Crustal thickening and uplift of the Tibetan Plateau inferred from receiver function analysis

He, Chuansong; Santosh, M.; Dong, Shuwen; Xingchen, Wang

doi:10.1016/j.jseaes.2014.12.011

Cited by 6 publications

(2 citation statements)

References 186 publications

(214 reference statements)

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“…The Vp/Vs value at BA11 (1.65 ± 0.07) is the lowest in the study area which may imply a lower crustal delamination in Bass Strait, leaving a dominantly felsic crust (e.g. He et al, 2015;Bello et al, 2019b).…”

Section: Poisson's Ratio V P /V S and Average Crustal Compositionmentioning

confidence: 79%

“…In terms of Vp/Vs, a more felsic (SiO 2 ) composition in the lower crust is represented by a lower Vp/Vs, which reflects removal of an intermediate-mafic zone by delamination, whereas a more mafic lower crust is depicted by higher Vp/Vs (> 1.75) which may be due to underplated material (Pan and Niu, 2011). However, lower crustal delamination can also result in decompression melting, which can yield elevated Vp/Vs (He et al, 2015). We interpret the variation of observed Poisson's ratios (0.210-0.256) in the southern Tasmanides to be a consequence of compositionally heterogeneous crust and localised partial melt that may likely be sourced from recent intraplate volcanism (Rawlinson et al, 2017).…”

Section: Poisson's Ratio V P /V S and Average Crustal Compositionmentioning

confidence: 99%

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Crustal structure of southeast Australia from teleseismic receiver functions

Bellò¹,

Cornwell²,

Rawlinson³

et al. 2020

Preprint

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Abstract. In an effort to improve our understanding of southeast Australia’s enigmatic tectonic evolution, we analyse teleseismic earthquakes recorded by 24 temporary and 8 permanent broadband stations using the receiver function method. Crustal thickness, bulk seismic velocity and internal crustal structure of the southern Tasmanides – an assemblage of Palaeozoic accretionary orogens that occupy eastern Australia – are constrained by our new results which point to: (1) a 39.0 ± 0.5 km thick crust, a relatively high Poisson’s ratio (0.262 ± 0.014) and a broad (> 10 km) crust-mantle transition beneath the Lachlan Fold Belt. This is interpreted to represent magmatic underplating of mafic materials at the base of the crust; (2) a complex crustal structure beneath VanDieland, a postulated Precambrian continental fragment embedded in the southernmost Tasmanides, where the crust thickens (37.5 ± 1.2 km) towards the northern tip of the microcontinent as it enters south central Victoria but thins south into Bass Strait (30.5 ± 2.1 km), before once again becoming thicker beneath western Tasmania (33.5 ± 1.9 km). The thinner crust beneath Bass Strait can be attributed to lithospheric stretching that resulted from the break-up of Antarctica and Australia and the opening of the Tasman Sea; (3) stations located in the East Tasmania Terrane and eastern Bass Strait (ETT+EB) collectively indicate crust of uniform thickness (∼ 33 km) and a slightly broad Moho transition that reflect a possible underplating event associated with a Palaeozoic subduction system. The relative uniformity of Vp/Vs and Poisson’s ratio in VanDieland – suggesting uniformity in composition – could be used in support of the VanDieland microcontinental model that explains the tectonic evolution of southeast Australia.

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Section: Poisson's Ratio V P /V S and Average Crustal Compositionmentioning

confidence: 79%