Effective elastic thickness of Zealandia and its implications for lithospheric deformation

Ji, Fei; Zhang, Qiao; Zhou, Xiwen; Bai, Yongliang

doi:10.1016/j.gr.2020.05.008

Cited by 10 publications

(10 citation statements)

References 96 publications

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“…Sediments may play an important role in T e estimation using spectral methods due to the significant density contrast with the underlying basement, which is not considered a priori (e.g., Chen et al., 2015; Ji et al., 2020; Kaban et al., 2018; Kirby, 2022; Ratheesh‐Kumar et al., 2015; Shi et al., 2017; Yu et al., 2022). Large amount of sediments cause a flattening of the bathymetry and a prominent negative gravity anomaly, modifying the relationship between surface topography and gravity anomalies.…”

Section: Methods and Datamentioning

confidence: 99%

The Mechanical Nature of the Lithosphere Beneath the Eastern Central Atlantic Hotspots

Jiménez‐Díaz

Negredo

Kirby

et al. 2023

Geochem Geophys Geosyst

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The Eastern Central Atlantic (ECA) is characterized by the presence of a number of volcanic archipelagos, seamounts and plateaux, which are rooted in a crust ranging in age from 0 Ma at the Mid-Atlantic Ridge (MAR) to 180 Ma at the north-western African margin. The ECA includes five hotspots, namely, the Azores, Madeira, the Canary and Cape Verde archipelagos (often collectively termed as Macaronesia region), and the Great Meteor Seamount hotspot (Figure 1) that exhibit contrasting morphologic, geologic, and geophysical characteristics.

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Section: Methods and Datamentioning

confidence: 99%

The Mechanical Nature of the Lithosphere Beneath the Eastern Central Atlantic Hotspots

Jiménez‐Díaz

Negredo

Kirby

et al. 2023

Geochem Geophys Geosyst

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“…The equivalent topography, T e and Moho topography, are required to estimate lithospheric flexure. The equivalent topography can be specifically calculated using a global elevation model, sediment thickness model and sediment thickness-density conversion formula (e.g., Sclater & Christie 1980;Ji et al 2020), such that this random fractal initial load (h i ) and flexure (v) derived 212 topography (h) can be used in the synthetic modelling. The influences of both the recovered T e 213 errors and inverted Moho errors on the FD-derived lithospheric flexure are investigated to 214 determine how these inputs shape the model results.…”

Section: Synthetic Modellingmentioning

confidence: 99%

“…This assumption allows the lithosphere to be modelled as the flexure of a thin, elastic plate via the partial differential equation for the flexure of an orthotropic plate (Timoshenko & Woinowsky-Krieger 1959). This equation is usually used indirectly to calculate theoretical admittance and coherence, which are then compared against observed ones to invert for the non-uniform flexural rigidity (or effective elastic thickness, T e ) of the plate (Kirby (Pérez-Gussinyé et al 2009;Chen et al 2015;Ji et al 2017Ji et al , 2020Lu et al 2020). However, this idealised term does not refer to an existing thickness or physical layer within the Earth, but instead corresponds to the thickness of an ideal elastic plate that undergoes the same deformation as the lithosphere under the same loads (Watts 2001).…”

Section: Introductionmentioning

confidence: 99%

Estimating the Lithospheric Flexure of a Plate with Non-uniform Flexural Rigidity: A Quantitative Modelling Approach

Ji³

et al. 2021

Preprint

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Lithospheric deformation is a fundamental process in plate tectonics. It is therefore critical to determine how the lithosphere responds to geological loads to better understand tectonic processes. The lithosphere can be modelled as the flexure of a thin, elastic plate over long-term (>10 5 yr) geological timescales. The partial differential equation for the flexure of an orthotropic plate is used indirectly to calculate theoretical admittance and coherence, which are then compared against the observed admittance and coherence to invert for the non-uniform flexural rigidity (or effective elastic thickness, T e ) of the plate. However, the process for accurately recovering variable lithospheric flexure remains unresolved, as the classical lithospheric model may overestimate the deflection of the plate. Here we adopt the classic lithospheric model with applied external and internal loads at the surface and Moho, respectively, and assume that the compensation material is denser than the mantle material beneath the Moho. The lithospheric flexure errors are derived mainly from the T e and Moho recovery errors in this lithospheric model. Synthetic modelling is then performed to analyse the influence of the T e and Moho errors. The analysis of synthetic modelling shows that: 1) the inverted flexure values are insensitive to the T e errors, and the T e error-induced flexure errors exhibit a rippling pattern; 2) the Moho error-induced flexure errors occur mainly in the low T e regions, and the Moho disturbance is alleviated by both an attenuation coefficient of the form and the lithospheric strength as the Moho disturbance propagates into the lithospheric flexure error; and 3) the lithospheric flexure errors are dominated by the T e and Moho errors in the high and low T e regions, respectively.

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“…1/2 , (e.g., Sclater & Christie 1980;Ji et al 2020), such that this random fractal initial load (h i ) and flexure (v) derived topography (h) can be used in the synthetic modelling. The influences of both the recovered T e errors and inverted Moho errors on the FD-derived lithospheric flexure are investigated to determine how these inputs shape the model results.…”

Section: Synthetic Modellingmentioning

confidence: 99%

“…This equation is usually used indirectly to calculate theoretical admittance and coherence, which are then compared against observed ones to invert for the non-uniform flexural rigidity (or effective elastic thickness, T e ) of the plate (Kirby 2014). Numerous studies have used T e to analyse lithospheric rheology and deformation (Pérez-Gussinyé et al 2009;Chen et al 2015;Ji et al 2017Ji et al , 2020Lu et al 2020). However, this idealised term does not refer to an existing thickness or physical layer within the Earth, but instead corresponds to the thickness of an ideal elastic plate that undergoes the same deformation as the lithosphere under the same loads (Watts 2001).…”

Section: Introductionmentioning

confidence: 99%

Estimating the lithospheric flexure of a plate with non-uniform flexural rigidity: a quantitative modelling approach

et al. 2021

Earth Planets Space

Self Cite

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Lithospheric deformation is a fundamental process in plate tectonics. It is, therefore, critical to determine how the lithosphere responds to geological loads to better understand tectonic processes. The lithosphere can be modelled as the flexure of a thin, elastic plate over long-term (> 105 yr) geological timescales. The partial differential equation for the flexure of an orthotropic plate is used indirectly to calculate theoretical admittance and coherence, which are then compared against the observed admittance and coherence to invert for the non-uniform flexural rigidity (or effective elastic thickness, Te) of the plate. However, the process for accurately recovering variable lithospheric flexure remains unresolved, as the classical lithospheric model may overestimate the deflection of the plate. Here we adopt the classic lithospheric model with applied external and internal loads at the surface and Moho, respectively, and assume that the compensation material is denser than the mantle material beneath the Moho. The lithospheric flexure errors are derived mainly from the Te and Moho recovery errors in this lithospheric model. Synthetic modelling is then performed to analyse the influence of the Te and Moho errors. The analysis of synthetic modelling shows that: (1) the Te error-induced flexure errors exhibit a rippling pattern, and the rippling pattern is broader in high Te regions; (2) the Moho error-induced flexure errors mainly occur in the low Te regions, and applying Airy isostasy theory in low Te regions may still greatly overestimate the lithospheric deformation amplitude; and (3) the lithospheric flexure errors are dominated by the Te and Moho errors in the high and low Te regions, respectively.

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Effective elastic thickness of Zealandia and its implications for lithospheric deformation

Cited by 10 publications

References 96 publications

The Mechanical Nature of the Lithosphere Beneath the Eastern Central Atlantic Hotspots

The Mechanical Nature of the Lithosphere Beneath the Eastern Central Atlantic Hotspots

Estimating the Lithospheric Flexure of a Plate with Non-uniform Flexural Rigidity: A Quantitative Modelling Approach

Estimating the lithospheric flexure of a plate with non-uniform flexural rigidity: a quantitative modelling approach

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