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Integrated Re-Os, Ar/Ar, and U-Pb geochronology directly dates the timing of mineralization at the Mina Justa and Marcona deposits, Peru.

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Title: Integrated Re-Os, Ar/Ar, and U-Pb geochronology directly dates the timing of mineralization at the Mina Justa and Marcona deposits, Peru.
Authors: Rodríguez-Mustafa, María A.1 maalromu@umich.edu, Simon, Adam C.1, Holder, Robert M.1, Stein, Holly2,3, Kylander-Clark, Andrew R. C.4, Jicha, Brian R.5, Blakemore, Daniel1, Machado, Edson L. B.6
Source: Geological Society of America Bulletin. Jul/Aug2024, Vol. 136 Issue 7/8, p2861-2874. 14p.
Subject Terms: *Rare earth metals, *Argon-argon dating, *Mineralization, *Copper, *Geological time scales, *Ore deposits, *Uranium
Geographic Terms: Peru
Abstract: Iron oxide-copper-gold (IOCG) and iron oxide-apatite (IOA) deposits are important sources of Cu and Fe, respectively. They contain abundant Fe-oxides and may contain Au, Ag, Co, rare earth elements (REEs), U, Ni, and V as economically important by-products. In Peru, the Mina Justa IOCG deposit is located next to the giant Marcona IOA deposit. Constraining the timing of Fe and Cu mineralization at Mina Justa is fundamental to understanding the duration and type of processes that generated this mineral deposit, and ultimately to testing the genetic link with other deposits in the area. Previous authors used alteration minerals to indirectly date Cu mineralization at Mina Justa at around 100 Ma. We report Ar/Ar dates of actinolite, U-Pb dates of magnetite, apatite, and titanite collected by in situ laser-ablation-multicollector-inductively coupled plasma-mass spectrometry, and Re-Os thermal ionization mass spectrometry dates for sulfides. These results indicate that Cu mineralization at Mina Justa occurred at ca. 160 Ma and that Fe mineralization is older and coeval with the neighboring Marcona IOA deposit, consistent with Cu mineralization overprinting IOA-style mineralization at Mina Justa. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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An: 178797902
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Integrated Re-Os, Ar/Ar, and U-Pb geochronology directly dates the timing of mineralization at the Mina Justa and Marcona deposits, Peru.
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  Data: <searchLink fieldCode="JN" term="%22Geological+Society+of+America+Bulletin%22">Geological Society of America Bulletin</searchLink>. Jul/Aug2024, Vol. 136 Issue 7/8, p2861-2874. 14p.
– Name: Subject
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  Data: *<searchLink fieldCode="DE" term="%22Rare+earth+metals%22">Rare earth metals</searchLink><br />*<searchLink fieldCode="DE" term="%22Argon-argon+dating%22">Argon-argon dating</searchLink><br />*<searchLink fieldCode="DE" term="%22Mineralization%22">Mineralization</searchLink><br />*<searchLink fieldCode="DE" term="%22Copper%22">Copper</searchLink><br />*<searchLink fieldCode="DE" term="%22Geological+time+scales%22">Geological time scales</searchLink><br />*<searchLink fieldCode="DE" term="%22Ore+deposits%22">Ore deposits</searchLink><br />*<searchLink fieldCode="DE" term="%22Uranium%22">Uranium</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Peru%22">Peru</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Iron oxide-copper-gold (IOCG) and iron oxide-apatite (IOA) deposits are important sources of Cu and Fe, respectively. They contain abundant Fe-oxides and may contain Au, Ag, Co, rare earth elements (REEs), U, Ni, and V as economically important by-products. In Peru, the Mina Justa IOCG deposit is located next to the giant Marcona IOA deposit. Constraining the timing of Fe and Cu mineralization at Mina Justa is fundamental to understanding the duration and type of processes that generated this mineral deposit, and ultimately to testing the genetic link with other deposits in the area. Previous authors used alteration minerals to indirectly date Cu mineralization at Mina Justa at around 100 Ma. We report Ar/Ar dates of actinolite, U-Pb dates of magnetite, apatite, and titanite collected by in situ laser-ablation-multicollector-inductively coupled plasma-mass spectrometry, and Re-Os thermal ionization mass spectrometry dates for sulfides. These results indicate that Cu mineralization at Mina Justa occurred at ca. 160 Ma and that Fe mineralization is older and coeval with the neighboring Marcona IOA deposit, consistent with Cu mineralization overprinting IOA-style mineralization at Mina Justa. [ABSTRACT FROM AUTHOR]
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        Value: 10.1130/B36904.1
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      – Code: eng
        Text: English
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        PageCount: 14
        StartPage: 2861
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      – SubjectFull: Rare earth metals
        Type: general
      – SubjectFull: Argon-argon dating
        Type: general
      – SubjectFull: Mineralization
        Type: general
      – SubjectFull: Copper
        Type: general
      – SubjectFull: Geological time scales
        Type: general
      – SubjectFull: Ore deposits
        Type: general
      – SubjectFull: Uranium
        Type: general
      – SubjectFull: Peru
        Type: general
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      – TitleFull: Integrated Re-Os, Ar/Ar, and U-Pb geochronology directly dates the timing of mineralization at the Mina Justa and Marcona deposits, Peru.
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            – D: 01
              M: 07
              Text: Jul/Aug2024
              Type: published
              Y: 2024
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              Value: 136
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