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• W5243894 abstract "Australia contains a series of geographically diverse and economically important Paleo- tonMesoproterozoic crustal blocks. Understanding the crustal evolution and possible correlation ofnthese blocks is important for development of mineral exploration strategies. The Peake and DenisonnRanges in South Australia comprise the largest outcrop of Paleo- to Mesoproterozoic rocks in thennorthern Gawler Craton. They are of potential economic significance as they lie within the samenstructural corridor as the giant Olympic Dam U-Cu-Au-Ag deposit, and contain volcanic andnintrusive rocks of similar age to those found in the metallogenic Mt Isa block. Based on detailednmapping, this thesis documents a study of crustal evolution from a geochemical and isotopicnperspective. Important considerations were to determine the timing and character of magmatic andnmetamorphic events, and to develop the correct use of the geochemical and isotope information tondetermine magma sources and possible tectonic environments.n The first geological event in the Peake and Denison Ranges is recorded indirectly in the tracenelement and isotopic composition of a suite of ~1800 Ma year old subalkaline metaigneous rocksnin Kingston and Peake and Coppertop Blocks. Modelling of their Sm-Nd systematics demonstratesnthat their arc signature is unlikely to have resulted from contamination by continental crust or bynsubduction-derived sediment, but was instead inherited from a mantle source that wasnmetasomatised by subduction-derived fluids at ~2500 Ma. In Kingston Block, subalkalinenmagmatism was accompanied by the intrusion of alkaline magmas with plume-type chemicalnsignatures. Supracrustal sequences deposited at this time consist of mature sandstone, mudstonenand minor carbonate. A second magmatic cycle is recorded in ~1746 Ma felsic volcanism innDavenport Block. Concomitant sedimentation included deposition of sandstone, dolomiticnsandstone, calcareous mudstones, minor ironstones, and possible tuffs. Metarhyolites andngranitoids associated with this event are weakly to strongly altered but their chemicalncharacteristics suggest that they may be plume-related magmas. Possibly syntectonic intrusion ofnan unusual clinopyroxene-bearing metatrondhjemite/tonalite body at Lagoon Hills occurred at 1733np 13 Ma.n In Kingston and Algebuckina Blocks, metamorphism is evident in the occurrence ofnmigmatised pelites and the presence of relict cordierite and fibrolitic sillimanite in quartzite andnmetapelite. Geothermobarometry on a sillimanite-cordierite-biotite-quartz gametite indicates thatnpeak metamorphic conditions reached 0.5 GPa and 650dC. The timing of this metamorphic eventn(M1) was determined by the weighted mean of two separate Pb-Pb garnet isochron dates fromnAlgebuckina and Kingston Blocks ~1718 p 31 Ma. A second metamorphic event (M2) occurrednbetween 1530-1450 Ma and is recorded in metamorphic rims on zircon (1530 Ma), 207Pb/206Pbnages of titanite and apatite (1507-1446 Ma), and Rb-Sr whole rock-mineral ages (1477 p 8 Ma andn1451 p 6 Ma). Mineral assemblages produced by M2 are best developed in Davenport Blockn(homblende+biotite mantling clinopyroxene, oblique muscovite) and suggest that lower amphibolitenfacies conditions were reached. The timing of metasomatism, which formed quartz-albite hostednbreccias and Na-Ca-Fe alteration in Davenport Block, is unknown, but constrained by field andnpetrographic evidence to post M1 and pre M2.n This thesis highlights several problems in using trace elements geochemistry to determine thentectonic environment of ancient igneous rocks. Because the arc-type signature of the ~ 1800 Mansubalkaline magmatism was inherited from a ~ 2500 Ma metasomatised mantle source, it cannot beninferred that eruption occurred in a volcanic arc setting. Using tectonic discrimination diagrams isnalso problematic because they are based on analyses of present day volcanic rocks, but thenconcentration of elements in the mantle has changed over time as a result of crustal growth. Th, Hfnand Ta are the basis of a commonly used tectonic discrimmation diagram (Wood, 1980). Massnbalance calculations show that Th/Ta, Th/Hf and Ta/Hf in the depleted mantle have changednthrough time (84%, 94% and 64% respectively since 2.5 Ga) as a result of extraction of continentalncrust.n Nevertheless, combined field, petrographic, trace element and isotopic data provide severalnconstraints on the likely tectonic setting of Paleoproterozoic rocks in the Peake and DenisonnRanges. Because high grade metamorphism accompanied by intense compressional deformationnoccurred shortly after volcanism and sedimentation (1718 Ma p 31), it is unlikely that the tectonicnsetting was intracratonic. In order for the metasomatised mantle source of subalkaline magmatismnto have been preserved for ~700 Ma (prior to eruption), magmatism and sedimentation must havenoccurred along the margin of a stable craton rather than in a juvenile ocean-arc setting.nMetasediments in Kingston and Peake and Coppertop Blocks (mature metasandstone, minor pelitenand bimodal volcanic rocks with intercalated carbonate) and in Davenport Block (maturensandstone, calcareous sandstone, dolomitic mudstone, minor ironstone, and metarhyolite) arenuntypical of active continental margins, but could well have been deposited along the cratonicnmargin of a back-arc basin or along a reactivated formerly passive continental margin.n" @default.
• W5243894 created "2016-06-24" @default.
• W5243894 creator A5026112024 @default.
• W5243894 date "2001-01-01" @default.
• W5243894 modified "2023-09-27" @default.
• W5243894 title "Crustal evolution of paleo- to mesoproterozoic rocks in the Peake and Denison Ranges, South Australia" @default.
• W5243894 hasPublicationYear "2001" @default.
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