Further Development of a Precambrian Plate Model by Bruce Eglington, U. of Saskatchewan: 2013/Third Annual PaleoGIS & PaleoClimate Users Conference

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Further development of a Precambrian plate model and its application in identifying sediment provenance

Further development of a Precambrian plate model and its application in identifying sediment provenance

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  • 1. Further development of a Precambrian plate model and its application in identifying sediment provenance Bruce Eglington University of Saskatchewan
  • 2. Overview ► ► Data available to aid model development Current status of model  Improvements to plate boundary delineation  Meso- and Neo-Proterozoic and early Palaeoproterozoic/Neoarchaean  Better visualising different types of mineralisation  Demo model ► ► Definition of Precambrian plates and relevance to Phanerozoic geology Additional constraints provided by detrital zircon provenance assessments
  • 3. Overview ► ► Data available to aid model development Current status of model  Improvements to plate boundary delineation  Meso- and Neo-Proterozoic and early Palaeoproterozoic/Neoarchaean  Better visualising different types of mineralisation  Demo model ► ► Definition of Precambrian plates and relevance to Phanerozoic geology Additional constraints provided by detrital zircon provenance assessments
  • 4. Geochronology ~ 106,000 records in the DateView geochronology database
  • 5. Dyke swarms ~ 6,500 records in the StratDB LIP database, many with geospatial information in ArcMap compilation
  • 6. Deposits ~ 15,000 deposit/mineralisation records in the StratDB database, most with latitude and longitude information. ~4,500 have Pb isotope data
  • 7. Nd T DM
  • 8. Overview ► ► Data available to aid model development Current status of model  Improvements to plate boundary delineation  Meso- and Neo-Proterozoic and early Palaeoproterozoic/Neoarchaean  Better visualising different types of mineralisation  Demo model ► ► Definition of Precambrian plates and relevance to Phanerozoic geology Additional constraints provided by detrital zircon provenance assessments
  • 9. Geophysical constraints
  • 10. U-Pb Formation Ages
  • 11. Nd TDM
  • 12. Geographic extent of dated lithostratigraphic units
  • 13. Interpreted maximum age of blocks
  • 14. Overview ► ► Data available to aid model development Current status of model  Improvements to plate boundary delineation  Plate motion constraints  Meso- and Neo-Proterozoic and early Palaeoproterozoic/Neoarchaean  Better visualising different types of mineralisation  Demo model ► ► Definition of Precambrian plates and relevance to Phanerozoic geology Additional constraints provided by detrital zircon provenance assessments
  • 15. Constraints for Palaeogeographic Reconstructions ► Palaeomag constraints are primary – modelled using    GPlates Paleogis plugin for ArcMap Customised software written by BE
  • 16. Constraints for Palaeogeographic Reconstructions ► Palaeolongitude  Estimated based on the orthoversion concept presented by Mitchell and Evans (2012) Most likely centroid of supercontinent
  • 17. Palaeogeographic Reconstructions ► Extensive set of plates based on   ► Palaeomag constraints are primary – modelled using    ► Geology Aeromagnetic and Gravity Anomalies GPlates Paleogis plugin for ArcMap Customised software written by BE Consider structural vergence directions
  • 18. Overview ► ► Data available to aid model development Current status of model  Improvements to plate boundary delineation  Plate motion constraints  Meso- and Neo-Proterozoic and early Palaeoproterozoic/Neoarchaean  Better visualising different types of mineralisation  Demo model ► ► Definition of Precambrian plates and relevance to Phanerozoic geology Additional constraints provided by detrital zircon provenance assessments
  • 19. Available Palaeogeographic Models ► Phanerozoic    ► ► Paleomap (Chris Scotese) Earthbyte (GPlates) Various commercial models Meso- to Neo-Proterozoic   IGCP 440 (Li et al., 2008) Various other ‘snap-shots’ Palaeoproterozoic to Archaean Various, mostly schematic, ‘snapshots’  Eglington et al. (2013)  Pisarevsky et al. (2013)  Pehrsson et al. (2013)  Paleomap IGCP 440
  • 20. Some available Palaeogeographic Reconstructions for Nuna (Columbia) Rogers and Santosh, 2002 Zhao et al, 2002 Evans and Mitchell, 2011
  • 21. ► Started with Palaeoproterozoic Nuna ► Working forward in time through Mesoproterozoic to Neoproterozoic Rodinia ► Also extending back towards Neoarchaean
  • 22. Overview ► ► Data available to aid model development Current status of model  Improvements to plate boundary delineation  Plate motion constraints  Meso- and Neo-Proterozoic and early Palaeoproterozoic/Neoarchaean  Better visualising different types of mineralisation  Demo model ► ► Definition of Precambrian plates and relevance to Phanerozoic geology Additional constraints provided by detrital zircon provenance assessments
  • 23. Overview ► ► Data available to aid model development Current status of model  Improvements to plate boundary delineation  Plate motion constraints  Meso- and Neo-Proterozoic and early Palaeoproterozoic/Neoarchaean  Better visualising different types of mineralisation  Demo model ► ► Definition of Precambrian plates and relevance to Phanerozoic geology Additional constraints provided by detrital zircon provenance assessments
  • 24. Overview ► ► Data available to aid model development Current status of model  Improvements to plate boundary delineation  Plate motion constraints  Meso- and Neo-Proterozoic and early Palaeoproterozoic/Neoarchaean  Better visualising different types of mineralisation  Demo model ► ► Definition of Precambrian plates and relevance to Phanerozoic geology Additional constraints provided by detrital zircon provenance assessments
  • 25. Reconstruction at 1500 Ma Ages from 1500 – 1580 Ma W. Africa N. Australia Siberia Amazonia W. Australia Gawler Slave Baltica Mawson W. Gneiss Complex Superior Plutonic / volcanic crystallization Metamorphic Cooling Ni-Cu-PGE VMS U
  • 26. Basement control of younger sedimentation From Paul Ramaekers (2011)
  • 27. Basement control of younger sedimentation From Paul Ramaekers (2011)
  • 28. Basement control of younger sedimentation From Paul Ramaekers (2011)
  • 29. Basement control of younger sedimentation From Tankard et al (2009)
  • 30. Basement control of younger sedimentation From Tankard et al (2009)
  • 31. Basement control of younger sedimentation From Tankard et al (2009)
  • 32. Basement control of younger sedimentation From Tankard et al (2009)
  • 33. Overview ► ► Data available to aid model development Current status of model  Improvements to plate boundary delineation  Plate motion constraints  Meso- and Neo-Proterozoic and early Palaeoproterozoic/Neoarchaean  Better visualising different types of mineralisation  Demo model ► ► Definition of Precambrian plates and relevance to Phanerozoic geology Additional constraints provided by detrital zircon provenance assessments
  • 34. Probability
  • 35. Unit Age (Ma) Kaapvaal 1200 3600 1200 3800 Grain Age (Ma)
  • 36. Pilbara Zimbabwe Kaapvaal Neylan Fm Lower Selika Formation 1940 Ma
  • 37. Detrital provenance From Tankard et al (2009)
  • 38. Detrital zircon age spectra for Cape and Karoo sediments
  • 39. Detrital zircon age spectra for Cape and Karoo sediments
  • 40. Detrital zircon age spectra for Cape and Karoo sediments
  • 41. U-Pb Formation Ages
  • 42. U-Pb Formation Ages
  • 43. Cape-Karoo potential provenance sources 850 – 960 Ma
  • 44. Detrital provenance
  • 45. Acknowledgements ► ► IGCP 509 project University of Saskatchewan and NSERC  ► Geological Survey of Canada  ► The Rothwell Group Chris Scotese GPlates software  ► Newmont Areva De Beers Paleogis plugin for ArcMap   ► Ore deposit information (especially via Lesley Chorlton) + various coworkers Various mining companies for student support and money to purchase hardware and software    ► Databases housed at U of S Dietmar Mueller and John Cannon in Sydney, Australia Various software companies for providing academic versions     Embarcadero Steema AtoZed HK Systems