Structure and timing of Neoarchean gold mineralization in the Southern Cross district (Yilgarn Craton, Western Australia) suggest leading role of late Low-Ca I-type granite intrusions

Michael Doublier, Nicolas Thebaud, Michael Wingate, S.S. Romano, C.L. Kirkland, Klaus Gessner, David Mole, N.J. Evans

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    Abstract

    © 2014 Published by Elsevier Ltd. The formation of structurally controlled lode-gold deposits is a controversial subject with both magmatic and metamorphic fluids considered a feasible source for gold. Here we present a study from the Southern Cross district (Yilgarn Craton, Western Australia), where structurally controlled Neoarchean gold deposits are hosted in amphibolite facies greenstones. We combine geochronological data with structural analysis to constrain the timing and structural control of ore deposition. We show that gold mineralization took place between c. 2638 and 2630Ma, contemporaneous with the onset of voluminous intrusions of Low-Ca, I-type granites, which are ubiquitous in Southern Cross and elsewhere in the Yilgarn Craton. We argue that the timing of the intrusions, their spatial association with gold deposits, their chemical composition, and isotopic signature are consistent with Low-Ca granites being a major fluid source for mineralization. We propose that the fluid release by cooling plutons was facilitated by transport along active amphibolite facies shear zones. As gold mineralization was synchronous with Low-Ca magmatism across large areas of the Yilgarn Craton, our model may be applicable to orogenic gold deposits in other parts of the Yilgarn Craton as well as other Archean granite-greenstone terrains with a 'late granite bloom'.
    Original languageEnglish
    Pages (from-to)205-221
    Number of pages17
    JournalJournal of Structural Geology
    Volume67
    Early online date11 Mar 2014
    DOIs
    Publication statusPublished - Oct 2014

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    craton
    granite
    gold
    mineralization
    greenstone
    amphibolite facies
    fluid
    structural control
    structural analysis
    pluton
    shear zone
    magmatism
    Archean
    algal bloom
    chemical composition
    cooling

    Cite this

    @article{1b12a33ce3fe41e9b061d5a50cf4d138,
    title = "Structure and timing of Neoarchean gold mineralization in the Southern Cross district (Yilgarn Craton, Western Australia) suggest leading role of late Low-Ca I-type granite intrusions",
    abstract = "{\circledC} 2014 Published by Elsevier Ltd. The formation of structurally controlled lode-gold deposits is a controversial subject with both magmatic and metamorphic fluids considered a feasible source for gold. Here we present a study from the Southern Cross district (Yilgarn Craton, Western Australia), where structurally controlled Neoarchean gold deposits are hosted in amphibolite facies greenstones. We combine geochronological data with structural analysis to constrain the timing and structural control of ore deposition. We show that gold mineralization took place between c. 2638 and 2630Ma, contemporaneous with the onset of voluminous intrusions of Low-Ca, I-type granites, which are ubiquitous in Southern Cross and elsewhere in the Yilgarn Craton. We argue that the timing of the intrusions, their spatial association with gold deposits, their chemical composition, and isotopic signature are consistent with Low-Ca granites being a major fluid source for mineralization. We propose that the fluid release by cooling plutons was facilitated by transport along active amphibolite facies shear zones. As gold mineralization was synchronous with Low-Ca magmatism across large areas of the Yilgarn Craton, our model may be applicable to orogenic gold deposits in other parts of the Yilgarn Craton as well as other Archean granite-greenstone terrains with a 'late granite bloom'.",
    author = "Michael Doublier and Nicolas Thebaud and Michael Wingate and S.S. Romano and C.L. Kirkland and Klaus Gessner and David Mole and N.J. Evans",
    year = "2014",
    month = "10",
    doi = "10.1016/j.jsg.2014.02.009",
    language = "English",
    volume = "67",
    pages = "205--221",
    journal = "Journal of Structural Geology",
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    TY - JOUR

    T1 - Structure and timing of Neoarchean gold mineralization in the Southern Cross district (Yilgarn Craton, Western Australia) suggest leading role of late Low-Ca I-type granite intrusions

    AU - Doublier, Michael

    AU - Thebaud, Nicolas

    AU - Wingate, Michael

    AU - Romano, S.S.

    AU - Kirkland, C.L.

    AU - Gessner, Klaus

    AU - Mole, David

    AU - Evans, N.J.

    PY - 2014/10

    Y1 - 2014/10

    N2 - © 2014 Published by Elsevier Ltd. The formation of structurally controlled lode-gold deposits is a controversial subject with both magmatic and metamorphic fluids considered a feasible source for gold. Here we present a study from the Southern Cross district (Yilgarn Craton, Western Australia), where structurally controlled Neoarchean gold deposits are hosted in amphibolite facies greenstones. We combine geochronological data with structural analysis to constrain the timing and structural control of ore deposition. We show that gold mineralization took place between c. 2638 and 2630Ma, contemporaneous with the onset of voluminous intrusions of Low-Ca, I-type granites, which are ubiquitous in Southern Cross and elsewhere in the Yilgarn Craton. We argue that the timing of the intrusions, their spatial association with gold deposits, their chemical composition, and isotopic signature are consistent with Low-Ca granites being a major fluid source for mineralization. We propose that the fluid release by cooling plutons was facilitated by transport along active amphibolite facies shear zones. As gold mineralization was synchronous with Low-Ca magmatism across large areas of the Yilgarn Craton, our model may be applicable to orogenic gold deposits in other parts of the Yilgarn Craton as well as other Archean granite-greenstone terrains with a 'late granite bloom'.

    AB - © 2014 Published by Elsevier Ltd. The formation of structurally controlled lode-gold deposits is a controversial subject with both magmatic and metamorphic fluids considered a feasible source for gold. Here we present a study from the Southern Cross district (Yilgarn Craton, Western Australia), where structurally controlled Neoarchean gold deposits are hosted in amphibolite facies greenstones. We combine geochronological data with structural analysis to constrain the timing and structural control of ore deposition. We show that gold mineralization took place between c. 2638 and 2630Ma, contemporaneous with the onset of voluminous intrusions of Low-Ca, I-type granites, which are ubiquitous in Southern Cross and elsewhere in the Yilgarn Craton. We argue that the timing of the intrusions, their spatial association with gold deposits, their chemical composition, and isotopic signature are consistent with Low-Ca granites being a major fluid source for mineralization. We propose that the fluid release by cooling plutons was facilitated by transport along active amphibolite facies shear zones. As gold mineralization was synchronous with Low-Ca magmatism across large areas of the Yilgarn Craton, our model may be applicable to orogenic gold deposits in other parts of the Yilgarn Craton as well as other Archean granite-greenstone terrains with a 'late granite bloom'.

    U2 - 10.1016/j.jsg.2014.02.009

    DO - 10.1016/j.jsg.2014.02.009

    M3 - Article

    VL - 67

    SP - 205

    EP - 221

    JO - Journal of Structural Geology

    JF - Journal of Structural Geology

    SN - 0191-8141

    ER -