Further Development of a Precambrian Plate Model by Bruce Eglington, U. of Saskatchewan: 2013/Third...
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![Page 1: Further Development of a Precambrian Plate Model by Bruce Eglington, U. of Saskatchewan: 2013/Third Annual PaleoGIS & PaleoClimate Users Conference](https://reader036.fdocuments.us/reader036/viewer/2022062308/55a97bbf1a28abf2598b45e3/html5/thumbnails/1.jpg)
Further development of a Precambrian plate model and its application in identifying sediment provenance
Bruce Eglington University of Saskatchewan
![Page 2: Further Development of a Precambrian Plate Model by Bruce Eglington, U. of Saskatchewan: 2013/Third Annual PaleoGIS & PaleoClimate Users Conference](https://reader036.fdocuments.us/reader036/viewer/2022062308/55a97bbf1a28abf2598b45e3/html5/thumbnails/2.jpg)
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
![Page 3: Further Development of a Precambrian Plate Model by Bruce Eglington, U. of Saskatchewan: 2013/Third Annual PaleoGIS & PaleoClimate Users Conference](https://reader036.fdocuments.us/reader036/viewer/2022062308/55a97bbf1a28abf2598b45e3/html5/thumbnails/3.jpg)
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
![Page 4: Further Development of a Precambrian Plate Model by Bruce Eglington, U. of Saskatchewan: 2013/Third Annual PaleoGIS & PaleoClimate Users Conference](https://reader036.fdocuments.us/reader036/viewer/2022062308/55a97bbf1a28abf2598b45e3/html5/thumbnails/4.jpg)
Geochronology
~ 106,000 records in the DateView geochronology database
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Dyke swarms
~ 6,500 records in the StratDB LIP database, many with geospatial information in ArcMap compilation
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Deposits
~ 15,000 deposit/mineralisation records in the StratDB database, most with latitude and longitude information. ~4,500 have Pb isotope data
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Nd
T DM
![Page 8: Further Development of a Precambrian Plate Model by Bruce Eglington, U. of Saskatchewan: 2013/Third Annual PaleoGIS & PaleoClimate Users Conference](https://reader036.fdocuments.us/reader036/viewer/2022062308/55a97bbf1a28abf2598b45e3/html5/thumbnails/8.jpg)
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
![Page 9: Further Development of a Precambrian Plate Model by Bruce Eglington, U. of Saskatchewan: 2013/Third Annual PaleoGIS & PaleoClimate Users Conference](https://reader036.fdocuments.us/reader036/viewer/2022062308/55a97bbf1a28abf2598b45e3/html5/thumbnails/9.jpg)
Geophysical constraints
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U-Pb Formation Ages
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Nd TDM
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Geographic extent of dated lithostratigraphic units
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Interpreted maximum age of blocks
![Page 14: Further Development of a Precambrian Plate Model by Bruce Eglington, U. of Saskatchewan: 2013/Third Annual PaleoGIS & PaleoClimate Users Conference](https://reader036.fdocuments.us/reader036/viewer/2022062308/55a97bbf1a28abf2598b45e3/html5/thumbnails/14.jpg)
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
![Page 15: Further Development of a Precambrian Plate Model by Bruce Eglington, U. of Saskatchewan: 2013/Third Annual PaleoGIS & PaleoClimate Users Conference](https://reader036.fdocuments.us/reader036/viewer/2022062308/55a97bbf1a28abf2598b45e3/html5/thumbnails/15.jpg)
► Palaeomag constraints are primary – modelled using GPlates Paleogis plugin for ArcMap Customised software written by BE
Constraints for Palaeogeographic Reconstructions
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► Palaeolongitude Estimated based on the orthoversion concept presented by
Mitchell and Evans (2012)
Most likely centroid of supercontinent
Constraints for Palaeogeographic Reconstructions
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Palaeogeographic Reconstructions
► Extensive set of plates based on Geology Aeromagnetic and Gravity Anomalies
► Palaeomag constraints are primary – modelled using GPlates Paleogis plugin for ArcMap Customised software written by BE
► Consider structural vergence directions
![Page 18: Further Development of a Precambrian Plate Model by Bruce Eglington, U. of Saskatchewan: 2013/Third Annual PaleoGIS & PaleoClimate Users Conference](https://reader036.fdocuments.us/reader036/viewer/2022062308/55a97bbf1a28abf2598b45e3/html5/thumbnails/18.jpg)
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
![Page 19: Further Development of a Precambrian Plate Model by Bruce Eglington, U. of Saskatchewan: 2013/Third Annual PaleoGIS & PaleoClimate Users Conference](https://reader036.fdocuments.us/reader036/viewer/2022062308/55a97bbf1a28abf2598b45e3/html5/thumbnails/19.jpg)
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, ‘snap-
shots’ Eglington et al. (2013) Pisarevsky et al. (2013) Pehrsson et al. (2013)
Paleomap
IGCP 440
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Rogers and Santosh, 2002 Zhao et al, 2002
Evans and Mitchell, 2011
Some available Palaeogeographic Reconstructions for Nuna (Columbia)
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► Started with Palaeoproterozoic Nuna
► Working forward in time through Mesoproterozoic to Neoproterozoic Rodinia
► Also extending back towards Neoarchaean
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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
![Page 23: Further Development of a Precambrian Plate Model by Bruce Eglington, U. of Saskatchewan: 2013/Third Annual PaleoGIS & PaleoClimate Users Conference](https://reader036.fdocuments.us/reader036/viewer/2022062308/55a97bbf1a28abf2598b45e3/html5/thumbnails/23.jpg)
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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
![Page 28: Further Development of a Precambrian Plate Model by Bruce Eglington, U. of Saskatchewan: 2013/Third Annual PaleoGIS & PaleoClimate Users Conference](https://reader036.fdocuments.us/reader036/viewer/2022062308/55a97bbf1a28abf2598b45e3/html5/thumbnails/28.jpg)
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
![Page 29: Further Development of a Precambrian Plate Model by Bruce Eglington, U. of Saskatchewan: 2013/Third Annual PaleoGIS & PaleoClimate Users Conference](https://reader036.fdocuments.us/reader036/viewer/2022062308/55a97bbf1a28abf2598b45e3/html5/thumbnails/29.jpg)
Reconstruction at 1500 Ma Ages from 1500 – 1580 Ma
W. Australia
N. Australia
Gawler
Mawson
Siberia
Baltica
Amazonia
W. Africa
Superior
Slave
W. Gneiss Complex
VMS U Ni-Cu-PGE
Plutonic / volcanic crystallization
Cooling Metamorphic
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Basement control of younger
sedimentation
From Paul Ramaekers (2011)
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From Paul Ramaekers (2011)
Basement control of younger
sedimentation
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From Paul Ramaekers (2011)
Basement control of younger
sedimentation
![Page 33: Further Development of a Precambrian Plate Model by Bruce Eglington, U. of Saskatchewan: 2013/Third Annual PaleoGIS & PaleoClimate Users Conference](https://reader036.fdocuments.us/reader036/viewer/2022062308/55a97bbf1a28abf2598b45e3/html5/thumbnails/33.jpg)
Basement control of younger
sedimentation
From Tankard et al (2009)
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Basement control of younger
sedimentation
From Tankard et al (2009)
![Page 35: Further Development of a Precambrian Plate Model by Bruce Eglington, U. of Saskatchewan: 2013/Third Annual PaleoGIS & PaleoClimate Users Conference](https://reader036.fdocuments.us/reader036/viewer/2022062308/55a97bbf1a28abf2598b45e3/html5/thumbnails/35.jpg)
Basement control of younger
sedimentation
From Tankard et al (2009)
![Page 36: Further Development of a Precambrian Plate Model by Bruce Eglington, U. of Saskatchewan: 2013/Third Annual PaleoGIS & PaleoClimate Users Conference](https://reader036.fdocuments.us/reader036/viewer/2022062308/55a97bbf1a28abf2598b45e3/html5/thumbnails/36.jpg)
Basement control of younger
sedimentation
From Tankard et al (2009)
![Page 37: Further Development of a Precambrian Plate Model by Bruce Eglington, U. of Saskatchewan: 2013/Third Annual PaleoGIS & PaleoClimate Users Conference](https://reader036.fdocuments.us/reader036/viewer/2022062308/55a97bbf1a28abf2598b45e3/html5/thumbnails/37.jpg)
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
![Page 38: Further Development of a Precambrian Plate Model by Bruce Eglington, U. of Saskatchewan: 2013/Third Annual PaleoGIS & PaleoClimate Users Conference](https://reader036.fdocuments.us/reader036/viewer/2022062308/55a97bbf1a28abf2598b45e3/html5/thumbnails/38.jpg)
Pro
ba
bil
ity
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Grain Age (Ma)
Un
it A
ge
(M
a)
Kaapvaal
3600
1200
1200 3800
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1940 Ma
Neylan Fm
Lower Selika Formation
Pilbara
Zimbabwe
Kaapvaal
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From Tankard et al (2009)
Detrital provenance
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Detrital zircon age spectra for Cape and Karoo sediments
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Detrital zircon age spectra for Cape and Karoo sediments
![Page 44: Further Development of a Precambrian Plate Model by Bruce Eglington, U. of Saskatchewan: 2013/Third Annual PaleoGIS & PaleoClimate Users Conference](https://reader036.fdocuments.us/reader036/viewer/2022062308/55a97bbf1a28abf2598b45e3/html5/thumbnails/44.jpg)
Detrital zircon age spectra for Cape and Karoo sediments
![Page 45: Further Development of a Precambrian Plate Model by Bruce Eglington, U. of Saskatchewan: 2013/Third Annual PaleoGIS & PaleoClimate Users Conference](https://reader036.fdocuments.us/reader036/viewer/2022062308/55a97bbf1a28abf2598b45e3/html5/thumbnails/45.jpg)
U-Pb Formation Ages
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U-Pb Formation Ages
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Cape-Karoo potential provenance sources 850 – 960 Ma
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Detrital provenance
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Acknowledgements ► IGCP 509 project ► University of Saskatchewan and NSERC
Databases housed at U of S
► Geological Survey of Canada Ore deposit information (especially via Lesley Chorlton) + various coworkers
► Various mining companies for student support and money to purchase hardware and software
Newmont Areva De Beers
► Paleogis plugin for ArcMap The Rothwell Group Chris Scotese
► GPlates software Dietmar Mueller and John Cannon in Sydney, Australia
► Various software companies for providing academic versions Embarcadero Steema AtoZed HK Systems