Fig. 8. Cartoons (at different scales) to illustrate the history of the Phuket-Slate Belt
terrane. (a) In the Early-Middle Permian, Sibumasu having rifted from Gondwana
preserved deep, rift-bounded basins of glacio-marine sediments. (b) An Andeantype
margin developed with intrusion of I-type granites, possibly as early as the Late
Triassic, which persisted at least to the Cretaceous and probably into the
Palaeogene. The back-arc basin is conjectural, but might account for the deepmarine
Shweminbon Formation in Myanmar. (c) Dextral strike-slip faulting was
probably most active in the Late Cretaceous–Palaeogene; by the end-Palaeogene
the Phuket-Slate Belt terrane had been dislocated from its original location, and
together with its granites, i.e. the Western Granite Province, was translated along
the margin of Sundaland. PMZ is the Paunglaung Mawchi Zone.