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Journal articles on the topic 'Mt Isa Region (Qld )'

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Author: Grafiati

Published: 10 December 2022

Last updated: 29 January 2023

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1

Ginwal, H. S., Pradip Kumar, V. K. Sharma, A. K. Mandal, and C. E. Harwood. "Genetic Variability and Early Growth Performance of Eucalyptus tereticornis Sm. in Provenance cum Progeny Trials in India." Silvae Genetica 53, no. 1-6 (December 1, 2004): 148–53. http://dx.doi.org/10.1515/sg-2004-0027.

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Abstract Results of provenance cum progeny trials of Eucalyptus tereticornis Sm. laid out in 2002 at three sites viz. FRI Campus (Uttaranchal), Chiryanpur (Uttaranchal) and Midnapore (West Bengal) located in tropical region of India are reported and discussed. Thirteen provenances representing 91 families from Australia and Papua New Guinea (PNG) viz. Oro bay to Emo, PNG; Sirinumu Sogeri Plat, PNG; Warwick, QLD; Yurammie, SF, NSW; Buckenbowra SF, NSW; Selection flat SF559, NSW; Credition SF, QLD; Cardwell, QLD; Mitchell River MT Molloy, QLD; Mill stream archer creek, QLD; Helenvale, QLD; Walsh River, QLD; Burdekin River, QLD were evaluated from nursery stage to field performance (age 21months). As a local seed source open-pollinated seeds collected from selected interspecific Eucalyptus F1 hybrid trees of FRI-4, FRI-5 and Mysore gum (Eucalyptus teretirornis) were used to serve as check material (control). Significant differences between the provenances and families at age 21 months were observed for height, clean stem length, collar diameter and field survival. Significant provenance x site interaction was observed for height. In general the north Queensland provenances performed better and in particular two provenances viz. Walsh River, QLD and Burdekin River, QLD ranked the best in comparison to others at this age. Results indicate that significant genetic differences exist between the families and provenances of E. tereticornis. The growth traits were inter-correlated with each other. Geographic clinal variation pattern was observed in some of the growth traits viz. height, clean stem height and collar diameter. There were fair differences between phenotypic and genotypic coefficient of variability. Heritability (narrow sense) values were fairly good for height and clear stem length in comparison to collar diameter. The relative performance of the provenances was fairly consistent throughout test sites.

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2

Murphy, F. C. "Preface: Multiscale analysis of the Mt Isa–McArthur region, Northern Australia." Australian Journal of Earth Sciences 58, no. 8 (December 2011): 847–48. http://dx.doi.org/10.1080/08120099.2011.633985.

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3

Saygin, E., H. McQUEEN, L. J. Hutton, B. L. N. Kennett, and G. Lister. "Structure of the Mt Isa region from seismic ambient noise tomography." Australian Journal of Earth Sciences 60, no. 6-7 (October 2013): 707–18. http://dx.doi.org/10.1080/08120099.2013.837098.

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4

Murphy, F. C., L. J. Hutton, J. L. Walshe, J. S. Cleverley, M. A. Kendrick, J. Mclellan, M. J. Rubenach, et al. "Mineral system analysis of the Mt Isa–McArthur River region, Northern Australia." Australian Journal of Earth Sciences 58, no. 8 (December 2011): 849–73. http://dx.doi.org/10.1080/08120099.2011.606333.

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5

Betts, P. G., G. S. Lister, and K. S. Pound. "Architecture of a Palaeoproterozoic Rift System: Evidence from the Fiery Creek Dome region, Mt Isa terrane." Australian Journal of Earth Sciences 46, no. 4 (August 1999): 533–54. http://dx.doi.org/10.1046/j.1440-0952.1999.00721.x.

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6

Le, Truong X., Paul H. G. M. Dirks, Ioan V. Sanislav, Jan M. Huizenga, Helen A. Cocker, and Grace N. Manestar. "Geochronological constraints on the geological history and gold mineralization in the Tick Hill region, Mt Isa Inlier." Precambrian Research 366 (November 2021): 106422. http://dx.doi.org/10.1016/j.precamres.2021.106422.

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7

Drummond, Barry J., Bruce R. Goleby, A. J. Owen, A. N. Yeates, C. Swager, Y. Zhang, and J. K. Jackson. "Seismic reflection imaging of mineral systems: Three case histories." GEOPHYSICS 65, no. 6 (November 2000): 1852–61. http://dx.doi.org/10.1190/1.1444869.

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Mineral deposits can be described in terms of their mineral systems, i.e., fluid source, migration pathway, and trap. Source regions are difficult to recognize in seismic images. Many orebodies lie on or adjacent to major fault systems, suggesting that the faults acted as fluid migration pathways through the crust. Large faults often have broad internal zones of deformation fabric, which is anisotropic. This, coupled with the metasomatic effects of fluids moving along faults while they are active, can make the faults seismically reflective. For example, major gold deposits in the Archaean Eastern Goldfields province of Western Australia lie in the hanging‐wall block of regional‐scale faults that differ from other nearby faults by being highly reflective and penetrating to greater depths in the lower crust. Coupled thermal, mechanical, and fluid‐flow modeling supports the theory that these faults were fluid migration pathways from the lower to the upper crust. Strong reflections are also recorded from two deeply penetrating faults in the Proterozoic Mt. Isa province in northeastern Australia. Both are closely related spatially to copper and copper‐gold deposits. One, the Adelheid fault, is also adjacent to the large Mt. Isa silver‐lead‐zinc deposit. In contrast, other deeply penetrating faults that are not intrinsically reflective but are mapped in the seismic section on the basis of truncating reflections have no known mineralization. Regional seismic profiles can therefore be applied in the precompetitive area selection stage of exploration. Applying seismic techniques at the orebody scale can be difficult. Orebodies often have complex shapes and reflecting surfaces that are small compared to the diameter of the Fresnel zone for practical seismic frequencies. However, if the structures and alteration haloes around the orebodies themselves, seismic techniques may be more successful. Strong bedding‐parallel reflections were observed from the region of alteration around the Mt. Isa silver‐lead‐zinc orebodies using high‐resolution profiling. In addition, a profile in Tasmania imaged an internally nonreflective bulge within the Que Hellyer volcanics, suggesting a good location to explore for a volcanic hosted massive sulfide deposit. These case studies provide a pointer to how seismic techniques could be applied during mineral exploration, especially at depths greater than those being explored with other techniques.

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8

Hodgkinson, Jane H., Stephen J. Fraser, and Paul Donchak. "Using self-organising maps to derive lithological boundaries from geophysically-derived data in the Mt. Isa region, Queensland." ASEG Extended Abstracts 2012, no. 1 (December 2012): 1–4. http://dx.doi.org/10.1071/aseg2012ab359.

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9

MAHONY, MICHAEL J., HARRY B. HINES, TERRY BERTOZZI, STEPHEN V. MAHONY, DAVID A. NEWELL, JOHN M. CLARKE, and STEPHEN C. DONNELLAN. "A new species of Philoria (Anura: Limnodynastidae) from the uplands of the Gondwana Rainforests World Heritage Area of eastern Australia." Zootaxa 5104, no. 2 (February 25, 2022): 209–41. http://dx.doi.org/10.11646/zootaxa.5104.2.3.

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The six species of mountain frogs (Philoria: Limnodynastidae: Anura) are endemic to south-eastern Australia. Five species occur in headwater systems in mountainous north-eastern New South Wales (NSW) and south-eastern Queensland (Qld), centred on the Gondwana Rainforests of Australia World Heritage Area. A previous molecular genetic analysis identified divergent genetic lineages in the central and western McPherson Ranges region of Qld and NSW, but sampling was inadequate to test the species status of these lineages. With more comprehensive geographic sampling and examination of the nuclear genome using SNP analysis, we show that an undescribed species, P. knowlesi sp. nov., occurs in the central and western McPherson Ranges (Levers Plateau and Mount Barney complex). The new species is not phylogenetically closely related to P. loveridgei in the nuclear data but is related to one of two divergent lineages within P. loveridgei in the mtDNA data. We postulate that the discordance between the nuclear and mtDNA outcomes is due to ancient introgression of the mtDNA genome from P. loveridgei into the new species. Male advertisement calls and multivariate morphological analyses do not reliably distinguish P. knowlesi sp. nov. from any of the Philoria species in northeast NSW and southeast Qld. The genetic comparisons also enable us to define further the distributions of P. loveridgei and P. kundagungan. Samples from the Lamington Plateau, Springbrook Plateau, Wollumbin (Mt Warning National Park), and the Nightcap Range, are all P. loveridgei, and its distribution is now defined as the eastern McPherson Ranges and Tweed caldera. Philoria kundagungan is distributed from the Mistake Mountains in south-eastern Qld to the Tooloom Scrub on the Koreelah Range, southwest of Woodenbong, in NSW, with two subpopulations identified by SNP analysis. We therefore assessed the IUCN threat category of P. loveridgei and P. kundagungan and undertook new assessments for each of its two subpopulations and for the new taxon P. knowlesi sp. nov., using IUCN Red List criteria. Philoria loveridgei, P. kundagungan (entire range and northern subpopulation separately) and P. knowlesi sp. nov. each meet criteria for “Endangered” (EN B2(a)(b)[i, iii]). The southern subpopulation of P. kundagungan, in the Koreelah Range, meets criteria for “Critically Endangered” (CE B2(a)(b)[i, iii]). These taxa are all highly threatened due to the small number of known locations, the restricted nature of their breeding habitat, and direct and indirect threats from climate change, and the potential impact of the amphibian disease chytridiomycosis. Feral pigs are an emerging threat, with significant impacts now observed in Philoria breeding habitat in the Mistake Mountains.

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10

Wang, Baohang, Qin Zhang, Antonio Pepe, Pietro Mastro, Chaoying Zhao, Zhong Lu, Wu Zhu, Chengsheng Yang, and Jing Zhang. "Analysis of Groundwater Depletion/Inflation and Freeze–Thaw Cycles in the Northern Urumqi Region with the SBAS Technique and an Adjusted Network of Interferograms." Remote Sensing 13, no. 11 (May 29, 2021): 2144. http://dx.doi.org/10.3390/rs13112144.

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This work investigated the large-scale ground deformations threatening the Northern Urumqi district, China, which are connected to groundwater exploitation and the seasonal freeze–thaw cycles that characterize this frozen region. Ground deformations can be well captured by satellite data using a multi-temporal interferometric synthetic aperture radar (Mt-InSAR) approach. The accuracy of the achievable ground deformation products (e.g., mean displacement time series and related ground displacement time series) critically depends on the number and quality of the selected interferograms. This paper presents a straightforward interferogram selection algorithm that can be applied to identify an optimal network of small baseline (SB) interferograms. The selected SB interferograms are then used to produce ground deformation products using the well-known small baseline subset (SBAS) Mt-InSAR algorithm. The developed interferogram selection algorithm (ISA) permits the selection of the group of SB data pairs that minimize the relative error of the mean ground deformation velocity. Experiments were carried out using a group of 102 Sentinel-1B SAR data collected from 12 April 2017 to 29 October 2020. This research study shows that the investigated farmland region is characterized by a maximum ground deformation rate of about 120 mm/year. Periodic groundwater overexploitation, coupled with irrigation and freeze–thaw phases, is also responsible for seasonal (one-year) ground displacement signals, with oscillation amplitudes up to 120 mm in the zones of maximum displacement.

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11

Codd, A. L., and L. Gross. "Three-dimensional inversion for sparse potential data using first-order system least squares with application to gravity anomalies in Western Queensland." Geophysical Journal International 227, no. 3 (August 13, 2021): 2095–120. http://dx.doi.org/10.1093/gji/ggab323.

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SUMMARY We present an inversion algorithm tailored for point gravity data. As the data are from multiple surveys, it is inconsistent with regards to spacing and accuracy. An algorithm design objective is the exact placement of gravity observations to ensure no interpolation of the data is needed prior to any inversion. This is accommodated by discretization using an unstructured tetrahedral finite-element mesh for both gravity and density with mesh nodes located at all observation points and a first-order system least-squares (FOSLS) formulation for the gravity modelling equations. Regularization follows the Bayesian framework where we use a differential operator approximation of an exponential covariance kernel, avoiding the usual requirement of inverting large dense covariance matrices. Rather than using higher order basis functions with continuous derivatives across element faces, regularization is also implemented with a FOSLS formulation using vector-valued property function (density and its gradient). Minimization of the cost function, comprised of data misfit and regularization, is achieved via a Lagrange multiplier method with the minimum of the gravity FOSLS functional as a constraint. The Lagrange variations are combined into a single equation for the property function and solved using an integral form of the pre-conditioned conjugate gradient method (I-PCG). The diagonal entries of the regularization operator are used as the pre-conditioner to minimize computational costs and memory requirements. Discretization of the differential operators with the finite-element method (FEM) results in matrix systems that are solved with smoothed aggregation algebraic multigrid pre-conditioned conjugate gradient (AMG-PCG). After their initial setup, the AMG-PCG operators and coarse grid solvers are reused in each iteration step, further reducing computation time. The algorithm is tested on data from 23 surveys with a total of 6519 observation points in the Mt Isa–Cloncurry region in north–west Queensland, Australia. The mesh had about 2.5 million vertices and 16.5 million cells. A synthetic case was also tested using the same mesh and error measures for localized concentrations of high and low densities. The inversion results for different parameters are compared to each other as well as to lower order smoothing. Final inversion results are shown with and without depth weighting and compared to previous geological studies for the Mt Isa–Cloncurry region.

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12

Anand, Ravi R. "Regolith-landform processes and geochemical exploration for base metal deposits in regolith-dominated terrains of the Mt Isa region, northwest Queensland, Australia." Ore Geology Reviews 73 (March 2016): 451–74. http://dx.doi.org/10.1016/j.oregeorev.2015.08.014.

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13

Black, L. P., P. Gregory, I. W. Withnall, and J. H. C. Bain. "U‐Pb zircon age for the Etheridge Group, Georgetown region, north Queensland: Implications for relationship with the Broken Hill and Mt Isa sequences*." Australian Journal of Earth Sciences 45, no. 6 (December 1998): 925–35. http://dx.doi.org/10.1080/08120099808728446.

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14

Barbuena, Danilo, Carlos Roberto de Souza Filho, Emilson Pereira Leite, Emílio Miguel Junior, Rafael Rodrigues de Assis, Roberto Perez Xavier, Francisco José Fonseca Ferreira, and Antônio João Paes de Barros. "AIRBORNE GEOPHYSICAL DATA ANALYSIS APPLIED TO GEOLOGICAL INTERPRETATION IN THE ALTA FLORESTA GOLD PROVINCE, MT." Revista Brasileira de Geofísica 31, no. 1 (March 1, 2013): 169. http://dx.doi.org/10.22564/rbgf.v31i1.254.

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The Alta Floresta Gold Province (AFGP) is located in the central-southern portion of the Amazon Craton. In its eastern segment there are more than one hundred gold deposits hosted in volcanic and plutonic rocks of medium to high content of potassium. In many of these deposits the gold ore is correlated spatially and genetically hydrothermal systems and mainly hosted into the silicification potassic and sericitic. In this context, this work focuses on understanding the geological context of the region and the possibility of expanding new exploratory frontiers through techniques further traditional geological mapping. The processing and interpretation of airborne magnetic and gamma-ray spectrometry data of the Juruena-Teles Pires Project (Phase 1) allowed the production of a new regional geological map of the eastern portion of the AFGP. Additionally, theoretical models showed that despite the limitations of the reduction to the pole at low latitudes, the magnetic enhancements proposed can be applied to real data through the use of directional filtering to eliminate the features generated in the magnetic declination direction. The Total Horizontal Derivative of the Tilt Derivative (THDR-TDR) method proved the best enhancement for the interpretation of the structures, showing a structural complexity similar to that proposed for the evolution of the province. The interpretation of the products based on the gamma-ray spectrometry channels allowed the reinterpretation of different geological units, including the individualization of a new high-potassium intrusive unit, which in the context of AFGP may have metallogenetic potential. RESUMO: A Província Aurífera de Alta Floresta (PAAF) situa-se na porção centro-sul do cráton Amazônico. Em seu segmento leste, ocorrem mais de uma centena de depósitos auríferos hospedados em rochas plutônicas e vulcânicas de médio a alto potássio. Além disso, em muitos desses depósitos o minério aurífero apresenta relação espacial e genética com alterações hidrotermais, preferencialmente alterações do tipo potássica e sericítica. Nesse contexto, o trabalho enfoca o entendimento do contexto geológico dessa região e a possibilidade de expansão de novas fronteiras exploratórias por meio de técnicas que vão além do mapeamento geológico tradicional. Assim, através do processamento e interpretação de dados aeromagnetométricos e aerogamaespectrométricos do projeto Juruena-Teles Pires (Fase 1) gerou-se um novo mapa geológico regional da porção leste da PAAF. Adicionalmente, por meio de modelos teóricos observou-se que apesar das limitações da redução ao polo em baixas latitudes, os realces magnéticos propostos podem ser aplicados aos dados reais mediante o uso de filtros direcionais que eliminem os artefatos gerados na direção da declinação magnética. O método Inclinação do Sinal Analítico do Gradiente Horizontal Total (ISA-GHT) mostrou-se como o realce mais adequado para a interpretação de lineamentos, revelando uma complexidade estrutural similar àquela proposta para a evolução da província. A interpretação dos produtos gerados com base nos canais gamaespectrométricos permitiu a reinterpretação de diversas unidades geológicas, inclusive a individualização de uma nova unidade intrusiva de alto potássio, que nocontexto da PAAF pode possuir potencial metalogenético.Palavras-chave: Província Aurífera de Alta Floresta; dados aerogeofísicos; interpretação geológica

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15

Audet, P., S. Arnold, A. M. Lechner, D. R. Mulligan, and T. Baumgartl. "Climate suitability estimates offer insight into fundamental revegetation challenges among post-mining rehabilitated landscapes in eastern Australia." Biogeosciences Discussions 9, no. 12 (December 18, 2012): 18545–69. http://dx.doi.org/10.5194/bgd-9-18545-2012.

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Abstract. Rehabilitation of post-mining sites in semi-arid/subtropical environments of eastern Australia have a general objective to establish specific types of native vegetation communities as defined in mine closure plans and in relation to the specific biotic and abiotic requirements of such communities. Critical for the success of rehabilitation is the availability of water and hence the climatic characteristic of this geographical region which is defined by a number of weather-bound factors (e.g. potentially erratic rainfall and periods of drought and flooding). However, specific estimates of climate suitability are seldom incorporated into current mined land rehabilitation design. To address this, our analysis combined various broad-scale climatic parameters (i.e. primarily relating to rainfall) to assess bioregional suitability-susceptibility within the context of plant early-establishment in the objective of informing rehabilitation schemes as to the inherent environmental challenges influencing both short- and long-term ecological development. Following our survey of available climate data, we derived site suitability-susceptibility indexes (that are otherwise currently not available within rehabilitation schemes) and compared the performance of 9 mine site locations in which our Centre has been engaged in environmental monitoring (Weipa, Mt. Isa, Ernest Henry, Eromanga, Kidston, Curragh, Tarong, North Stradbroke Island, and Newnes Plateau). More specifically, the sites were ranked from most-to-least suitable and compared with natural vegetation patterns (as estimated by the mean NDVI). Overall, it was determined that regular rainfall and relatively short periods of water-deficit are key characteristics of climate suitability (as found among the relatively more temperate coastal-hinterland sites), whereas high rainfall variability and (or) prolonged seasonal drought are primary characteristics of unsuitability (as found among the arid central-inland sites). Conceptual and practical considerations are provided which could inform rehabilitation schemes as to the inherent environmental challenges influencing both short- and long-term ecological development.

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16

Audet, P., S. Arnold, A. M. Lechner, and T. Baumgartl. "Site-specific climate analysis elucidates revegetation challenges for post-mining landscapes in eastern Australia." Biogeosciences 10, no. 10 (October 15, 2013): 6545–57. http://dx.doi.org/10.5194/bg-10-6545-2013.

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Abstract. In eastern Australia, the availability of water is critical for the successful rehabilitation of post-mining landscapes and climatic characteristics of this diverse geographical region are closely defined by factors such as erratic rainfall and periods of drought and flooding. Despite this, specific metrics of climate patterning are seldom incorporated into the initial design of current post-mining land rehabilitation strategies. Our study proposes that a few common rainfall parameters can be combined and rated using arbitrary rainfall thresholds to characterise bioregional climate sensitivity relevant to the rehabilitation these landscapes. This approach included assessments of annual rainfall depth, average recurrence interval of prolonged low intensity rainfall, average recurrence intervals of short or prolonged high intensity events, median period without rain (or water-deficit) and standard deviation for this period in order to address climatic factors such as total water availability, seasonality and intensity – which were selected as potential proxies of both short- and long-term biological sensitivity to climate within the context of post-disturbance ecological development and recovery. Following our survey of available climate data, we derived site "climate sensitivity" indexes and compared the performance of 9 ongoing mine sites: Weipa, Mt. Isa and Cloncurry, Eromanga, Kidston, the Bowen Basin (Curragh), Tarong, North Stradbroke Island, and the Newnes Plateau. The sites were then ranked from most-to-least sensitive and compared with natural bioregional patterns of vegetation density using mean NDVI. It was determined that regular rainfall and relatively short periods of water-deficit were key characteristics of sites having less sensitivity to climate – as found among the relatively more temperate inland mining locations. Whereas, high rainfall variability, frequently occurring high intensity events, and (or) prolonged seasonal drought were primary indicators of sites having greater sensitivity to climate – as found among the semi-arid central-inland sites. Overall, the manner in which these climatic factors are identified and ultimately addressed by land managers and rehabilitation practitioners could be a key determinant of achievable success at given locations at the planning stages of rehabilitation design.

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