AndreaBozzo/ceres-open-data-index huggingface dataset:
Analysis and 3D visualisation of new compilations of potential field data to help constrain 3D models

The accuracy of broad-scale geological models and interpretations derived from gravity and airborne magnetic data is dependent upon long wavelength components of the data, which are in turn dependent upon the accuracy with which separate datasets are merged into single compilations. For magnetic data, a newly developed method (Minty, 2000) reduces this complex procedure to a single least-squares problem involving adjustments to all grids. The method has been tested using independent datasets for several regions across Australia (Milligan et al., 2001). For gravity data, Murray (1998) developed optimal gridding. Examples of derived potential field products and enhanced images are presented here for new compilations of airborne magnetic and gravity data for the north-eastern Gawler Craton (NEGC) in South Australia. In one example, directional filtering removes anomalies of the Gairdner Dyke Swarm, considerably enhancing features in the Gawler Range Volcanics.
Application of automatic trend analysis and edge detection to merged compilations of potential field data are useful techniques for producing unbiased estimates of sharp lateral changes in physical properties of rocks (e.g. Blakely &amp; Simpson, 1986; Phillips, 1997). A new method of edge detection (Archibald et al., 1999) for the analysis of magnetic and gravity data uses wavelet theory to identify points lying on the horizontal gradient maxima. Points calculated from these methods are aligned along the gradients, and have the appearance of continuous "worms". When the points generated for many levels of upward continuation of the original data are analysed in 3D, the worms provide information about the strength of the gradients, the localities of source-body edges, their depths, and their dip directions. For automatic analysis, it is more convenient if the worm points are converted into sets of vectors, or, further, into 3D surfaces (sheets) for each level of continuation. Examples are shown for the NEGC and for the Arunta area of the Northern Territory, where, in some cases, the orientation of discrete physical property contrasts are mapped.
A useful analytical technique is to compute the best-fitting straight line for those worm vectors that have a reasonable linearity, and to plot rose diagrams of the orientation of the vectors. The results may be displayed either by their lengths and directions or as histograms of their directions. Discrete areas can be windowed separately to show how dominant trend directions change in different geological settings. Rose diagrams calculated for many levels of upward continuation may show how fracture sets vary vertically, both with changing dip and strike directions. Visualisation of this information provides useful constraints on 3D geological models. An example is the mapping of structural geology of basement for the NEGC.

Tags: Earth Sciences, GA Publication, Poster/Image, Published_External, geophysics
Organization: Geoscience Australia Data
BMR Research Newsletter 13

Titles in this newsletter:
Triassic and Jurassic carbonate buildups on the Exmouth Plateau
Kosciusko geological map heralds new parks mapping project
Mapping the offshore Maryborough Basin aboard RV Rig Seismic
Otway Basin petroleum accumulations study completed
Distributed image processing at BMR
A new method of dating Australian Precambrian rocks: Accumulated polar wander
The Kakadu GIS
High platinum potential in the Lachlan Fold Belt
Geochemical discrimination of mafic layered units, eastern Pine Creek Inlier
ORGCHEM organic geochemistry database
New publications on the Amadeus Basin available soon
ODP Leg 121 palaeomagnetism gives new insights into the evolution of Broken Ridge, Ninetyeast Ridge, and the Himalayan collision model
Publications and data released during the period 1 March 1990 - 1 September 1990
Bowen Basin tectonic models tested by BMR deep seismic profiles
New stable-isotope facility
Petroleum source-rock assessment and hydrocarbon generation terrigenous sequences

Tags: Earth Sciences, GA Publication, Published_External, Research Newsletter
Organization: Geoscience Australia Data
Sediment characteristics influencing benthic biodiversity across a tropical sediment-starved shelf affected by seepage: Insights from cluster analysis of baseline physical and geochemical variables

Geoscience Australia undertook seabed mapping surveys in the eastern Bonaparte Gulf in 2009/2010 to deliver integrated 
information relevant to marine biodiversity conservation and offshore infrastructure development. The survey objectives were to characterise the physical, chemical and biological properties of the seabed, document potential geohazards and identify unique or sensitive benthic habitats. Different clustering methods were applied to a 124 sample dataset comprising 74 physical and chemical variables which convey important baseline information about sediment sources, carbon reactivity/ redox and sedimentary environments. Results of the UPGMA clustering method were interpreted due to the high cophenetic correlation (0.82), and these clusters discriminated infauna better than clusters based on geomorphology. Major geochemical dimensions evident amongst clusters included grain-size and a cross-shelf transition from Mn and as enrichment (inner shelf) to P enrichment (outer-shelf). Higher P was due to enhanced authigenic-P accumulation. 
Sponge/gorgonian occurrences were constrained by low Nd/Sr (pointing to a diminishing terrestrial source) and relatively high δ15N, and subsurface seepage was shown to enhance the ‘terrestrial’ (e.g. rare-earth element and Si) signature in outer-shelf sediments. Sponge-dominated shallow bank/terrace clusters with abundant reactive organic matter differentiated on the basis of Si-Al relations (and redox). These habitats shed materials to peripheral Gorgonian-dominated scree environments which had surface-area normalised TOC concentrations that were elevated over usual continental shelf ranges. Trichodesmium were identified as an important source of carbon to inner-shelf plains. Pair-wise ANOSIM results for infauna are brought together in a summary model which highlights the influence of the clusters on benthic biodiversity.
Abstract presented at the AMSA2013 Golden Jubilee Conference 7-11 July 2013 Gold Coast, Qld.

Tags: AU-NT, Earth Sciences, External Publication, Published_Internal, continental shelf, geochemistry, habitat, marine, marine biodiversity
Organization: Geoscience Australia Data
Seismic travel-times to east Papua from USSR nuclear explosions

Recordings of P seismic waves from a Novaya Zemlya nuclear explosion at 26 sites on the east Papuan peninsula show that there are significant apparent departures (residuals) from travel-times calculated using average earth models. The residual at Port Moresby (PMG) differs by between +0.3 and +0.5 seconds from previous attempts to assign a station effect there. Without precise times and locations of the Novaya Zemlya events it is not possible to determine the proportions of the residual due to source effects and velocity anomalies in the mantle. It is shown that complex crustal structure in the east Papuan region accounts for a significant proportion of the station residuals, which differ from the PMG residual by between -0.72 seconds and +1.41 seconds. There is a tendency towards more negative residuals on the northeast side of the Papuan peninsula.

Tags: Earth Sciences, GA Publication, Journal, PNG, Published_External
Organization: Geoscience Australia Data
Geochemical map of Australia (First Edition) - Lu (lutetium) series

Map(s) of Lu (lutetium) concentration (Total content, Aqua Regia soluble content, and/or Mobile Metal Ion soluble content) in Top Outlet Sediment (TOS) and/or Bottom Outlet Sediment (BOS) samples, dry-sieved to &lt;2 mm and/or &lt;75 um grain size fractions. Source: The Geochemical Atlas of Australia (Caritat and Cooper, 2011)

Tags: AU, Earth Sciences, Geoscience, Published_External, Thematic Map, geochemistry, mapping, regolith
Organization: Geoscience Australia Data
AUSGeoid98 v.1.0 data files: Katherine (sd53-09)

AUSGeoid98 data files contain a 2 minute grid of AUSGeoid98 data covering the Australian region, which you can use to interpolate geoid-ellipsoid separations for the positions required.You can use your own interpolation software, or you can use Geoscience Australia's Windows Interpolation software (Winter). The data files are text files in a standard format that cover the same area as standard topographic map areas. Files covering both 1:250,000 (approximately 100 x 150 km) and 1:1,000,000 (approximately 400 x 600 km) map areas are available. There is a 4 minute overlap on all sides of each area. Data format: AUSGeoid98 data files have a header record at the start of each file, to distinguish them from the superseded AUSGeoid93 data files. AUSGeoid98 data files show the geoid-ellipsoid separation to 3 decimal places, while the superseded AUSGeoid93 data files showed only 2 decimal places. AUSGeoid98 deflections of the vertical were computed from the geoid-ellipsoid separation surface, while the AUSGeoid93 deflections of the vertical were computed from OSU91A.

Tags: AU, AUSGeoid98, Geodesy, Geodetic Data, Published_External, dataset, geodesy
Organization: Geoscience Australia Data
Nullarbor 1:50 000 topographic map

Product Specifications Coverage: Partial coverage, predominantly in northern Australia, along major transport routes, and other selected areas. About 1000 maps have been published to date. Currency: Ranges from 1968 to 2006. Coordinates: Geographical and UTM. Datum: AGD66, new edition WGS84; AHD. Projection: Universal Transverse Mercator UTM. Medium: Paper, flat copies only.

Tags: AU-SA, Orthophoto Map, Published_External, Topographic Map, Topology, topography
Organization: Geoscience Australia Data
Numbulwar 1:50 000 topographic map

Product Specifications Coverage: Partial coverage, predominantly in northern Australia, along major transport routes, and other selected areas. About 1000 maps have been published to date. Currency: Ranges from 1968 to 2006. Coordinates: Geographical and UTM. Datum: AGD66, new edition WGS84; AHD. Projection: Universal Transverse Mercator UTM. Medium: Paper, flat copies only.

Tags: 50K scale, AU-NT, Published_External, Topographic Map, Topology, topography
Organization: Geoscience Australia Data
Wells 1:250 000 topographic map

This map is part of the series that covers the whole of Australia at a scale of 1:250 000 (1cm on a map represents 2.5 km on the ground) and comprises 513 maps. This is the largest scale at which published topographic maps cover the entire continent. Each standard map covers an area of 1.5 degrees longitude by 1 degree latitude or about 150 kilometres from east to west and 110 kilometres from north to south. There are about 50 special maps in the series and these maps cover a non-standard area. Typically, where a map produced on standard sheet lines is largely ocean it is combined with its landward neighbour. These maps contain natural and constructed features including road and rail infrastructure, vegetation, hydrography, contours (interval 50m), localities and some administrative boundaries. The topographic map and data index shows coverage of the sheets. Product Specifications Coverage: The series covers the whole of Australia with 513 maps. Currency: Ranges from 1995 to 2009. 95% of maps have a reliability date of 1994 or later. Coordinates: Geographical and either AMG or MGA (post-1993) Datum: AGD66, GDA94, AHD. Projection: Universal Traverse Mercator (UTM) Medium: Paper, flat and folded copies.

Tags: 250K scale, AU-SA, Published_External, Topographic Map, Topology, topography
Organization: Geoscience Australia Data
WA tsunami inundation modelling, Geraldton to Dunsborough, model outputs in GIS format

A zip folder is provided containing key model outputs (in GIS formats) for the study "WA tsunami inundation modelling, Geraldton to Dunsborough".

 NOTE FOR WINDOWS USERS:The default Windows unzip tool currently fails to extract this folder, however, it works if you use a dedicated unzip program (such as 7-zip: https://7-zip.org/)

Tags: Earth system sciences, Published_External, Western Australia, probabilistic hazard assessment, tsunami
Organization: Geoscience Australia Data
Multielement composition of the conodont Icriodus expansus Branson and Mehl from the Upper Devonian of the Canning Basin, Western Australia

The apparatus structure of the conodont Icriodus expansus Branson and Mehl is here recognised as consisting of seven element types-  I, Ca, Cb, Cc, Cd, Ce and Cf. The apparatus contains one pair of I elements and over 140 associated cone elements. The orientation of the I element is reversed. The study is based on a large collection of fused clusters found in a sample from the Upper Devonian (Frasnian) Napier Formation in the Oscar Range of the Canning Basin, Western Australia.

Tags: Earth Sciences, GA Publication, Journal, Published_External, WA
Organization: Geoscience Australia Data
Alinerta 1:100 000 unpublished topographic map

At this scale 1cm on the map represents 1km on the ground. Each map covers a minimum area of 0.5 degrees longitude by 0.5 degrees latitude or about 54 kilometres by 54 kilometres. The contour interval is 20 metres.

Tags: 100K unpublished, AU-SA, Published_External, Topographic Map, Topology
Organization: Geoscience Australia Data
Geoscience Australia Exploring for the Future Upper Burdekin Project: Stratigraphic and Monitoring Bore Drilling Program

This technical report details the methods and results the drilling programs of the Upper Burdekin Groundwater Project conducted as part of Exploring for the Future (EFTF)—an eight year, $225 million Australian Government funded geoscience data and information acquisition program focused on better understanding the potential mineral, energy and groundwater resources across Australia. 
This report was written by Queensland Government collaborators in the Department of Environment and Science, and is published here as supplied to Geoscience Australia at the conclusion of the project. The drilling program itself was conducted by the Department of Environment and Science as part of the Upper Burdekin Groundwater Project. 
A total of 17 holes were drilled in 2017-18 at 13 sites with a total combined depth of 943.2 metres. These comprise selected locations across both the Nulla Basalt Province and McBride Basalt Province. A network of 15 monitoring bores were constructed with two test holes backfilled and decommissioned.

Tags: Australia, BURDEKIN RIVER, Basalt, Basaltic aquifer, Burdekin River catchment, Countries | Australia, EARTH SCIENCES, EFTF, Exploring for the Future, Fractured Rock Aquifer, GEOLOGY, Groundwater, Hydrogeology, McBride Basalt Province, North Queensland, Nulla Basalt Province, Published_External, QUEENSLAND, Regional Hydrogeology, States, Territories (Australia) | Queensland, Upper Burdekin, Upper Burdekin Groundwater Project, Volcanology, borehole drilling, groundwater bore, monitoring bore, stratigraphic drilling, volcanic hydrogeology
Organization: Geoscience Australia Data
AUSGeoid98 v.1.0 data files:  (sg57)

AUSGeoid98 data files contain a 2 minute grid of AUSGeoid98 data covering the Australian region, which you can use to interpolate geoid-ellipsoid separations for the positions required.You can use your own interpolation software, or you can use Geoscience Australia's Windows Interpolation software (Winter). The data files are text files in a standard format that cover the same area as standard topographic map areas. Files covering both 1:250,000 (approximately 100 x 150 km) and 1:1,000,000 (approximately 400 x 600 km) map areas are available. There is a 4 minute overlap on all sides of each area. Data format: AUSGeoid98 data files have a header record at the start of each file, to distinguish them from the superseded AUSGeoid93 data files. AUSGeoid98 data files show the geoid-ellipsoid separation to 3 decimal places, while the superseded AUSGeoid93 data files showed only 2 decimal places. AUSGeoid98 deflections of the vertical were computed from the geoid-ellipsoid separation surface, while the AUSGeoid93 deflections of the vertical were computed from OSU91A.

Tags: AU, AUSGeoid98, Geodesy, Geodetic Data, Published_External, dataset, geodesy
Organization: Geoscience Australia Data
Murranji 1:100 000 unpublished topographic map

At this scale 1cm on the map represents 1km on the ground. Each map covers a minimum area of 0.5 degrees longitude by 0.5 degrees latitude or about 54 kilometres by 54 kilometres. The contour interval is 20 metres.

Tags: 100K unpublished, AU-NT, Published_External, Topographic Map, Topology
Organization: Geoscience Australia Data
Meandarra 1:100 000 topographic map

At this scale 1cm on the map represents 1km on the ground. Each map covers a minimum area of 0.5 degrees longitude by 0.5 degrees latitude or about 54 kilometres by 54 kilometres. The contour interval is 20 metres. Many maps are supplemented by hill shading. These maps contain natural and constructed features including road and rail infrastructure, vegetation, hydrography, contours, localities and some administrative boundaries. Product Specifications Coverage: Australia is covered by more than 3000 x 1:100 000 scale maps, of which 1600 have been published as printed maps. Unpublished maps are available as compilations. Currency: Ranges from 1961 to 2009. Average 1997. Coordinates: Geographical and either AMG or MGA coordinates. Datum: AGD66, GDA94; AHD Projection: Universal Transverse Mercator UTM. Medium: Printed maps: Paper, flat and folded copies. Compilations: Paper or film, flat copies only.

Tags: 100K scale, AU-QLD, Published_External, Topographic Map, Topology, topography
Organization: Geoscience Australia Data
Winnecke Creek 1:250 000 topographic map

This map is part of the series that covers the whole of Australia at a scale of 1:250 000 (1cm on a map represents 2.5 km on the ground) and comprises 513 maps. This is the largest scale at which published topographic maps cover the entire continent. Each standard map covers an area of 1.5 degrees longitude by 1 degree latitude or about 150 kilometres from east to west and 110 kilometres from north to south. There are about 50 special maps in the series and these maps cover a non-standard area. Typically, where a map produced on standard sheet lines is largely ocean it is combined with its landward neighbour. These maps contain natural and constructed features including road and rail infrastructure, vegetation, hydrography, contours (interval 50m), localities and some administrative boundaries. The topographic map and data index shows coverage of the sheets. Product Specifications Coverage: The series covers the whole of Australia with 513 maps. Currency: Ranges from 1995 to 2009. 95% of maps have a reliability date of 1994 or later. Coordinates: Geographical and either AMG or MGA (post-1993) Datum: AGD66, GDA94, AHD. Projection: Universal Traverse Mercator (UTM) Medium: Paper, flat and folded copies.

Tags: 250K scale, AU-NT, Published_External, Topographic Map, Topology, topography
Organization: Geoscience Australia Data
The search for a more realistic metallogenic map format, with reference to the Pine Creek Geosyncline

The format of most existing metallogenic maps is not adequate for scales of 1:500 000 or less. The major problem is the colourful out-of-scale locality symbols, which mask the map detail in the most important areas, the immediate vicinity of the ore occurrences.  The design of the symbols is also a problem, most being influenced considerably by genetic interpretations that are subjective and change with time; they are incapable of expressing transitionality, correlation of metallogenetic and lithogenetic events, and they cannot accommodate incomplete information. A substantially different philosophy of metallogenic mapping has been tested using the Pine Creek Geosyncline as an example. Ideally, the product would be a set of three matching maps. Map 1 would be a base map, a modified geological map that consistently shows the age of units by colour and the lithology of units by pattern, regardless of genesis and the level of emplacement. Mineralised occurrences would be identified in the simplest way possible, so as not to obscure the background information.  Map 2 would be a gitological map, or map of mineral deposits, providing information on the geological properties of occurrences. The symbols suggested are based on simplified geological cross-sections, and are colour and pattern coordinated with the base map, to give the reader an immediate impression about the contemporaneity of rock-and ore-forming events and of the hosts to the ore. Within the symbol framework for a given mineralisation style, a wide range of properties of individual occurrences can be shown, and unknown information can be truthfully expressed as a blank component of the symbol.  Map 3 would be a commodity map, showing the ore metals, their individual and total accumulations, and the concentration of the major metal.

Tags: Earth Sciences, GA Publication, Journal, NT, Published_External
Organization: Geoscience Australia Data
Streaky Bay - TMI grid (AWAGS)

Total magnetic intensity (TMI) data measures variations in the intensity of the Earth's magnetic field caused by the contrasting content of rock-forming minerals in the Earth crust. Magnetic anomalies can be either positive (field stronger than normal) or negative (field weaker) depending on the susceptibility of the rock. The data 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 Streaky Bay - TMI grid (AWAGS) has a cell size of 0.0004 degrees (approximately 41m). The units are in nanoTesla (or nT). The data used to produce this grid was acquired in 2018 by the SA Government, and consisted of 90670 line-kilometres of data at 200m line spacing and 60m terrain clearance. To constrain long wavelengths in the grid, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey grid.

Tags: AWAGS, Australia, EARTH SCIENCES, Earth sciences, GADDS2.0, NCI, Published_External, SA, TMI, airborne digital data, geophysical survey, geophysics, grid, mag, magnetics, magnetism, palaeomagnetism, raster, survey 1308, total magnetic intensity
Organization: Geoscience Australia Data
Nangus 1:50 000 topographic map

Product Specifications Coverage: Partial coverage, predominantly in northern Australia, along major transport routes, and other selected areas. About 1000 maps have been published to date. Currency: Ranges from 1968 to 2006. Coordinates: Geographical and UTM. Datum: AGD66, new edition WGS84; AHD. Projection: Universal Transverse Mercator UTM. Medium: Paper, flat copies only.

Tags: 50K scale, AU-QLD, Published_External, Topographic Map, Topology, topography
Organization: Geoscience Australia Data
Esperance Special 1:250 000 GIS Dataset

This data is part of the series of maps that covers the whole of Australia at a scale of 1:250 000 (1cm on a map represents 2.5km on the ground) and comprises 513 maps. This is the largest scale at which published topographic maps cover the entire continent. 
Data is downloadable in various distribution formats.

Tags: 250K scale, AU-WA, Earth Sciences, GIS Dataset, Published_External, dataset, topography
Organization: Geoscience Australia Data