geoscience
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The main objective of this study is to test the impact of the alignment of solutions for regional GPS networks to the ITRF when applying an inappropriate procedure which is adopted fairly frequently in practice. The progression of ITRF versions is overviewed then, using the analysis of two regional GPS campaigns as case studies, the coordinate differences caused by applying the inappropriate procedure for reference frame alignment are presented. The results of the comparative studies show that coordinate differences in the order of a few millimetres to some centimetres can be caused by using inconsistent reference frames for the reference station coordinates and the IGS satellite orbits. Subsequent analysis demonstrates that there are no significant coordinate differences introduced when applying different subsets of IGS reference stations to link the regional GPS network to ITRF.
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AGSOREFS is a shared bibliographic database designed to serve two main purposes. First, it is intended to serve as a single reference pool for all AGSO relational geoscience databases, replacing a number of earlier reference systems. Its standardised references can be displayed from any Oracle database via a unique reference ID. Second, it is designed to function as a pooled reference system for all AGSO staff members. Users can select from it the references they want in their private lists, and can attach their own IDs and keywords. The menus, screen forms and reports used to input and view references, keywords, etc., are described in detail. Definitions of most fields in the database are given in some depth under descriptions of the screen forms - providing, in effect, a comprehensive data dictionary of the database. The database schema, with all definitions of tables, views and indexes is listed in an appendix to the guide. Instructions are given in a second appendix on how to parse and bulk-load references from documents and other databases.
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Legacy product - no abstract available
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This interactive map is an output of the Burdekin-Fitzroy Project 2003-2004, a cooperative project by the Regolith and Land Use research area of Geoscience Australia, Queensland's Department of Natural Resources, Mines and Energy and the Cooperative Research Centre for Landscape Environments and Mineral Exploration (CRCLEME). Over the past 10-15 years it has become clear that there is considerable potential for the use of geophysical techniques for Natural Resource Management (NRM). Most of these techniques have been developed for mineral exploration and for use in the geosciences for geological and regolith mapping, among other things. This in turn has led to the recognition that geoscience data and information have considerable potential to enhance planning for NRM, and perhaps the best way to do this is through collaborative and multidisciplinary projects. There is a lot of relevant geoscience information available from Geoscience Australia and State/NT Geological Surveys that has not been looked at from an NRM perspective because there has not been any "driver". This project addresses this situation in a limited manner through a collaborative demonstration project in the upper Burdekin/Fitzroy catchments. The project was set up to work under the National Geoscience Agreement with the Queensland Dept of Natural Resources and Mines (QDNRM), and CRC LEME. The aim was to produce a catalogue of the data and information relevant to NRM that is available for the region. The aim was also to identify key knowledge gaps that should be filled, and provide a basis for rational and rapid decisions on, for example, whether and where airborne electromagnetic (AEM) surveys and complementary ground-truth would be beneficial. This GIS and an accompanying report are the outputs from this project. The GIS is not designed as a planning tool, but rather as an on-line catalogue of available data and information.
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***Removed by request Ollie Raymond 6/03/2019*** <p>Legacy product - no abstract available</p>
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Package comprises a digital compilation of regional mapping of Bathurst (SI5508) 1:250 000 map by AGSO and NSW Department of Mineral Resources, under NGMA from 1991 to 1996.
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The world is turning to the minerals sector to meet sustainable development goals on the path to net zero emissions, buoyed by modern manufacturing. Discovery and development of new and varied mineral deposits is essential to reach these goals. However, despite concerted efforts, exploration success rates are in decline globally. To provide an advantage to Australia’s mineral sector, the Australian Government has significantly invested in precompetitive geoscience to unlock both geographic and conceptual frontiers for further exploration and discovery by private industry. Over the last decade, Geoscience Australia, in collaboration with state/territory geological surveys and academia, has undertaken geoscience data acquisition and analysis at an unprecedented scale aligned with UNCOVER initiative through programs like Exploring for the Future. This strategic move has reversed Australia’s declining market share of global exploration investment, stimulated new minerals industries, led to the discovery of world-class mineral deposits, and opened new undercover provinces for exploration. Here, I highlight some key successes, consider some key challenges, and suggest a future direction for precompetitive geoscience. Australia is at the forefront of mineral systems science underpinned by world-leading standardised national geological and geophysical (i.e. potential field) data coverages. Acquired at increasing resolution over decades, they have been at the vanguard of mineral exploration as they effectively map lateral geological changes yet provide limited and non-unique insights with depth. Recognising mineral deposits are the consequence of large geological systems, a critical step change in the last decade has been a focus on extensive first-pass or framework 3D imaging of the Australian continent through the systematic collection of magnetotelluric (AusLAMP), passive seismic (AusArray) and airborne electromagnetic (AusAEM) data, supplemented by higher fidelity deep reflection seismic profiles. Aided by significant advances in geophysical processing, Bayesian inference and big data analytics, when integrated with classic geoscience these datasets are revealing new first-order controls on mineralisation and identifying new exploration opportunities. Examples include discovery of lithospheric thickness controls on sediment-hosted base-metal deposits, clear scale reduction approaches to targeting iron oxide-copper-gold systems using electrical methods and mapping source rocks of hydrothermal systems. Using statistical modelling, the predictive power of each dataset or derivative can be assessed allowing an unbiased national view of Australia’s mineral potential to emerge. Importantly, these advances are coupled with recommencement of stratigraphic drilling programs to test inference and demonstrably reduce risk of exploring in frontier regions. Systematic quantitative mineral potential analysis rapidly highlights the importance of data consistency, completeness, and the robustness of validation datasets and in so doing reaffirms the critical role geological surveys play as custodians of this information. The diversification of mineral demand to include critical minerals has both leveraged this information to identify new types of mineral deposits but also highlights the youthfulness of mineral systems science. In response there are growing international efforts to grow understanding of minerals systems science for all elements to enable exploration for critical minerals and realise secondary prospectivity of mine waste. The wave of 3D imaging of Australia is developing a framework 3D digital twin and national scale mineral potential models are emerging. The challenge for precompetitive geoscience is to strategically infill this coverage to further accelerate exploration and development by industry. However, given competing land use claims and increasing environmental, social and governance (ESG) requirements on the minerals sector, success requires a common understanding of subsurface geology across minerals, energy and groundwater industries, which dovetails with surficial, social and governance datasets. Delivery of such integrated subsurface understanding is an exciting and vital challenge for geological surveys and their collaborators.
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ODP drilling in Prydz Bay by Leg 119 (1988) and Leg 188 (2000) investigated Cainozoic paleoenvironments of the continental shelf, slope and rise. Drilling on the shelf reveal a pre-glacial alluvial or delta plain system covering the Prydz Bay basin -- a plain characterized by austral conifer woodland in Late Cretaceous that changed to Nothofagus rainforest scrub by mid to late Eocene time. Evidence of mountain glaciation in late Eocene time is seen in sand grain textures in channel sands. Interbedded clays and sands and an increase in marine dinoflagellates signals a marine transgression of the delta plain. In the late Eocene to early Oligocene, Prydz Bay shifted from being a fluvio-deltaic complex with vegetation to a marine continental shelf environment. The transition is marked by a sequence boundary and marine flooding surface onlapped by glaciomarine muds with dropstones that denote the first appearance of floating ice on the shelf, followed by diamicts that contain shelly fossils. No core exists for early Oligocene to early Miocene times, and seismic data suggest the transition from shallow to normal depth, prograding continental shelf, with submarine canyons on the slope and channel/levees on the rise. Cores from the continental rise provide evidence of a Neogene long-term (m.y.) decrease in sedimentation rates and short-term (Milankovitch periods) cyclicity between principally biogenic and terrigenous sediment supply due possibly to cyclic changes in onshore glaciers and related changes in ocean circulation. Mid Miocene times saw more-rapid slowing of sedimentation rates, a shift to enhanced IRD, and changes in clays and other minerals. These transitions result from enhanced glacial erosion of onshore and shelf source areas and reduced input from glacial meltwater as the ice became progressively colder. The Early Pliocene saw the deposition of overcompacted glacial diamictons on the shelf, and bank/trough morphology produced by formation of an ice stream ice in western Prydz Bay. Debris flows formed a trough mouth fan on the continental slope. Compositional changes in the trough mouth fan suggests peak erosion and therefore possibly peak ice volumes at about 1.1 Ma. Late Pleistocene times (post 780 ka.) saw a reduction in frequency of extreme advances by the main ice drainage system, in response to reduced precipitation accompanying cooling, extreme erosion of the inner shelf and changes in the interaction of the ice sheet response time and the prevailing climate cycle length. These changes probably reflect the overall cooling of the Antarctic from non-glacial, to restricted temperate glaciers to poly thermal ice sheet to the present cold based ice sheet. Superimposed on this overall cooling trend are pulses of warmer conditions, indicated by beds of warmer water nannoplankton and changes diatom assemblages
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Subset of Rockchem whole-rock database release 3. Contains 2439 whole-rock analyses of rocks from the Mount Isa Inlier and Georgina Basin.
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In collaboration with the relevant State Geological Surveys and Phil Blevin of Petrochem Consultants, Geoscience Australia is coordinating in a new project to assess the metallogenic potential of major Australian Phanerozoic granite suites and their associated host rocks in Eastern Australia. The project will use the methodology of previous GA/AGSO projects (Budd et al., 2001; Champion, & Heinemann, 1994) and industry-sponsored projects (AMIRA projects P147B, P425, P515) and will synthesise publicly available geoscience datasets to provide a better basis for targeting potential of granite-related Au base metal mineralisation. The goal of the project is to assist companies investigating new deposit styles, in particular the recently proposed model for Intrusion-related gold.