Variations of the effective elastic thickness over the Ross Sea and Transantarctic Mountains and implications for their structure and tectonics

Ji, Fei; Gao, Jinyao; Li, Fēi; Shen, Zhongyan; Zhang, Qiao

doi:10.1016/j.tecto.2017.07.011

Cited by 18 publications

(21 citation statements)

References 71 publications

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“…Geochemistry, Geophysics, Geosystems the Transantarctic Mountains front (Ji et al, 2017). The results here thus favor a relatively weak lithosphere in comparison to previous studies and suggest that models based on the total subsidence in the composite moat are biased toward high values.…”

Section: 1029/2019gc008568supporting

confidence: 55%

“…Intermediate values, ranging from 0.4 × 10 21 to 1 × 10 21 N‐m, are obtained from unbroken plate models of the stratigraphic surfaces within the basin and gravity data (Aitken et al, 2012; Chen, 2015; Ji et al, 2017; Ten Brink et al, 1997). The intermediate values are similar to the rigidity estimates of 0.8 × 10 21 to 2.2 × 10 21 N‐m that are obtained in more regional models close to the Transantarctic Mountains front (Ji et al, 2017). The results here thus favor a relatively weak lithosphere in comparison to previous studies and suggest that models based on the total subsidence in the composite moat are biased toward high values.…”

Section: Implications For the Post Middle Miocene Evolution Of The Vlmentioning

confidence: 99%

“…A higher rigidity, 10 23 N-m, is obtained by modeling the bathymetric moat and treating the lithosphere as a semi-infinite (broken) plate with the edge laying beneath Ross Island (Stern et al, 1991). Intermediate values, ranging from 0.4 × 10 21 to 1 × 10 21 N-m, are obtained from unbroken plate models of the stratigraphic surfaces within the basin and gravity data (Aitken et al, 2012;Chen, 2015;Ji et al, 2017;Ten Brink et al, 1997). The intermediate values are similar to the rigidity estimates of 0.8 × 10 21 to 2.2 × 10 21 N-m that are obtained in more regional models close to 1.2 a Flexural rigidity calculated for a point load on an unbroken elastic plate according to D = α 4 Δρg, where g is 9.8 m s −2 , Δρ = 0.5 × 10 3 kg m −3 is the assumed density contrast between the mantle and basin fill, and α ≈ X 0 /4 is the flexural parameter (Lambeck & Nakiboglu, 1980).…”

Section: Flexure and Strength Of The Lithospherementioning

confidence: 99%

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Post Middle Miocene Tectonomagmatic and Stratigraphic Evolution of the Victoria Land Basin, West Antarctica

Wenman

Harry

Jha

2020

Geochem Geophys Geosyst

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Seismic reflection and borehole data are used to create structure maps of four regional and three local unconformities that constrain the post middle Miocene evolution of the Victoria Land Basin (VLB), which is located in the western Ross Sea within the Late Cretaceous through Quaternary West Antarctic Rift System. Isochore maps of the strata between unconformities show that rifting was mostly amagmatic between 12 to 7.6 Ma, with subsidence controlled by faults bordering the northwest margin of the basin and in a tectonic zone along the southern basin axis known as the Terror Rift. Depocenters surrounding volcanic features in strata younger than 4.3 Ma indicate an increasing influence of flexure due to volcanic loading on the subsidence pattern in the southern VLB after this time. The intervening period, from 7.6 to 4.3 Ma, was a transitional period during which both extensional tectonism and magmatism exerted strong influences on basin morphology. Since 4.3 Ma, a series of flexural subbasins formed successively at different times and positions as the different volcanic centers that built Ross Island erupted. In composite, these subbasins form a flexural moat surrounding Ross Island and smaller volcanic centers immediately to the north. The widths of these basins indicate that the flexural rigidity of the lithosphere ranges from 0.20 × 1019 to 12.96 × 1019 N‐m (elastic thickness 0.6 to 2.4 km).

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Section: 1029/2019gc008568supporting

confidence: 55%

Section: Implications For the Post Middle Miocene Evolution Of The Vlmentioning

confidence: 99%

Section: Flexure and Strength Of The Lithospherementioning

confidence: 99%

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Post Middle Miocene Tectonomagmatic and Stratigraphic Evolution of the Victoria Land Basin, West Antarctica

Wenman

Harry

Jha

2020

Geochem Geophys Geosyst

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“…Forward and inverse (spectral) modeling suggests that T e increases from 5 km at the front of the TAM to high values in interior East Antarctica (Chen et al, ; Ji et al, ; ten Brink et al, ). However, the exact value of this high T e varies between different methods.…”

Section: Methodsmentioning

confidence: 99%

“…However, this estimate was determined using a single 2‐D model across the southern TAM and WSB (Figure ) and does not account for any lateral variation along the mountain range or basin. Inverse spectral methods (gravitational admittance and coherence) indicate that T e increases from ~30 to ~60 km westward across the WSB (Chen et al, ; Ji et al, ).…”

Section: Methodsmentioning

confidence: 99%

The Role of Lithospheric Flexure in the Landscape Evolution of the Wilkes Subglacial Basin and Transantarctic Mountains, East Antarctica

et al. 2019

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Reconstructions of the bedrock topography of Antarctica since the Eocene‐Oligocene Boundary (approximately 34 Ma) provide important constraints for modeling Antarctic ice sheet evolution. This is particularly important in regions where the bedrock lies below sea level, since in these sectors the overlying ice sheet is thought to be most susceptible to past and future change. Here we use 3‐D flexural modeling to reconstruct the evolution of the topography of the Wilkes Subglacial Basin (WSB) and Transantarctic Mountains (TAM) in East Antarctica. We estimate the spatial distribution of glacial erosion beneath the East Antarctic Ice Sheet, and restore this material to the topography, which is also adjusted for associated flexural isostatic responses. We independently constrain our post‐34 Ma erosion estimates using offshore sediment stratigraphy interpretations. Our reconstructions provide a better‐defined topographic boundary condition for modeling early East Antarctic Ice Sheet history. We show that the majority of glacial erosion and landscape evolution occurred prior to 14 Ma, which we interpret to reflect more dynamic and erosive early ice sheet behavior. In addition, we use closely spaced 2‐D flexural models to test previously proposed hypotheses for a flexural origin of the TAM and WSB. The pre‐34 Ma topography shows lateral variations along the length of the TAM and WSB that cannot be explained by uniform flexure along the front of the TAM. We show that some of these variations may be explained by additional flexural uplift along the south‐western flank of the WSB and the Rennick Graben in northern Victoria Land.

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Tectonic control on effective elastic thickness over the Northeast Indian Seamount Province and surrounding regions

Afelumo

Akinrinade

2021

Mar Geophys Res

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Variations of the effective elastic thickness over the Ross Sea and Transantarctic Mountains and implications for their structure and tectonics

Cited by 18 publications

References 71 publications

Post Middle Miocene Tectonomagmatic and Stratigraphic Evolution of the Victoria Land Basin, West Antarctica

Post Middle Miocene Tectonomagmatic and Stratigraphic Evolution of the Victoria Land Basin, West Antarctica

The Role of Lithospheric Flexure in the Landscape Evolution of the Wilkes Subglacial Basin and Transantarctic Mountains, East Antarctica

Tectonic control on effective elastic thickness over the Northeast Indian Seamount Province and surrounding regions

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