No abstract available

Investigation into geodesy used by Transit system before WGS72; in AGSO library

Executive Summary Between the 6th and 10th December 1999, the Australian Geological Survey Organisation, in collaboration with the NSW Environment Protection Authority and the Department of Land and Water Conservation, conducted a field survey of Durras Lake, South East, NSW. The objectives of the survey were to: (i) measure the net fluxes of sediment metabolites from the major sediment facies; (ii) estimate the rate and significance of denitrification; and (iii) field test modifications to AGSO automated benthic chambers. Eight chambers were deployed on two sediment facies (sand and mud). Time series of water samples collected from these chambers were used to determine nutrient flux rates and sediment respiration. The following observations were made: At the time of the survey, the deep mud basin was stratified with an anoxic, saline bottom layer and fresher well oxygenated surface waters.. Respiration dominated (ie oxygen demand of the sediments was greater than production via photosynthesis) in each chamber incubation in the mud and sand facies. TCO2 fluxes ranged between 13.3 ?57.4 mmol m-2 day-1 in the mud facies and 39.0 ?106.3 mmol m-2 day-1 in the sand facies. Organic carbon being degraded in the deeper mud basin was primarily of a diatomaceous composition. Dark respiration in the sand facies was not consistent with a mainly diatomaceous origin of organic carbon. Denitrification efficiencies were relatively low in both the sand and mud facies. Low denitrification rates in the mud facies may be related to the low concentrations of dissolved oxygen in the water overlying the sediments. Tests of AGSO system for direct measurement of denitrification using benthic chambers and N2 measurement by quadropole mass spectrometer were successful.

No abstract available

EXECUTIVE SUMMARY The estuarine process study of Wallis Lake (Webb, McKeown and Associates) identified: nutrient and animal faecal pollution; and human faecal pollution and other urban runoff pollutants from the Forster-Tuncurry area as the principal source of pollutants in the estuary. The major findings of this study are listed below. Rural and Urban Inputs The sediments at each site contained a unique miospore signature (pollen and spore) characteristic of catchment sources (although no specifically urban signature was found). The majors rivers (Sites 1 and 5) are characterised by specific biomarkers derived from terrestrial plants and by very high concentrations of dry sclerophyll (Eucalyptus Gummifera type) pollen and sclerophyll swamp (Allocasuarina/Casuarina) pollen respectively. The major river sites have strong signals related to herbivore faecal contamination, most probably from cattle. There was little input of pollen or biomarkers from the rural catchments to the shallow lagoon that constitutes the southern portion of Wallis Lake. No specifically urban signature was detected. Urban sources, such as human sewage and petroleum products were not found at Site 2 (urban catchment end-member) or any of the other sites. No specifically urban pollen was found at Site 2, although this site did have the highest concentration of exotic pollen Organic Matter in the Sediments The organic matter present at each site consists of a mixture of terrestrial and algal material; however, it is the algal material that decomposes most rapidly. Dinoflagellate indicators (microfossils and biomarkers) were present in low concentrations The occurrence of distinctive suites of miospores and biomarkers for rural catchments and the association of high concentrations of faecal (herbivore) biomarkers with rural inputs indicates that the input of organic material from these catchments can be mapped throughout the lake.

No abstract available

In 1986, the Bureau of Mineral Resources (BMR) set out to rekindle exploration interest in the Great Australian Bight and to answer some of the perceived geological problems of the area, by conducting a regional framework multichannel seismic survey with follow-up sampling and heatflow work using the RfV Rig Seismic. At about the same time, the South Australian Department of Mines and Energy (SADME) commenced a project that involved re-interpreting existing company seismic data in the Duntroon Basin and other areas in South Australian waters, with a view to promoting a new round of exploration. In 1987, it was decided that BMR and SADME should pursue a joint study, with the aim of covering as much of the Great Australian Bight as possible. Areas of responsibility were allocated such that SADME concentrated on the shallow water Duntroon and Denman Basins, while BMR studied the deeper water Great Australian Bight Basin (including the Eyre Sub-basin), the Polda Trough, and the Bremer Basin further west. This folio is the principal product of the joint study. Since this report is the combined effort of two widely separated organisations, it is inevitable that there will be some differences in interpretation and style of presentation. While the editors (Stagg, Cockshell, and Hill) have endeavoured to produce a final document that is devoid of internal inconsistencies, no doubt some will still remain.

This Oil and Gas Resources of Australia 2006 publication is the successor to Oil and Gas Resources of Australia 2005 and continues as the definitive reference on exploration, development and production of Australia's petroleum resources. The tables describe: - wells drilled - seismic surveys - petroleum discoveries - petroleum reserves - production and development including a chronological listing of offshore facilities

This publication is the successor to Oil and Gas Resources of Australia 2006 and continues as the definitive reference on exploration, development and production of Australia's petroleum resources. The tables describe: - wells drilled - seismic surveys - petroleum discoveries - petroleum reserves - production and development including a chronological listing of offshore facilities

This Oil and Gas Resources of Australia 2009 publication is the successor to Oil and Gas Resources of Australia 2008 and continues as the definitive reference on exploration, development and production of Australia's petroleum resources. The tables describe: - wells drilled - seismic surveys - petroleum discoveries - petroleum reserves - production and development, including forecasts of crude oil and condensate form 2010 to 2025 and a listing of offshore facilities