Zealandia; the new continent?
In the beginning of 2017, a team lead by Nick Mortimer the geologist at GNS Science in Dunedin, announced a new continent; Zealandia. It is a region spanning 5 million square kilometers, which includes New Zealand and New Caledonia, a single and intact piece of continental crust which is geologically separateed from Australia. It seems that Zealandia would probably long ago have been recognized as a continent. The obtained map from Earth’s gravitational field clearly show that Zealandia is a coherent geographical feature expanding from near Australia’s northeastern coast well past the islands of New Zealand. Sea-floor samples reveal that Zealandia consists of light continental crust and not the dark volcanic rocks that make up nearby underwater plateaus. The area seems to be structurally intact, rather than a mash-up of different continental-crust fragments.
1- Mortimer, N. et al. GSA Today http://dx.doi.org/10.1130/GSATG321A.1 (2017).
3- Sandwell, D. T. et al. Science 345, 65–67 (2014).