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1.8 Ga
1
Archaean cratons
1
Archaean detrital zircon grains
1
Dalradian Supergroup
East Laurentian margin Detrital zircons
1
Geology
1
Mesoproterozoic
1
Palaeoproterozoic
1
Southern Highland groups
1
concordia plots Archaean grains
detrital age peaks
1
detritu
1
evidence
1
region
1
tectonothermal event
1
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