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1

Magnetic Map of the NT (2003)

Date: 2003
Creator: Dept. of Business, Industry & Resource Development, Northern Territry Geological Survey
Datum:
Projection:
Scale: 1:2,500,000
Access: CD-ROM [172]
Description:
Geophysical maps of the Northern Territory NTGS produces four Territory-wide geophysical products: * Magnetic map of the Northern Territory (2004) * Radiometric map of the Northern Territory (2004) * Elevation map of the Northern Territory (2004) * Gravity map of the Northern Territory (2004). These maps represent the culmination of several decades of work since the Bureau of Mineral Resources [BMR, now Geoscience Australia (GA)] first acquired reconnaissance airborne magnetic and radiometric data in the Northern Territory at Rum Jungle in 1952. Dates of first release: Magnetic Map - 2000; Elevation Map - 2002; Radiometric Map - 2003; Gravity Map - 2004. Ninety-one percent of the area of the NT is covered by data from 53 separate NTGS and Geoscience Australia semi-detailed airborne surveys flown since 1974. These data were acquired along flight lines spaced 150-500 m apart. The remaining portion of the NT is made up of reconnaissance BMR surveys, which typically employed flight line spacings of around 1.5-3.2 km. The Magnetic and Radiometric maps make use of data from all 53 surveys, whereas the Elevation Map only includes, where available, GPS-derived height data from surveys flown since 1993. Backdrop to the Elevation Map is provided by the GEODATA 9 Second DEM, resampled to 100 m. The Gravity Map incorporates data primarily from the 11 km grid of stations collected by BMR in the 1960s and 1970s, augmented by many detailed private sector surveys (interpolated to 200 m), two 4 km datasets collected jointly by NTGS and GA in the Tanami and Tennant regions, and more recently (2003) a 2 km airborne dataset. All four maps are updated as new semi-regional surveys are acquired by NTGS and added to the public domain database. They are currently available in several forms: * Hardcopy at 1:2.5M scale. Total Magnetic Intensity, Elevation and Gravity data are rendered in pseudocolour with the intensity stretched and synthetically sun-illuminated. The three elements of Radiometric data, potassium-thorium-uranium, are assigned to red-green-blue, respectively, whereas the intensity is the total count, high-pass filtered. * Digitally, as an ER Mapper .ERS (approximately 700 Mb uncompressed) and MapInfo .TAB, on CD-ROM from the Minerals and Energy Information Centre. Grid-merging of individual datasets has been undertaken using a mesh size of 100 m. * Digitally, as an ER Mapper compressed .ECW (geolocated image) on Image Web Server. Download the: * MapInfo Tab Dataset (2.71MB) * 1:2.5M Elevation Map of the NT, (March 2004) (pdf, 6.13MB) * 1:2.5M Geological Map of the NT, (March 2004) (pdf, 5.13MB) * 1:2.5M Gravity Map of the NT, (March 2004) (pdf, 8.16MB) * 1:2.5M Magnetic Map of the NT, (March 2004) (pdf, 6.49MB) * 1:2.5M Radiometric Map of the NT, (March 2004) (pdf, 19.7MB) Other publications
Metadata and Access Information

2

Tectonic Assemblages of Ontario Seamless Coverage Data Set 11, 1993. (1993)

Date: 1993
Creator: Ontario Geological Survey
Datum: NAD 27
Projection: Lambert Conformal Conic
Scale:
Access: CD-ROM [253] or CD-ROM [263]
Description:
The Tectonic Geology Data Set is a digital interpretation of the Tectonic Geology of the Province of Ontario, It illustrates this by 1) grouping volcanic and sedimentary rock units into tectonic assemblages in Precambrain terrains and depositional sequences in the overlying Paleozoic and Mesozoic sedimentary basins; and 2) interpreting the ranges of emplacement ages of all major intrusions and grouping some plutons into suites. Among a range of tectonically significant features, the map also displays major folds, faults, stratigraphic younging directions, interpreted centres of volcanism and locations of U/Pb age determinations, which are numbered and cross-referenced to a table of ages. This map represents the first attempt internationally to subdivide Archean rock units into Tectonic assemblages, and the first attempt in Ontario to subdivide Paleozic and Mesozoic rock units into depositional sequences. The purpose of this map is to portray the distribution of magmatism and sedimentation in time and space in the rock record of Ontario. The intended user is a geologist with an academic or applied mineral exploration interest in the components of the bedrock of Ontario that forms the basis of its geochronometric and tectonic record.
Metadata and Access Information

3

Wisconsin Potential Field Grids, Derivative Maps & Tectonic Interpretations USGS Open file Report 03-147 (2003 )

Date: 2003
Creator: Daniels, David, S. Synder et al
Datum:
Projection:
Scale:
Access: CD-ROM [178]
Description:
ABSTRACT Principal facts for 40,488 gravity stations covering the entire state of Wisconsin are presented here in digital form. This is a compilation of previously published data collected between 1948 and 1992 from numerous sources, along with over 10,000 new gravity stations collected by the USGS since 1999. Also included are 550 gravity stations from previously unpublished sources. Observed gravity and complete-Bouguer gravity anomaly data for this statewide compilation are included here. Altogether, 14 individual surveys are presented here.
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