Plate tectonics and formation of the Fiji Group

The oldest rock in Fiji is about 35 Million years old and are found in Western Viti Levu. They formed in the Late Eocene when the Pacific plate got pushed under the Australian plate....
The age and origin of the Pacific islands

Check out this site:
for a plate reconstruction animation (avi format)
also see attached gif map

  The Lomaiviti Group is among the geologicaly yungest in Fiji. The islands  formed less than 10 Million years ago through vulcanic activity and resulting magma eruptions.

Brief summary formation Lomaiviti Islands:

10 Ma (million years ago) there was a continious melanesian arc including PNG, Solomons, Vanautu, Fiji and Tonga.

10 - 8 Ma subduction that was SW orientated ie. the Pacific plate was subducting under the indo-australian from the NW-SW, switched direction ie. the indo-aus plate then subducted under the Pacific.

8-4 Ma the New Hebridies arc swung towards the SW and the Fijian platform was rotated anticlockwise ~ 130°, during this period the fijian platform was also extending and rotating along N-S and E-W orientated strike slip faults. North Fiji Basin spreading

4-0 Ma Lau Basin opens and continued extension without rotation. Mantle upwelling in Koro sea region. Lomaiviti Group volcanos erupt, up welling of magma forms the Islands Moala, Gau, Wakaya, Makogai, Vatu and the sea mount E6.


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