The Broken Hill ore body, Australia

Hobbs, B. E.; Ransom, D. M.; Vernon, R. H.; Williams, Peter

doi:10.1007/bf00207523

Cited by 21 publications

(7 citation statements)

References 28 publications

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“…Each sample contains some elements of the three main high‐grade schistosity surfaces previously recognized in the Broken Hill Domain (Hobbs, 1966; Hobbs et al. , 1968; Laing et al.…”

Section: Sample Locations and Descriptionsmentioning

confidence: 99%

“…Each sample contains some elements of the three main high-grade schistosity surfaces previously recognized in the Broken Hill Domain (Hobbs, 1966;Hobbs et al, 1968;Laing et al, 1978;Marjoribanks et al, Skirrow et al, 1999), showing the distribution of the Upper and Lower Willyama Supergroup metasediments. Metamorphic isograds are after Webb & Crooks (2005). 1980; Webb & Crooks, 2005).…”

Section: Sample Locations and Descriptionsmentioning

confidence: 99%

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Constraints on the early metamorphic evolution of Broken Hill, Australia, from in situ U‐Pb dating and REE geochemistry of monazite

McFarlane

Frost

2008

Journal Metamorphic Geology

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The Broken Hill Pb-Zn deposit, New South Wales Australia, is hosted in granulite facies gneisses of the Southern Curnamona Province (SCP) that have long been known to record a polydeformational and polymetamorphic history. The details of this potentially prolonged tectonothermal history have remained poorly understood because of a historical emphasis on conventional (i.e. grain mount) U-Pb zircon geochronology to reveal details of the sedimentary, magmatic and metamorphic history of the rock that crops out in the vicinity of the city of Broken Hill. An alternative approach to unravelling the metamorphic history of the granulite facies gneisses in and around Broken Hill is to date accessory minerals, such as monazite, that participate in sub-solidus metamorphic reactions. We have taken advantage of the high spatial resolution and high sensitivity afforded by SHRIMP monazite geochronology to reconstruct the early history of the metamorphic rocks at Broken Hill. In contrast to previous studies, in situ analysis of monazite grains preserved in their original textural context in polished thin sections is used. Guided by electron microprobe X-ray maps, SHRIMP U-Pb dates for three distinct monazite compositional domains record pulses of monazite growth at c. 1657 Ma, c.1630 Ma and c.1602 Ma. It is demonstrated that these ages correspond to monazite growth during lower amphibolite facies, upper amphibolite facies and granulite facies metamorphism, respectively. It is speculated that this progressive heating of the SCP crust may have been driven by inversion of the upper crust during the Olarian Orogeny that was pre-heated by magmatic underplating at c.1657 Ma.

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“…Each sample contains some elements of the three main high‐grade schistosity surfaces previously recognized in the Broken Hill Domain (Hobbs, 1966; Hobbs et al. , 1968; Laing et al.…”

Section: Sample Locations and Descriptionsmentioning

confidence: 99%

Section: Sample Locations and Descriptionsmentioning

confidence: 99%

Constraints on the early metamorphic evolution of Broken Hill, Australia, from in situ U‐Pb dating and REE geochemistry of monazite

McFarlane

Frost

2008

Journal Metamorphic Geology

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“…Some zones do show faulting and brecciation, but many of the fractures cut and displace the foliation of the retrograde schists, and the minerals of these zones are of very low grade, namely chlorite, clay minerals, * Other retrograde rocks not discussed here are the products of patchy, pseudomorphous retrograde metamorphisms outside the schist zones (see Vernon, 1969;Hobbs et al, 1968).…”

Section: General Structure Of the Retrograde Schist-zonesmentioning

confidence: 97%

“…However, descriptions of brecciation and slickensides suggest that Richards has not distinguished between true retrograde schist-zones (containing sulphide schists) and fault-zones (containing sulphide breccias) in which later fracturing has been operative. The sulphide schists are important in relating metamorphism and emplacement of sulphide rocks at Broken Hill, as discussed by Hobbs et al (1968).…”

Section: Calcareous Rocksmentioning

confidence: 99%

Retrograde Schists of the Amphibolite Facies at broken hill, New South Wales

Vernon

Ransom

1971

Journal of the Geological Society of Australia

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“…In the Broken Hill district of western New South Wales almandine-bearing metapelites are common and widespread throughout the Willyama Complex, which contains metamorphic materials produced by at least two metamorphic episodes (Browne, 1922;Binns, 1962;Hobbs et al, 1968;Vernon & Ransom, 1971). Petrographic and chemical studies have been carried out on the almandine-bearing metapelites produced by the first recognizable (prograde) metamorphic event within the Complex, the Willyama Metamorphism (Binns, 1964).…”

Section: Introductionmentioning

confidence: 98%

Chemical variation of almandine and biotite with progressive regional metamorphism of the Willyama complex, broken hill, New South Wales

Chenhall¹

1976

Journal of the Geological Society of Australia

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The Broken Hill ore body, Australia

Cited by 21 publications

References 28 publications

Constraints on the early metamorphic evolution of Broken Hill, Australia, from in situ U‐Pb dating and REE geochemistry of monazite

Constraints on the early metamorphic evolution of Broken Hill, Australia, from in situ U‐Pb dating and REE geochemistry of monazite

Retrograde Schists of the Amphibolite Facies at broken hill, New South Wales

Chemical variation of almandine and biotite with progressive regional metamorphism of the Willyama complex, broken hill, New South Wales

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