AndreaBozzo/ceres-open-data-index huggingface dataset:
National Gravity Compilation 2019 DGIR 0.5VD image

Gravity data measure small changes in gravity due to changes in the density of rocks beneath the Earth's surface. The data collected are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. This National Gravity Compilation 2019 DGIR 0.5VD image is produced from the 2019 Australian National Gravity Grids A series. These gravity data were acquired under the project No. 202008. The grid represented in this image has a cell size of 0.00417 degrees (approximately 435m). The %%MV_DATASETS/SURVEY_NAME% are derived from ground observations stored in the Australian National Gravity Database (ANGD) as at September 2019, supplemented by offshore data sourced from v28.1 of the Global Gravity grid developed using data from the Scripps Institution of Oceanography, the National Oceanic and Atmospheric Administration (NOAA), and National Geospatial-Intelligence Agency (NGA) at Scripps Institution of Oceanography, University of California San Diego. Out of the approximately 1.8 million gravity observations, nearly 1.4 million gravity stations in the ANGD together with marine data were used to generate this grid. The ground gravity data used in this grid has been acquired by the Commonwealth, State and Territory Governments, the mining and exploration industry, universities and research organisations from the 1940's to the present day. Station spacing for ground observations varies from approximately 11 km down to less than 1 km, with major parts of the continent having station spacing between 2.5 and 7 km. The grid shows the half vertical derivative of the de-trended global isostatic residual anomalies (A series) over Australia and its continental margins. The original DGIR was obtained by subtracting 3 quantities (i.e., the near-field isostatic correction, the far-field isostatic correction, and a first order trend correction) from Complete Bouguer Anomaly data (CBA) of the 2019 Australian National Gravity Grids A series. A half vertical derivative was calculated by applying a fast Fourier transform (FFT) process to the DGIR grid of the 2019 Australian National Gravity Grids to produce the grid represented in this image.

Tags: 05vd, A series, Australia, EARTH SCIENCES, Earth sciences, GADDS2.0, NCI, None, Published_External, de-trended, geophysical survey, geophysics, grav, gravity, grid, ground digital data, half vertical derivative, image, isostatic, marine data, raster, residual, satellite data, survey 202008
Organization: Geoscience Australia Data
Australia's Near-pristine Estuaries: Current Knowledge and Management

The purpose of this investigation was to collate previously disparate information on near-pristine estuaries and make it widely available for use by managers, researchers, policy makers and the general public. This information was acquired through scientific articles, reports, conference proceedings, government agencies, grey literature, websites, expert advice and anecdotal observation and was summarised both on a state-by-state basis and at the national level, with emphasis on current knowledge and management.

Tags: AU-EEZ, Earth Sciences, External Publication, Published_External, Report, coasts, marine, resource management
Organization: Geoscience Australia Data
SI 1054 Cape Pasley to Pollock Reef (HIPP SI 1054) Bathymetry 2025 (20250002S)

This is a contracted survey conducted for the Australian Hydrographic Office by EGS Australia as part of the Hydroscheme Industry Partnership Program (HIPP). The survey area is Cape Pasley to Pollock Reef, WA.

Not to be used for navigational purposes

Tags: AusSeabed, Backscatter, Bathymetry, Digital Delivery, EARTH SCIENCES, Indian Ocean, Marine, Offshore Mapping, PMG Emerald, Published_External, Resourcing Australia’s Prosperity, Sampling, multi-beam echosounders
Organization: Geoscience Australia Data
The geochemistry of Lake Frome, a playa lake in South Australia

Lake Frome, a large playa in southeast South Australia, lies at the centre of an internal drainage basin. Sediments and brines in the lake were studied to determine if the movement of fluids and sediments into an internal drainage basin in an arid environment could concentrate metal ions through evaporation or the action of sulphate reducing bacteria. Secondary objectives were the study of continental brines, playa sedimentation, and mound springs. Stratigraphic analysis based on samples from a series of shallow auger holes shows that over the last 17000 years medium to fine sand accumulated on the margins of the lake and mud in the centre. The sediment has issued from streams entering the lake on all but the eastern sides, mainly in delta fans. Three informal stratigraphic units were recognised - upper and lower sandy units, and a muddy unit which is regarded as a lateral equivalent. A salt crust up to 20 cm thick overlies the clastic sediment in the centre of the lake. At the time of the survey about 10 per cent of the lake was covered with water. Both surface and sub-surface waters are hypersaline (26 to 34 percent) and characterized by high concentrations of sodium and chloride ions. The major ions have probably been derived from marine sediments. No enrichment of minor elements was detected in the brines, but lead appears to be leached from the sediments as soluble chloride complexes. Clastic sediments from the lake have been analysed for major and minor elements. Statistical analysis of the results indicates that the upper and lower sands are geochemically similar and that they differ from the muds, which have higher concentrations of organic carbon and certain minor elements. There is no evidence of concentration of metal ions although manganese appears to have been concentrated on the surface of the lake by algae. Mound springs in the northeastern part of the lake differ from those of the southeast in composition of the mound and the water. The composition of the water reflects mixing of artesian water with lake brines.

Tags: Earth Sciences, GA Publication, Journal, Published_External, SA
Organization: Geoscience Australia Data
Popes Eye Bathymetry 2018 (4893/20180002S)

The Popes Eye bathymetry survey was acquired by Deakin University Marine Mapping lab onboard the Motor Vessel Yolla over two days in 2018 (20/01/2018-21/01/2018) using a Kongsberg EM2040c. This survey was collected as part of Parks Victoria project to map all the marine parks within Victorian state waters.

Not to be used for navigational purposes

Tags: AusSeabed, Australia-wide geoscience data, Bass Strait (Great Australian Bight), Bathymetry, EARTH SCIENCES, Great Australian Bight, MV Yolla, Marine, Offshore Mapping, Published_External, Resourcing Australia’s Prosperity, multi-beam echosounders
Organization: Geoscience Australia Data
Gravity, Magnetic and Bathymetry Grids from Levelled Data for Southwest Australia : Great Australian Bight

The Australian Geological Survey Organistaion (AGSO) has produced a set of digital bathymetry, gravity and magnetic grids for the southwest quadrant of Australia (24 - 46S, 106-140E), using all available land, marine and satellite data. The work was done in cooperation with Desmond Fitzgerald &amp; Associates (DFA), and with significant bathymetric data input from the Australian Hydrographic Office (AHO). The results were obtained by performing a network adjustment on marine ship-track data, and combining these with onshore and satellite-derived data.

Tags: Earth Sciences, GA Publication, Published_External, Record, bathymetry, geophysics, gravity, magnetics, marine
Organization: Geoscience Australia Data
Benthic Nutrient Recycling in Port Phillip Bay, Australia

Benthic chamber measurements of the reactants and products involved with biogenic matter remineralization (oxygen, ammonium, nitrate, nitrite, phosphate, silicate, TCO2 and alkalinity) were used to define solute exchange rates between the sediment and overlying water column of Port Phillip Bay, Australia. Measurements at various sites throughout the bay, conducted during the summers of 1994 and 1995, indicate that the variability in flux values within a site is comparable to year-to-year variability (Â±50%). Four regions of the bay were distinguished by sediment properties and the northern region was identified as having 3-30 times greater nutrient regeneration rates than the other regions. Benthic recycling accounted for 63 and 72% of the annualized N and P input, respectively, to the entire bay as determined by summing benthic, dissolved riverine, atmospheric and dissolved effluent sources. However, bay-wide sedimentary denitrification accounted for a loss of 63% of the potentially recyclable N. This fraction is higher than many other coastal regions with comparable carbon loading. Denitrification efficiency is apparently not enhanced by benthic productivity nor by bio-irrigation. The rate of bio-irrigation is negatively correlated with denitrification efficiency. Bio-irrigation was studied using radon-222 and CsCl spike injection chamber measurements. Radon fluxes from sediments in Port Phillip Bay were enhanced over the diffusive flux by 3-16 times. The modelled rate of loss of Cs from chamber water was positively correlated with radon flux enhancement results. Both methods identify regions within Port Phillip Bay that have particularly high rates of non-diffusive pore-water overlying water solute exchange.

Tags: AU-VIC, Earth Sciences, External Publication, Published_External, Scientific Journal Paper, marine, resource management
Organization: Geoscience Australia Data
ALF Compatible Laboratory UV Fluorescence Spectra of 120 Offshore Western Australia Oils Vol 1,2a,2b and CDROM

As part of AGSO's commitment to advancing exploration technology, the Petroleum and Marine Division has been conducting studies into the use of fluorescence signatures as a means of detecting, mapping and typing hydrocarbon seeps to their sources.  AGSO's aim is to provide data that will allow sea surface hydrocarbon anomoloies, detected during Airborne Laser Fluorosensor (ALF) surveys, to be correlated with oils and ultimately characterise the anomolies directly to their source.

This report concludes the first stage of AGSO's 'remote sensing' multi-client study and comprises ultra-violet fluorescence (UVF) emission spectra of 120 open file western Australian oils.  Aliquots of oil samples diluted with n-hexane were analysed by UVF to evaluate the type and quantity of aromatic hydrocarbons present in the samples.  The laboratory UVF data were collected by scanning the 280-500 nm emission response of oils using an excitation wavelength of 266 nm as employed by the ALF system currently being operated by World Geoscience Corp. Ltd.

The purpose of this report is to enable industry to make a comparison of UVF spectra of known oils with ALF surveys carried out off western Australia.  The oils included in this report represent all known offshore western Australian petroleum systems (Table 1) as defined by Bradshaw (1993) and Bradshaw et al.  (1994, 1997) and are compatible with those oils analysed in The Oils of Western Australia study (AGSO and GeoMark Research, 1996).

This report is designed as a stand alone product, with supplementary geological and geochemical information being incorporated from The Oils of Western Australia study (ibid) and published papers.

Tags: AU-WA, Earth Sciences, GA Publication, Other Publication, Published_External, hydrocarbons, marine
Organization: Geoscience Australia Data
Shallow inter-reefal structure of the Capricorn group, southern Great Barrier Reef

276 km of continuous seismic reflection profiles have been obtained from the inter-reef areas of the Capricorn Reefs. Five reflectors were identified, three being widespread: reflector A, the shallowest, is found only close to modern reefs; reflector C is widespread and varies from flat-lying to irregular; the deepest reflector, D, is limited to the area north and west of Heron Island, where it is flat-lying. All the reflectors are assumed to represent erosional surfaces, and the ages of the intervening sequences are not known. Either reflector C, or the present sea bottom and reflector A, represent the surface of the Holocene transgression.

Tags: Earth Sciences, GA Publication, Journal, Published_External, QLD, marine
Organization: Geoscience Australia Data
5028 Block 1 (Southwest) Grid of the Digital Elevation Model (DEM) derived from the radar altimeter and GNSS

A Digital Elevation Model (DEM) is a 3D representation of terrain elevation. It is derived from the radar altimeter and GNSS on the Survey aircraft. The GNSS height measurements are geoidal values derived using the Australian Vertical Working Surface (AVWS). This survey was acquired under the project No. 5028 for the Geological Survey of Western Australia (GSWA). The grid has a cell size of  0.000204 degrees (approximately 20m). The data are given in units of meters.

Tags: Australia, DEM, EARTH SCIENCES, Earth sciences, Elevation, GADDS2.0, NCI, Published_External, Western Australia, digital data, geoid, geophysical survey, geophysics, grid, raster, survey 5028, terrain
Organization: Geoscience Australia Data
A reassessment of the petroleum systems in the offshore northern Perth Basin

The discovery of commercial oil in the Cliff Head-1 well in 2001 set an important milestone in the exploration history of the offshore northern Perth Basin. The region had been largely underexplored before then, partly due to the perception that the Hovea Member, a 10 to 40 m-thick unit straddling the Permian-Triassic boundary (PTB) and recognized as the main source of onshore petroleum accumulations, was not developed offshore (Crostella, 2001). The typing of the Cliff Head oil to the Hovea Member provided evidence that the key onshore petroleum system extends offshore and revitalized exploration in the area with 13 new field wildcat wells drilled since 2002. Three discoveries have been made subsequently further offshore in the Abrolhos Sub-basin with gas retrieved in Frankland-1 and Perseverance-1 and oil and gas in Dunsborough-1.

A review of source rock and oil geochemical data was undertaken by Geoscience Australia in the offshore northern Perth Basin as part of a major integrated study aimed at reassessing the basin's prospectivity. This work supports the release of offshore exploration areas W13-19 and W13-20, two major blocks straddling the Houtman and Abrolhos Sub-basins with small portions extending into the Zeewyck and Gascoyne Sub-basins (Fig. 1). Well control is provided by 5 wells from the Wittecarra Terrace in the northern Abrolhos Sub-basin and Houtman-1 in the Houtman Sub-basin.

Tags: Conference Paper, Earth Sciences, External Publication, Published_External, marine
Organization: Geoscience Australia Data
Geological report on the surface penstock route and the No 2 power station site, Port Moresby hydroelectric scheme

Water is to be conveyed from the projected Sogeri Dam, about half a mile above Rouna Falls, to the projected Power Station No.2 at the foot of the falls. One proposal is that a low-pressure penstock should be laid from the dam to a surge tank near the head of the falls, and a high-pressure penstock conveys the water from this point to the power station. The rocks are volcanic agglomerate, a few tuffs, and basal conglomerate, all part of the Astrolabe Agglomerate. They are flat-lying and undisturbed, except for jointing and one instance of minor shearing. The agglomerate and conglomerate are generally competent, but the tuff which marks the conglomerate-agglomerate transition is probably weak and incompetent. Investigation has centred on the high-pressure penstock route and power station site, and has involved outcrop mapping and seventeen diamond drill holes. The main problem on the penstock route is the upper scree slope, where boulders and rubble are up to thirty feet deep. The best route appears to be a direct one from near peg T8 over hole P5 to the power station. Power station foundations appear to be sound. Alternative routes for the low-pressure penstock are at present being investigated. Three or four shallow diamond drill holes will be needed at a later date.

Tags: Earth Sciences, GA Publication, Published_External, Record, geology
Organization: Geoscience Australia Data
Temporal and fine-scale variation in the biogeochemistry of Jervis Bay

The identification of suitable abiotic surrogates for biological diversity requires the collection of both physical and biological data. However, logistical constraints often preclude experimental designs that incorporate spatial and temporal replication. Given the quite limited resources normally available for surveys, the investigation of appropriate surrogates involves a trade-off between overall spatial coverage and replication. We have completed a survey in Jervis Bay in which environmental and infaunal data were collected contemporaneously in order to be combined with similar data from a previous winter survey (survey number GA309) to investigate variation across seasons. Because there will be a certain error in sampling at the exact location as the previous survey, the survey design also required that replicate samples be taken at a set number of stations in order to investigate fine-scale variability (at the scale of metres).

We used grabs to collect paired geochemical and biological samples from thirty-two stations in a defined grid near Darling Rd; at eight of these stations we deployed three pairs of grabs to investigate fine-scale variability. Due to good weather and extra ship time available, we also deployed a CTD to investigate vertical temperature and salinity profiles at each station in the Darling Rd grid, as well as at stations throughout the entire bay. Samples are expected to be processed and analysed by late 2009, but preliminary results indicate that most physical variables and infaunal assemblages varied between seasons. In addition, variation among infaunal assemblages seems greater among stations (hundreds of meters) than within replicates at stations (meters).

Tags: AU-NSW, CERF, Earth Sciences, GA Publication, Published_External, Record, marine, marine park, marine survey, organic geochemistry, salinity
Organization: Geoscience Australia Data
National Gravity Compilation 2019 DGIR 1VD image

Gravity data measure small changes in gravity due to changes in the density of rocks beneath the Earth's surface. The data collected are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. This National Gravity Compilation 2019 DGIR 1VD image is produced from the 2019 Australian National Gravity Grids A series. These gravity data were acquired under the project No. 202008. The grid represented in this image has a cell size of 0.00417 degrees (approximately 435m). The data are derived from ground observations stored in the Australian National Gravity Database (ANGD) as at September 2019, supplemented by offshore data sourced from v28.1 of the Global Gravity grid developed using data from the Scripps Institution of Oceanography, the National Oceanic and Atmospheric Administration (NOAA), and National Geospatial-Intelligence Agency (NGA) at Scripps Institution of Oceanography, University of California San Diego. Out of the approximately 1.8 million gravity observations, nearly 1.4 million gravity stations in the ANGD together with marine data were used to generate this grid. The ground gravity data used in this grid has been acquired by the Commonwealth, State and Territory Governments, the mining and exploration industry, universities and research organisations from the 1940's to the present day. Station spacing for ground observations varies from approximately 11 km down to less than 1 km, with major parts of the continent having station spacing between 2.5 and 7 km. The grid shows the first vertical derivative of the de-trended global isostatic residual anomalies (A series) over Australia and its continental margins. The original DGIR was obtained by subtracting 3 quantities (i.e., the near-field isostatic correction, the far-field isostatic correction, and a first order trend correction) from Complete Bouguer Anomaly data (CBA) of the 2019 Australian National Gravity Grids A series. A first vertical derivative was calculated by applying a fast Fourier transform (FFT) process to the DGIR grid of the 2019 Australian National Gravity Grids to produce the grid represented in this image.

Tags: 1vd, A series, Australia, EARTH SCIENCES, Earth sciences, GADDS2.0, NCI, None, Published_External, de-trended, first vertical derivative, geophysical survey, geophysics, grav, gravity, grid, ground digital data, image, isostatic, marine data, raster, residual, satellite data, survey 202008
Organization: Geoscience Australia Data
Deep-sea sediments and manganese nodules from the southern Tasman Sea

Two manganese nodules having a high clay content, a low Mn:Fe ratio, and low contents of valuable metals (Ni 0.25%, Cu 0.17%, Co 0.06%) were recovered in a grab sample during a short geological cruise in HMAS Kimble in the southern Tasman Sea in May 1979. Five stations were occupied. Free-fall grabs recovered sediment or pumice from four stations; nothing was recovered from the fifth. The carbonate compensation depth in the region is about 4500 m. Reddish brown clay, but no manganese nodules, was recovered in the central southern Tasman Sea, from depths of 4900-5100 m. The nodules, together with grey calcareous mud, were obtained from a depth of 4300 m, farther to the northwest, near Gascoyne Seamount (250 n. miles SE of Sydney).

The results suggest nodules with high metal values are likely to exist only in the broad and deep depression in the central southern Tasman Sea southeast of Gascoyne Seamount, where sedimentation rates are low and oxidising conditions prevail. Whether nodule fields are present or not will only be resolved by considerably more sampling.

Tags: AU-TAS, Earth Sciences, GA Publication, Published_External, Record, marine
Organization: Geoscience Australia Data
Australia's Maritime Jurisdiction off the Northwest Shelf 2014

Map showing Australia's Maritime Jurisdiction off the Northwest Shelf. Updated in June 2014 from "Australia's Maritime Jurisdiction off the Northwest Shelf" (GeoCat 69341) to conform with "Australian Maritime Boundaries 2014" data by Geoscience Australia.
One of the 27 constituent maps of the "Australia's Maritime Jurisdiction Map Series" (GeoCat 71789).
Depicting Australia's continental shelf  as proclaimed in the "Seas and Submerged Lands (Limits of Continental Shelf) Proclamation 2012" established under the "Seas and Submerged Lands Act 1973".
Background bathymetric image is derived from a combination of the 2009 9 arc second bathymetric and topographic grid by GA and a grid by Smith and Sandwell, 1997. Background land imagery derived from Blue Marble, NASA's Earth Observatory.
A0 sized .pdf downloadable from the web.

Tags: AU-WA, Administrative Boundaries, Administrative Boundary, Earth Sciences, Marine Jurisdiction, Published_External, Thematic Map, bathymetry, marine
Organization: Geoscience Australia Data
Manganese nodules from the Tasman Sea off Sydney

Two manganese nodules were recently recovered by HMAS Kimbla from a water depth of 4300 m, in a northeast-trending trough about 250 nautical miles southeast of Sydney (155Â° 35E. 36Â° 15S). They were associated with greenish gray calcareous mud laid down below the lysocline, but above the carbonate compensation depth. The nodules are subspherical and about 10 cm in diameter, and have a high clay content, a low Mn:Fe ratio, and low contents of Ni (0.25%), Cu (0.17%) and Co (0.06%).

Tags: AUS, Earth Sciences, GA Publication, Journal, Published_External, marine
Organization: Geoscience Australia Data