Coupled and decoupled regimes of continental collision: Numerical modeling

Faccenda, Manuele; Minelli, Giorgio; Gerya, Taras

doi:10.1016/j.epsl.2008.12.021

Cited by 103 publications

(93 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It could be due to the occurrence of large hydrated and partially molten low-viscosity areas in the mantle wedge above the subducting slab of the Adria plate. A similar geodynamic setting has recently been suggested for the northern Apennines of Italy (Faccenda et al, 2009) to explain the thin crustal wedge and the bimodal distribution of stresses within the orogen, with compressional stress in the foreland and extensional stress in the inner part of the northern Apennines. A similar tectonic scenario characterizes the western Pacific subduction zones, which show seismic decoupling and back-arc spreading, such as Mariana, Kermadec, South Tonga, South Ryukyu, etc.…”

Section: New Insights Into the Evolution Of The Apennine Postorogenicsupporting

confidence: 61%

New insights into the onset and evolution of the central Apennine extensional intermontane basins based on the tectonically active L’Aquila Basin (central Italy)

et al. 2017

View full text Add to dashboard Cite

show abstract

Section: New Insights Into the Evolution Of The Apennine Postorogenicsupporting

confidence: 61%

New insights into the onset and evolution of the central Apennine extensional intermontane basins based on the tectonically active L’Aquila Basin (central Italy)

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Gerya et al, 2008;Faccenda et al, 2009;Li et al, 2011;Sizova et al, 2012). These studies showed that the bulk weakening, and simultaneous decrease in crustal density associated with partial melting, allow subducted material to detach and exhume.…”

Section: J Warren: Exhumation Of (Ultra-)high-pressure Terranes 3mentioning

confidence: 98%

Exhumation of (ultra-)high-pressure terranes: concepts and mechanisms

Warren

2013

Solid Earth

111

View full text Add to dashboard Cite

Abstract. The formation and exhumation of high and ultrahigh-pressure, (U)HP, rocks of crustal origin appears to be ubiquitous during Phanerozoic plate subduction and continental collision events. Exhumation of (U)HP material has been shown in some orogens to have occurred only once, during a single short-lived event; in other cases exhumation appears to have occurred multiple discrete times or during a single, long-lived, protracted event. It is becoming increasingly clear that no single exhumation mechanism dominates in any particular tectonic environment, and the mechanism may change in time and space within the same subduction zone. Subduction zone style and internal force balance change in both time and space, responding to changes in width, steepness, composition of subducting material and velocity of subduction. In order for continental crust, which is relatively buoyant compared to the mantle even when metamorphosed to (U)HP assemblages, to be subducted to (U)HP conditions, it must remain attached to a stronger and denser substrate. Buoyancy and external tectonic forces drive exhumation, although the changing spatial and temporal dominance of different driving forces still remains unclear. Exhumation may involve whole-scale detachment of the terrane from the subducting slab followed by exhumation within a subduction channel (perhaps during continued subduction) or a reversal in motion of the entire plate (eduction) following the removal of a lower part of the subducting slab. Weakening mechanisms that may be responsible for the detachment of deeply subducted crust from its stronger, denser substrate include strain weakening, hydration, melting, grain size reduction and the development of foliation. These may act locally to form narrow high-strain shear zones separating stronger, less-strained crust or may act on the bulk of the subducted material, allowing whole-scale flow. Metamorphic reactions, metastability and the composition of the subducted crust all affect buoyancy and overall strength. Future research directions include identifying temporal and spatial changes in exhumation mechanisms within different tectonic environments, and determining the factors that influence those changes.

show abstract

“…7) result in decoupling of the convergent plates. Transition from coupled to decoupled regime occurs always at the early stages of continental collision indicating that insertion of rheologically weak crustal material in the subduction channel is critical for the subsequent evolution of the collision zone (Faccenda et al, 2009). The numerical models confirm that HP-UHP complexes can be formed in both coupled and decoupled channels in the wide range of convergence scenarios (Figs 2-7).…”

Section: Coupled and Decoupled Subduction Channelmentioning

confidence: 59%

“…The numerical models confirm that HP-UHP complexes can be formed in both coupled and decoupled channels in the wide range of convergence scenarios (Figs 2-7). As discussed in Faccenda et al (2009), coupled collision zones (which can be either retreating or advancing) are characterized by a thick crustal wedge and compressive stresses (i.e. Himalaya and Western Alps), while decoupled end-members (which are always retreating) are defined by a thin crustal wedge and bi-modal distribution of stresses (i.e.…”

Section: Coupled and Decoupled Subduction Channelmentioning

confidence: 99%