Reprint of: Flexural controls on late Neogene basin evolution in southern McMurdo Sound, Antarctica

Aitken, Alan; Wilson, Gary; Jordan, Tom A.; Tinto, Kirsty; Blakemore, Hamish

doi:10.1016/j.gloplacha.2012.02.004

Cited by 1 publication

(3 citation statements)

References 59 publications

(112 reference statements)

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“…The density and temperature anomalies associated with the narrow (100 km wide) plume model are similar in magnitude to those obtained by Haeger et al (2019) Although the magnitude of the density and thermal anomalies beneath Ross Island obtained from the flexural models are reasonably consistent with seismic estimates, conversion to absolute temperature is problematic. The best-fitting flexural models (Figures 7 and 8) imply a regional asthenosphere density beneath the southern VLB of 3,260 kg m −3 , in agreement with the models of Aitken et al (2012) and approximately 40 kg m −3 lower than the global average. If the density difference is attributed entirely to heat, the corresponding temperature difference is…”

Section: Load Partitioning Between Surface and Sub-surfacesupporting

confidence: 76%

“…do not consider HPP as a separate load. The rigidity estimates obtained in this paper (6-36 × 10 18 N-m) are an order of magnitude lower than the values obtained byAitken et al (2012), which vary from 6 × 10 19 N-m to 9 × 10 20 N-m. Chen (2015) modeled time progressive loading in the Bird and Erebus sub-basins. Using the slopes of seismically mapped reflectors in the basin fill, they obtained elastic thicknesses of 4-5 km (corresponding to flexural rigidities of 5 × 10 20…”

contrasting

confidence: 78%

“…Aitken et al (2012) andChen (2015) modeled the area around Ross Island using unbroken plate models Aitken et al (2012). considered time progressive loading of the lithosphere in the southern McMurdo Sound, with loads initiating at Minna Bluffs followed by Mt.…”

mentioning

confidence: 99%

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Flexural Subsidence Around Ross Island, West Antarctica

Jha

Harry

Wenman

et al. 2022

Geochem Geophys Geosyst

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Ross Island is located in the southern Victoria Land Basin along the western margin of the West Antarctic Rift System. Episodic volcanism since ca. 4.6 Ma produced a discontinuous sedimentary moat around the island, coeval with regional extension. The moat is a composite of four smaller sub‐basins created during distinct episodes of volcanism. Subsidence within each sub‐basin is modeled as bending of a continuous elastic plate, first considering subsidence that occurred only during the time in which the associated volcano was active, and then considering cumulative subsidence since the onset of volcanism on Ross Island. Models based on strata deposited in each sub‐basin during the time interval in which the respective volcano was active yield flexural rigidities ranging from 6–36 × 1018 N‐m, with the lowest values associated with the youngest volcanoes on the south and southwest sides of the island. Models based on the entire stratigraphic interval deposited since the onset of volcanism yield flexural rigidities up to 20 times greater than models that consider only strata deposited within each sub‐basin when the associated volcano was active. Models of the composite basin overestimate the strength of the lithosphere due to inclusion of strata deposited during periods in which regional extension rather than local flexure dominated subsidence. The models indicate that Ross Island is in near flexural isostatic equilibrium with moderately low‐density (3,260 kg m−3) upper mantle, although an additional buoyant load equivalent to a mantle temperature anomaly of up to 200°C is permissible.

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Section: Load Partitioning Between Surface and Sub-surfacesupporting

confidence: 76%

contrasting

confidence: 78%