A Partial Molten Low‐Velocity Layer Atop the Mantle Transition Zone Beneath the Western Junggar: Implication for the Formation of Subduction‐Induced Sub‐Slab Mantle Plume

Li, Guohui; Zhou, Yuemin; Bai, Liang; Gao, Yuan; Bai, Ling; Zhang, Heng; Hu, Le; Pan, Zaifa; Ju, Chenyong; Zhang, Dingding

doi:10.1029/2021gc010150

Cited by 4 publications

(6 citation statements)

References 52 publications

(134 reference statements)

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“…This cannot be explained by the phase transition of serpentine into dense hydrous magnesium silicate 35 , nor can it be explained by the phase transformation of olivine 36 . Similar LVLs are found worldwide [5][6][7][8][9][10][11][12][13][14][15] , and these results are usually explained as being caused by partial melting induced by water and/or other volatiles (i.e. CO 2 ).…”

Section: Discussionsupporting

confidence: 68%

“…In oceanic subduction zones, e.g. the present circum-Pacific subduction zone 6,7,10,11 , the ancient Asian oceanic subduction zone 5,12,13 and the Tethyan oceanic subduction zone 14,15 , these LVLs are widely explained as partial melting due to hydrous and/or other volatile materials upwelling from the MTZ triggered by slab subduction on a regional or global scale 5,7,[10][11][12][13][14][15] . Although numerical modelling shows that this process can be expected on a regional 4 or global 1 scale, direct observational evidence to construct the relationship between such an LVL and a subducted slab is still absent.…”

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confidence: 99%

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Upper mantle melt caused by a subducted slab in the Indian-Eurasian continental subduction zone

Li,

Zhou,

Bai

et al. 2023

Commun Earth Environ

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A low-velocity layer atop the mantle transition zone has been extensively observed worldwide. In subduction zones, this layer is widely explained as partial melting triggered by slab subduction on a regional or global scale. However, direct observational evidence is still absent, and the response of the layer to slab subduction is not well known. Here, we image the seismic velocity around the mantle transition zone by matching synthetic and observed triplicated seismic P and sP waveforms in the Indian–Eurasian continental subduction zone. Our observations reveal a laterally varied low-velocity layer atop the mantle transition zone beneath the Hindu Kush, where a subducted slab extends to the mantle transition zone. The geometric morphology of the low-velocity layer documents that it is a partially molten layer induced by the subducted slab on a regional scale. Interestingly, our observations also support that the layer has a low viscosity. The decreased viscosity may facilitate slab motion in the deep mantle, contributing to slab stretching, tearing and break-off and its resultant rare recurring large intermediate-depth earthquakes in an intracontinental setting.

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Section: Discussionsupporting

confidence: 68%

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confidence: 99%

Upper mantle melt caused by a subducted slab in the Indian-Eurasian continental subduction zone

Li,

Zhou,

Bai

et al. 2023

Commun Earth Environ

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“…It is natural to associate the mantle upwelling with the cold slab remnants descending through the MTZ. Previous results (Li et al, 2021(Li et al, , 2022 claimed that the ancient subduction slab in western CAOB can induce the formation of the hydrous partial molten LVL that is now preserved. The obvious LVL atop the D410 in these areas may also confirm the role of the subducted slab.…”

Section: No Deep Mantle Plume Underneath Hangay Domementioning

confidence: 94%

“…The wide existence of the LVL in the interior continent is more likely to be related to ancient and/or present plate subduction, especially in the subduction zone (Revenaugh & Sipkin, 1994). Recent studies have documented that the hydrous LVL atop the D410 beneath eastern Asia around the circum-Pacific subduction zone (Han et al, 2021;Wei & Shearer, 2017;Yang & Faccenda, 2020) and the western CAOB (Li et al, 2021(Li et al, , 2022 were thought to strongly influence the magma activities of the intraplate volcanoes.…”

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confidence: 99%

Hydrous Melting Driven Upwelling From the Mantle Transition Zone in the Mongolia Plateau Revealed by Receiver Function Analysis

He¹,

et al. 2022

JGR Solid Earth

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Mongolia Plateau, located at the center of Central Asian Orogenic Belt (CAOB) and close to the frontier of the subducting Pacific slab, is widely distributed with the young active intracontinental volcanism (Figure 1). There is a controversial debate about the mechanism or origin of the widely dispersed, long-term intraplate Cenozoic magmatism. Several upper mantle low-velocity or low-density zones (M.

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“…(3) Recent seismic studies show that deep asthenosphere in central-eastern Asia is generally characterised by low seismic velocities (Zhao, 2021;Li et al, 2022a). This low-velocity anomaly can extend westward beneath the Western Junggar basin and has been interpreted as partial melting induced by addition of volatile components from ancient subducted slabs (Li et al, 2022b).…”

Section: Carbonate Recycling From Superposed Subductions In Central-e...mentioning

confidence: 99%

Phantom recycled carbonates and mantle pyroxenites: insight from the low-δ26Mg intraplate basaltic province across central-eastern Asia

Dai

Zheng

Xiong

et al. 2022

Preprint

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Mass recycling from subduction to magmatic extrusion shapes our habitable environment and Earth's interior. Subducted igneous crust may form pyroxenites before participating magmatism, but the deep journey of associated carbonates remains unclear. Here we report new Mg-isotope data for ˜89 to 81 Ma basaltic rocks in Langshan area, central Asia (δ 26 Mg = -0.391 to -0.513 synthesis for post-110 Ma basalts across eastern Asian continent. The merged low-δ 26 Mg basaltic province normally interpreted as derivations from carbonated sources paradoxically displays geochemical signatures (low Ca/Al and high K 2 O contents) resembling partial melts of uncarbonated sources. Negative correlations of δ 26 Mg vs TiO 2 and FCKANTMS, the proxy of pyroxenitic melts, and adiabatic melting modeling suggest presence of Mg-isotopically light source pyroxenites transformed from decarbonated altered oceanic crust. This may explain ubiquitous pyroxenitic contributions in many low-δ 26 Mg basaltic suites and has significant implication for deep carbon cycling. Hosted fileessoar.10512814.1.docx available at https://authorea.com/users/563886/articles/610974phantom-recycled-carbonates-and-mantle-pyroxenites-insight-from-the-low-%CE%B426mgintraplate-basaltic-province-across-central-eastern-asia Phantom recycled carbonates and mantle pyroxenites: insight from the low-26 Mg intraplate basaltic province across central-eastern Asia

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A Partial Molten Low‐Velocity Layer Atop the Mantle Transition Zone Beneath the Western Junggar: Implication for the Formation of Subduction‐Induced Sub‐Slab Mantle Plume

Cited by 4 publications

References 52 publications

Upper mantle melt caused by a subducted slab in the Indian-Eurasian continental subduction zone

Upper mantle melt caused by a subducted slab in the Indian-Eurasian continental subduction zone

Hydrous Melting Driven Upwelling From the Mantle Transition Zone in the Mongolia Plateau Revealed by Receiver Function Analysis

Phantom recycled carbonates and mantle pyroxenites: insight from the low-δ26Mg intraplate basaltic province across central-eastern Asia

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