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• W166178659 abstract "The Eastern Succession of the Proterozoic Mt Isa Block, including theCloncurry District and the Mary Kathleen Fold Belt (MKFB), contains numerousexamples of Fe-oxide-Cu-Au mineralisation. Most deposits, including ErnestHenry, Eloise, Starra and Mt Elliott formed after the peak of ca. 1600-1575 Maupper greenschist to amphibolite facies metamorphism, and during the waningphases of the Isan Orogeny. Mineralisation was broadly synchronous withemplacement of voluminous phases of the Williams and Naraku batholiths (ca. 1550- 1500 Ma) and widespread brecciation and accompanying metasomatism.Brecciation and metasomatism were best developed within Cover Sequence 2stratigraphy, and in particular within calc-silicate rock and meta-siltstonestratigraphy of the Corella Formation, the predominant rocks of the Mary KathleenGroup.The geometry and distribution of brecciation in the Corella Formation wasin part controlled by retrograde buckle folding imposed on a heterogeneous rocksequence that was fractured and boudinaged both pre- and syn-buckle folding.Brecciation is far more widespread in the Cloncurry District relative to the MKFB,reflecting in part a larger proportion of stratigraphy in the Cloncurry District thatwas at low angles to the shortening direction during the waning phases of the IsanOrogeny, favoring refolding and consequent fracturing. Variations in regionalstructural trends reflect strain partitioning around competent intrusive bodies, faultreactivation and refolding. Other contributing factors for brecciation include lowtemperature conditions during late deformation, and the proximity to voluminousintrusions, the emplacement of which likely resulted in transient elevated fluidpressure and strain rates, favoring fracturing and brecciation. The relative paucity ofbrecciation in most stratigraphic units outside of the Corella Formation reflects ahigh proportion of incompetent stratigraphy in these sequences (e.g. voluminousmicaceous schists within the Soldiers Cap Group), which were able to• accommodatestrain by plastic flow.The broad-scale geometry of the Cloncurry District reflects Cover Sequence3 rocks overlying Cover Sequence 2 rocks, the two sequences being separated byearly faults. Marbles within the Corella Formation, and schists in other stratigraphicsequences were not prone to brittle failure, and acted as low permeability barriers tofluid flow. These horizons allowed for the attainment of elevated fluid pressureswithin large volumes of brecciated rock. During the final stages of brecciation, theselow competence marbles and schists were fractured and brecciated, predominantlywithin discrete fault zones. This shift from widespread brittle-ductile to purelybrittle deformation likely reflects progressive cooling, as well as locally elevatedfluid pressure and/or strain rate associated with pluton emplacement and degassing.A synchronous district-scale shift from compression to transtension facilitated thedevelopment of vertically continuous zones of dilation within faults, resulting invery large fluid pressure gradients and catastrophic fault valving.Brecciation was accompanied by widespread metasomatism that ranges fromhigh temperature (400° - 600°C) Na-(Ca)-rich assemblages (e.g. albite ± actinolite,clinopyroxene, scapolite, magnetite, titanite, etc.) to retrograde (<400°C) chloriticassemblages. Interpretation of stable (0 and C) and radiogenic (Sr) isotopes andmineral chemistry is consistent with this spectrum of alteration assemblagesreflecting metasomatic fluids of two predominant origins. The oxygen and carbonisotopic signature of carbonates from Na-(Ca) assemblages indicates that fluidsresponsible for this style of alteration were not simply equilibrated with magmaticrocks, but were exsolved from crystallizing plutons. Low temperature, low salinityfluids of inferred meteoric origin were introduced late in the paragenesis, and do notappear to have contributed significantly to the mass budgets of eu-Au ore systemsin the district.Extensive fluid-wallrock interaction prior to mineralisation appears to havebeen important in the genesis of some deposits that record K- and Fe-rich alterationhaloes, including for example the Ernest Henry deposit. However, the occurrence of skarn-like, intrusion-proximal mineralisation that lacks significant K- and Fe enrichmentat for example Mt Elliott, indicates that fluid-wallrock interaction wasnot a necessary precursor for all styles of Cu-Au mineralisation in the CloncurryDistrict." @default.
• W166178659 created "2016-06-24" @default.
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• W166178659 date "2003-05-01" @default.
• W166178659 modified "2023-09-23" @default.
• W166178659 title "Brecciation within the Mary Kathleen Group of the Eastern Succession, Mt Isa Block, Australia: Implications of district-scale structural and metasomatic processes for Fe-oxide-Cu-Au mineralisation" @default.
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