Timing of Proterozoic metamorphism in the southern Curnamona Province: implications for tectonic models and continental reconstructions ∗

Rutherford, Lachlan; Hand, Martin; Barovich, Karin M.

doi:10.1080/08120090600981459

Cited by 32 publications

(22 citation statements)

References 90 publications

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“…(2000) using conventional garnet‐epidote‐wholerock Sm‐Nd dating (1575 ± 26 Ma). Similar timing for retrograde metamorphism in the SCP between 1570 and 1550 Ma has also been documented by Rutherford et al. (2007) using in situ EPMA monazite dating.…”

Section: Resultssupporting

confidence: 78%

“…The latter hypothesis is supported by the broad distribution of 1575–1550 Ma amphibolite facies metamorphic ages recorded elsewhere across both the Olary and Broken Hill domains (Kent et al. , 2000; Rutherford et al. , 2007).…”

Section: Discussionmentioning

confidence: 86%

“…, 2005; Forbes et al. , 2007b; Rutherford et al. , 2007) for peak metamorphism during the Olarian Orogeny (1605–1595 Ma), the origin of the older two populations needs to be explained.…”

Section: Discussionmentioning

confidence: 99%

“…However, of the available geochronological constraints on the evolution of the southern Broken Hill domain, the timing of metamorphism and deformation remains poorly documented despite recent efforts to elucidate metamorphic timeframes (Forbes et al. , 2007b; Rutherford et al. , 2007).…”

Section: Introductionmentioning

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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Section: Resultssupporting

confidence: 78%

Section: Discussionmentioning

confidence: 86%

“…, 2005; Forbes et al. , 2007b; Rutherford et al. , 2007) for peak metamorphism during the Olarian Orogeny (1605–1595 Ma), the origin of the older two populations needs to be explained.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…(2005). However, monazite ages of the Round Hill metapelitic gneisses presented by Rutherford et al. (2007) are 1612±18 and 1601±18 Ma, consistent with a single metamorphic event (M1) at 1610–1600 Ma, there being no evidence of an earlier event.…”

Section: Examples Of Inference Of False Metamorphic Eventsmentioning

confidence: 71%

False metamorphic events inferred from misinterpretation of microstructural evidence and P–T data

Vernon

White

Clarke

2008

Journal Metamorphic Geology

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Geometrical relationships involving inclusions and partial inclusions in metamorphic microstructures can be inadequate for inferring an order of crystallization and hence a metamorphic reaction. Unique spatial and ⁄ or chemical relationships need to be defined for mineral inclusions, in the context of a reference paragenesis, commonly the matrix assemblage. Corona microstructures are reliable indicators of metamorphic reactions, but require considerable care when used to infer reactions or changes in P-T conditions, owing to kinetic problems, as well as to changes in the effective reaction volume during changes across relatively broad P-T stability fields of assemblages. Mineral equilibria models, most commonly implemented through P-T pseudosections, may allow the order in which different minerals become stable along a given P-T path to be inferred. However, the order in which two minerals become stable may be different from the order in which two grains of these minerals nucleate. Furthermore, such diagrams cannot make predictions about which minerals will form porphyroblasts and which minerals will form inclusions in porphyroblasts. An evaluation of three examples from the Australian Proterozoic shows that modelling, in combination with inclusion-host relationships, is a powerful tool for understanding the metamorphic evolution of a rock, but involves considerable uncertainty.

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Structural controls on localized intraplate deformation and seismicity in Southern Australia: Insights from local earthquake tomography of the Flinders Ranges

et al. 2013

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Data from an array of 24 seismometers are used to image the crust beneath the Flinders Ranges, southeast Australia, with the goal of improving our understanding of crustal structure, rheology, and the mechanism responsible for the localized intraplate deformation that characterizes this region. A subset of P‐ and S‐wave traveltimes is inverted to jointly recover earthquake hypocenters, P‐wave velocity structure and vp/vs anomalies. The P‐wave velocity model reveals a spatial correlation between major negative velocity perturbations and concentrations of seismicity. In particular, a cluster of seismicity is observed within a distinct low velocity region between the Archean‐Mesoproterozoic Gawler Craton and the Palaeo‐Mesoproterozoic Curnamona Province, from 7 to 20 km depth. We postulate that this may be associated with a pre‐existing structural weakness in the crust that arises primarily from rifting between the Curnamona Province and the Gawler Craton. Another area characterized by a high level of seismicity overlies a major sequence of N‐S trending Ross‐Delamerian thrust faults, which correspond to a band of low vp and particularly vp/vs. The lack of evidence for elevated heat flows in both of these seismogenic regions suggests that thermally induced weakness is unlikely to play a dominant role. Instead, the dynamic behavior of this intraplate region appears to be caused by a serendipitously oriented regional stress field, provided by far field forces that originate from the boundary between the Pacific and Australian plates, which acts upon preexisting structural weaknesses in the lithosphere.

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Timing of Proterozoic metamorphism in the southern Curnamona Province: implications for tectonic models and continental reconstructions ∗

Cited by 32 publications

References 90 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

False metamorphic events inferred from misinterpretation of microstructural evidence and P–T data

Structural controls on localized intraplate deformation and seismicity in Southern Australia: Insights from local earthquake tomography of the Flinders Ranges

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