Assessment of suitability for age determination by means of uranium lead isotope ratios in zircons. The rocks described include andesite, dacite, trachyte, rhyodacite and rhyolite.

Drillhole 83KD1A completed by CRA Exploration Pty Ltd In the eastern Polda Basin intersected 793 m of interlayered amygdaloidal basalts and evaporite-bearing reddish-brown mudstones below Carboniferous-Permian sediments. K-Ar geochronology and...

The deposit is in Etina Limestone, an iron rich carbonate of the Willochra Subgroup. 3 phases of mineralization are the result of a polydeformational sequence involving 2 main phases of deformation. The first phase was initiated by D1 folding and...

Surficial sediments are predominantly bioclastic, cool-temperate carbonates. Benthic foraminifera Elphidium crispum', a shallow water species, and 'E. macelliforme, favouring deeper water, provide useful numerical ratio which correlates with water...

Background The establishment of a potassium-argon dating laboratory at Amdel was initiated in 1969, with the South Australian Department of Mines providing financial assistance towards the purchase of equipment and continuing operational support in...

A minimum metamorphic age of greater than 2400 Ma is inferred for two banded iron formations outcropping within the TARCOOLA 1:250 000 mapsheet area. The age obtained is considerably greater than that of the mid-Proterozoic Middleback Group, with...

During September-December 1976, Murnaroo 1 was drilled by the SA Department of Mines to TD 627.5 m near Observatory Hill in the central southern part of the Officer Basin, to investigate the local subsurface stratigraphy and economic potential, and...

The Quaternary stratigraphy in the trench was examined within the Strzelecki dunefield near Montecollina Bore, near Big John Creek and to the south (mainly Balcanoona). Longitudinal and transverse dune sands demonstrated a history of episodic dune...

Following the drying of the very extensive Tertiary lakes, there were 3 complex Pleistocene climatic cycles, or portions thereof, reflecting changes in the world climate related to glacial / interglacial episodes. Describes and interprets 4...

As part of studies on Stratigraphy and chronology of coastal Quaternary sediments in SA, M. vertebralis was dated using radiocarbon 3 and amino acid racemization dating. Results suggest reef connecting Wardang and Goose Islands, rather than being...

SADME stratigraphic drilling, which was undertaken recently based on detailed geophysical modelling of aeromagnetic data, has identified the major linear aeromagnetic anomaly associated with the Karari Fault Zone (NW Gawler Craton) as a major (300 km...

Investigations since 1984 have assessed the groundwater availability. The groundwater supplies are obtained from an extensive unconfined aquifer. The investigations included drilling of investigation wells, aquifer testing, studies of the recharge...

Mapping, trenching and auger drilling have shown that dune sands overlie fluvio lagoonal clayey sand which overlies stranded beach Holocene sand. Indicated and inferred reserves total 66 000 tonnes of plaster and mortar sand and 384 000 tonnes of...

Data from AMDEL and SADME reports that pertain to Burra Group sedimentary rocks are systematically compiled as a data base for future reference and interpretation. These include organic carbon and carbonate content; sulphur and sulphide content;...

Program ISOCHRON is a two-error regression program for calculation of Rb Sr isochron ages and initial Sr Sr ratios. Originally written for a Cyber mainframe, the program has been modified for NEC-APC III, IBM-PC and Olivetti M24 personal computers....

Radiocarbon dates were measured from non-marine shelly fossils and from calcareous paleosols in the Lake Frome area of South Australia (Tarkarooloo Basin, Callen and Tedford, 1976), mainly in an attempt to establish the sequence of late Quaternary...

Major units present are 2 suites of Middle Proterozoic granite and Middle Pleistocene calcarenite. The older granite suite has an age of about 1585 Ma, while the other suite had intrusive age of 1457 +- 25 Ma. The granites are enriched in K2O and SiO2.

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The Carnot Gneisses form an extensive layered sequence that crops out in southernmost Eyre Peninsula. They consist of garnetiferous quartzofeldspathic gneiss, hypersthene gneiss, granitic gneiss and basic granulite. Rb/Sr whole rock studies indicate a...

Radiocarbon dates from pedogenic carbonate are several thousand years too young, contrary to previous work, and are not reliable estimates of the age of pedogenesis.