Rocks from Saint Francis Island include trachyte, trachyandesite and rhyolite. Drill core from Dampier DDH1 includes 2 types of dolerite, and from Afmeco KGB3 fresh dolerite or basalt. Other specimens examined include basalt and gneiss from the...

Fine-grained and altered rhyolite, dacites, andesite and basalt were defined.

Thin sections of 3 specimens were examined for traces of organic remains, metallic minerals and the metamorphism of the rocks. Contains petrographic reports.

Rocks have been metamorphosed to amphibolite facies with severe deformation and are probably part of the Barossa Complex rather than the Adelaidean.

Origin of the colour variation could not be determined by optical petrography.

Zircons from altered granite in basement below the Cooper Basin, between 9353 and 9377 feet, are suitable for uranium - lead isotope dating.

2 varieties of granitoid and 1 altered dolerite in basement inlier have been sheared at low temperature but no evidence of regional metamorphism. Several episodes of shearing have taken place. Zircons from granite are probably suitable for age dating.

The jade is produced by series of episodes of recrystallization and replacement during the retrograde metamorphism of prograde amphibolite facies assemblages in impure carbonate sediments. The quality is partly controlled by the original sediment...

5 rocks consist mainly of feldspathic and micaceous quartz arenites of greywacke type, and 1 dolomite. Staining with sodium cobaltinitrite did not indicate any potash feldspar.

Narrow granodiorite dykes at Point Brown exhibit conspicuous banded margins and is cyclic showing systematic variation in mineralogy, geochemistry and grain size. These phenocryst poor, biotite rich layers originated by dynamic crystal sorting during...

Aim of project was to obtain analyses of relevant rock samples and to establish their origin. 19 new analyses were obtained. Many are highly sodic but show no textural evidence of protoliths. The albitic metamorphic rocks were probably originally...

The SADM stratigraphic hole Roopena DDH1 was originally drilled near Roopena homestead in 1967 to TD 155.61 m, and was deepened to TD 249.59 m by SADME in 1978 (as DDH1a) to obtain relationships between the Roopena Volcanics and older units. At...

Reserves of 151 tonnes of basalt are inferred.

There is no abstract created for this record

129 samples indicate that 4 deformation phases are present within this dominantly gneissic terrain: D1, D2, D3, and D5.

Porphyritic rhyolite adjacent to the Stuart Highway, 21 km east of Kingoonya was identified as a potential sealing aggregate deposit. It was tested by 3 holes totalling 26.3 metres. Large reserves (100 000 m3) below 30 cm of overburden were proved.

Petrology of 174 rocks indicate that 5 deformation phases (D1 - D5) are present within this dominantly schistose domain. Describes many samples which contain gneissosity, schistosity or crenulation.

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.

Applicability of radiometrics and the portable gamma ray spectrometer was tested over parts of the southern Gawler Craton. Use of total count and separate counts for potassium, uranium and thorium helped to distinguish lithologies e.g. to locate...

Since 1950, 75 000 tonnes of fine grained, columnar jointed Wisanger Basalt have been quarried, 3 km NW of Kingscote. It is the only aggregate quarry with a crushing plant on K.I, and produces a large range of products. Indicated reserves are 370 000...