Thermomechanical models for the dynamics and melting processes in the Mariana subduction system

Lin, Shu Ling; Kuo, Ban‐Yuan; Chung, Sun‐Lin

doi:10.1029/2010jb007658

Cited by 16 publications

(17 citation statements)

References 94 publications

(144 reference statements)

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“…This thinning is most pronounced at the location of the BASC itself, but the effect is evident along much of the upper boundary. The widespread distribution of thinning would likely be reduced with a more sophisticated treatment of the rheology of the overriding plate, in particular one including some form of brittle deformation to allow for localization of strain [ Behn et al , 2002; Lin et al , 2010]. …”

Section: Resultsmentioning

confidence: 99%

“…At the same time, the particle that started further from BASC (particle B) gets entrained by the migrating BASC, and experiences substantial decompression melting before being incorporated into the lithosphere and cooling. These two classes of particle trajectories are characteristic of distinct regions within the mantle wedge [ Lin et al , 2010]. …”

Section: Resultsmentioning

confidence: 99%

“…In particular, the subducting plate sinks through the model domain at a constant angle of 45° (Figure 1). While geodynamic models of individual subduction zones and arc‐BASC systems benefit from the use of more realistic, seismically constrained subducting plate geometries [ Harmon and Blackman , 2010; Lin et al , 2010; Syracuse et al , 2010], the simplified geometry employed here is appropriate for a generic arc‐BASC system. Likewise, the use of a 2‐dimensional model precludes consideration of the complex flow patterns that may develop in 3‐dimensional models due to, for example, slab rollback or along‐strike variations in slab geometry or forcing [ Kincaid and Griffiths , 2003; Schellart , 2004; Schellart et al , 2007; Schellart , 2008; Jadamec and Billen , 2010], but is suitable for the scope of the present study.…”

Section: Methodsmentioning

confidence: 99%

“…This is consistent with our stated goal of understanding how melting beneath the BASC affects the characteristics of the mantle beneath arcs, as the presumed region of hydrous fluid addition is effectively downstream of both the arc and the BASC. However, it has been suggested that flux melting might contribute to melting beneath BASCs, particularly early in the evolution of arc‐BASC systems, when the BASC is closest to the arc [ Martinez and Taylor , 2002; Taylor and Martinez , 2003; Kelly et al , 2006; Langmuir et al , 2006; Harmon and Blackman , 2010; Lin et al , 2010]. To model the effect of water on decompression melting beneath a BASC we employ a uniform water content throughout the entire mantle wedge.…”

Section: Methodsmentioning

confidence: 99%

“…The approach taken differs from previous geodynamic modeling of mantle flow and melting in arc‐BASC systems [ Toksoz and Hsui , 1978; Kincaid and Hall , 2003; Currie et al , 2004; Conder , 2005; Currie and Hyndman , 2006; Harmon and Blackman , 2010] in that the time‐dependent nature of the system is considered explicitly. In particular, the migration of the BASC away from the trench as a natural consequence of spreading [ Ribe , 1989; Lin et al , 2010] is incorporated directly into the model. We find large changes in both the temperature and the composition of the sub‐arc mantle with time, as the BASC migrates away from the arc, that are consistent with the evolutionary model of Cooper et al [2010].…”

Section: Introductionmentioning

confidence: 99%

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Thermochemical evolution of the sub‐arc mantle due to back‐arc spreading

Hall¹,

Cooper²,

Plank³

2012

J. Geophys. Res.

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[1] We present the results of a series of numerical geodynamic experiments designed to characterize the thermal and compositional evolution of the sub-arc mantle in response to spreading in the back-arc. We find large changes in both the temperature and composition of the sub-arc mantle with time as the BASC migrates away from the arc. In particular, the sub-arc mantle becomes increasingly more depleted with time following the onset of spreading, as mantle that has experienced decompression melting and melt extraction beneath the BASC is gradually drawn beneath the arc plate by slab-induced corner flow. The rate at which this depletion increases during the $2 Myr immediately following the onset of spreading is controlled by the spreading rate at the BASC, with faster spreading leading to a more rapid increase in depletion. Following this initial period, depletion within the sub-arc mantle continues to increase at a somewhat slower pace. During this phase, the rate at which depletion increases is chiefly dictated by the subduction rate, with faster subduction leading to a more rapid increase in depletion beneath the arc. Depletion within the sub-arc mantle is also found to increase with increasing mantle potential temperature, decreasing age of the overriding plate, and decreasing distance between the initial location of the BASC and the arc. Predicted changes in the depletion of the sub-arc mantle with time are shown to be consistent with observations of systematic along-strike geochemical variations within a portion of the Tonga Arc adjacent to the Eastern Lau Spreading Center.Citation: Hall, P. S., L. B. Cooper, and T. Plank (2012), Thermochemical evolution of the sub-arc mantle due to back-arc spreading,

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermochemical evolution of the sub‐arc mantle due to back‐arc spreading

Hall¹,

Cooper²,

Plank³

2012

J. Geophys. Res.

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Three‐dimensional mantle circulations and lateral slab deformation in the southern Chilean subduction zone

Lin

2014

JGR Solid Earth

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The along-strike variation in plate properties is a common feature in the subduction zones. The southern Chilean subduction is a notable example where the slab age and length, and the thickness of the overriding plate, vary substantially in the trench-parallel direction. In this study the combined effects of these factors are examined using regional subduction zone models. In the models lateral slab deformation and along-arc pressure gradient in the mantle occur in response to the differential slab retrograde motion due to variations in slab buoyancy and slab strength. The lower portion of the deep segments acts as a slab edge in part, while rollback of the neighboring, shallower segments influences the toroidal motion induced by the adjacent deep segments. These factors together give rise to complex flow patterns and lead to a great extent of trench-parallel components in the mantle wedge and subslab mantle and significant upwelling in the back arc. Mantle circulations are characterized by variable length scales for both toroidal and poloidal motions extending over~1500 km. Such three-dimensional circulations may lead to complicated patterns of seismic anisotropy. The upwelling may result in decompression melting to cause the extensive Patagonian plateau basalts. Our model results indicate that certain segments of the Antarctic slab reach at least 100 km depth. The trajectories of passive tracers show intricate patterns such as helical streamlines and suggest that a recent input from the adjacent subduction zone for slab-derived components of lavas from the Chilean Ridge cannot be ruled out.

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Dynamics of the opposite‐verging subduction zones in the Taiwan region: Insights from numerical models

Lin

Kuo

2016

JGR Solid Earth

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The Taiwan mountain belt between the Eurasian and the Philippine Sea plate is a rare example for an orogen bracketed by two opposite‐verging subduction zones. The influences of the double subduction zones on regional dynamics have long remained unknown. In this study lithospheric deformation and mantle circulation in the Taiwan region are calculated with double subduction‐collision models. The results show that the limitedly deformed subducted Eurasian plate separates the highly deforming orogen above from the highly deforming mantle below. The edge flow driven by the rollback of the Philippine Sea slab dominates in the asthenosphere primarily as a result of the longer slab if the gap between the two slabs beneath Taiwan is sufficiently wide. The induced toroidal current gives rise to a pattern of seismic anisotropy compatible with that measured with teleseismic phases and coincidentally accordant with the strike of the orogen. The additional presence of a frequently hypothesized lithospheric fragment or slab tear disrupts the toroidal circulation and mars the model predictions for seismic anisotropy. We found that the rollback of the Eurasian slab deflects the plate downward and neutralizes the uplift, posing difficulty to models with Eurasian slab extending too far north. These results bolster the view that the Taiwan mountain belt is a subduction‐dominated orogen and both subduction zones play a key role on regional dynamics. Conceptual models specifically developed for large‐scale continent‐continent collision zones that have been commonly applied to the Taiwan region are inadequate for this ocean‐continent, opposite‐verging subduction‐collision system.

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Thermomechanical models for the dynamics and melting processes in the Mariana subduction system

Cited by 16 publications

References 94 publications

Thermochemical evolution of the sub‐arc mantle due to back‐arc spreading

Thermochemical evolution of the sub‐arc mantle due to back‐arc spreading

Three‐dimensional mantle circulations and lateral slab deformation in the southern Chilean subduction zone

Dynamics of the opposite‐verging subduction zones in the Taiwan region: Insights from numerical models

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