Effects of rheology and mantle temperature structure on edge-driven convection: Implications for partial melting and dynamic topography

Kim, Dae–Hee; So, Byung‐Dal

doi:10.1016/j.pepi.2020.106487

Cited by 10 publications

(5 citation statements)

References 37 publications

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“…As plate speed increases, local convection cells that develop at marked changes in lithospheric thickness are conceivably enhanced (Conrad et al., 2010; Davies & Rawlinson, 2014; Rawlinson et al., 2017). These putative cells could destabilize overlying lithospheric mantle and could also contribute hundreds of meters of dynamic support at wavelengths of order 10 2 –10 3 km, as a consequence of normal stresses imparted by shallow mantle flow (Colli et al., 2016; Kim & So, 2020). Return convective flow could also generate observed subsidence of the Coral and Tasman seas.…”

Section: Evolution Of the Eastern Highlandsmentioning

confidence: 99%

Thermal Structure of Eastern Australia's Upper Mantle and Its Relationship to Cenozoic Volcanic Activity and Dynamic Topography

Ball

Czarnota

White

et al. 2021

Geochem Geophys Geosyst

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Spatio‐temporal changes of upper mantle structure play a significant role in generating and maintaining surface topography. Although geophysical models of upper mantle structure have become increasingly refined, there is a paucity of geologic constraints with respect to its present‐day state and temporal evolution. Cenozoic intraplate volcanic rocks that crop out across eastern Australia provide a significant opportunity to quantify mantle conditions at the time of emplacement and to independently validate geophysical estimates. This volcanic activity is divided into two categories: age‐progressive provinces that are generated by the sub‐plate passage of mantle plumes and age‐independent provinces that could be generated by convective upwelling at lithospheric steps. In this study, we acquired and analyzed 78 samples from both types of provinces across Queensland. These samples were incorporated into a comprehensive database of Australian Cenozoic volcanism assembled from legacy analyses. We use geochemical modeling techniques to estimate mantle temperature and lithospheric thickness beneath each province. Our results suggest that melting occurred at depths ≤80 km across eastern Australia. Prior to, or coincident with, onset of volcanism, lithospheric thinning as well as dynamic support from shallow convective processes could have triggered uplift of the Eastern Highlands. Mantle temperatures are inferred to be ∼50–100°C hotter beneath age‐progressive provinces that demarcate passage of the Cosgrove mantle plume than beneath age‐independent provinces. Even though this plume initiated as one of the hottest recorded during Cenozoic times, it appears to have thermally waned with time. These results are consistent with xenolith thermobarometric and geophysical studies.

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Section: Evolution Of the Eastern Highlandsmentioning

confidence: 99%

Thermal Structure of Eastern Australia's Upper Mantle and Its Relationship to Cenozoic Volcanic Activity and Dynamic Topography

Ball

Czarnota

White

et al. 2021

Geochem Geophys Geosyst

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“…Nonetheless, in a previous paper (Manjón-Cabeza Córdoba and , we quantitatively tested the hypothesis of edge-driven convection as an origin of oceanic intraplate volcanism near continental margins, and our results showed that, by itself, EDC can only support minor magmatism even under the most favorable conditions and is clearly insufficient to generate long-lived island-building volcanism. While other studies have shown that a very steep oceanic-continental transition (Kim and So, 2020;Negredo et al, 2022) or additional geometrical complexities (Duvernay et al, 2021) could increase the amount of EDC-related melting calculated by the companion study, all of them agree that magmatism is very restricted to account for volcanism in the Canary Islands. Furthermore, we speculated that due to the prevalence of EDC with Earth-like mantle properties, most of EDC-related flow and melting should occur near mid-ocean ridges in young lithospheres, which was previously observed by geological (Ligi et al, 2011) andgeodynamic (Buck, 1986;Boutilier and Keen, 1999;Sleep, 2007) studies alike, and not in old lithospheres (as is the case for the Canary Islands).…”

Section: Introductionmentioning

confidence: 55%

“…At these locations, many of the predictions of plume theory are not met. In the Canary Islands (where volcanism is as recent as the 2021 eruption of La Palma) volcano ages do not follow a consistent linear age-distance relationship, with coeval volcanism occurring across several hundreds of kilometers (Abdel-Monem et al, 1971, 1972Thirlwall et al, 2000;Geldmacher et al, 2005), the plume swell is nearly absent (Sleep, 1990;King and Adam, 2014) (although see Huppert et al, 2020), and the duration of volcanism at a single island is longer than expected in comparison with other chains (e.g., Carracedo, 1999). Besides, a cogenetic relation of these volcanoes with Alboran Domain volcanism has been suggested due to tectonism (Doblas et al, 2007) and with the northwest Africa Cenozoic volcanism as part of the same upwelling (Duggen et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, as said above, in this work we did not explore in-depth geometrical considerations of the craton and the continental-oceanic transition. In previous works, several authors noted the importance of these geometrical aspects on conditioning the mantle flow around the edge (Till et al, 2010;Kim and So, 2020;Manjón-Cabeza Córdoba and Ballmer, 2021;Duvernay et al, 2021). In this article, we focused on plume characteristics instead, but we acknowledge that the quantitative inferences made could change when changing craton characteristics, although preliminary tests confirm that results will be qualitatively consistent (Appendix, Fig.…”

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confidence: 99%

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The role of edge-driven convection in the generation ofvolcanism – Part 2: Interaction with mantle plumes, applied to the Canary Islands

Córdoba

Ballmer²

2022

Solid Earth

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Abstract. In the eastern Atlantic Ocean, several volcanic archipelagos are located close to the margin of the African continent. This configuration has inspired previous studies to suggest an important role of edge-driven convection (EDC) in the generation of intraplate magmatism. In a companion paper (Manjón-Cabeza Córdoba and Ballmer, 2021), we showed that EDC alone is insufficient to sustain magmatism of the magnitude required to match the volume of these islands. However, we also found that EDC readily develops near a step of lithospheric thickness, such as the oceanic–continental transition (“edge”) along the western African cratonic margin. In this work, we carry out 3D numerical models of mantle flow and melting to explore the possible interactions between EDC and mantle plumes. We find that the stem of a plume that rises close to a lithospheric edge is significantly deflected ocean-ward (i.e., away from the edge). The pancake of ponding hot material at the base of the lithosphere is also deflected by the EDC convection cell (either away or towards the edge). The amount of magmatism and plume deflection depends on the initial geometric configuration, i.e., the distance of the plume from the edge. Plume buoyancy flux and temperature also control the amount of magmatism, and influence the style and extent of plume–EDC interaction. Finally, comparison of model predictions with observations reveals that the Canary plume may be significantly affected and deflected by EDC, accounting for widespread and coeval volcanic activity. Our work shows that many of the peculiar characteristics of eastern Atlantic volcanism are compatible with mantle plume theory once the effects of EDC on plume flow are considered.

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“…We note that our models are built on viscoelastic solid mechanics in which the mantle convection is not considered. The compressional thickening can cause lithospheric delamination ( Chen, 2021;Kim & So, 2020 ), which affects the buckling mode.…”

Section: Mechanics Of Decoupled Bucklingmentioning

confidence: 99%

Decoupled Lithospheric Folding, Lower Crustal Flow Channels, and the Growth of Tibetan Plateau

Shin

Shum

Braitenberg

et al. 2022

Geophysical Research Letters

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The growth mechanism of the Tibetan Plateau, postulated by a number of hypotheses, remains under intense debate. Our analysis of recent satellite‐based gravity model reveals that Tibetan lithosphere has been decoupled and folded. It is further evidenced by the existence of crustal melts and channel flow that have been observed by seismic and magnetotelluric explorations. Based on 3D geodynamic simulations, we elucidate the exact buckling structures in the upper crust and lithospheric mantle: at mixed wavelengths between ∼240 and ∼400 km, the lower crustal viscosity is smaller than ∼1019 Pa·s, implicating weak lower crustal flow beneath the Plateau. This mixed wavelength is consistent with the result of our inverse gravity modeling. Our results facilitate a new plausible hypothesis that the decoupled lithospheric folding mechanism can explain the growth mechanism of the anomalously thick and wide Tibetan Plateau by conflating our idea and contemporary hypothesized scientific findings.

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Effects of rheology and mantle temperature structure on edge-driven convection: Implications for partial melting and dynamic topography

Cited by 10 publications

References 37 publications

Thermal Structure of Eastern Australia's Upper Mantle and Its Relationship to Cenozoic Volcanic Activity and Dynamic Topography

Thermal Structure of Eastern Australia's Upper Mantle and Its Relationship to Cenozoic Volcanic Activity and Dynamic Topography

The role of edge-driven convection in the generation ofvolcanism – Part 2: Interaction with mantle plumes, applied to the Canary Islands

Decoupled Lithospheric Folding, Lower Crustal Flow Channels, and the Growth of Tibetan Plateau

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