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Ordovician Intrusive-related Gold-Copper Mineralization in West-Central new south wales, Australia

Acta Geologica Sinica(English Edition) 2000年第4期74卷 807-826页

作者： David COOKE Centre for Ore Deposit Research University of Tasmania GPO Box 252-79Hobart 7001 Tasmania Australia

Three major types of Ordovician intrusive-related gold-copper deposits are recognized in central-west new south wales, Australia: porphyry, skarn and high sulphidation epithermal deposits. These deposits are mainly distributed within two Ordovician volcano-intrusive belts of the Lachlan Fold Belt: the Orange-Wellington Belt and the Parkes-Narromine Belt. Available isotopic age data suggest that mineralization of the three types of deposits is essentially coeval with the Ordovician intrusive rocks (480-430 Ma).Porphyry gold-copper deposits can be further divided into two groups. The first group is associated with monzonite showing shoshonitic features, represented by Cadia and Goonumbla. The second group is associated with diorite and dacite, including the Copper Hill and Cargo gold-copper deposits. Gold skarn is associated with Late Ordovician (430-439 Ma) monzonitic intrusive complexes in the Junction Reefs area (Sheahan-Grants, Frenchmans, and Cor-nishmens), Endeavour 6, 7 and 44, Big and Little Cadia. The epithermal gold deposits with high sulphidation including Gidginbung (Temora) and Peak Hill mainly occur within Ordovician andesite and volcaniclastic rocks, and are associated with advanced argillic alteration. Available isotopic age data indicate that both alteration and mineralization of the porphyry, skarn and epithermal gold-copper deposits are broadly coeval with the Late Ordovician shoshonitic magmatism, which is thought to result from the melting of sub-continental lithosphere caused by Palaeozoic subduction *** Ordovician intrusive-related gold-copper deposits are restricted to two longitudinal parallel volcano-intrusive belts, rarely extending outside them. Diagonal intra-belt trends of mineralization are common, particularly at the intersections of longitudinal and transverse (oblique) fault/fracture zones based on the authors' review of available geological data. The locations of these gold-copper deposits are obviously influenced by transvers

关键词： intrusive-related gold-copper deposit porphyry gold-copper deposit new south wales Australia diagonal intra-belt trend

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Development and application of a system for the analysis of atmospheric, water and sediment nitrogen and carbon

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Journal of Environmental Science and Engineering 2009年第9期3卷 35-49页

作者： Ann Stavert Stephen R. Wilson Dianne F. Jolley School of Chemistry University of Wollongong NSW 2522 Australia CSIRO Marine and Atmospheric Research PB 1 Aspendale Vic 3195 Australia

Eutrophication and climate change, key environmental concerns, are both linked to the carbon and nitrogen cycles hence the improved understanding of these cycles is essential. Currently, there is no system that simultaneously measures the fluxes of the three key gas phase products of nitrogen and carbon cycling （CO2, CH4 and N2O） in submerged ecosystems with hourly time resolution. A ＂Lake-in-a-box＂（mesocosm） was developed in the laboratory which allowed the monitoring of key components of the carbon and nitrogen cycles within the air, water and sediments. The approach is automated, simple and time efficient and novel in its ability to examine many different carbon and nitrogen compounds in all three physical component of the ＂lake＂. Dramatic fluctuations in gaseous flux and the concentrations of overlying water and sedimentary carbon and nitrogen compounds were noted over a three week period. These were split into five distinct phases which were linked to changes in sedimentary N and C cycling. The results highlighted the important of links between the two cycles and supported recent studies showing that estuarine sediments can act as both a source and a sink of nitrogen.

关键词： nitrogen cycle carbon cycle monitoring systems estuarine chemistry gas production Australia new south wales Lake Macquarie

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The Impact of the COVID-19 Pandemic on a Sydney Metropolitan Hospital Emergency Department

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Open Journal of Emergency Medicine 2022年第4期10卷 183-193页

作者： Joshua Scott-King Lisa Hodder Catherine Thomas Jason Diab Lai Heng Foong Christophe R. Berney Matthew Smith Bankstown Lidcombe Hospital Bankstown NSW Australia School of Medicine University of New South Wales Sydney Australia School of Medicine University of Sydney Sydney Australia Australian National University Canberra Australia School of Medicine University of Notre Dame Sydney Australia

Introduction: The impact of the COVID-19 has resulted in a decrease in presentations in emergency departments (ED). This has been influenced by societal restrictions, lockdowns and access to services. This study aims to observe the patterns in ED presentations for Bankstown-Lidcombe Hospital over the course of the initial COVID-19 pandemic wave. Methods: A retrospective review of all presentations to Bankstown-Lidcombe Hospital ED was conducted comparing monthly patient encounters from February-August for 2017-2020. Results: The total number of ED presentations was 42,225. There was a statistically significant reduction during 2020 of 9.8% between the study periods (1546 vs 1395, p = 0.014). The period of greatest reduction was seen in March-May, the strictest lockdown period for new south wales. The admitting disciplines that showed a reduction in this time were colorectal (76.62%, p = 0.046), emergency (25.53%, p = 0.025), endocrine (31.82%, p = 0.026), orthopaedics (33.63%, p = 0.004), and vascular (35.71%, p = 0.017). The disciplines that showed an increase in presentations over the entire studied time were gynaecology (26.54%, p = 0.008), and psychiatry (17.46%, p = 0.011). Conclusion: There were significant reductions in total number of ED presentations. Notably, there were significant reductions across multiple admitting disciplines, as well as in a decrease in presentations for those in younger age groups.

关键词： COVID-19 Pandemics Length of Stay Emergency new south wales

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