Tectonothermal implications of laser40Ar/39Ar ages of sulphide-bearing veins and their host rocks in the Willyama Supergroup, South Australia

Bierlein, Frank P; Foster, David A.; Plimer, I. R.

doi:10.1007/bf01165760

Cited by 4 publications

(4 citation statements)

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“…The Olary Block is separated from the contiguous Broken Hill Block by an alluvium-covered NNE-trending fault. In the past 5 to 10 years, there has been significant new research on the Olary Block, which was not well known compared to the Broken Hill Block (Berry et al, 1978;Clarke et al, 1986Clarke et al, , 1987Cook and Ashley, 1992;Flint and Parker, 1993;Cook et al, 1994;Ashley et al, 1994Ashley et al, , 1995Bierlein et al, 1995Bierlein et al, , 1996aBierlein et al, , 1996b. This contribution interprets the post-high-grade metamorphic history of the Olary Block.…”

Section: Introductionmentioning

confidence: 80%

“…The overlying Adelaidean sequence underwent at least two stages of penetrative deformation under greenschist-facies metamorphic conditions at 500 + 20 Ma (Delamerian Orogeny-DD1, DD2) (Flint and Parker, 1993). During DDl and DD2, the retrograde schist zones were multiply reactivated (Clarke et al, 1986;Bierlein et al, 1996a). A 40 Ar/ 39 Ar study of muscovite associ ated with epigenetic mineralization has shown that there was widespread precipitation of sul fides during retrograde schist-zone reactivation associated with the Delamerian Orogeny (Bierlein et al, 1996a) …”

Section: Structure and Metamorphismmentioning

confidence: 97%

“…1) and to retrograde schist zones. These schist zones were restricted to Paleoproterozoic to Ordovician time (Bierlein et al, 1996a). Defor mation during the Delamerian Orogeny over printed schist zones over a large area of Willyama Supergroup rocks in the Olary Block (Bierlein et al, 1996b).…”

Section: This Studymentioning

confidence: 99%

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Multiple Post-Orogenic Reactivation in the Olary Block, South Australia: Evidence from ⁴⁰Ar/³⁹Ar Dating of Pegmatitic Muscovite

Plimer

Foster

et al. 1996

International Geology Review

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Metasediments and meta-igneous rocks of the Willyama Supergroup in the Paleoproterozoic Olary Block of South Australia were deposited at ~1700 Ma. Intrusion by I-type granitoids at 1630 Ma was followed by the Olarian Orogeny, comprising two events of deformation and highgrade metamorphism at 1590 ± 20 Ma. Regional S-type granites and rare-metal pegmatites also formed during the Olarian Orogeny. The K-Ar isotopic system in primary pegmatitic muscovite closed at ~1505 ± 7 Ma, and the third event (regressive) of deformation and metamorphism together with minor granite emplacement, associated with the Olarian Orogeny, occurred at 1500 ± 20 Ma. A widespread thermal event occurred at 1100 to 1200 Ma and resulted from the Musgravian Orogeny. This was followed by crustal extension, tholeiitic dolerite dike intrusion, and rifting at 700 to 800 Ma. Cooling after the Delamerian Orogeny is recorded at ~466 to 475 Ma in the muscovite data. The 40 Ar/ 39 Ar data from many mica samples are complex because of multiple phases of thermal resetting and regression. This partial resetting of the K-Ar system is characterized by multiple age components and mixtures between them.

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Section: Introductionmentioning

confidence: 80%

Section: Structure and Metamorphismmentioning

confidence: 97%

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Multiple Post-Orogenic Reactivation in the Olary Block, South Australia: Evidence from ⁴⁰Ar/³⁹Ar Dating of Pegmatitic Muscovite

Plimer

Foster

et al. 1996

International Geology Review

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“…Notable examples are the Copper Blow deposit near Broken Hill (Burton, 1994) and the recently discovered North Portia prospect (Teale and Fanning, 2000). 40 Ar/ 39 Ar geochronology in the Curnamona Province has revealed a protracted thermal history and it has been suggested that much of the epigenetic mineralization in the region occurred during the Early Palaeozoic Delamarian Orogeny (Harrison and McDougall, 1981;Bierlein et al, 1996). However, nine new Re-Os ages from the Kalkaroo, White Dam, Waukaloo and North Portia areas are in the range 1632 Ma to 1612 Ma while SHRIMP dating of monazite associated with Cu-Au parageneses at North Portia gave an age of ca.…”

Section: Ore Deposit Geologymentioning

confidence: 94%

Australian Proterozoic Iron Oxide-Cu-Au Deposits: An Overview with New Metallogenic and Exploration Data from the Cloncurry District, Northwest Queensland

Williams

Pollard

2001

Exploration and Mining Geology

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Enigmatic hydrothermal vein/breccia/replacement Cu-Au deposits with magnetite and/or hematite are well-represented in Australian 1850 Ma to 1500 Ma terrains and associated with different-aged synorogenic intrusions in the Tennant Creek Block (ca. 1850 Ma); the Gawler-Curnamona region (1640 Ma to 1590 Ma); and the Cloncurry district (Mount Isa Eastern Fold Belt, 1540 Ma to 1500 Ma with a possible earlier event at ca. 1600 Ma). No deposits are known to be coeval with various 1780 Ma to 1610 Ma anorogenic intrusions. Deposits are hosted by many different rock-types with varying metamorphic grade including granites and various supracrustal rocks. Depth of mineralization varied from many kilometers in semiductile crust (e.g., Cloncurry deposits) to very shallow (e.g., Olympic Dam). Ore deposition near Cloncurry occurred in brittle-ductile shear zones from geochemically variable and complex, CO2-rich, 300°C to 500°C, high salinity fluids with magmatic stable isotopic signatures. Recently published studies of a giant granitoid-hosted magnetite vein complex at the Lightning Creek prospect (>1000 Mt magnetite) suggest it is a product of internal differentiation and endogenous Fe and Cu-rich hydrous-carbonic fluid phase generation within a quartz monzodiorite-monzogranite intrusion. Coupled with other field relationships, this points to a possible genetic relationship with intermediate (55 to 65 wt% SiO2) members of an alkaline and partly shoshonitic granitoid supersuite which appears to have both mantle and crustal source components from εNd evidence. In constrast, main-phase mineralization at Olympic Dam in the Gawler Craton is distinguished by hematite-phyllosilicate alteration and chalcopyrite-bornite-chalcocite zoning, reflecting fluid mixing in a high level (<250°C) system with a probable large component of meteoric water. Early high-temperature parageneses and fluid inclusions imply that the extensive hematitic breccias overprinted an older magnetite system which may have had similarities with those at Lightning Creek and Ernest Henry in the Cloncurry district.Deposits of this family are inherently difficult to find and evaluate as even within a single district, there is no reliable relationship between the location of ore and any specific combination of geophysical characteristics. Diverse alteration assemblages, geochemistry and physical characteristics suggest the deposits reflect the interaction of multi-sourced fluids with different host rocks in a wide range of geological environments. Recent discoveries and research in the Cloncurry district have extended the range of deposit models available and aid the development of a rudimentary classification in which economic and exploration characteristics can be linked to variations in the mechanisms and environments of ore formation.

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Genetic implications of pyrite chemistry from the Palaeoproterozoic Olary Domain and overlying Neoproterozoic Adelaidean sequences, northeastern South Australia

Clark

Grguric²,

Mumm

2004

Ore Geology Reviews

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Tectonothermal implications of laser40Ar/39Ar ages of sulphide-bearing veins and their host rocks in the Willyama Supergroup, South Australia

Cited by 4 publications

References 22 publications

Multiple Post-Orogenic Reactivation in the Olary Block, South Australia: Evidence from ⁴⁰Ar/³⁹Ar Dating of Pegmatitic Muscovite

Multiple Post-Orogenic Reactivation in the Olary Block, South Australia: Evidence from ⁴⁰Ar/³⁹Ar Dating of Pegmatitic Muscovite

Australian Proterozoic Iron Oxide-Cu-Au Deposits: An Overview with New Metallogenic and Exploration Data from the Cloncurry District, Northwest Queensland

Genetic implications of pyrite chemistry from the Palaeoproterozoic Olary Domain and overlying Neoproterozoic Adelaidean sequences, northeastern South Australia

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Tectonothermal implications of laser40Ar/39Ar ages of sulphide-bearing veins and their host rocks in the Willyama Supergroup, South Australia

Cited by 4 publications

References 22 publications

Multiple Post-Orogenic Reactivation in the Olary Block, South Australia: Evidence from 40Ar/39Ar Dating of Pegmatitic Muscovite

Multiple Post-Orogenic Reactivation in the Olary Block, South Australia: Evidence from 40Ar/39Ar Dating of Pegmatitic Muscovite

Australian Proterozoic Iron Oxide-Cu-Au Deposits: An Overview with New Metallogenic and Exploration Data from the Cloncurry District, Northwest Queensland

Genetic implications of pyrite chemistry from the Palaeoproterozoic Olary Domain and overlying Neoproterozoic Adelaidean sequences, northeastern South Australia

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Multiple Post-Orogenic Reactivation in the Olary Block, South Australia: Evidence from ⁴⁰Ar/³⁹Ar Dating of Pegmatitic Muscovite

Multiple Post-Orogenic Reactivation in the Olary Block, South Australia: Evidence from ⁴⁰Ar/³⁹Ar Dating of Pegmatitic Muscovite