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Location: 52 km SE from Dajarra, Queensland, Australia
Durimbil DrSelwynQueensland, Australia4824
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Phosphate Hill is located within the Lower-Middle Cambrian deposits of the Duchess Embayment. The latter is part of the Burke River Outlier which is appended to the Georgina Basin (Russell and Trueman 1971). The work of Smith (1967) summarised the geology of the Georgina Basin and the following outline is drawn from that work and from Southgate (1983).The Georgina Basin is a large (~324,000km2) sedimentary basin that contains both marine sediments (dominantly carbonates) from the Cambrian and Ordovician and freshwater deposits (dominated by sandstones and siltstones) developed during the Devonian or Siluro-Devonian. Although a number of deformation episodes are evident in places, with structures being locally intense in some areas, there is no evidence of metamorphism in any of the sequences. Precambrian sequences define all except the north-western and south-eastern margins. In the northern areas Cambrian strata from the Wiso and Daly River basins merge with the Georgina Basin sediments whilst in the south Cretaceous sediments of the Great Artesian Basin overlap those of the Georgina Basin. The phosphatic deposits of this Basin occur along the eastern side of the basin and in association with the Wonarah High (Northern Territory) (Green 1979, Cook and Shergold 1978).The Burke River Outlier, of which the Duchess Embayment is part, is an appendage to the south-eastern side of the Georgina Basin. The Outlier itself is just under 100km long, ~30km wide and has been described by Russell and Trueman (1971) as a “graben containing mainly lower Palaeozoic sediments up to 5,000 feet [1500m] thick”. It is a shallow depositional basin that is fault-bounded on all except its southern side where the sediments connect via a large trough to those of the Georgina Basin (Southgate 1983, Russell and Trueman 1971).The exact physical relationship between the mostly marine Palaeozoic sediments within the southern and western zones of the Burke River Outlier and the marine and freshwater sediments within the Georgina Basin is obscured by the presence of the overlying Cretaceous continental successions of the Great Artesian Basin (Southgate 1983, Russell and Trueman 1971). Within the Outlier, the sedimentary sequences are the result of a series of marine transgressions and regressions that created shallow, narrow epeiric seas during which the phosphorite horizons were deposited (Southgate 1983, Cook and McElhinney 1978, Russell and Trueman 1971).
