Imaging the mantle transition zone beneath eastern and central China with CEArray receiver functions

Wang, Xinling; Niu, Fenglin

doi:10.1007/s11589-011-0770-x

Cited by 15 publications

(13 citation statements)

References 30 publications

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“…The present tomographic model shows broad high‐V anomalies representing the stagnant Pacific slab in the mantle transition zone under eastern and central NCC, having a gap from under Datong volcano to the edge of Bohai Sea which may allow for hot material upwelling (Figures 13, 14, and 17). These results are not only consistent with those from recent tomography [e.g., Tian et al , 2009], but also confirm what was already observed by receiver function analysis showing a thick transition zone under eastern NCC and a relatively thick zone under some parts of central NCC, except for a thin mantle transition zone under Datong volcano [e.g., Chen and Ai , 2009; Wang and Niu , 2011; Xu et al , 2011]. Similar a slab gap has also been found under the North American plate for the Yellowstone plume [e.g., Xue and Allen , 2007; Sigloch et al , 2008; Obrebski et al , 2010; James et al , 2011].…”

Section: Discussionsupporting

confidence: 92%

“…100–140 Ma) [e.g., Fukao et al , 1992; Zhao , 2004; Li and van der Hilst , 2010] and then finally collapsed down to the lower mantle. Receiver function analyses showed a thickened mantle transition zone under eastern and central NCC but a thinned mantle transition zone under Datong volcano [e.g., Chen and Ai , 2009; Wang and Niu , 2011; Xu et al , 2011]. Either way, all these results suggest that the origin of the Datong volcano and Bohai Sea upwelling may be related to the dehydration of the stagnant Pacific slab in the mantle transition zone, but the present study emphasizes that the low‐V anomalies under Datong volcano and Bohai Sea could represent a mantle plume from the lower mantle.…”

Section: Discussionmentioning

confidence: 99%

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Upper‐mantle tomography and dynamics beneath the North China Craton

Lei

2012

J. Geophys. Res.

100

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[1] A high-resolution tomographic model of the upper mantle beneath the North China Craton (NCC) is determined using a large number of precisely hand-picked teleseismic P wave arrival times. The results are generally consistent with previous results but high-quality arrivals provide new insights into the dynamics beneath the NCC. Obviously north-south trending low-velocity (low-V) zones are revealed down to $300-400 km depth under the Shanxi rift and Tanlu fault zone, while a north-south trending high-velocity (high-V) zone representing the remainder of detached lithosphere is visible down to $200 km depth under the western portion of eastern NCC. High-V anomalies representing the detached lithosphere are detected at 200-400 km depth under central and eastern NCC. Under the Ordos block high-V anomalies are visible above $400 km depth, indicating intact lithosphere. Broad high-V anomalies representing the stagnant Pacific slab are imaged with a low-V anomaly from Datong volcano to the edge of Bohai Sea in the mantle transition zone beneath eastern and central NCC, suggesting that the Pacific slab has subducted to central NCC but with a gap. A continuously Y-shaped low-V structure is clearly imaged under Datong volcano and Bohai Sea from the lower mantle through this gap in the mantle transition zone to the upper mantle, indicating the existence of a lower mantle plume. These results suggest that in addition to the subduction of the Pacific plate, the plume has also played an important role in lithospheric destruction by thermal erosion of the asthenosphere and detachment of the lithosphere beneath the NCC.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Upper‐mantle tomography and dynamics beneath the North China Craton

Lei

2012

J. Geophys. Res.

100

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“…6a). We note that although the absolute depths of the 410 and 660 have some differences with that obtained by Wang and Niu (2011), the general pattern of the MTZ thickness is similar.…”

Section: Discussionsupporting

confidence: 47%

“…We filtered the RFs between 0.03 and 0.2 Hz before time-to-depth migration. Wang and Niu (2011) showed that the features of the 410 and 660 varied little when using the available 3D tomographic model in eastern China. Therefore, we choose the 1D IASP91 model (Kennett and Engdahl, 1991) for calculation.…”

Section: Methodsmentioning

confidence: 99%

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Lateral Variations of the Mantle Transition Zone Structure beneath Eastern China

Huang

Wang

et al. 2014

Bulletin of the Seismological Society of America

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The mantle transition zone (MTZ) structure beneath eastern China is studied by using P-wave receiver functions. The 410 km discontinuity is relatively flat whereas the depth of the 660 km discontinuity varies significantly under the study area. This indicates that the 660 is more influenced by laterally varying temperature. The 520 km discontinuity is continuously observed at ∼520 km depth under a limited area. Within the South China Block, the MTZ thickness under the Yangtze Craton is larger than normal whereas that under the Cathaysia Block is nearly normal. This indicates colder temperature affecting the MTZ beneath the Yangtze Craton. Combined with seismic tomography, our result suggests that the stagnant ancient slab beneath eastern China is mainly trapped around the base of the MTZ beneath the Yangtze Craton in the study area.

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Upper mantle discontinuity structure beneath eastern and southeastern Tibet: New constraints on the Tengchong intraplate volcano and signatures of detached lithosphere under the western Yangtze Craton

Zhang

Gao

et al. 2017

JGR Solid Earth

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We present new constraints on the upper mantle transition zone structure beneath eastern and southeastern Tibet based on P wave receiver functions for a large broadband data set from two very dense seismic arrays. A clear depression of both the 410 km and 660 km discontinuities is detected west of the Red River fault relative to the east. The correlated topographic variations across the Red River fault are indicative of temperature changes in the upper mantle above the transition zone, which suggests that the fault is a deep‐rooted structure that penetrates into the upper mantle and separates Indochina from South China. West of the Red River fault, the transition zone thickness under the Tengchong volcano is found to be normal compared to the global average. This strongly suggests that the intraplate volcano may originate from slab tearing of the eastward subducting Indian plate at shallow depths in the upper mantle rather than from dehydration of a flattened plate within the transition zone. Our results further show that the 660 km discontinuity is significantly depressed under the western Yangtze Craton and that the transition zone therefore thickens by up to 20 km. This thickening is suggestive of lowered temperatures associated with a remnant of detached lithosphere in response to overlying asthenospheric escape flow in and around the western Yangtze Craton. In addition, we find that the transition zone thickness beneath much of the Sichuan Basin is similar to the global average.

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Imaging the mantle transition zone beneath eastern and central China with CEArray receiver functions

Cited by 15 publications

References 30 publications

Upper‐mantle tomography and dynamics beneath the North China Craton

Upper‐mantle tomography and dynamics beneath the North China Craton

Lateral Variations of the Mantle Transition Zone Structure beneath Eastern China

Upper mantle discontinuity structure beneath eastern and southeastern Tibet: New constraints on the Tengchong intraplate volcano and signatures of detached lithosphere under the western Yangtze Craton

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