Structural variation of the Bonin ridge revealed by modeling of seismic and gravity data

Kodaira, Shuichi; Fujiwara, Toshiya; Noguchi, Naoto; Takahashi, Narumi

doi:10.5047/eps.2011.06.036

Cited by 4 publications

(2 citation statements)

References 29 publications

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“…This suggests a density contrast of 12–18% compared with the oceanic upper mantle (~3300 kg/m 3 ) (Figure c). This conclusion is consistent with joint gravity and seismic modeling of the relic arc immediately behind the Bonin Ridge in which the density at 20 km is ~12% lower than surrounding mantle in which the low density root extends to more than 30 km depth [ Kodaira et al ., ]. Laboratory studies show that the existence of quartz and water may significantly reduce the lithospheric strength of the middle and lower crust for the continents [ Kohlstedt et al ., ].…”

Section: Introductionmentioning

confidence: 99%

Subduction initiation at relic arcs

Leng

Gurnis

2015

Geophysical Research Letters

106

110

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Although plate tectonics is well established, how a new subduction zone initiates remains controversial. Based on plate reconstruction and recent ocean drilling within the Izu‐Bonin‐Mariana, we advance a new geodynamic model of subduction initiation (SI). We argue that the close juxtaposition of the nascent plate boundary with relic oceanic arcs is a key factor localizing initiation of this new subduction zone. The combination of thermal and compositional density contrasts between the overriding relic arc, and the adjacent old Pacific oceanic plate promoted spontaneous SI. We suggest that thermal rejuvenation of the overriding plate just before 50 Ma caused a reduction in overriding plate strength and an increase in the age contrast (hence buoyancy) between the two plates, leading to SI. The computational models map out a framework in which rejuvenated relic arcs are a favorable tectonic environment for promoting subduction initiation, while transform faults and passive margins are not.

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Section: Introductionmentioning

confidence: 99%

Subduction initiation at relic arcs

Leng

Gurnis

2015

Geophysical Research Letters

106

110

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“…In theory, due to along-arc variations in oceanic island arcs, Bouguer anomalies, through gravity/density inversion, can also be used to produce subsurface models of the oceanic island arcs. For instance, Bouguer anomalies, albeit with additional constraints from seismic data, have been previously applied to produce subsurface models of the Bonin arc (e.g., Kodaira et al, 2011).…”

Section: Bouguer Anomalies As Proxies To Crustal Thickness Estimationsmentioning

confidence: 99%

Enhanced arc magmatic productivity of the Western Pacific island arcs deduced from gravity-derived arc crustal growth rates

Parcutela

Austria²,

Dimalanta³

et al. 2023

Front. Earth Sci.

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Island arcs are postulated as the juvenile components that contribute to the growth of continental crust. Growth rates of arc crusts were previously computed using crustal thicknesses derived from seismic data. Consequently, crustal growth rates of oceanic island arcs are also constrained by the limited seismic data availability. This work presents the first comparison of gravity-derived magmatic growth rates of Western Pacific oceanic island arcs. We used the statistical correlation between Bouguer anomalies and seismic-derived crustal thicknesses to generate an empirical formula. The new empirical formula was utilized to estimate the crustal thicknesses of oceanic island arcs using Bouguer anomalies from the EGM2008 global gravity model. The resulting crustal thicknesses were employed to compute the magmatic growth rates of western Pacific island arcs and the Philippine island arc system. The latest magmatic growth rate estimates show that the magmatic productivity of Western Pacific island arcs, which are directly associated with Pacific Plate subduction, is significantly higher (28–60 km3/km/m.y). The growth rate of the Pacific island arcs is higher compared to the magmatic growth rate computed for the other oceanic island arcs (12–25 km3/km/m.y), which are derived from the subduction of other oceanic lithospheres (i.e., the Philippine Sea Plate; Caribbean Sea Plate; and Eurasia-South China Sea slabs). This is attributed to the variation in the ages of the subducting plates. The Pacific Plate, being older, is associated with higher degrees of serpentinization and sediment cover, which introduce more volatiles inducing more robust partial melting of the mantle wedge.

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Strength of plate coupling in the southern Ryukyu subduction zone

Doo

et al. 2018

Tectonophysics

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Structural variation of the Bonin ridge revealed by modeling of seismic and gravity data

Cited by 4 publications

References 29 publications

Subduction initiation at relic arcs

Subduction initiation at relic arcs

Enhanced arc magmatic productivity of the Western Pacific island arcs deduced from gravity-derived arc crustal growth rates

Strength of plate coupling in the southern Ryukyu subduction zone

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