Slab interactions in the Taiwan region based on the P- and S-velocity distributions in the upper mantle

Koulakov, Ivan; Wu, Yih‐Min; Huang, Hsin‐Hua; Добрецов, Н Л; Jakovlev, Andrey; Zabelina, I.; Jaxybulatov, Kairly; Червов, В. В.

doi:10.1016/j.jseaes.2013.09.026

Cited by 21 publications

(27 citation statements)

References 37 publications

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“…Our tomographic results in this profile are consistent with other previous tomographic results at the same latitude (Lallemand et al 2001;Koulakov et al 2014).…”

Section: Resultssupporting

confidence: 93%

Tomographic evidence for a slab tear induced by fossil ridge subduction at Manila Trench, South China Sea

Fan

Spence

2014

International Geology Review

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A tomographic travel-time inversion has been applied to trace the subducted slab of the South China Sea (SCS) beneath the Manila Trench. The dataset, taken from the International Seismological Centre , is composed of 13,087 P-wave arrival times from 1401 regional earthquakes and 8834 from 1350 teleseismic events. The results image the different morphology of the subducted SCS slab as a high-velocity zone. The subducting angle of the slab varies along the trench: at 16°N and 16.5°N, the slab dips at a low angle (24°~32°) for 20-250 km depth and at a moderate angle (50°) for~250-400 km depth. At 17°N, the slab dips at a low angle (32°) to near 400 km depth, and at 17.5°N and 18°N the slabs are near vertical from 70~700 km depth, while at 20°N the high-velocity anomalies exhibit features from horizontal abruptly to near vertical, extending to 500 km depth. The dramatic steepening of the slab between 17°N and 17.5°N may indicate a slab tear, which is coincident with the axis of a fossil ridge within the SCS slab at around 17°N. In addition, low-velocity zones in the three profiles above 300 km depth may represent the formation of the slab window, induced by ridge subduction and slab tear, initiating upward mantle flow and resulting in the partial melting of the edge of the slab. The slab tear could explain the volcanic gap and geochemical difference between the extinct Miocene and Quaternary volcanoes in the Luzon Arc, the much higher heat flow around the fossil ridge, and the distribution of most of the adakites and the related porphyry Cu-Au deposits in the Luzon area. Based on the geometry and morphology of the subducted slab and certain assumptions, we calculate the initial time of ridge subduction, which implies that ridge subduction and slab tear possibly started at~8 Ma.

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“…Our tomographic results in this profile are consistent with other previous tomographic results at the same latitude (Lallemand et al 2001;Koulakov et al 2014).…”

Section: Resultssupporting

confidence: 93%

Tomographic evidence for a slab tear induced by fossil ridge subduction at Manila Trench, South China Sea

Fan

Spence

2014

International Geology Review

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“…The most prominent feature is a linear high‐velocity (high‐V) zone, which most likely reflects the subducted Eurasian Plate beneath the Luzon Arc. The high‐V zone is coincident with the Wadati‐Benioff zone, and it was also imaged by the previous regional and global tomographic studies [e.g., Bijwaard et al ., ; Lallemand et al ., ; Wang et al ., ; Wu et al ., ; Zhao et al ., ; Koulakov et al ., ].…”

Section: Resolution Tests and Resultsmentioning

confidence: 88%

Subduction of a buoyant plateau at the Manila Trench: Tomographic evidence and geodynamic implications

Fan

Zhao

Dong

2016

Geochem Geophys Geosyst

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We determined P‐wave tomographic images by inverting a large number of arrival‐time data from 2749 local earthquakes and 1462 teleseismic events, which are used to depict the three‐dimensional morphology of the subducted Eurasian Plate along the northern segment of the Manila Trench. Dramatic changes in the dip angle of the subducted Eurasian Plate are revealed from the north to the south, being consistent with the partial subduction of a buoyant plateau beneath the Luzon Arc. Slab tears may exist along the edges of the buoyant plateau within the subducted plate induced by the plateau subduction, and the subducted lithosphere may be absent at depths greater than 250 km at ∼19°N and ∼21°N. The subducted buoyant plateau is possibly oriented toward NW‐SE, and the subducted plate at ∼21°N is slightly steeper than that at ∼19°N. These results may explain why the western and eastern volcanic chains in the Luzon Arc are separated by ∼50 km at ∼18°N, whereas they converge into a single volcanic chain northward, which may be related to the oblique subduction along the Manila Trench caused by the northwestern movement of the Philippine Sea Plate. A low‐velocity zone is revealed at depths of 20–200 km beneath the Manila Accretionary Prism at ∼22°N, suggesting that the subduction along the Manila Trench may stop there and the collision develops northward. The Taiwan Orogeny may originate directly from the subduction of the buoyant plateau, because the initial time of the Taiwan Orogeny is coincident with that of the buoyant plateau subduction.

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“…Further to the north (Profile DD′), the shallow portion of the mantle then starts retreating due to the westward impingement of the PSP (denoted by dotted line). In fact, previous studies of regional [ Koulakov et al ., ] and global tomography [ Lallemand et al ., ; Li et al ., ] have confirmed the presence of a massive high‐Vp slab at great depth under Taiwan but lacked a good resolution at shallow depth. The building of the detailed 3‐D geometry of the EP in this study could therefore bridge the gap for studying the tectonics of this region.…”

Section: Tectonic Implications and Discussionmentioning

confidence: 99%

Investigating the lithospheric velocity structures beneath the Taiwan region by nonlinear joint inversion of local and teleseismicPwave data: Slab continuity and deflection

Huang

Song

et al. 2014

Geophys. Res. Lett.

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The interaction between two flipping subduction systems shapes the complicated lithospheric structures and dynamics around the Taiwan region. Whether and in what form the Eurasian Plate subducts/deforms under Taiwan Island is critical to the debate of tectonic models. Although an east dipping high-velocity anomaly down to a depth below 200 km has been reported previously, its detailed morphology remains uncertain and leads to different interpretations. With a two-step strategy of nonlinear joint inversion, the slab images of the Eurasian Plate were retrieved in a geometry that is hyperthin in the south, becoming massive and steeper in the central, and severely deformed in the north. The possible depth and dimension of a slab break were also investigated through synthetic tests of whether the slab had torn. Moreover, the slab deflection found at~23.2°N latitude seems to correspond to where the nonvolcanic tremors and recent NW-SE striking structures have occurred in southern Taiwan.

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Slab interactions in the Taiwan region based on the P- and S-velocity distributions in the upper mantle

Cited by 21 publications

References 37 publications

Tomographic evidence for a slab tear induced by fossil ridge subduction at Manila Trench, South China Sea

Tomographic evidence for a slab tear induced by fossil ridge subduction at Manila Trench, South China Sea

Subduction of a buoyant plateau at the Manila Trench: Tomographic evidence and geodynamic implications

Investigating the lithospheric velocity structures beneath the Taiwan region by nonlinear joint inversion of local and teleseismicPwave data: Slab continuity and deflection

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