Geodynamic effects of subducted seamount at the Manila Trench: Insights from numerical modeling

Cheng, Zhizhong; Ding, Weiwei; Faccenda, Manuele; Li, Jiabiao; Lin, Xiubin; Ma, Lukuo; Fang, Penggao; Ding, Hanghang

doi:10.1016/j.tecto.2019.05.011

Cited by 17 publications

(10 citation statements)

References 75 publications

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“…These ages coincide with the beginning of subduction of the buoyant Inca oceanic plateau, thus increasing crustal compression in the overriding plate, and making good conditions for the Yanacocha gold deposit. This similar situation has also occurred at the Baguio Mineral District in Luzon, Philippines (Cheng et al, 2019;Shao et al, 2015), where Scarborough seamount chain subduction resulted in flat-slab subduction and formation of epithermal gold -porphyry copper deposits (Figure 10b;Yumul Jr. et al, 2020).…”

Section: Formation Of the Porphyry Copper And Gold Depositssupporting

confidence: 54%

“…Also showing the location of the inferred Inca oceanic plateau at the present time (Gutscher, Olivet, Aslanian, Maury, & Eissen, 1999) and at 10–12 Ma (Rosenbaum et al, 2005); (b) Tectonic framework of the eastern South China Sea (Shao, Chung, Chen, Lee, & Xie, 2015). Yellow dashed lines denote the locations of the Scarborough seamount chain (Cheng et al, 2019; H. Q. Liu et al, 2020)…”

Section: The Effect Of Seamount Chains Subductionmentioning

confidence: 99%

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The effect of seamount chain subduction and accretion

Yang

Tong

et al. 2022

Geological Journal

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Seamount chains (oceanic plateaus, submarine ridges) are unique morphologic features on the seafloor, which resulted from the motion of the lithosphere over a convective plume. Seamount chains are being carried along by plate motions, which are eventually subducted beneath continental/oceanic plates or accreted in the accretionary complex, thus causing a series of effects in the convergent margin. In this paper, we briefly review the distribution and features of the typical modern seamount chains, including Hawaiian‐Emperor and Louisville seamount chains, Cocos, Ninetyeast and Caroline ridges, and Ogasawara Plateau, and mainly focus on the effects of seamount chains subduction and accretion. The geological effects mainly include the following: (1) deformation and tectonic erosion of the overriding plate; (2) flat‐slab subduction in the convergent margin; (3) growth of continental crust through time; (4) subduction initiation of plate tectonics; (5) generation of large earthquakes; (6) magmatism of the volcanic arc; and (7) formation of porphyry copper and gold deposits. The subduction of seamount chains resulted in similar effects in the Central Asian Orogenic Belt (CAOB) which is one of the largest and longest‐lived accretionary orogens on Earth. However, there are still many aspects that need further improvements, such as identification of the seamounts in the geological record, and geodynamic effects of subducted seamount chains. A detailed study on these sides of the seamount chains will enable us to further understand the tectonic evolution and metallogenesis of the CAOB, especially in accretionary orogenesis, continental crust growth, and subduction initiation dynamics.

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Section: Formation Of the Porphyry Copper And Gold Depositssupporting

confidence: 54%

Section: The Effect Of Seamount Chains Subductionmentioning

confidence: 99%

The effect of seamount chain subduction and accretion

Yang

Tong

et al. 2022

Geological Journal

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“…The steepness of the Manila geomorphology varies: the dip angles along the MnT increasing gradually southwards from ca. 25°at the latitudes between 18°and 21°N, 32°at the latitude 17°N, and nearly vertical at the latitude 14°N [93]. The tectonic front of the MnT continuing northward into the frontal thrust faults in the western Taiwan shows active plate boundary between the Eurasian and Philippine Sea plates in the Luzon-Taiwan region [768].…”

Section: Manila Trenchmentioning

confidence: 97%

Deep-Sea Trenches of the Pacific Ocean: A Comparative Analysis of the Submarine Geomorphology Using Data Modeling by Gmt, Python and R

Lemenkova

2021

SSRN Journal

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“…width), such as the subducting Huangyan-Zhenbei seamounts chain. Based on high-resolution P-wave tomographic images, the morphology of the subducted SCS plate beneath the southern segment of the Manila trench showed no abrupt change in dipping angle (Figure 1C), whereas slab break-off might occur at the depths between 60 and 190 km near 17 °N (Cheng et al, 2019). The trench shape and subducting slab morphology of the northern Manila trench are distinct from the southern segment.…”

Section: Introductionmentioning

confidence: 99%

Bathymetric Highs Control the Along-Strike Variations of the Manila Trench: 2D Numerical Modeling

Chen

Cheng

et al. 2022

Front. Earth Sci.

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The Manila Trench is located at the eastern boundary of the South China Sea (SCS). It develops through the subduction of the SCS beneath the Philippine Sea Plate (PSP) since the early Neogene, driven by the northwestern plate motion of the PSP. The northern segment of the Manila trench at around 18° N—21.5°N is characterized by an obvious eastward convex in the trench shape and abrupt changes of slab dip angle, whereas the southern segment of the Manila trench at around 15°N—18°N is featured by an almost straight NS-trending trench line and smooth subducting slab morphology. However, the cause for the along-strike variations along the Manila trench remains poorly understood. In this study, we use 2-D thermo-mechanical modeling to investigate how bathymetric highs embedded in the subducting slab affect the topography of overriding plate and the morphology of subducting plate. Three major factors of bathymetric highs are systematically examined: 1) the crustal properties, 2) the width, and 3) the thickness. Geodynamic results suggest that the most important factor controlling abrupt changes in dipping angle is the crustal properties of bathymetric highs. Also, reduction of crustal thickness and increasing the width of continental bathymetric highs favor the abrupt change of dipping angle, whereas thicker (≥25 km) bathymetric highs are more likely to be blocked in the subduction zone before slab break-off. According to our numerical modeling results, we suggest that dramatic changes in the dip angle in the northern Manila trench and the convex shape were caused by subduction of a large thin continental terrane, whereas the smooth morphology of subducting slab in the southern segment and straight trench were associated with normal oceanic subduction with small seamounts.

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Geodynamic effects of subducted seamount at the Manila Trench: Insights from numerical modeling

Cited by 17 publications

References 75 publications

The effect of seamount chain subduction and accretion

The effect of seamount chain subduction and accretion

Deep-Sea Trenches of the Pacific Ocean: A Comparative Analysis of the Submarine Geomorphology Using Data Modeling by Gmt, Python and R

Bathymetric Highs Control the Along-Strike Variations of the Manila Trench: 2D Numerical Modeling

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