Bulletin of the Geological Society of Malaysia, Volume 19, April 1986, pp. 103 – 107
Geology Department, University of Tasmania, Hobart, Tasmania, Australia.
Department of Earth Sciences, Memorial University, St. Johns, Newfoundland, Canada.
Abstract: Provenance studies on the Palaeozoic rocks from Thailand and Malaysia (parts of the Sibumasu Block or Shan-Thai Block) suggest proximity to a Precambrian craton. Biogeographic and taxonomic studies on Upper Cambrian through Ordovician trilobite and mollusc faunas suggest that this craton is northern Australia and an Ordovician placement next to Australia is probable.
Constraints on the rift-drift sequence are provided by the probable glacial sediments of Upper Carboniferous age in Thailand and Malaysia and by the limited number of unconformities recorded in the sedimentary basins of northern Australia. An Early Carboniferous break-up is most likely, putting Sibumasu in moderate, but frigid, latitudes by the Late Carboniferous and in the subtropics by the Early Permian.
Collision with the Indochina Block took place in the Triassic.