Kelvin Hussey - Academia.edu (original) (raw)
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Faculty of Technical & Engineering, Islamic Azad University South Tehran Branch, Tehran, Iran
CSIC (Consejo Superior de Investigaciones Científicas-Spanish National Research Council)
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Papers by Kelvin Hussey
ASEG extended abstracts, Dec 1, 2015
Contributions to Mineralogy and Petrology, Jul 21, 2015
© Northern Territory Government March 2017. Copying and redistribution of this publication is per... more © Northern Territory Government March 2017. Copying and redistribution of this publication is permitted but the copyright notice must be kept intact and the source attributed appropriately. Nolans is a rare earth element-phosphorus-uranium (REE-P-U) fluorapatite vein deposit located in the central part of the Aileron Province. The deposit is hosted mostly by the ca 1805 Ma Boothby Orthogneiss, which has been strongly affected by the 1590–1560 Ma, high T-low P Chewings Orogeny (Figure 1; Scrimgeour 2013). Three zones are distinguished: Northern, Central and Southeast zones (Figure 2a). The Northern and Southeast zones consist of east-east northeast-trending, steeply northdipping veins and breccia zones (Figure 2b); the Central Zone consists of a north-trending, sub-vertical vein/breccia zone. The current mineral resource at Nolans totals 56 Mt grading 2.6% total rare-earth oxides, 12% P2O5 and 162 ppm U (0.42 lb/tonne U3O8) (Arafura Resources Limited 2015). This contribution and Hust...
Precambrian Research, 2008
Protoliths of the Strangways Metamorphic Complex (SMC) in the Arunta Region of central Australia ... more Protoliths of the Strangways Metamorphic Complex (SMC) in the Arunta Region of central Australia are dated to the 1810–1800Ma Stafford magmatic event by SHRIMP U–Pb dating of relict igneous zircon within granulite-facies metamorphic rocks. Detrital zircons preserved in associated metasediment have a provenance age spectrum similar to that in the Lander Package sedimentary rocks which are widespread in the region.
Precambrian Research, 2008
The magnitude of systematic uncertainties inherent in comparisons of Proterozoic 40Ar/39Ar- and U... more The magnitude of systematic uncertainties inherent in comparisons of Proterozoic 40Ar/39Ar- and U–Pb-based ages is illustrated via a consideration of age constraints on two contrasting styles of Palaeoproterozoic mineralization in northern Australia. Published 40Ar/39Ar ages for Au–Cu–Bi-mineralization in the Tennant Creek region range from 1825 to 1829Ma, apparently younger than the timing of deformation bracketed by 207Pb/206Pb zircon ages of igneous rocks at ∼1850Ma. Despite this apparent age offset, propagation of systematic uncertainties in the 40Ar/39Ar ages shows that they are indistinguishable from the ∼1850Ma zircon ages. Recalculation using revised estimates of the 40K decay constant and age of the 40Ar/39Ar standard shifts the 40Ar/39Ar ages to 1847–1851Ma, in excellent agreement with 207Pb/206Pb zircon ages from Tennant Supersuite igneous rocks and with local geological constraints. To the south of Tennant Creek, in the Davenport Ranges, numerous small W prospects have been interpreted to be coeval with post-tectonic granites of the Devils Suite at ∼1710–1720Ma. New 40Ar/39Ar ages from muscovite selvages on wolframite-bearing veins range from 1697 to 1703Ma. These ages shift to 1711 to 1717Ma when recalculated using revised estimates for 40K decay constant and age of standard material, bringing them into agreement with existing 207Pb/206Pb zircon ages for Devils Suite granitoids, and consistent with field and geochemical interpretations. These examples highlight the importance of considering systematic sources of uncertainty when comparing radiometric ages determined via different isotopic methods, particularly in the Proterozoic and Archean parts of the timescale. Ongoing work to calibrate the 40Ar/39Ar and U–Pb-based timescales will further enhance the application of multiple isotopic methods to constrain geological processes.
Mineralium Deposita, 2016
ASEG extended abstracts, Dec 1, 2015
Contributions to Mineralogy and Petrology, Jul 21, 2015
© Northern Territory Government March 2017. Copying and redistribution of this publication is per... more © Northern Territory Government March 2017. Copying and redistribution of this publication is permitted but the copyright notice must be kept intact and the source attributed appropriately. Nolans is a rare earth element-phosphorus-uranium (REE-P-U) fluorapatite vein deposit located in the central part of the Aileron Province. The deposit is hosted mostly by the ca 1805 Ma Boothby Orthogneiss, which has been strongly affected by the 1590–1560 Ma, high T-low P Chewings Orogeny (Figure 1; Scrimgeour 2013). Three zones are distinguished: Northern, Central and Southeast zones (Figure 2a). The Northern and Southeast zones consist of east-east northeast-trending, steeply northdipping veins and breccia zones (Figure 2b); the Central Zone consists of a north-trending, sub-vertical vein/breccia zone. The current mineral resource at Nolans totals 56 Mt grading 2.6% total rare-earth oxides, 12% P2O5 and 162 ppm U (0.42 lb/tonne U3O8) (Arafura Resources Limited 2015). This contribution and Hust...
Precambrian Research, 2008
Protoliths of the Strangways Metamorphic Complex (SMC) in the Arunta Region of central Australia ... more Protoliths of the Strangways Metamorphic Complex (SMC) in the Arunta Region of central Australia are dated to the 1810–1800Ma Stafford magmatic event by SHRIMP U–Pb dating of relict igneous zircon within granulite-facies metamorphic rocks. Detrital zircons preserved in associated metasediment have a provenance age spectrum similar to that in the Lander Package sedimentary rocks which are widespread in the region.
Precambrian Research, 2008
The magnitude of systematic uncertainties inherent in comparisons of Proterozoic 40Ar/39Ar- and U... more The magnitude of systematic uncertainties inherent in comparisons of Proterozoic 40Ar/39Ar- and U–Pb-based ages is illustrated via a consideration of age constraints on two contrasting styles of Palaeoproterozoic mineralization in northern Australia. Published 40Ar/39Ar ages for Au–Cu–Bi-mineralization in the Tennant Creek region range from 1825 to 1829Ma, apparently younger than the timing of deformation bracketed by 207Pb/206Pb zircon ages of igneous rocks at ∼1850Ma. Despite this apparent age offset, propagation of systematic uncertainties in the 40Ar/39Ar ages shows that they are indistinguishable from the ∼1850Ma zircon ages. Recalculation using revised estimates of the 40K decay constant and age of the 40Ar/39Ar standard shifts the 40Ar/39Ar ages to 1847–1851Ma, in excellent agreement with 207Pb/206Pb zircon ages from Tennant Supersuite igneous rocks and with local geological constraints. To the south of Tennant Creek, in the Davenport Ranges, numerous small W prospects have been interpreted to be coeval with post-tectonic granites of the Devils Suite at ∼1710–1720Ma. New 40Ar/39Ar ages from muscovite selvages on wolframite-bearing veins range from 1697 to 1703Ma. These ages shift to 1711 to 1717Ma when recalculated using revised estimates for 40K decay constant and age of standard material, bringing them into agreement with existing 207Pb/206Pb zircon ages for Devils Suite granitoids, and consistent with field and geochemical interpretations. These examples highlight the importance of considering systematic sources of uncertainty when comparing radiometric ages determined via different isotopic methods, particularly in the Proterozoic and Archean parts of the timescale. Ongoing work to calibrate the 40Ar/39Ar and U–Pb-based timescales will further enhance the application of multiple isotopic methods to constrain geological processes.
Mineralium Deposita, 2016