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Kenorland(~2.7
Ga ago, Neoarchean sanukitoid cratons and new continental crust
formed Kenorland. Protracted tectonic magna plume rifting occurred
2.48 to 2.45 Ga and this contributed to the Paleoproterozoic
glacial events in 2.45 to 2.22 Ga. Final breakup occurred ~2.1
Ga.)
Ur(~3
Ga ago, Classified as the earliest known landmass. Ur, however, was
probably the largest, perhaps even the only continent three billion
years ago. While probably not a supercontinent, one can argue that
Ur was a supercontinent for its time, even if it was smaller than
Australia is today.
Still, an older rock formation now located in Greenland dates back
from Hadean times.)
Vaalbara(~3.6 Ga
ago. Evidence is the Yilgarn Craton, Western Australia and the
worldwide Archean greenstone belts that were subsequently spread
out across Gondwana and Laurasia)
Yilgarn(Zircon crystals from the Jack Hills of the Narryer Gneiss
Terrane, Yilgarn craton, Western Australia and also 300 km.
south point to a continental crust formation between 4.4-4.3 Ga.
Evidence is the high Oxygen-18 values of 8.5 and micro-inclusions
of SiO2 in these zircon crystals consistent with growth from a
granitic source supracrustal material, low-temperature interactions
and a liquid ocean.)
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