AUSTRALIA/Phanerozoic 225 Figure Latest Neoproterozoic earliest Cambrian (550 530 Ma) palaeogeography The parallel lines crossing central eastern Australia are the Tasman Line (heavy broken line) and the Tasman Toe Line (light broken line), which mark the eastern outcrops of the Proterozoic craton and its wedge out, respect ively KMB, Kanmantoo Marginal Basin; P LB, Prydz Leeuwin Belt Reproduced with permission from Veevers JJ (ed.) (2000) Bil lion Year Earth History of Australia and Neighbours in Gondwanaland Sydney: GEMOC Press Figure Early and Middle Cambrian (530 510 Ma) palaeo geography Legend as in Figure Reproduced with permission from Veevers JJ (ed.) (2000) Billion Year Earth History of Australia and Neighbours in Gondwanaland Sydney: GEMOC Press Figure The initial dispersal of microcontinents by growth of a marginal basin and their return by closure of the basin were followed by subduction, generating a magmatic arc behind which granites were emplaced in an extended region When the subducted slab shallowed, the crust was shortened; when it steepened, the trench rolled back in front of a growing marginal basin The events across Australia and neighbouring Antarctica are shown in plan view in the set of palaeogeographical figures Figure Late Cambrian (510 490 Ma) palaeogeography Legend as in Figure Reproduced with permission from Veevers JJ (ed.) (2000) Billion Year Earth History of Australia and Neighbours in Gondwanaland Sydney: GEMOC Press Figure Early Ordovician (490 458 Ma) palaeogeography The cooling Ross and Delamerian granites are shown in black Legend as in Figure Reproduced with permission from Veevers JJ (ed.) (2000) Billion Year Earth History of Australia and Neighbours in Gondwanaland Sydney: GEMOC Press Latest Neoproterozoic–Earliest Cambrian (550–530 Ma) The Uluru regime was inaugurated by collisions in West Gondwanaland and subduction in Antarctica, which deformed central and north-western Australia to produce mountain ranges and intervening basins where coarse arkose was deposited at the foots of the mountains, as at Uluru (Figure 3) In the south-west, the Prydz-Leeuwin Belt was terminally metamorphosed, and its periphery was intruded by a swarm of dykes In the south-east, the Kanmantoo Marginal Basin grew by back-arc spreading behind the subducting