Pre-collisional extension of microcontinental terranes by a subduction pulley

Gün, Erkan; Pysklywec, R. N.; Gogus, O.; Topuz, Gültekın

doi:10.1038/s41561-021-00746-9

Cited by 18 publications

(10 citation statements)

References 61 publications

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“…When approaching the YT, the CP was very young (G. Zhang et al., 2020) and easier to be stretched. In addition, forward geodynamic numerical experiments show that significant pre‐collisional extension of a microcontinental terrane could occur before it collides with a trench, ascribed to pull of the subducted slab (Gün et al., 2021). Furthermore, we reinterpreted two multichannel seismic transects collected from Z. Zhang, Dong, Sun, & Zhang (2021) and found detachment faults formed in the horst and graben structure zone (Figure S18 in Supporting Information ).…”

Section: Discussionmentioning

confidence: 99%

Seismic Structure of the Caroline Plateau‐Yap Trench Collision Zone

Fan

Zheng

Zhao

et al. 2022

Geophysical Research Letters

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Collision of oceanic plateaus with trenches has played a key role in the continental growth and plate tectonic reorganizations throughout the Earth's history. However, the understanding of collision between an initially rifted plateau with a trench is still deficient. Here we conduct the first seismic tomography and receiver function analyses in the Yap subduction zone, western Pacific Ocean, where the initially rifted Caroline Plateau is colliding with the Yap Trench. Our results reveal horizontal and overturned slabs south and north of the Sorol Trough, respectively, which may be caused by slab breakoff followed by underplating and eastward mantle flow with ultra‐slow convergence. The distinct slab morphologies could be responsible for the short‐lived arc volcanism (11‐7 Ma), horst‐graben structures, different Bouguer gravity anomalies and stress regimes in the Yap subduction zone. The overturned slab may cause the incoming plateau to be stretched to facilitate the initial plateau subduction.

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Section: Discussionmentioning

confidence: 99%

Seismic Structure of the Caroline Plateau‐Yap Trench Collision Zone

Fan

Zheng

Zhao

et al. 2022

Geophysical Research Letters

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“…2.2–2.0 Ga, whereas several contemporaneous, extension‐related A‐type granitoids and mafic dykes have been reported in the central portion of the craton (Figure 14). Recent researchers suggest that prior to continent‐continent collision, significant extension occurred in the upper plate during Andean‐type subduction along the cratonal margin (e.g., Gün et al., 2021). Also, the major oxide, trace element, and isotope geochemical compositions of the A‐type granitoids suggest that they were associated with differentiation of contemporaneous mafic rocks (J. Liu et al., 2021).…”

Section: Discussionmentioning

confidence: 99%

Paleoproterozoic Plate Tectonics Recorded in the Northern Margin Orogen, North China Craton

Wang

Zuza

et al. 2022

Geochem Geophys Geosyst

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“…Subduction of the outermost margin (i.e., continent–ocean transition zone), including the MSN rocks, started in the late Cambrian, while the more proximal LSN rocks approached the subduction zone. The LSN rocks undergo a substantial extension before their collision with the upper plate, owing to pull from the trenchward part of the subducting plate (Gün et al, 2021). In this scenario, extension of the lower plate could cause decompression melting of the deeper crustal levels, that is, in the crystalline basement beneath the sedimentary basin of the LSN (Li et al, 2021), and provoke the emplacement of the leucocratic orthogneiss protolith into the LSN.…”

Section: Discussionmentioning

confidence: 99%

“…In this scenario, extension of the lower plate could cause decompression melting of the deeper crustal levels, that is, in the crystalline basement beneath the sedimentary basin of the LSN (Li et al, 2021), and provoke the emplacement of the leucocratic orthogneiss protolith into the LSN. The focus of the extension on the continental lithosphere embedded within the oceanic lithosphere might be due to the rheology and thickness differences between the oceanic and continental crust as demonstrated by Gün et al (2021). As subduction proceeded, the rocks of the LSN were introduced into the subduction zone and reached peak conditions before being exhumed and overthrusted by the MSN.…”

Section: Geodynamic Significance Of the Lsn Evolutionmentioning

confidence: 99%

Deciphering the tectonometamorphic history of subducted metapelites using quartz‐in‐garnet and Ti‐in‐quartz (QuiG–TiQ) geothermobarometry—A key for understanding burial in the Scandinavian Caledonides

Jeanneret

Klonowska

Barnes

et al. 2022

Journal Metamorphic Geology

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The Seve Nappe Complex is a subduction‐related high‐grade metamorphic unit that was emplaced onto the margin of Baltica during Caledonian orogenesis. In this paper, the tectonometamorphic evolution of the Lower Seve Nappe in the Scandinavian Caledonides was characterized with the help of the continuous Collisional Orogeny in the Scandinavian Caledonides (COSC‐1) drill core, using a combination of various P–T estimation techniques based on garnet–quartz mineral pairs (quartz‐in‐garnet and Ti‐in‐quartz [QuiG–TiQ]), conventional thermobarometry and thermodynamic modelling of phase equilibria. This multi‐method approach yields complementary results and delivers critical data to constrain a comprehensive pressure–temperature–deformation–time (P–T–D–t) evolutionary path for the metasedimentary rocks of the Lower Seve Nappe. In the garnetiferous metasedimentary rocks, quartz inclusions in garnet preserve the P–T conditions of three distinct garnet growth stages corresponding to three metamorphic stages Ms1 to Ms3, including prograde and peak metamorphic conditions. Ms1 and Ms2 stages were constrained via quartz inclusions in garnet core and mantle. They are relatively close in the P–T space and could be considered as one single continuous prograde event occurring at epidote–amphibolite facies conditions of 460–520°C and 0.6–0.85 GPa. The growth of the garnet outermost rim defines the Ms3 stage at amphibolite facies conditions of 590–610°C and 1.13–1.18 GPa and corresponds to the peak metamorphic conditions. The microstructural analysis shows that the finite ductile strain pattern of the Lower Seve Nappe results from the superposition of four deformation phases. The initial phase D1 is defined by the S1 foliation that is still preserved as a curved inclusion trail in the garnet core. The D2 phase initiated contemporaneously with garnet core growth and the development of muscovite–biotite–plagioclase S2 foliation. Garnet outermost rim growth marks the end of the prograde path and peak metamorphic conditions. This stage is overprinted by the D3 phase and Ms4 stage associated with the development of the main regional metamorphic and mylonitic fabric S3 associated with C′‐type shear bands along the retrograde path. Ms4 stage, which was constrained using traditional thermobarometric techniques, corresponds to the chemical re‐equilibration of the metasedimentary minerals and occurred under amphibolite facies conditions at ~570–610°C and 0.78–1.00 GPa. The D3 phase is then generally weakly to strongly overprinted by later lower grade deformation D4 phase at greenschist facies conditions (Ms5). 40Ar/39Ar ages of syn‐kinematic white mica and biotite indicate that the final stage of the thrusting of the Lower Seve Nappe and thus the timing of its emplacement onto the Offerdal Nappe occurred at c. 423 Ma. Collectively, these results are consistent with previous estimates of the timing and conditions of metamorphism derived from the Lower Seve Nappe especially in west‐central Jämtland. However, application of QuiG–TiQ therm...

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Pre-collisional extension of microcontinental terranes by a subduction pulley

Cited by 18 publications

References 61 publications

Seismic Structure of the Caroline Plateau‐Yap Trench Collision Zone

Seismic Structure of the Caroline Plateau‐Yap Trench Collision Zone

Paleoproterozoic Plate Tectonics Recorded in the Northern Margin Orogen, North China Craton

Deciphering the tectonometamorphic history of subducted metapelites using quartz‐in‐garnet and Ti‐in‐quartz (QuiG–TiQ) geothermobarometry—A key for understanding burial in the Scandinavian Caledonides

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