Figure 2
From: Metamorphic turnover at 2 Ga related to two-stage assembly of Columbia
Nuna paleogeographic reconstructions at (A) ca. 1.86 Ga, (B) ca. 1.8 Ga, and (C) ca. 1.6 Ga. Large grey arrows show the temporal succession. Smaller bold black arrows suggest tectonic motion, with smaller curved arrow in the 1.6 Ga reconstruction indicates the rearrangement of the North Australian Craton relative to Laurentia24. An alternative position of the North China Craton is also shown, which is not supported by paleomagnetic data3. Dotted continent outlines in (A) indicate proposed accompanying motions after the assembly of NAC. Abbreviations for Baltica: S Sarmatia, V-U Volgo-Uralia, Ka Karelia, Ko Kola. Greenland (in blue) G-Rae Greenland-Rae Craton, R Rockall, NWS-H NW Scotland and Hebrides. China (in red): NCC North China Craton. Australia (in yellow): proto-NAC proto-North Australian Craton, CLP Central Lamboo Province, HO Hooper Orogeny, HCO Halls Creek Orogeny, YO Yampi Orogeny, WAC West Australian Craton, SAC South Australian Craton. References for tectonic boundaries and structures: (I) Cutts and Dyck29; (II) Corrigan et al.26; (III) St-Onge et al.27 and Harrison and St-Onge73, Kolb et al.74, Buchan et al.35; (IV) Park75; (V) Betts et al. (2015); (VI) Brown et al.62, Zhang et al.76, Wan et al.3; (VII) Chen et al.77; (VIII) Buchan et al.35, Lathinen et al.78; (IX) Perhsson et al.18,28; (X) Furlanetto et al.51.
