The composition and structure of the deep crust of the Capricorn Orogen

Alghamdi, Abdulrhman H.; Aitken, Alan; Dentith, Mike

doi:10.1080/08120099.2018.1389769

Cited by 8 publications

(8 citation statements)

References 45 publications

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“…Major crustal structures of the Capricorn Orogen are inferred from magnetotelluric, gravity, and seismic studies (Aitken et al, 2013;Alghamdi et al, 2017;Dentith et al, 2018;Heinson et al, 2011;Reading et al, 2012;Selway et al, 2009). In particular, based on significant differences in reflection character, a deep seismic reflection survey located several major crustal blocks, which are separated by several south dipping fault zones that can be traced to major suture zones on the surface.…”

Section: Tectonic Settingmentioning

confidence: 99%

A Probabilistic Shear Wave Velocity Model of the Crust in the Central West Australian Craton Constrained by Transdimensional Inversion of Ambient Noise Dispersion

Yuan

Bodin

2018

Tectonics

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The Capricorn Orogen in central Western Australia played important roles in initializing and finalizing the West Australian craton. Surface geological mapping and isotopic studies show that the crust has recorded over a billion years of tectonic history spanning from its crustal formation in the Archean to episodes of tectonothermal events during the Proterozoic cratonization processes. The region therefore provides us with an ideal laboratory to characterize the seismic signature associated with tectonic processes. We constructed a crustal shear wave velocity model of the core region of the orogen, the Glenburgh Terrane and its north boundary, by inverting the array group velocity dispersion data measured from a high-density temporary array. A modified Bayesian transdimensional tomography technique, which incorporates a smooth-varying regional reference velocity model and Moho topography, was used to invert for the crustal velocity variations. The inverted velocity model adds great detail to the intracrustal structure and provides complementary seismic velocity information to refine the regional tectonic processes. Distinct patterns in the velocity structure support that the Glenburgh Terrane is an Archean microcontinent and favor the role of Paleoproterozoic subductions/accretions during the assembly of the West Australian Craton.

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Section: Tectonic Settingmentioning

confidence: 99%

A Probabilistic Shear Wave Velocity Model of the Crust in the Central West Australian Craton Constrained by Transdimensional Inversion of Ambient Noise Dispersion

Yuan

Bodin

2018

Tectonics

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“…(b) Density section of Goodwin (). (c) Density cross section of Alghamdi et al (). The thick red lines in parts (b) and (c) show the major density contrasts (>0.15 g/cm 3 ).…”

Section: Previous Geophysical Studies Of the Deep Crustmentioning

confidence: 99%

“…Alghamdi et al () describe a different approach to modeling the same gravity variations and their preferred density cross section is shown in Figure c. An important difference is the way that the seismic interpretation was depth converted.…”

Section: Previous Geophysical Studies Of the Deep Crustmentioning

confidence: 99%

“…Alghamdi et al () assign some significance to the density contrast across the Talga Fault, which is interpreted as an important geological boundary juxtaposing mafic rocks to the north and intermediate‐felsic rocks to the south. Overall, the gravity data are interpreted as supporting the interpretation of the Lyons River Fault as a fundamental structure, but with the addition of another important geological boundary at the Talga Fault.…”

Section: Previous Geophysical Studies Of the Deep Crustmentioning

confidence: 99%

“…The overall conclusion from the modeling was that the interpretation of the Lyons River Fault as the most important geological structure in the study area is consistent with observed variations in gravity. Alghamdi et al (2017) describe a different approach to modeling the same gravity variations and their preferred density cross section is shown in Figure 3c. An important difference is the way that the seismic interpretation was depth converted.…”

Section: Potential Field Datamentioning

confidence: 99%

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Improved Interpretation of Deep Seismic Reflection Data in Areas of Complex Geology Through Integration With Passive Seismic Data Sets

et al. 2018

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The Capricorn Orogen records the Paleoproterozoic amalgamation of the West Australian Craton. 2‐D deep‐seismic reflection data across the Orogen are difficult to interpret due to the complex geology, and fundamental questions remain about the nature of the basement in the northern part of the Orogen. Passive seismic data have been collected along a 250‐km‐long transect across the central part of the Capricorn Orogen. The passive seismic recordings utilized teleseismic arrivals to construct a velocity section using the receiver function common conversion point method and to estimate crustal thickness and Vp/Vs using the H‐k method. A shear velocity cross section was created using ambient noise‐based methods. An integrated interpretation of all the seismic data sets shows that basement in the central Capricorn Orogen comprises a series of distinct terranes. These are recognized based on changes in crustal reflectivity, velocity and Vp/Vs. We interpret these terranes as originating from an island arc caught in the collision between the Glenburgh Terrane and the Pilbara Craton as part of the 2215–2145 Ma Ophthalmia Orogeny. Although passive seismic data do not have the resolution of reflection data, the information gained from the passive data places important constraints on the reflection interpretation and provides complementary information about changes in crustal composition. We propose that passive seismic data represent a cost‐effective complementary geophysical data set that can greatly assist with the interpretation of deep reflection sections in areas of complex geology.

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Lithospheric thinning and dynamic uplift effects during slab window formation, southern Patagonia (45˚-55˚ S)

Ávila

Dávila

2020

Journal of Geodynamics

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The composition and structure of the deep crust of the Capricorn Orogen

Cited by 8 publications

References 45 publications

A Probabilistic Shear Wave Velocity Model of the Crust in the Central West Australian Craton Constrained by Transdimensional Inversion of Ambient Noise Dispersion

A Probabilistic Shear Wave Velocity Model of the Crust in the Central West Australian Craton Constrained by Transdimensional Inversion of Ambient Noise Dispersion

Improved Interpretation of Deep Seismic Reflection Data in Areas of Complex Geology Through Integration With Passive Seismic Data Sets

Lithospheric thinning and dynamic uplift effects during slab window formation, southern Patagonia (45˚-55˚ S)

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