Check out this site:
for a plate reconstruction animation (avi format)
also see attached gif map
However as a brief summary:
10 Ma (million
years ago) there was a continious melanesian arc
including PNG, Solomons, Vanautu, Fiji and Tonga.
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
4-0 Ma Lau
Basin opens and continued extension without
rotation. Mantle upwelling in Koro sea region.
Lomaiviti Group volcanos erupt.
Tel: (+679) 344 0166 or 344 0344
Ovalau Watersports Ltd., Box 149 Levuka, Ovalau, Fiji
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