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Hydrothermal alteration and gold mineralization of the Awak Mas metasedimentary rock-hosted gold deposit, Sulawesi, Indonesia.

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Title: Hydrothermal alteration and gold mineralization of the Awak Mas metasedimentary rock-hosted gold deposit, Sulawesi, Indonesia.
Authors: Ernowo, Ernowo1 (AUTHOR) ernowo.1972@esdm.go.id, Meyer, Franz Michael1 (AUTHOR), Idrus, Arifudin1 (AUTHOR)
Source: Ore Geology Reviews. Oct2019, Vol. 113, pN.PAG-N.PAG. 1p.
Subjects: Hydrothermal alteration, Gold, Bromine, Pyrites, Sedimentary rocks, Fluid inclusions, Mineralization, Siderite
Geographic Terms: Sulawesi (Indonesia), Indonesia
Abstract: • The Awak Mas gold deposit is hosted by phyllites and schists. • Mineralized zone is characterized by the mineral assemblage albite-ankerite-pyrite. • Au-mineralizing veins are quartz-albite-ankerite and quartz-ankerite-siderite. • The ore fluids were derived from metamorphic dewatering of sedimentary rocks. • The Awak Mas deposit is an orogenic gold deposit. • The gold deposit developed at the transition between the epizone and the mesozone. The Awak Mas gold deposit is hosted by phyllites and schists. Indicated and infered resource are around 38.4 Mt at 1.41 g/t Au, equaling to total resource of 1.74 Moz gold. Hydrothermal alteration zones proximal to the gold-bearing veins, are characterized by the mineral assemblage albite-ankerite-pyrite and marked by elevated Na/Al ratios and depleted 3*K/Al ratios. These changes are manifested by the replacement of muscovite by albite. Carbonate alteration with ankerite and siderite occured simultaneous to albitization proximal to the veins. Distal alteration zones are characterized by chlorite-albite in phyllites, and albite-quartz in schists. There are two types of Au-mineralizing veins in the deposit, namely quartz-albite-ankerite veins and quartz-ankerite-siderite veins. Gold occurs in pyrite as sub-microscopic inclusions and as fracture fillings with a gold fineness of 925–935 and Au/Ag ratios between 12:1 and 14:1. The aqueous ore fluid was CO 2 -poor and of low salinity with homogenization temperatures between 275 and 325 °C. Fluid inclusion leachates have Br/Cl ratios between 1.0 and 2.0 × 10−3 and I/Cl ratios of 5.6 to 18.3 × 10−5 suggesting that the ore fluids were derived from metamorphic dewatering of organic-rich marine sedimentary rocks. On the other hand, Br/Cl ratios between 1.6 and 3.0 × 10−3 and I/Cl ratios from 5.1 to 10.6 × 10−5 in the non-mineralized veins indicate an input of magmatic hydrothermal fluids. The results of this study show that the Awak Mas deposit is an epigenetic, orogenic gold deposit, which developed at the transition between the epizone and the mesozone. [ABSTRACT FROM AUTHOR]
Copyright of Ore Geology Reviews is the property of Elsevier B.V. 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.)
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  Label: Title
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  Data: Hydrothermal alteration and gold mineralization of the Awak Mas metasedimentary rock-hosted gold deposit, Sulawesi, Indonesia.
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  Data: <searchLink fieldCode="AR" term="%22Ernowo%2C+Ernowo%22">Ernowo, Ernowo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> ernowo.1972@esdm.go.id</i><br /><searchLink fieldCode="AR" term="%22Meyer%2C+Franz+Michael%22">Meyer, Franz Michael</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Idrus%2C+Arifudin%22">Idrus, Arifudin</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Ore+Geology+Reviews%22">Ore Geology Reviews</searchLink>. Oct2019, Vol. 113, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Hydrothermal+alteration%22">Hydrothermal alteration</searchLink><br /><searchLink fieldCode="DE" term="%22Gold%22">Gold</searchLink><br /><searchLink fieldCode="DE" term="%22Bromine%22">Bromine</searchLink><br /><searchLink fieldCode="DE" term="%22Pyrites%22">Pyrites</searchLink><br /><searchLink fieldCode="DE" term="%22Sedimentary+rocks%22">Sedimentary rocks</searchLink><br /><searchLink fieldCode="DE" term="%22Fluid+inclusions%22">Fluid inclusions</searchLink><br /><searchLink fieldCode="DE" term="%22Mineralization%22">Mineralization</searchLink><br /><searchLink fieldCode="DE" term="%22Siderite%22">Siderite</searchLink>
– Name: SubjectGeographic
  Label: Geographic Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Sulawesi+%28Indonesia%29%22">Sulawesi (Indonesia)</searchLink><br /><searchLink fieldCode="DE" term="%22Indonesia%22">Indonesia</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: • The Awak Mas gold deposit is hosted by phyllites and schists. • Mineralized zone is characterized by the mineral assemblage albite-ankerite-pyrite. • Au-mineralizing veins are quartz-albite-ankerite and quartz-ankerite-siderite. • The ore fluids were derived from metamorphic dewatering of sedimentary rocks. • The Awak Mas deposit is an orogenic gold deposit. • The gold deposit developed at the transition between the epizone and the mesozone. The Awak Mas gold deposit is hosted by phyllites and schists. Indicated and infered resource are around 38.4 Mt at 1.41 g/t Au, equaling to total resource of 1.74 Moz gold. Hydrothermal alteration zones proximal to the gold-bearing veins, are characterized by the mineral assemblage albite-ankerite-pyrite and marked by elevated Na/Al ratios and depleted 3*K/Al ratios. These changes are manifested by the replacement of muscovite by albite. Carbonate alteration with ankerite and siderite occured simultaneous to albitization proximal to the veins. Distal alteration zones are characterized by chlorite-albite in phyllites, and albite-quartz in schists. There are two types of Au-mineralizing veins in the deposit, namely quartz-albite-ankerite veins and quartz-ankerite-siderite veins. Gold occurs in pyrite as sub-microscopic inclusions and as fracture fillings with a gold fineness of 925–935 and Au/Ag ratios between 12:1 and 14:1. The aqueous ore fluid was CO 2 -poor and of low salinity with homogenization temperatures between 275 and 325 °C. Fluid inclusion leachates have Br/Cl ratios between 1.0 and 2.0 × 10−3 and I/Cl ratios of 5.6 to 18.3 × 10−5 suggesting that the ore fluids were derived from metamorphic dewatering of organic-rich marine sedimentary rocks. On the other hand, Br/Cl ratios between 1.6 and 3.0 × 10−3 and I/Cl ratios from 5.1 to 10.6 × 10−5 in the non-mineralized veins indicate an input of magmatic hydrothermal fluids. The results of this study show that the Awak Mas deposit is an epigenetic, orogenic gold deposit, which developed at the transition between the epizone and the mesozone. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Ore Geology Reviews is the property of Elsevier B.V. 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.oregeorev.2019.103083
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Hydrothermal alteration
        Type: general
      – SubjectFull: Gold
        Type: general
      – SubjectFull: Bromine
        Type: general
      – SubjectFull: Pyrites
        Type: general
      – SubjectFull: Sedimentary rocks
        Type: general
      – SubjectFull: Fluid inclusions
        Type: general
      – SubjectFull: Mineralization
        Type: general
      – SubjectFull: Siderite
        Type: general
      – SubjectFull: Sulawesi (Indonesia)
        Type: general
      – SubjectFull: Indonesia
        Type: general
    Titles:
      – TitleFull: Hydrothermal alteration and gold mineralization of the Awak Mas metasedimentary rock-hosted gold deposit, Sulawesi, Indonesia.
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            NameFull: Ernowo, Ernowo
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            NameFull: Meyer, Franz Michael
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            NameFull: Idrus, Arifudin
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          Dates:
            – D: 01
              M: 10
              Text: Oct2019
              Type: published
              Y: 2019
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              Value: 01691368
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              Value: 113
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