](https://slidetodoc.com/presentation_image_h2/68dde19913893f9c4c4d5d591bb947b9/image-4.jpg)
Stage 2: Arid sub-tropical climate; lowering of alkaline water table during warping; remobilisation of silcrete; opalisation 24 Ma 20 km Stage 1: Wet temperate to sub-tropical climate; high acidic water table; chemical weathering of sediments; pedogenic silcrete 60 Ma fresh host rocks later sediments chemically weathered host rocks opalisation silcrete
![10 Ma present Stage 3 Scarping Opal horizon 20 km Note Vertical scale 10 Ma - present Stage 3: Scarping Opal horizon 20 km Note: Vertical scale](https://slidetodoc.com/presentation_image_h2/68dde19913893f9c4c4d5d591bb947b9/image-5.jpg)
10 Ma - present Stage 3: Scarping Opal horizon 20 km Note: Vertical scale is highly exaggerated
![AUSTRALIAN SEDIMENTARY OPAL WHY IS AUSTRALIA UNIQUE Australian Gemmologist 21 287 294 Published AUSTRALIAN SEDIMENTARY OPAL – WHY IS AUSTRALIA UNIQUE? Australian Gemmologist, 21, 287 -294 Published](https://slidetodoc.com/presentation_image_h2/68dde19913893f9c4c4d5d591bb947b9/image-6.jpg)
AUSTRALIAN SEDIMENTARY OPAL – WHY IS AUSTRALIA UNIQUE? Australian Gemmologist, 21, 287 -294 Published December 2002
![Shuttle Radar Topography Mission Specially modified radar system that flew onboard the Space Shuttle Shuttle Radar Topography Mission Specially modified radar system that flew onboard the Space Shuttle](https://slidetodoc.com/presentation_image_h2/68dde19913893f9c4c4d5d591bb947b9/image-7.jpg)
Shuttle Radar Topography Mission Specially modified radar system that flew onboard the Space Shuttle Endeavour during an 11 -day mission in February 2000
![WINTON DOME Length 90 km Width 40 km WINTON DOME Length: 90 km Width: 40 km](https://slidetodoc.com/presentation_image_h2/68dde19913893f9c4c4d5d591bb947b9/image-8.jpg)
WINTON DOME Length: 90 km Width: 40 km
![JUNDAH DOME Length 145 km Width 70 km JUNDAH DOME Length: 145 km Width: 70 km](https://slidetodoc.com/presentation_image_h2/68dde19913893f9c4c4d5d591bb947b9/image-9.jpg)
JUNDAH DOME Length: 145 km Width: 70 km
![EROMANGA DOME Length 145 km Width 45 km EROMANGA DOME Length: 145 km Width: 45 km](https://slidetodoc.com/presentation_image_h2/68dde19913893f9c4c4d5d591bb947b9/image-10.jpg)
EROMANGA DOME Length: 145 km Width: 45 km
![GRAWIN GLENGARRY DOME LIGHTNING RIDGE DOME Length 30 km Width 30 km Length GRAWIN - GLENGARRY DOME LIGHTNING RIDGE DOME Length: 30 km Width: 30 km Length:](https://slidetodoc.com/presentation_image_h2/68dde19913893f9c4c4d5d591bb947b9/image-11.jpg)
GRAWIN - GLENGARRY DOME LIGHTNING RIDGE DOME Length: 30 km Width: 30 km Length: 45 km Width: 45 km
![ANDAMOOKA DOME Length km Width 20 km ANDAMOOKA ? DOME Length: ? ? km Width: 20 km](https://slidetodoc.com/presentation_image_h2/68dde19913893f9c4c4d5d591bb947b9/image-12.jpg)
ANDAMOOKA ? DOME Length: ? ? km Width: 20 km
![COOBER PEDY DOME Length 100 km Width 40 km COOBER PEDY ? DOME Length: 100 km Width: +40 km](https://slidetodoc.com/presentation_image_h2/68dde19913893f9c4c4d5d591bb947b9/image-13.jpg)
COOBER PEDY ? DOME Length: 100 km Width: +40 km
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