Joint Geodynamic‐Geophysical Inversion Suggests Passive Subduction and Accretion of the Ontong Java Plateau

Huang, Dong; Dai, Liming; Liu, Liang; Jiang, Xiaodian; Li, Sanzhong; Gong, Wei; Wang, Liangliang; Wang, Di; Li, Zhong‐Hai; Yu, Shengyao

doi:10.1029/2022gl100744

Cited by 5 publications

(8 citation statements)

References 42 publications

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“…Now, 50+ years later, the concept of arc polarity reversal is well accepted and widely applied. Indeed, the Solomon Islands have become the type area to compare with geodynamic model studies of a buoyant plateau choking subduction and causing arc reversal (Almeida et al, 2022;Cloos, 1993;Dong et al, 2022;Liu et al, 2021;Sun et al, 2021;Wang et al, 2022aWang et al, , 2022b. But there has been little refinement of the exact timing, cause, and evolution of this event, being only broadly constrained to the period 10 ± 2 Ma.…”

Section: Ontong Java Plateau Subduction/collisionmentioning

confidence: 99%

“…There are no positive velocity anomalies associated with subduction of the Woodlark Basin lithosphere on sections 6-11; it is the Pacific slab that descends to a depth adjacent to the Woodlark Basin (Figure 7). Whether the Australia slab descends vertically with, and parallel to the Pacific slab beneath the collision zone on sections 13 and 14, as geodynamic models such as Dong et al (2022) and Wang et al (2022aWang et al ( , 2022b predict, is not resolved.…”

Section: P-wave Tomographymentioning

confidence: 99%

“…Whether the Australia slab descends vertically with, and parallel to the Pacific slab beneath the collision zone on sections 13 and 14, as geodynamic models such as Dong et al. (2022) and Wang et al. (2022a, 2022b) predict, is not resolved.…”

Section: Primary Datamentioning

confidence: 99%

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Oceanic Plateau and Spreading Ridge Subduction Accompanying Arc Reversal in the Solomon Islands

Taylor,

Benyshek

2024

Geochem Geophys Geosyst

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We study the collision of the Ontong Java Plateau, reversal of the Solomon Islands arc, and subduction of the Woodlark Basin spreading ridge in the southwest Pacific. Double‐sided subduction and intra‐arc deformation, not just polarity reversal, characterize the rapid Australia‐Pacific plate convergence. The rifted margins of the 0–6.2‐Ma Woodlark Basin separate its unflexed young lithosphere without a trench from the older flexed lithosphere with >8‐km‐deep trenches subducting to either side. A gap evident in the seismicity and tomography between the NE‐subducted slabs of the Solomon Sea and Australia plates indicates that the Woodlark lithosphere likely melts and/or is quickly (<1 m.y.) resorbed into the mantle. A section of the Pacific Plate remains attached within the gap and provides the slab pull to form the Malaita accretionary prism. Quaternary arc‐composition volcanoes that occur on both sides of the Woodlark Basin subduction front are not sourced from a mantle wedge overlying a Wadati‐Benioff zone, but come from and through breaks in the young incoming and subducting lithosphere and the overturning mantle beneath. Though the basin is too weak to sustain plate flexure, arc volcanoes on the subducting crust result in locally strong coupling to the forearc, manifest by tsunamigenic earthquakes. At 150–400‐km depth, the subducted slabs under the Solomon Islands are near vertical. They are near‐horizontal between the 410 and 660‐km mantle discontinuities beneath the Woodlark Basin and further south, whereas beneath the Solomon Sea Basin they dip southwest and penetrate the 660‐km discontinuity, having been detached by the north‐dipping Solomon Sea slab.

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Section: Ontong Java Plateau Subduction/collisionmentioning

confidence: 99%

Section: P-wave Tomographymentioning

confidence: 99%

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Oceanic Plateau and Spreading Ridge Subduction Accompanying Arc Reversal in the Solomon Islands

Taylor,

Benyshek

2024

Geochem Geophys Geosyst

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“…The effect of oceanic plateau collision with continental terranes has also been studied, which may lead to the break-off of the subducted slab and result in subduction polarity reversal (Sun et al, 2021). Further on, Wang et al (2022) and Dong et al (2022) combines the effect of arc rheological strength and oceanic plateau collision, proposing that the overriding arc strength plays a more important role in the subduction polarity reversal and the effect of plateau collision is secondary. Similarly, Almeida, Riel, Rosas, Duarte, and Kaus (2022) and Almeida, Riel, Rosas, Duarte, and Schellart (2022) have conduct 3-D and 2-D numerical models, respectively, suggesting that the favorable conditions of subduction polarity reversal include the older (stronger and thicker) downgoing plates and relatively younger (weaker, thinner, and narrower) overriding plates.…”

Section: Comparisons With Previous Modelsmentioning

confidence: 99%

“…In the previous studies, the different modes of collision‐induced subduction jump have generally been investigated separately by different types of geodynamic models. These studies indicate that the favorable conditions of subduction polarity reversal include the positively buoyant and rheologically strong subducting plate, young and weak overriding plate, weak mantle wedge, and so on (Almeida, Riel, Rosas, Duarte, & Kaus, 2022; Almeida, Riel, Rosas, Duarte, & Schellart, 2022; Baes et al., 2011; Dong et al., 2022; Riel et al., 2023; Sun et al., 2021; Wang et al., 2022; S. X. Zhang & Leng, 2021). Alternatively, the subduction transference can be resulting if the overriding plate is rheologically strong or has continental affinity, with other favorable conditions including young and moderate‐sized oceanic plateau with a strongly depleted mantle root, existence of weakness at the far‐end passive margin of the subducting terrane, the forced convergence, and so on (Liu et al., 2021; Tao et al., 2020; Yan et al., 2021; S. H. Yang et al., 2018; Zhong & Li, 2020).…”

Section: Introductionmentioning

confidence: 99%

Terrane Collision‐Induced Subduction Initiation: Mode Selection and Implications for Western Pacific Subduction System

Cui,

2024

Geochem Geophys Geosyst

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In the regime of plate tectonics, the subduction of an oceanic plate generally terminates with the collision and accretion of continental terranes. Then, a new subduction zone may form in the neighboring oceanic plates, which is defined as the terrane collision‐induced subduction initiation (SI). Based on the analyses of the western Pacific subduction system in the Cenozoic, three types of collision‐induced SI have been observed: subduction polarity reversal, subduction transference and far‐field subduction. However, the dynamics and controlling factors of SI mode selection after terrane collision are not clear. In this study, a multi‐terrane collision model has been conducted with variable rheological strength of continental terranes and different convergence velocities. The model results indicate that the relative strength of the terranes controls the SI mode selection, with the new subduction zone tending to form beneath weaker terranes. In addition, the higher convergence velocity can facilitate the collision‐induced SI. An analytical study of force balance has been further conducted, which provides a mechanical explanation for the numerical prediction of a weak overriding terrane as a favorable SI site. The numerical models and force balance analyses are further compared with the natural cases in the western Pacific subduction system. This indicates that subduction polarity reversal is the most favorable mode after terrane collision in the western Pacific, possibly due to the weakness of overriding plate during the preceding subduction‐induced fluid/melt activity. This comprehensive study provides systematic constraints for the dynamics of collision‐induced subduction jump, especially for the western Pacific subduction zones in the Cenozoic.

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Deciphering Subduction Polarity During Ancient Arc‐Continent Collisions

Yan,

Chen,

Zuza

et al. 2024

Geophysical Research Letters

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The closure of an ancient ocean basin via oceanic arc‐continent collision has two subduction styles with opposite polarities, which may proceed via subduction polarity reversal (SPR) or a subduction zone jump (SZJ). Interpreting the geometry or kinematic evolution of ancient collisional zones, especially the original subduction polarity, can be challenging. Here we used 2D thermo‐mechanical modeling to investigate the dynamic evolution process of SPR versus SZJ. Our modeling predicts different structural, topographic, magmatic, and basin histories for SPR and SZJ, which can be compared against, and help interpret, the geologic record past sites of oceanic closure during collisional orogens. Our results match geologic observations of past collisions in Kamchatka, eastern Russia, and the Banda Arc, eastern Indonesia, and thus our results can help effectively decode the evolutionary history of past arc‐continent collisions.

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Joint Geodynamic‐Geophysical Inversion Suggests Passive Subduction and Accretion of the Ontong Java Plateau

Abstract: Oceanic plateau subduction is generally thought to play an important role in both the evolution of the downgoing plate (

Cited by 5 publications

References 42 publications

Oceanic Plateau and Spreading Ridge Subduction Accompanying Arc Reversal in the Solomon Islands

Oceanic Plateau and Spreading Ridge Subduction Accompanying Arc Reversal in the Solomon Islands

Terrane Collision‐Induced Subduction Initiation: Mode Selection and Implications for Western Pacific Subduction System

Deciphering Subduction Polarity During Ancient Arc‐Continent Collisions

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