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Apatite in situ Lu-Hf and U-Pb geochronology in layered mafic intrusions.

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Title: Apatite in situ Lu-Hf and U-Pb geochronology in layered mafic intrusions.
Authors: Kharkongor, Melissa1 (AUTHOR) melissa.kharkongor@adelaide.edu.au, Glorie, Stijn1 (AUTHOR), Abersteiner, Adam1,2 (AUTHOR), Dare, Sarah3 (AUTHOR), Kirkland, Christopher4 (AUTHOR), Chew, David5 (AUTHOR), Mulder, Jacob1 (AUTHOR), Gilbert, Sarah6 (AUTHOR)
Source: Geochimica et Cosmochimica Acta. Sep2025, Vol. 404, p234-256. 23p.
Subjects: Apatite, Mafic rocks, Uranium-lead dating, Laser ablation inductively coupled plasma mass spectrometry, Radioactive dating, Igneous intrusions, Petrogenesis, Ore deposits
Abstract: Layered Mafic Intrusions (LMI) represent the solidified remnants of basaltic magma chambers and provide important insights for understanding subsurface igneous processes, including those linked to the formation of economic deposits of Fe-Ni-Cu-Co sulphides, platinum group elements (PGE), Cr-Fe-Ti-V-oxides and apatite. However, constraining the timing of emplacement of LMI can be challenging, as datable minerals like zircon have a relatively low abundance in mafic rocks. In this study, we use apatite, a common accessory mineral in mafic rocks that can reach high modal abundances in the most evolved parts of LMI to evaluate the robustness of the in-situ U-Pb and Lu-Hf dating methods by laser ablation – inductively coupled plasma – reaction cell mass spectrometry (LA-ICP-MS/MS) for constraining the timing of LMI petrogenesis. We present in-situ apatite U-Pb and Lu-Hf dates from apatite-rich lithologies from four major LMI localities: the Fe-Ti Boulder Lake North deposit (Duluth Complex, USA), the Upper Zone (Bushveld Complex, South Africa), the Nebo-Babel Intrusion (Giles Complex, Musgrave Province, Australia), and the Proterozoic anorthosite massifs of the Grader Intrusion and Lac Perron deposit (Grenville Province, Canada). Trace element discrimination plots, coupled with petrological data, indicate that apatite from all four localities exhibit typical mafic compositions and are classified as cumulus apatite. The U-Pb dates in apatite either represent primary magmatic ages or exhibit varying degrees of Pb-loss, as seen in the Nebo-Babel intrusion, and in the Bushveld Complex, where the degree of Pb loss is dependent on apatite crystal size. In contrast, the apatite Lu-Hf system is undisturbed and records primary LMI crystallisation ages as demonstrated for the Duluth and Bushveld Complexes, and Nebo-Babel intrusion. In the Grenville Province, the long-lived magmatic systems likely record younger apatite growth ages compared to zircon ages. Hence, this study demonstrates in-situ LA-ICP-MS/MS Lu-Hf of apatite as a robust tool for obtaining primary magmatic ages of LMI. [ABSTRACT FROM AUTHOR]
Copyright of Geochimica et Cosmochimica Acta is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 187530621
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
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  Data: Apatite in situ Lu-Hf and U-Pb geochronology in layered mafic intrusions.
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  Data: <searchLink fieldCode="AR" term="%22Kharkongor%2C+Melissa%22">Kharkongor, Melissa</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> melissa.kharkongor@adelaide.edu.au</i><br /><searchLink fieldCode="AR" term="%22Glorie%2C+Stijn%22">Glorie, Stijn</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Abersteiner%2C+Adam%22">Abersteiner, Adam</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Dare%2C+Sarah%22">Dare, Sarah</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kirkland%2C+Christopher%22">Kirkland, Christopher</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chew%2C+David%22">Chew, David</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mulder%2C+Jacob%22">Mulder, Jacob</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gilbert%2C+Sarah%22">Gilbert, Sarah</searchLink><relatesTo>6</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Geochimica+et+Cosmochimica+Acta%22">Geochimica et Cosmochimica Acta</searchLink>. Sep2025, Vol. 404, p234-256. 23p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Apatite%22">Apatite</searchLink><br /><searchLink fieldCode="DE" term="%22Mafic+rocks%22">Mafic rocks</searchLink><br /><searchLink fieldCode="DE" term="%22Uranium-lead+dating%22">Uranium-lead dating</searchLink><br /><searchLink fieldCode="DE" term="%22Laser+ablation+inductively+coupled+plasma+mass+spectrometry%22">Laser ablation inductively coupled plasma mass spectrometry</searchLink><br /><searchLink fieldCode="DE" term="%22Radioactive+dating%22">Radioactive dating</searchLink><br /><searchLink fieldCode="DE" term="%22Igneous+intrusions%22">Igneous intrusions</searchLink><br /><searchLink fieldCode="DE" term="%22Petrogenesis%22">Petrogenesis</searchLink><br /><searchLink fieldCode="DE" term="%22Ore+deposits%22">Ore deposits</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Layered Mafic Intrusions (LMI) represent the solidified remnants of basaltic magma chambers and provide important insights for understanding subsurface igneous processes, including those linked to the formation of economic deposits of Fe-Ni-Cu-Co sulphides, platinum group elements (PGE), Cr-Fe-Ti-V-oxides and apatite. However, constraining the timing of emplacement of LMI can be challenging, as datable minerals like zircon have a relatively low abundance in mafic rocks. In this study, we use apatite, a common accessory mineral in mafic rocks that can reach high modal abundances in the most evolved parts of LMI to evaluate the robustness of the in-situ U-Pb and Lu-Hf dating methods by laser ablation – inductively coupled plasma – reaction cell mass spectrometry (LA-ICP-MS/MS) for constraining the timing of LMI petrogenesis. We present in-situ apatite U-Pb and Lu-Hf dates from apatite-rich lithologies from four major LMI localities: the Fe-Ti Boulder Lake North deposit (Duluth Complex, USA), the Upper Zone (Bushveld Complex, South Africa), the Nebo-Babel Intrusion (Giles Complex, Musgrave Province, Australia), and the Proterozoic anorthosite massifs of the Grader Intrusion and Lac Perron deposit (Grenville Province, Canada). Trace element discrimination plots, coupled with petrological data, indicate that apatite from all four localities exhibit typical mafic compositions and are classified as cumulus apatite. The U-Pb dates in apatite either represent primary magmatic ages or exhibit varying degrees of Pb-loss, as seen in the Nebo-Babel intrusion, and in the Bushveld Complex, where the degree of Pb loss is dependent on apatite crystal size. In contrast, the apatite Lu-Hf system is undisturbed and records primary LMI crystallisation ages as demonstrated for the Duluth and Bushveld Complexes, and Nebo-Babel intrusion. In the Grenville Province, the long-lived magmatic systems likely record younger apatite growth ages compared to zircon ages. Hence, this study demonstrates in-situ LA-ICP-MS/MS Lu-Hf of apatite as a robust tool for obtaining primary magmatic ages of LMI. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Geochimica et Cosmochimica Acta is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.gca.2025.07.027
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 23
        StartPage: 234
    Subjects:
      – SubjectFull: Apatite
        Type: general
      – SubjectFull: Mafic rocks
        Type: general
      – SubjectFull: Uranium-lead dating
        Type: general
      – SubjectFull: Laser ablation inductively coupled plasma mass spectrometry
        Type: general
      – SubjectFull: Radioactive dating
        Type: general
      – SubjectFull: Igneous intrusions
        Type: general
      – SubjectFull: Petrogenesis
        Type: general
      – SubjectFull: Ore deposits
        Type: general
    Titles:
      – TitleFull: Apatite in situ Lu-Hf and U-Pb geochronology in layered mafic intrusions.
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              M: 09
              Text: Sep2025
              Type: published
              Y: 2025
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