Southern Thomson Orogen VTEM Airborne Electromagnetic Survey - Final Data

The Southern Thomson Orogen VTEM-plus® Airborne Electromagnetic Survey was conducted by Geoscience Australia as part of a collaborative project with its partners the Geological Survey of New South Wales and the Geological Survey of Queensland. The Survey contributes to the Australian Academy of Science's UNCOVER Initiative and Geoscience Australia's response to this as part of the National Mineral Exploration Strategy.Geoscience Australia contracted Geotech Airborne Ltd to acquire VTEM-plus® airborne electromagnetic (AEM) data over part of the Southern Thomson Orogen in Queensland and New South Wales in April and May 2014. The data were also processed by Geotech Airborne Ltd using its FullWaveForm® processing techniques.The survey is designed to assess the under-cover geology and prospectivity of the Southern Thomson Orogen around Hungerford and Eulo and straddles the New South Wales-Queensland border. The survey comprises two parts:1.    A regular regional survey on 5000 m spaced East-West lines totalling 3352 line km and covering an area of 16 261 km2.2.    Two regional traverses adjacent various roads totalling 915 line km.The Southern Thomson Orogen is a priority area for mineral systems research. Much of the area lies underneath cover of sedimentary basins and is a poorly-understood element of Australia's geology. The Orogen contains Cambro-Ordovician rocks that have potential for Iron Oxide Copper-Gold (IOCG) resources, porphyry copper-gold and Volcanic-Hosted Massive Sulphide (VHMS) deposits. Survey data will add to knowledge of cover thickness and character and will inform future geological mapping in the region.The Southern Thomson Orogen VTEM-plus® AEM Survey data release includes the final contractor supplied (Phase 1) datasets AEM survey. The data will be available from Geoscience Australia's web site free of charge:http://www.ga.gov.au/about/what-we-do/projects/minerals/current/continental-geophysics/airborne-electromagneticsThe data release package includes:1.    Point-located electromagnetic dB/dt and derived B-field data with associated position, altimeter, orientation, magnetic gradiometer, and derived ground elevation data. These data are in ASCII column format with associated README and ASEG-GDF2 header files. The dataset consists of a separate download file for the: a.    Main survey block Part 1 (flight lines 1000-1171) b.    Main survey block Part 2 (flight lines 1180-1360) c.    Traverse lines (flight lines 3000-3006 and 4000-4007) d.    Repeat lines e.    High altitude lines.2.    Waveform files for every flight containing the 192 kHz sampling of the transmitter current and receiver waveforms.3.    Point-located conductivity estimates derived using the EM Flow® conductivity depth imaging (CDI) algorithm with associated position, altimeter, orientation, magnetic gradiometer, and derived ground elevation data. Data include the conductivity estimate for each 5 m interval and selected depth slices. These data are in ASCII column format with associated README and ASEG-GDF2 header files. All regular survey, traverses and repeat lines are included in a single download file.4.    Gridded data, at 1 km cell size in, for the conductivity depth slices derived from the EM Flow® CDI data, magnetics and elevation data in ER Mapper® binary raster grid format with associated header files.5.    Graphical multiplots, in PDF format, for each flight line showing EM Flow® CDI sections and profiles of Z-component dB/dt data, magnetics, powerline monitor, height and orientation data.6.    Operations Report.7.    ESRI shapefiles and KML files of flight lines.8.    Metadata and License files.

南汤普森造山带（Southern Thomson Orogen）VTEM-plus®航空电磁测量由澳大利亚地质调查局（Geoscience Australia）联合新南威尔士州地质调查局与昆士兰州地质调查局合作开展，隶属于澳大利亚科学院UNCOVER计划，同时作为澳大利亚地质调查局响应《国家矿产勘探战略》的相关工作内容。
2014年4至5月，澳大利亚地质调查局委托Geotech Airborne有限公司，在昆士兰州与新南威尔士州境内的部分南汤普森造山带区域采集VTEM-plus®航空电磁（Airborne Electromagnetic, AEM）数据，并由该公司采用FullWaveForm®处理技术完成数据处理工作。
本次测量旨在评估亨福德（Hungerford）与尤洛（Eulo）周边南汤普森造山带的隐伏地质情况与成矿潜力，测量区域横跨新南威尔士州与昆士兰州州界。整个测量项目包含两部分：
1. 采用5000米间距东西向测线布设的常规区域测量，总测线长度3352千米，覆盖面积16261平方千米；
2. 沿多条道路布设的两条区域测线，总测线长度915千米。
南汤普森造山带是矿产系统研究的优先区域，该区域大部分被沉积盆地覆盖，是澳大利亚地质认知程度较低的组成部分。造山带内产出寒武-奥陶纪地层，具备发育铁氧化物铜金型（Iron Oxide Copper-Gold, IOCG）矿床、斑岩型铜金矿床以及火山岩型块状硫化物（Volcanic-Hosted Massive Sulphide, VHMS）矿床的潜力。本次测量数据将有助于提升对覆盖层厚度与特征的认知，为该区域后续地质填图工作提供科学依据。
本次发布的南汤普森造山带VTEM-plus®航空电磁测量数据包含承包商提交的第一阶段最终航空电磁测量数据集。相关数据可通过澳大利亚地质调查局官网免费获取：http://www.ga.gov.au/about/what-we-do/projects/minerals/current/continental-geophysics/airborne-electromagnetics
本次数据发布包包含以下内容：
1. 带位置、高度计、方位、磁梯度计及推导地面高程数据的点位式电磁dB/dt与衍生B场数据。该类数据采用ASCII列格式存储，附带README文档与ASEG-GDF2格式头文件。数据集分为以下独立下载文件：
a. 主测量区块第一部分（测线编号1000-1171）
b. 主测量区块第二部分（测线编号1180-1360）
c. 测线（测线编号3000-3006与4000-4007）
d. 重复测线
e. 高空测线。
2. 各飞行航线的波形文件，包含发射机电流与接收机波形的192kHz采样数据。
3. 采用EM Flow®电导率深度成像（Conductivity Depth Imaging, CDI）算法推导的点位式电导率估算数据，附带位置、高度计、方位、磁梯度计及推导地面高程数据。该数据包含每5米间隔与选定深度切片的电导率估算值，采用ASCII列格式存储，附带README文档与ASEG-GDF2格式头文件。所有常规测量、测线与重复测线数据均整合至单个下载文件中。
4. 基于EM Flow®电导率深度成像数据、磁测数据与高程数据推导的电导率深度切片栅格数据，栅格单元尺寸为1千米，采用ER Mapper®二进制栅格格式存储，附带头文件。
5. 各飞行航线的PDF格式多图图形文件，包含EM Flow®电导率深度成像剖面、Z分量dB/dt数据、磁测数据、电力线监测数据、高度与方位数据的剖面展示。
6. 作业报告。
7. 飞行航线的ESRI形状文件与KML文件。
8. 元数据与授权文件。