Anisotropy in the flexural response of the Indian Shield

Nair, R.R.; Singh, Yudhvir; Trivedi, Deshraj; Kandpal, Suresh Ch.

doi:10.1016/j.tecto.2012.02.006

Cited by 3 publications

(3 citation statements)

References 81 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, directions aligned with significant anisotropy in the topography or gravity data may also be spurious. A conservative global reanalysis of gravity-topography coherence on these terms, which we present in the Supplementary Material, produces only scant evidence for lithospheric flexural anisotropy, in marked contrast to previous results (Rajesh et al, 2003;Stephen et al, 2003;Nair et al, 2011Nair et al, , 2012Zamani et al, 2013). We draw attention particularly to the results reported by Audet and Bürgmann (2011), which we feel are in danger of being over-interpreted.…”

Section: Discussioncontrasting

confidence: 68%

“…First applied to the Australian continent and the Canadian Shield, these methods have since yielded apparent evidence for pervasive mechanical anisotropy worldwide (Rajesh et al, 2003;Stephen et al, 2003;Nair et al, 2011Nair et al, , 2012Zamani et al, 2013). Audet and Bürgmann (2011) made a geologically attractive case for tectonic inheritance being a controlling factor in the deformation behaviour of the lithosphere throughout supercontinent cycles.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

On the robustness of estimates of mechanical anisotropy in the continental lithosphere: A North American case study and global reanalysis

Kalnins

Simons

Kirby

et al. 2015

Earth and Planetary Science Letters

View full text Add to dashboard Cite

Publisher's copyright statement: NOTICE: this is the author's version of a work that was accepted for publication in Earth and Planetary Science Letters. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reected in this document. Changes may have been made to this work since it was submitted for publication. Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractLithospheric strength variations both influence and are influenced by many tectonic processes, including orogenesis and rifting cycles. The long, complex, and highly anisotropic histories of the continental lithosphere might lead to a natural expectation of widespread mechanical anisotropy. Anisotropy in the coherence between topography and gravity anomalies is indeed often observed, but whether it corresponds to an elastic thickness that is anisotropic remains in question. If coherence is used to estimate flexural strength of the lithosphere, the null-hypothesis of elastic isotropy can only be rejected when there is significant anisotropy in both the coherence and the elastic strengths derived from it, and if interference from anisotropy in the data themselves can be plausibly excluded. We consider coherence estimates made using multitaper and wavelet methods, from which estimates of effective elastic thickness are derived. We develop a series of statistical and geophysical tests for anisotropy, and specifically evaluate the potential for spurious results with synthetically generated data. Our primary case study, the North American continent, does not exhibit meaningful anisotropy in its mechanical strength. Similarly, a global reanalysis of continental gravity and topography using multitaper methods produces only scant evidence for lithospheric flexural anisotropy.

show abstract

Section: Discussioncontrasting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

On the robustness of estimates of mechanical anisotropy in the continental lithosphere: A North American case study and global reanalysis

Kalnins

Simons

Kirby

et al. 2015

Earth and Planetary Science Letters

View full text Add to dashboard Cite

show abstract

“…Because of this, there exists the possibility of artificial correlation between T e and f maps because the rollover is strongly dependent upon T e Kirby and Swain, 2008). Maps of the spatial variation of f have mostly been made using wavelet methods (Stark et al, 2003;Swain and Kirby, 2006;Tassara et al, 2007;Jiménez-Díaz et al, 2014), but also by Nair et al (2012) using multitapers.…”

Section: The Load Ratio and The Loadsmentioning

confidence: 99%

Estimation of the effective elastic thickness of the lithosphere using inverse spectral methods: The state of the art

Kirby

2014

Tectonophysics

View full text Add to dashboard Cite

The effective elastic thickness (T e ) is a geometric measure of the flexural rigidity of the lithosphere, which describes the resistance to bending under the application of applied, vertical loads. As such, it is likely that its magnitude has a major role in governing the tectonic evolution of both continental and oceanic plates. Of the several ways to estimate T e , one has gained popularity in the 40 years since its development because it only requires gravity and topography data, both of which are now readily available and provide excellent coverage over the Earth and even the rocky planets and moons of the solar system. This method, the 'inverse spectral method', develops measures of the relationship between observed gravity and topography data in the spatial frequency (wavenumber) domain, namely the admittance and coherence. The observed measures are subsequently inverted against the predictions of thin, elastic plate models, giving estimates of T e and other lithospheric parameters. This article provides a review of inverse spectral methodology and the studies that have used it. It is not, however, concerned with the geological or geodynamic significance or interpretation of T e , nor does it discuss and compare T e results from different methods in different provinces. Since the three main aspects of the subject are thin elastic plate flexure, spectral analysis, and inversion methods, the article broadly follows developments in these. The review also covers synthetic plate modelling, and concludes with a summary of the controversy currently surrounding inverse spectral methods, whether or not the large T e values returned in cratonic regions are artefacts of the method, or genuine observations.

show abstract

Tectonic inheritance of the Indian Shield: New insights from its elastic thickness structure

2014

View full text Add to dashboard Cite

Anisotropy in the flexural response of the Indian Shield

Cited by 3 publications

References 81 publications

On the robustness of estimates of mechanical anisotropy in the continental lithosphere: A North American case study and global reanalysis

On the robustness of estimates of mechanical anisotropy in the continental lithosphere: A North American case study and global reanalysis

Estimation of the effective elastic thickness of the lithosphere using inverse spectral methods: The state of the art

Tectonic inheritance of the Indian Shield: New insights from its elastic thickness structure

Contact Info

Product

Resources

About