Magmatic recycling of accretionary wedge: A new perspective on Silurian-Devonian I-type granitoids generation in the Chinese Altai

Huang, Yanqiong; Jiang, Yingde; Collett, Stephen; Wang, Sheng; Xu, Kang; Shu, Tan; Li, Pengfei; Yuan, Chao

doi:10.1016/j.gr.2019.07.019

Cited by 21 publications

(6 citation statements)

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“…An important part of the system is represented by a Cambro‐Ordovician volcano‐sedimentary unit called the Altai accretionary wedge, extending for more than 2500 km from eastern Kazakhstan via Russia, through north‐west China to Mongolia (Figure 1; Jiang et al, 2017). The Altai accretionary wedge was reworked during a Devono‐Carboniferous orogenesis that led to significant crustal anatexis and magmatism culminating at 400–380 Ma (Broussolle et al, 2019; Cai et al, 2011; Hanžl et al, 2016; Huang et al, 2020; Jiang et al, 2016; Wang et al, 2006; Yuan et al, 2007).…”

Section: Geological Frameworkmentioning

confidence: 99%

“…The Altai accretionary wedge recorded polyphase Palaeozoic deformation, metamorphic and magmatic events leading to transformation of an immature sedimentary wedge into a mature orogenic crust (Huang et al, 2020; Jiang et al, 2016). The main orogenic event in the Chinese Altai is recorded in a subhorizontally foliated deep migmatite‐granite unit (e.g.…”

Section: Geological Frameworkmentioning

confidence: 99%

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Barrovian and Buchan metamorphic series in the Chinese Altai:P–T–t–D evolution and tectonic implications

Jiang

Štípská

Schulmann

et al. 2021

Journal Metamorphic Geology

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The relations between Barrovian-and Buchan-type metamorphic series in the Chinese Altai remain obscure, and hence a representative region of the central part of the Chinese Altai was investigated to address this issue, using combined microstructural, petrological and geochronological methods. In the region, Barrovian-type garnet, staurolite, kyanite and sillimanite zones are locally overprinted by Buchan-type andalusite-and cordierite-bearing domains. Microstructural analysis shows that Barrovian garnet, staurolite and kyanite grew synchronously with the earliest regional metamorphic foliation S1 B . A sillimanite-bearing assemblage locally overprinted the assemblage of the staurolite zone in a foliation parallel with S1 B , assigned as S1 M . The originally subhorizontal S1 B-M foliation, metamorphic zones and mineral isograds were folded by F2 upright folds, leading to their inclination and juxtaposition to upper crustal levels. Subsequent D3 deformation affected heterogeneously all previous structures producing vertical high-strain zones around low-strain domains. The D3 high-strain zones in the vicinity of Permian pegmatites are associated with Buchan-type metamorphism and are characterized by syn-D3 growth of andalusite and cordierite. Phase equilibria modelling of the staurolite/kyanite-bearing assemblages suggests a prograde P-T path with an apparent thermal gradient of $23 C/km associated with the S1 B fabric. The partial re-equilibration occurred in the sillimanite stability at $670 C, corresponding to an apparent thermal gradient of $34 C/km in the S1 M fabric. Garnet to sillimanite metamorphic zones were subsequently exhumed without apparent re-equilibration during the D2 event. The interpreted pressure-temperature (P-T) evolution of the Buchan-type metamorphism on the basis of thermobarometry and phase equilibria modelling suggests significant heating processes, corresponding to apparent thermal gradient of 41 C/km or more. In situ U-Pb dating of monazite inclusions in staurolite revealed predominantly 280-260 Ma ages and minor older ages scattering between 350 and 290 Ma, interpreted as important monazite recrystallization during the D3 event. Monazite in andalusite and cordierite yielded only ages of 280-260 Ma, interpreted as dating the growth of these minerals. Lu-Hf garnet-whole rock isochron of a

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Section: Geological Frameworkmentioning

confidence: 99%

Section: Geological Frameworkmentioning

confidence: 99%

Barrovian and Buchan metamorphic series in the Chinese Altai:P–T–t–D evolution and tectonic implications

Jiang

Štípská

Schulmann

et al. 2021

Journal Metamorphic Geology

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“…The compositional variability of late Ordovician granitoids and felsic volcanic rocks in the MAW indicates that using geochemical tectonic discrimination diagrams could be misleading, and more probably reflects the variability of the sedimentary and volcano-sedimentary sources themselves derived from the Cambrian-Ordovician arc and the Precambrian basement to the north (e.g., Jiang et al 2016;Huang et al 2020). Comparable observation was made for another early Palaeozoic accretionary system, the Lachlan Orogen in SE Australia (Collins et al 2020).…”

Section: Geotectonic Setting Of the Late Ordovician Magmatismmentioning

confidence: 97%

Late Ordovician magmatic pulse in the Tugrug Group, the Gobi Altai Zone, SW Mongolia

Hanžl,

Uhrová,

Hrdličková

et al. 2024

J. Geosci.

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district, 19 th khoroo, 3 rd building, Ulaanbaatar * Corresponding authorThe Mongolian Altai Domain of the Central Asian Orogenic Belt is formed by a giant Lower Palaeozoic accretionary wedge that was later thrust over the northerly Central Mongolian Microcontinent. This accretionary complex mainly consists of late Cambrian-Ordovician volcano-sedimentary rocks represented by various formations within the Tugrug Group which were deformed, metamorphosed and intruded by numerous plutons during the Devonian-Carboniferous orogenic events. In this work, we report new U-Pb zircon ages of two felsic igneous rocks indicating an existence of the so far neglected late Ordovician magmatic event affecting the Mongolian Altai accretionary wedge. The felsic volcanic sheet inside the upper part of the Tugrug Group in the western Gobi Altai Zone (eastern part of the Mongolian Altai Domain) yields an age of 457 ± 2 Ma and nearby granite pluton intruding the entire volcano-sedimentary sequence gives an age of 445 ± 1 Ma. Both rocks are high-K calc-alkaline, peraluminous, with similar geochemical patterns characterised by enrichment in mobile lithophile elements over Nb, Ti, P and Sr and nearly identical REE trends. All together, these features point to an analogous volcanic-arc-related magma source. This magmatism reflecting terminal stages of the accretionary wedge formation in the Mongolian Altai Domain may be related to the recently proposed late Ordovician orogenic event.

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“…The Silurian-Devonian and Permian-Triassic events responsible for the final architecture of the Chinese Altai have been subjects of many studies in the last decade. The Silurian-Devonian event is characterized by the widespread occurrence of 420-370 Ma granitoids that occupy more than 40% of the map surface of the Chinese Altai (Cai et al, 2011b;Huang et al, 2020;Jiang et al, 2016;Sun et al, 2008;Wang et al, 2006;Yu et al, 2017;Yuan et al, 2007). Magmatism is associated with extensive anatexis and high-temperature metamorphism of fertile sediments (Broussolle et al, 2018;Jiang et al, 2011bJiang et al, , 2015Jiang et al, , 2019Long et al, 2007;Zhang et al, 2015), which led to the transformation of the Altai accretionary wedge into a mature and layered orogenic crust.…”

Section: Regional Geological Backgroundmentioning

confidence: 99%

“…In the Altai, the extension is accompanied by anatexis in the lower orogenic crust (Broussolle et al, 2015;Jiang et al, 2015Jiang et al, , 2019Zhang et al, 2015). In addition, the overlying Devonian sequences contain high-Mg andesites and bimodal volcanic rocks (Cui et al, 2020;Soejono et al, 2018;Wan et al, 2010;Wang et al, 2011) coeval with the intrusion of Circum-Pacific S-type granitoids (Huang et al, 2020;Jiang et al, 2016), emplacement of mafic rocks (Niu et al, 2006;Wong et al, 2010), and development of VMS mineralization (Wan et al, 2010(Wan et al, , 2011. All these phenomena are the hallmark of a significant increase of the heat budget of the entire Altai crust during the Devonian.…”

Section: Devonian Anomalous Heat Input and Heterogeneous Stretching O...mentioning

confidence: 99%

Petrostructural and Geochronological Constraints on Devonian Extension‐Shortening Cycle in the Chinese Altai: Implications for Retreating‐Advancing Subduction

et al. 2022

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Structural and metamorphic effects of a Devonian extension‐shortening cycle in the NW Chinese Altai were investigated using combined structural‐petrological analysis and zircon and monazite U‐Pb geochronology. Structural observations revealed a ubiquitous, sub‐horizontal metamorphic fabric (S1), which was originally sub‐parallel with horizontal bedding (S0) of supracrustal Devonian volcanic‐sedimentary basins. This metamorphic fabric is defined by a sillimanite‐bearing migmatitic gneissosity associated with extensional shear bands and a cordierite‐bearing schistosity in the orogenic lower and middle crust, respectively. Staurolite relics preserved in the S1 fabric are interpreted as relics of older, higher pressure Barrovian‐type metamorphism. These structural‐metamorphic features are correlated with decompression and heating and interpreted as reflecting a crustal‐scale extensional phase. S1 was folded to form N‐S‐oriented upright antiforms cored by migmatites and locally transposed by steep S2 foliation during a ∼W‐E‐directed shortening (in current coordinates). Andalusite and cordierite overgrew the migmatitic S2 foliation attesting to decreasing pressure associated with vertical extrusion of migmatites in cores of F2 antiforms. New U‐Pb age data from subhorizontally foliated migmatites suggest that the D1 extension started at least before ∼410 Ma. Age data of syn‐D2 granite intrusions and dykes constrain the D2 shortening starting soon after D1 extension and ending at ∼378 Ma. Combined with regional data, cycles of extensional and contractional tectonic regimes can be defined, which also show eastward migration along‐strike of the Altai range. Such extension‐shortening cycles could result from alternating retreating and advancing subduction, which governed the evolution of the Altai accretionary system from the Ordovician until the Carboniferous.

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Magmatic recycling of accretionary wedge: A new perspective on Silurian-Devonian I-type granitoids generation in the Chinese Altai

Cited by 21 publications

References 115 publications

Barrovian and Buchan metamorphic series in the Chinese Altai:P–T–t–D evolution and tectonic implications

Barrovian and Buchan metamorphic series in the Chinese Altai:P–T–t–D evolution and tectonic implications

Late Ordovician magmatic pulse in the Tugrug Group, the Gobi Altai Zone, SW Mongolia

Petrostructural and Geochronological Constraints on Devonian Extension‐Shortening Cycle in the Chinese Altai: Implications for Retreating‐Advancing Subduction

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