Mantle transition zone beneath central-eastern Greenland: Possible evidence for a deep tectosphere from receiver functions

Kraft, Helene Anja; Vinnik, Lev; Thybo, Hans

doi:10.1016/j.tecto.2018.02.008

Cited by 14 publications

(13 citation statements)

References 31 publications

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“…A similar conclusion is obtained for Greenland by Kraft et al (2018). Arrival times of P660s and P410s modeconverted phases in P receiver functions (PRFs) were measured at 24 seismograph stations in central-eastern Greenland.…”

Section: Introductionsupporting

confidence: 73%

Permian plume beneath Tarim from receiver functions

et al. 2018

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Abstract. Receiver functions for the central Tien Shan and northern Tarim in central Asia reveal a pronounced depression on the 410 km discontinuity beneath the Permian basalts in Tarim. The depression may be caused by elevated temperature. The striking spatial correlation between the anomaly of the MTZ and the Permian basalts suggests that both may be effects of the same plume. This relation can be reconciled with the possible motion of Tarim on the order of 1000 km by assuming that the mantle layer, which has moved coherently with the plate since the Permian, extends to a depth of 410 km or more. Alternatively, the lithosphere and underlying mantle are decoupled at a depth of ∼ 200 km, but a cumulative effect of the Tarim plate motion since the Permian is less by an order of magnitude. A similar explanation is applicable to the Siberian traps.

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Section: Introductionsupporting

confidence: 73%

Permian plume beneath Tarim from receiver functions

et al. 2018

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“…The anomalies of the MTZ might preserve their position beneath the Siberian LIP in spite of the plate motion if they translated coherently with the Siberian plate. A similar conclusion is obtained for Greenland by Kraft et al (2018). Arrival times of P660s and P410s mode converted phases in P receiver functions (PRFs) were measured at 24 45 seismograph stations in central-eastern Greenland.…”

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confidence: 72%

Permian plume beneath Tarim from receiver functions

Vinnik¹,

Deng²,

Kosarev³

et al. 2018

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“…The signal was explained as being generated at the top of a low‐velocity layer in the transition zone at a depth between 465 and 510 km. The reduction of the S wave velocity within this layer has been ascribed to an elevated temperature and reduced solidus temperature of mantle rocks (Kraft et al, , and references therein). Vinnik and Farra () attribute this velocity reduction to enhanced water content of wadsleite.…”

Section: Discussionmentioning

confidence: 99%

“…A discontinuity at 520-km depth was first detected in some areas with SS precursors (e.g., Shearer, 1990) and with Pds phases (Chevrot et al, 1999), and explained as due to the β-spinel to γ-spinel phase transformation. The 520-km discontinuity has been also observed in hot spot regions and explained as the base of a lowvelocity layer in the mantle transition zone (Kraft et al, 2018;Vinnik et al, 2004;Vinnik et al, 2005;Vinnik et al, 2012) associated to melting in presence of high temperatures (Vinnik & Farra, 2006). Finally, a discontinuity at 630-km depth, associated to a seismic velocity reduction, was observed in several regions and interpreted as due to subducted oceanic crust above the 660-km discontinuity (e.g., Shen & Blum, 2003).…”

Section: Introductionmentioning

confidence: 88%

Mantle Structure in the Central Mediterranean Region From P and S Receiver Functions

Monna

Montuori

Piromallo

et al. 2019

Geochem Geophys Geosyst

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We investigate the upper mantle discontinuities in the central Mediterranean region by applying the P and S receiver function techniques on waveforms recorded at broadband stations located around the Tyrrhenian basin. P and S wave velocity profiles (down to 300‐km depth) are calculated with joint inversion of P and S receiver functions. We could identify the Moho, lithosphere‐asthenosphere boundary, and an underlying low‐velocity layer between ~60‐ and ~200‐km depth. The low‐velocity layer is interpreted as asthenospheric material, and its lower boundary is identified below the western Ionian and Tyrrhenian basins as a sharp Lehmann discontinuity. Although the stations are located on different lithospheric domains we find a strong correlation between Moho and the lithosphere‐asthenosphere boundary depths, which suggests ubiquitous coupling of the crust and lithospheric mantle, consistently with the southward opening of the Tyrrhenian basin. The Tyrrhenian and western Ionian basins present thinning of the transition zone of ~14 km, as inferred from a reduced P660s‐P410s differential time. Below the southern Apennines we observe a standard differential time that implies an average mantle transition zone thickness. We explain these mantle transition zone thickness variations as due to temperature heterogeneity linked to the area's subduction history. Finally, under central Europe (the location of the deep S‐to‐P conversion points) two strong signals from nonstandard discontinuities within the mantle transition zone are observed. These signals can be explained as being generated at the boundaries of high seismic velocity layers that are spatially correlated with stagnant slabs in the transition zone detected by seismic tomography.

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Mantle transition zone beneath central-eastern Greenland: Possible evidence for a deep tectosphere from receiver functions

Cited by 14 publications

References 31 publications

Permian plume beneath Tarim from receiver functions

Permian plume beneath Tarim from receiver functions

Permian plume beneath Tarim from receiver functions

Mantle Structure in the Central Mediterranean Region From P and S Receiver Functions

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