Deep crustal structure of the Musgrave Block, central Australia: Results from teleseismic travel‐time anomalies

Lambeck, Kurt; Burgess, Gregory

doi:10.1080/08120099208727996

Cited by 50 publications

(47 citation statements)

References 12 publications

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“…Modelling of gravity and seismic data suggests that this layer is between 10 and 20 km thick (Goleby et al 1989;Lambeck & Burgess 1992). The heat production is typically <2 mW m À3 in felsic lithologies and c. 1 mW m À3 in mafic rocks (Fig.…”

Section: Heat Production Distributions In the Central Australian Regionmentioning

confidence: 96%

“…The mid-upper crust consists predominantly of Palaeo-to Mesoproterozoic metasedimentary and granitic lithologies. Gravity and seismic data, as well as baric offsets across large shear zones suggest that this mid to upper crustal layer is typically at least 10 km thick (Goleby et al 1988(Goleby et al , 1989Warren & Hensen 1989;Lambeck & Burgess 1992). In much of the Musgrave Inlier, TECTONIC FEEDBACK 201 Fig.…”

Section: Heat Production Distributions In the Central Australian Regionmentioning

confidence: 98%

“…Along the northern margin of the orogen, differential denudation across largescale thrust faults resulted in important structuring of the crust. The major structural feature is the Woodroffe Thrust; a south-dipping mylonite zone up to 3 km thick (Edgoose et al 1993;Camacho et al 1995;Stewart 1995) offsetting the Moho by c. 20 km (Lambeck & Burgess 1992) and associated with a prominent gradient in the gravity field. South of the Woodroffe Thrust, deformation produced an imbricate thrust stack in which levels of denudation decrease northward from c. 40 km to 30 km in the immediate hanging wall of the Woodroffe Thrust (Scrimgeour & Close 1998).…”

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confidence: 99%

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Tectonic feedback, intraplate orogeny and the geochemical structure of the crust: a central Australian perspective

Sandiford

Hand

McLaren

2001

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The geological record of intraplate deformation in central Australia implies that past tectonic activity (basin formation, deformation and erosion) has modulated the response of the lithosphere during subsequent tectonic activity. In particular, there is a correspondence between the localization of deformation during intraplate orogeny and the presence of thick sedimentary successions in the preserved remnants of a formerly widespread intracratonic basin. This behaviour can be understood as a kind of 'tectonic feedback', effected by the longterm thermal and mechanical consequences of changes in the distribution of heat producing elements induced by earlier tectonism. From a geochemical point of view, one of the most dramatic effects of intraplate orogeny in central Australia has been the exposure, in the cores of the orogens, of deep crustal rocks largely depleted in the heat producing elements. The geochemical structuring of the crust associated with the erosion of the heat-producing upper crust resulted in long-term cooling of the deep crust and upper mantle with associated lithospheric strengthening. This is illustrated here by mapping the consequences of deformation and associated tectonic responses onto the h-q c plane, where h is the characteristic length-scale for heat production distribution, and q c is the total crustal heat production.

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Section: Heat Production Distributions In the Central Australian Regionmentioning

confidence: 96%

Section: Heat Production Distributions In the Central Australian Regionmentioning

confidence: 98%

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confidence: 99%

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Tectonic feedback, intraplate orogeny and the geochemical structure of the crust: a central Australian perspective

Sandiford

Hand

McLaren

2001

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“…Ray-tracing through such a medium may be difficult and the inverse problem is likely to be highly non-linear. Lambeck et al (1988) and Lambeck & Burgess (1992) computed teleseismic traveltime residuals for a 2-D model in which constant velocity layers bounded by piecewise linear interfaces were not required to be laterally continuous across the model, thus allowing faults to be defined. Inversion of traveltime residuals was not attempted in either study, however.…”

Section: Including Interfacesmentioning

confidence: 99%

“…The Musgrave Line dataset was previously interpreted by Lambeck & Burgess (1992) and McQueen & Lambeck (1996) using different methods. Lambeck & Burgess (1992) used forward modeling to satisfy the data with structure represented in terms of constant velocity layers with piece-wise linear boundaries.…”

Section: S Nmentioning

confidence: 99%

Seismic Traveltime Tomography of the Crust and Lithosphere

Rawlinson

Sambridge

2003

Advances in Geophysics

197

171

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Geometry of a large‐scale, low‐angle, midcrustal thrust (Woodroffe Thrust, central Australia)

et al. 2017

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The Musgrave Block in central Australia exposes numerous large‐scale mylonitic shear zones developed during the intracontinental Petermann Orogeny around 560–520 Ma. The most prominent structure is the crustal‐scale, over 600 km long, E‐W trending Woodroffe Thrust, which is broadly undulate but generally dips shallowly to moderately to the south and shows an approximately top‐to‐north sense of movement. The estimated metamorphic conditions of mylonitization indicate a regional variation from predominantly midcrustal (circa 520–620°C and 0.8–1.1 GPa) to lower crustal (~650°C and 1.0–1.3 GPa) levels in the direction of thrusting, which is also reflected in the distribution of preserved deformation microstructures. This variation in metamorphic conditions is consistent with a south dipping thrust plane but is only small, implying that a ≥60 km long N‐S segment of the Woodroffe Thrust was originally shallowly dipping at an average estimated angle of ≤6°. The reconstructed geometry suggests that basement‐cored, thick‐skinned, midcrustal thrusts can be very shallowly dipping on a scale of many tens of kilometers in the direction of movement. Such a geometry would require the rocks along the thrust to be weak, but field observations (e.g., large volumes of syntectonic pseudotachylyte) argue for a strong behavior, at least transiently. Localization on a low‐angle, near‐planar structure that crosscuts lithological layers requires a weak precursor, such as a seismic rupture in the middle to lower crust. If this was a single event, the intracontinental earthquake must have been large, with the rupture extending laterally over hundreds of kilometers.

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Deep crustal structure of the Musgrave Block, central Australia: Results from teleseismic travel‐time anomalies

Cited by 50 publications

References 12 publications

Tectonic feedback, intraplate orogeny and the geochemical structure of the crust: a central Australian perspective

Tectonic feedback, intraplate orogeny and the geochemical structure of the crust: a central Australian perspective

Seismic Traveltime Tomography of the Crust and Lithosphere

Geometry of a large‐scale, low‐angle, midcrustal thrust (Woodroffe Thrust, central Australia)

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