ABSTRACT
The precise geometric definition of Tertiary palaeochannels on the Precambrian Gawler Craton of South Australia is important in the exploration for placers, secondary geochemical deposits and groundwater resources in the channel sediments. The concentration of minerals in the channels is also of interest as a guide to the location of mineralisation in the craton. Methods used to define the palaeochannels include interpretations from field exposures, geological and drilling data, computer modelling of ancient landscapes, digital elevation models, remote sensing imagery, gravity, seismic, and transient electromagnetics, all of which have contributed to a systematic investigation of both shape and depth of the channels. Evidence from sedimentology is combined with that of other geological and geophysical characteristics to arrive at a general reconstruction of palaeochannel architecture and depositional environment.
