Excess <sup>40</sup>Ar in Alkali Feldspar and <sup>206,207</sup>Pb in Apatite Caused by Fluid-Induced Recrystallisation in a Semi-Closed Environment in Proterozoic (Meta)Granites of the Mt Isa Inlier, NE Australia
Interpretation of <sup>40</sup>Ar/<sup>39</sup>Ar dates of alkali feldspar and U-Pb dates of apatite depends on the dominant mechanism of isotopic transport in these minerals, which can be either diffusion or fluid-assisted dissolution-reprecipitation. To clarify the contribu...
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| author | Daniil Popov Richard Spikings André Navin Paul Maria Ovtcharova Massimo Chiaradia Martin Kutzschbach Alexey Ulianov Gary O’Sullivan David Chew Kalin Kouzmanov Eszter Badenszki J. Stephen Daly Joshua H. F. L. Davies |
| author_facet | Daniil Popov Richard Spikings André Navin Paul Maria Ovtcharova Massimo Chiaradia Martin Kutzschbach Alexey Ulianov Gary O’Sullivan David Chew Kalin Kouzmanov Eszter Badenszki J. Stephen Daly Joshua H. F. L. Davies |
| author_sort | Daniil Popov |
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| description | Interpretation of <sup>40</sup>Ar/<sup>39</sup>Ar dates of alkali feldspar and U-Pb dates of apatite depends on the dominant mechanism of isotopic transport in these minerals, which can be either diffusion or fluid-assisted dissolution-reprecipitation. To clarify the contributions of these processes, we have conducted a holistic study of alkali feldspar, apatite and other minerals from the Mt. Isa Inlier in NE Australia. Mineral characterisation by electron microscopy, optical cathodoluminescence imaging and element mapping reveal a complex interplay of textures resulting from magmatic crystallisation, deuteric recrystallisation, local deformation with subsequent higher-temperature alteration, and finally ubiquitous low-temperature alteration. U-Pb and Pb isotopic data for zircon, apatite, fluorite and alkali feldspar suggest that the latter event occurred at ~300 Ma and was associated with fluid-assisted exchange of Pb isotopes between minerals in the same rock, causing some apatite grains to have <sup>207</sup>Pb-corrected U-Pb dates that exceed their crystallisation age. However, this event had no unequivocal effect on the <sup>40</sup>Ar/<sup>39</sup>Ar or Rb-Sr systematics of the alkali feldspar, which were disturbed by higher-temperature alteration at ~1450 Ma. The age of the latter event is derived from Rb-Sr data. <sup>40</sup>Ar/<sup>39</sup>Ar dates are very scattered and suggest that <sup>40</sup>Ar redistribution proceeded by diffusion in the presence of traps in some places and by dissolution-reprecipitation with variable amounts of recycling in other places. Our results demonstrate the complex effects that interaction with limited amounts of fluids can have on <sup>40</sup>Ar/<sup>39</sup>Ar dates of alkali feldspar and U-Pb dates of apatite and thereby reinforce previous critique of their suitability for thermochronological reconstructions. We further identify and discuss potential implications for noble gas geochronology of groundwaters and fission track dating of apatite. |
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| spelling | doaj-art-d5f79acafa5d48ccbef409ee7b5c32452025-08-20T02:00:27ZengMDPI AGGeosciences2076-32632024-12-01141235810.3390/geosciences14120358Excess <sup>40</sup>Ar in Alkali Feldspar and <sup>206,207</sup>Pb in Apatite Caused by Fluid-Induced Recrystallisation in a Semi-Closed Environment in Proterozoic (Meta)Granites of the Mt Isa Inlier, NE AustraliaDaniil Popov0Richard Spikings1André Navin Paul2Maria Ovtcharova3Massimo Chiaradia4Martin Kutzschbach5Alexey Ulianov6Gary O’Sullivan7David Chew8Kalin Kouzmanov9Eszter Badenszki10J. Stephen Daly11Joshua H. F. L. Davies12CNRS, Université d’Orléans, CEMHTI UPR, 3079 Orléans, FranceDepartment of Earth Sciences, University of Geneva, 13 Rue des Maraichers, CH-1205 Geneva, SwitzerlandDepartment of Earth Sciences, University of Geneva, 13 Rue des Maraichers, CH-1205 Geneva, SwitzerlandDepartment of Earth Sciences, University of Geneva, 13 Rue des Maraichers, CH-1205 Geneva, SwitzerlandDepartment of Earth Sciences, University of Geneva, 13 Rue des Maraichers, CH-1205 Geneva, SwitzerlandGeology & Palaeoenvironmental Research, Goethe University Frankfurt, 60438 Frankfurt am Main, GermanyInstitute of Earth Sciences, University of Lausanne, UNIL-Mouline, CH-1015 Lausanne, SwitzerlandUCD School of Earth Sciences, University College Dublin, Dublin 4 Belfield, IrelandDepartment of Geology, School of Natural Sciences, Trinity College Dublin, Dublin 2 Dublin, IrelandDepartment of Earth Sciences, University of Geneva, 13 Rue des Maraichers, CH-1205 Geneva, SwitzerlandUCD School of Earth Sciences, University College Dublin, Dublin 4 Belfield, IrelandUCD School of Earth Sciences, University College Dublin, Dublin 4 Belfield, IrelandSciences de la Terre et de l’atmosphère/Geotop, Université du Québec à Montréal, Montréal, QC H2X 3Y7, CanadaInterpretation of <sup>40</sup>Ar/<sup>39</sup>Ar dates of alkali feldspar and U-Pb dates of apatite depends on the dominant mechanism of isotopic transport in these minerals, which can be either diffusion or fluid-assisted dissolution-reprecipitation. To clarify the contributions of these processes, we have conducted a holistic study of alkali feldspar, apatite and other minerals from the Mt. Isa Inlier in NE Australia. Mineral characterisation by electron microscopy, optical cathodoluminescence imaging and element mapping reveal a complex interplay of textures resulting from magmatic crystallisation, deuteric recrystallisation, local deformation with subsequent higher-temperature alteration, and finally ubiquitous low-temperature alteration. U-Pb and Pb isotopic data for zircon, apatite, fluorite and alkali feldspar suggest that the latter event occurred at ~300 Ma and was associated with fluid-assisted exchange of Pb isotopes between minerals in the same rock, causing some apatite grains to have <sup>207</sup>Pb-corrected U-Pb dates that exceed their crystallisation age. However, this event had no unequivocal effect on the <sup>40</sup>Ar/<sup>39</sup>Ar or Rb-Sr systematics of the alkali feldspar, which were disturbed by higher-temperature alteration at ~1450 Ma. The age of the latter event is derived from Rb-Sr data. <sup>40</sup>Ar/<sup>39</sup>Ar dates are very scattered and suggest that <sup>40</sup>Ar redistribution proceeded by diffusion in the presence of traps in some places and by dissolution-reprecipitation with variable amounts of recycling in other places. Our results demonstrate the complex effects that interaction with limited amounts of fluids can have on <sup>40</sup>Ar/<sup>39</sup>Ar dates of alkali feldspar and U-Pb dates of apatite and thereby reinforce previous critique of their suitability for thermochronological reconstructions. We further identify and discuss potential implications for noble gas geochronology of groundwaters and fission track dating of apatite.https://www.mdpi.com/2076-3263/14/12/358apatiteU-Pbalkali feldspar<sup>40</sup>Ar/<sup>39</sup>ArRb-Srgeochronology |
| spellingShingle | Daniil Popov Richard Spikings André Navin Paul Maria Ovtcharova Massimo Chiaradia Martin Kutzschbach Alexey Ulianov Gary O’Sullivan David Chew Kalin Kouzmanov Eszter Badenszki J. Stephen Daly Joshua H. F. L. Davies Excess <sup>40</sup>Ar in Alkali Feldspar and <sup>206,207</sup>Pb in Apatite Caused by Fluid-Induced Recrystallisation in a Semi-Closed Environment in Proterozoic (Meta)Granites of the Mt Isa Inlier, NE Australia Geosciences apatite U-Pb alkali feldspar <sup>40</sup>Ar/<sup>39</sup>Ar Rb-Sr geochronology |
| title | Excess <sup>40</sup>Ar in Alkali Feldspar and <sup>206,207</sup>Pb in Apatite Caused by Fluid-Induced Recrystallisation in a Semi-Closed Environment in Proterozoic (Meta)Granites of the Mt Isa Inlier, NE Australia |
| title_full | Excess <sup>40</sup>Ar in Alkali Feldspar and <sup>206,207</sup>Pb in Apatite Caused by Fluid-Induced Recrystallisation in a Semi-Closed Environment in Proterozoic (Meta)Granites of the Mt Isa Inlier, NE Australia |
| title_fullStr | Excess <sup>40</sup>Ar in Alkali Feldspar and <sup>206,207</sup>Pb in Apatite Caused by Fluid-Induced Recrystallisation in a Semi-Closed Environment in Proterozoic (Meta)Granites of the Mt Isa Inlier, NE Australia |
| title_full_unstemmed | Excess <sup>40</sup>Ar in Alkali Feldspar and <sup>206,207</sup>Pb in Apatite Caused by Fluid-Induced Recrystallisation in a Semi-Closed Environment in Proterozoic (Meta)Granites of the Mt Isa Inlier, NE Australia |
| title_short | Excess <sup>40</sup>Ar in Alkali Feldspar and <sup>206,207</sup>Pb in Apatite Caused by Fluid-Induced Recrystallisation in a Semi-Closed Environment in Proterozoic (Meta)Granites of the Mt Isa Inlier, NE Australia |
| title_sort | excess sup 40 sup ar in alkali feldspar and sup 206 207 sup pb in apatite caused by fluid induced recrystallisation in a semi closed environment in proterozoic meta granites of the mt isa inlier ne australia |
| topic | apatite U-Pb alkali feldspar <sup>40</sup>Ar/<sup>39</sup>Ar Rb-Sr geochronology |
| url | https://www.mdpi.com/2076-3263/14/12/358 |
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