Research Article| November 01, 1987 Timing the breakup of a Proterozoic supercontinent: Evidence from Australian intracratonic basins John F. Lindsay; John F. Lindsay 1Division of Continental Geology, Bureau of Mineral Resources, P.O. Box 378, Canberra, ACT 2601, Australia Search for other works by this author on: GSW Google Scholar R. J. Korsch; R. J. Korsch 1Division of Continental Geology, Bureau of Mineral Resources, P.O. Box 378, Canberra, ACT 2601, Australia Search for other works by this author on: GSW Google Scholar John R. Wilford John R. Wilford 1Division of Continental Geology, Bureau of Mineral Resources, P.O. Box 378, Canberra, ACT 2601, Australia Search for other works by this author on: GSW Google Scholar Geology (1987) 15 (11): 1061–1064. https://doi.org/10.1130/0091-7613(1987)15<1061:TTBOAP>2.0.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation John F. Lindsay, R. J. Korsch, John R. Wilford; Timing the breakup of a Proterozoic supercontinent: Evidence from Australian intracratonic basins. Geology 1987;; 15 (11): 1061–1064. doi: https://doi.org/10.1130/0091-7613(1987)15<1061:TTBOAP>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract In the Late Proterozoic, several broad, shallow, intracratonic depressions appeared across a vast area of central Australia. The basins, which all contain shallow marine to fluvial successions, appear to have been tenuously interconnected through much of their history. Analysis of their fill by means of tectonic-subsidence curves suggests that they are the product of two separate and distinct periods of crustal extension, one at about 900 Ma and a second at about 600 Ma. These extensional episodes were probably the result of failed rifting events that almost fragmented the Australian continent during the Late Proterozoic. The second period of extension almost certainly relates to the breakup of a Proterozoic supercontinent. The results suggest that sediments preserved in the relatively protected environment of interior basins may provide a more subtle record of major tectonic events than continental margin sequences that were exposed to major continental interactions. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
I March 1962 the New Jersey Department of Health formed a committee to advise on the complete and comprehensive modernization of its water and sewage regulations. Two subcommittees were formed, one to develop rules and regulations for water, the other for sewage. The sewage subcommittee found that the existing regulations required some, but not extensive, improvement. The water subcommittee, however, found the existing regulations so inadequate and outmoded that it was necessary to apply a completely new approach to their revision.
Multi-spectral remote sensing has already played an important role in mapping surface mineralogy. However, vegetation - even when relatively sparse - either covers the underlying substrate or modifies its spectral response, making it difficult to resolve diagnostic mineral spectral features. Here we take advantage of the petabyte-scale Landsat datasets covering the same areas for periods exceeding 30 years combined with a novel high-dimensional statistical technique to extract a noise-reduced, cloud-free, and robust estimate of the spectral response of the barest state (i.e. least vegetated) across the whole continent of Australia at 25 m2 resolution. Importantly, our method preserves the spectral relationships between different wavelengths of the spectra. This means that our freely available continental-scale product can be combined with machine learning for enhanced geological mapping, mineral exploration, digital soil mapping, and establishing environmental baselines for understanding and responding to food security, climate change, environmental degradation, water scarcity, and threatened biodiversity.
Digital Soil Mapping and Assessment (DSMA) has progressed from challenging traditional soil science paradigms, through small scale prototyping, to large-scale implementation capturing quantitative measures of soil attributes and functions. This paper considers the future for DSMA in the context of a highly uncertain world where high-quality knowledge of soil dynamics will be important for responding to the challenges of sustainability. Irrespective of whether the need is for survival, increased productivity or broadening the services provided from land management, or simply securing the soil itself, we see DSMA as a fundamental approach and essential tool. With a broadening need and a strong foundation in the practice of DSMA now in place, the theory, tools and technology of DSMA will grow significantly. We explore expected changes in covariate data, the modelling process, the nature of base data generation and product delivery that will lead to tracking and forecasting a much wider range of soil attributes and functions at finer spatial and temporal resolutions over larger areas, particularly globally. Equally importantly, we expect the application and impact of DSMA to broaden and be used, directly and collaterally, in the analysis of land management issues in coming decades. It has the capacity to provide the background to a soil and landscape 'digital twin' and the consequent transformation in monitoring and forecasting the impacts of land management practices. We envision the continued growth of DSMA skills amongst soil scientists and a much broader community of practice involved in developing and utilizing DSMA products and tools. Consequently, there will be a widening and deepening role of public-private partnerships in this development and application.
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