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LA-ICPMS and EPMA studies of pyrite, arsenopyrite and loellingite from the Bhukia-Jagpura gold prospect, southern Rajasthan, India: Implications for ore genesis and gold remobilization

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Title: LA-ICPMS and EPMA studies of pyrite, arsenopyrite and loellingite from the Bhukia-Jagpura gold prospect, southern Rajasthan, India: Implications for ore genesis and gold remobilization
Authors: Deol, S.1 swatideol@yahoo.com, Deb, M.1, Large, Ross R.2, Gilbert, Sarah2
Source: Chemical Geology. Oct2012, Vol. 326-327, p72-87. 16p.
Subjects: Inductively coupled plasma mass spectrometry, Arsenopyrite, Magmas, Iron sulfides, Gold, Metamorphism (Geology)
Geographic Terms: Rajasthan (India), India
Abstract: Abstract: The Bhukia-Jagpura gold prospect is hosted by a Paleoproterozoic metasedimentary rock sequence that constitutes the lowermost part of the Aravalli Supergroup, lying in close proximity to the basement-cover contact. A combined ore petrographic, LA-ICPMS and EPMA studies of iron sulfides and sulfarsenides from the prospect has revealed four varieties of pyrite and two varieties of arsenopyrite with different trace element compositions. The data indicates a sedimentary-diagenetic origin for the earliest Pyrites (Py) I and II, which are devoid of any gold, in contrast to hydrothermal Py III and IV with a minor, but significant content of invisible gold (0.3–1.6ppm). Associated loellingite (35–51ppm) and Arsenopyrite (Aspy) I (0.28–10ppm) contain the maximum concentration of invisible gold, while it is substantially lower in Aspy II (0.06–1.5ppm). The compositions of the gold-bearing pyrites (low Ni:Co ratios), arsenopyrites and loellingite (rich in Co), and the presence of Au–Bi–Te mineral phases within arsenopyrite, support a magmatic hydrothermal model for the origin of gold–sulfide mineralization, which appears to have taken place during the peak of regional metamorphism, or at an earlier stage. The different stages of deformation and metamorphism released and remobilized gold in invisible and discrete forms from the sulfarsenides. During prograde metamorphism of Aspy I, gold was partially incorporated and relatively enriched within the structure of loellingite. Later, during retrograde metamorphism gold was exsolved as visible grains at the interface of loellingite and Aspy II and/or within loellingite. [Copyright &y& Elsevier]
Copyright of Chemical Geology 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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  Data: LA-ICPMS and EPMA studies of pyrite, arsenopyrite and loellingite from the Bhukia-Jagpura gold prospect, southern Rajasthan, India: Implications for ore genesis and gold remobilization
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  Data: <searchLink fieldCode="AR" term="%22Deol%2C+S%2E%22">Deol, S.</searchLink><relatesTo>1</relatesTo><i> swatideol@yahoo.com</i><br /><searchLink fieldCode="AR" term="%22Deb%2C+M%2E%22">Deb, M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Large%2C+Ross+R%2E%22">Large, Ross R.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Gilbert%2C+Sarah%22">Gilbert, Sarah</searchLink><relatesTo>2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Chemical+Geology%22">Chemical Geology</searchLink>. Oct2012, Vol. 326-327, p72-87. 16p.
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  Data: <searchLink fieldCode="DE" term="%22Inductively+coupled+plasma+mass+spectrometry%22">Inductively coupled plasma mass spectrometry</searchLink><br /><searchLink fieldCode="DE" term="%22Arsenopyrite%22">Arsenopyrite</searchLink><br /><searchLink fieldCode="DE" term="%22Magmas%22">Magmas</searchLink><br /><searchLink fieldCode="DE" term="%22Iron+sulfides%22">Iron sulfides</searchLink><br /><searchLink fieldCode="DE" term="%22Gold%22">Gold</searchLink><br /><searchLink fieldCode="DE" term="%22Metamorphism+%28Geology%29%22">Metamorphism (Geology)</searchLink>
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  Data: Abstract: The Bhukia-Jagpura gold prospect is hosted by a Paleoproterozoic metasedimentary rock sequence that constitutes the lowermost part of the Aravalli Supergroup, lying in close proximity to the basement-cover contact. A combined ore petrographic, LA-ICPMS and EPMA studies of iron sulfides and sulfarsenides from the prospect has revealed four varieties of pyrite and two varieties of arsenopyrite with different trace element compositions. The data indicates a sedimentary-diagenetic origin for the earliest Pyrites (Py) I and II, which are devoid of any gold, in contrast to hydrothermal Py III and IV with a minor, but significant content of invisible gold (0.3–1.6ppm). Associated loellingite (35–51ppm) and Arsenopyrite (Aspy) I (0.28–10ppm) contain the maximum concentration of invisible gold, while it is substantially lower in Aspy II (0.06–1.5ppm). The compositions of the gold-bearing pyrites (low Ni:Co ratios), arsenopyrites and loellingite (rich in Co), and the presence of Au–Bi–Te mineral phases within arsenopyrite, support a magmatic hydrothermal model for the origin of gold–sulfide mineralization, which appears to have taken place during the peak of regional metamorphism, or at an earlier stage. The different stages of deformation and metamorphism released and remobilized gold in invisible and discrete forms from the sulfarsenides. During prograde metamorphism of Aspy I, gold was partially incorporated and relatively enriched within the structure of loellingite. Later, during retrograde metamorphism gold was exsolved as visible grains at the interface of loellingite and Aspy II and/or within loellingite. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Chemical Geology 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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      – Type: doi
        Value: 10.1016/j.chemgeo.2012.07.017
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      – Code: eng
        Text: English
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        PageCount: 16
        StartPage: 72
    Subjects:
      – SubjectFull: Inductively coupled plasma mass spectrometry
        Type: general
      – SubjectFull: Arsenopyrite
        Type: general
      – SubjectFull: Magmas
        Type: general
      – SubjectFull: Iron sulfides
        Type: general
      – SubjectFull: Gold
        Type: general
      – SubjectFull: Metamorphism (Geology)
        Type: general
      – SubjectFull: Rajasthan (India)
        Type: general
      – SubjectFull: India
        Type: general
    Titles:
      – TitleFull: LA-ICPMS and EPMA studies of pyrite, arsenopyrite and loellingite from the Bhukia-Jagpura gold prospect, southern Rajasthan, India: Implications for ore genesis and gold remobilization
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            NameFull: Deol, S.
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            NameFull: Deb, M.
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            NameFull: Large, Ross R.
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            NameFull: Gilbert, Sarah
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              Text: Oct2012
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              Y: 2012
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              Value: 00092541
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              Value: 326-327
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            – TitleFull: Chemical Geology
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