Polyphase deformation of staurolite-bearing metapelite in the Chinese Altai: Recording a Devonian-Permian tectonic regime switch in the southwestern Central Asian Orogenic Belt

Miao, Yazhou; Zhang, Jian; Schulmann, Karel; Lexa, Ondrej; Jeřábek, Petr; Sun, Min; Jiang, Yingde; Zhang, Shuhui

doi:10.1016/j.jsg.2023.104917

Cited by 3 publications

(2 citation statements)

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“…270-250 Ma (Guadalupian to Lopingian), also affected the Chinese Altai and reworked precisely dated pegmatite dyke swarms (Jiang et al, 2019;Miao, Zhang, Schulmann, Lexa, et al, 2023;Shu et al, 2022). The D 2 deformation led to the reorientation of the late Devonian to early Carboniferous upright folds into a WNW-ESE direction along the whole southern margin of the Chinese Altai (Kong et al, 2022;Miao, Zhang, Schulmann, Lexa, et al, 2023;Xu et al, 2021). This deformation is also related to the extrusion of granulite-facies rocks and migmatites in core Tectonics 10.1029/2024TC008254 of large antiforms (Broussolle et al, 2018).…”

Section: Middle To Late Permian Collisional Deformation Of the East J...mentioning

confidence: 99%

“…The deformation, which occurred in the Permian at ca. 270-250 Ma (Guadalupian to Lopingian), also affected the Chinese Altai and reworked precisely dated pegmatite dyke swarms (Jiang et al, 2019;Miao, Zhang, Schulmann, Lexa, et al, 2023;Shu et al, 2022). The D 2 deformation led to the reorientation of the late Devonian to early Carboniferous upright folds into a WNW-ESE direction along the whole southern margin of the Chinese Altai (Kong et al, 2022;Miao, Zhang, Schulmann, Lexa, et al, 2023;Xu et al, 2021).…”

Section: Middle To Late Permian Collisional Deformation Of the East J...mentioning

confidence: 99%

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Switching From Subduction Zone Advance to Retreat Explains the Late Paleozoic Evolution of the East Junggar System, Central Asian Orogenic Belt

Miao,

Zhang,

Schulmann

et al. 2024

Tectonics

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The geodynamic evolution of the East Junggar is examined by means of satellite imaging and field‐based structural studies, U‐Pb zircon geochronology and analysis of potential field geophysical data in the Yemaquan arc and the Dulate back‐arc systems. The northern Yemaquan arc shows a pervasive WNW–ESE steep S1 foliation that is related to the exhumation of Armantai ophiolitic mélange in an F1 antiformal structure. The bedding of the Dulate sequences is folded by N–S‐trending F1 upright folds that are preserved in low strain domains. The timing of D1 is estimated between 310 and 280 Ma. During D2, previously folded Dulate sequences were orthogonally refolded by E–W‐trending F2 upright folds, resulting in Type‐1 basin and dome interference pattern and pervasive E–W trending S2 cleavage zones. The age of D2 is constrained to be 270–250 Ma based on the dating of syn‐tectonic pegmatites and deposition of syn‐orogenic sedimentary rocks. The boundary between the Yemaquan arc and Dulate back‐arc basin experienced reactivation through D2 dextral transpressive shear zones. The D1 fabrics are the consequence of the closure of the Dulate back‐arc basin due to the advancing mode of Kalamaili subduction. Almost orthogonal Permian D2 fabrics were generated by the N–S shortening of the East Junggar and the northward movement of the Junggar Block indenter. This D2 deformation was associated with the anticlockwise rotation of the southern limb of the Mongolian Orocline, the scissor‐like closure of the northerly Mongol‐Okhotsk Ocean and the collision of the Mongolian and the Tarim–North China craton collages.

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Section: Middle To Late Permian Collisional Deformation Of the East J...mentioning

confidence: 99%

Section: Middle To Late Permian Collisional Deformation Of the East J...mentioning

confidence: 99%

Switching From Subduction Zone Advance to Retreat Explains the Late Paleozoic Evolution of the East Junggar System, Central Asian Orogenic Belt

Miao,

Zhang,

Schulmann

et al. 2024

Tectonics

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Carboniferous Barrovian to Permian Buchan‐type metamorphic cycles in the Mongolian Altai Zone: Implication for pressure cycles in accretionary orogens

Aguilar,

Štípská,

Schulmann

et al. 2024

Journal Metamorphic Geology

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In the Altai Accretionary Wedge, several periods of Barrovian‐ and Buchan‐type metamorphic cycles were dated from Ordovician to Permian. However, the timing and link between these cycles are not clear, and their causes are debated. In order to contribute to the understanding of Barrovian‐ to Buchan‐type evolution of the accretionary wedges, we studied an area composed of three parallel belts in the easternmost extremity of the Hovd domain located in Mongolian Altai Zone: garnet gneiss in the north, garnet–staurolite–kyanite schist overprinted by ±sillimanite±cordierite±andalusite‐bearing assemblages in the centre and garnet–sillimanite gneiss in the south. Petrography, garnet zoning and thermodynamic modelling indicate that the garnet gneiss from the northern belt records burial from ~510°C and ~3–4 kbar to ~600°C and ~5 kbar, followed by heating to ~660°C and decompression to ~4.5 kbar. The garnet–staurolite–kyanite schist from the central belt records burial from ~550°C and ~3–4.5 kbar to ~640–680°C and ~7 kbar, followed by decompression to the sillimanite stability field at ~650°C and ~6 kbar. Crystallization of cordierite, andalusite, late muscovite and chlorite in some samples indicates cooling on decompression to ~540°C and ~3.5 kbar. In the southern gneiss belt, the garnet–sillimanite gneiss with almost unzoned garnet suggests re‐equilibration at ~6 kbar and ~710°C. In situ U–Pb monazite and xenotime dating carried out inclusions in porphyroblasts and matrix grains revealed Carboniferous and Permian ages. The monazite and xenotime from gneisses of the northern and southern belts record Carboniferous and Permian ages, which are interpreted as Carboniferous crystallization at c. 347 Ma associated with metamorphic peak, followed by Permian (re)crystallization at c. 300 and 283 Ma. In the central belt, rare Carboniferous xenotime grains in a garnet–staurolite–kyanite–andalusite–muscovite schist indicate a possible Carboniferous age of the prograde metamorphism. Predominant ages between c. 280 and 260 Ma recorded by monazite are interpreted as a result of complete recrystallization during an LP metamorphic overprint. The Carboniferous ages from the gneisses can be interpreted as constraining the timing of the exhumation of deep crustal rocks to shallow crustal levels. This event corresponds to the formation of crustal‐scale migmatite‐magmatite domes in the Mongolian Altai Zone. The prograde Barrovian assemblages in the central schist belt are interpreted as having formed contemporaneously during burial in a synform between the migmatite‐magmatite domes. The Permian ages reflect LP–HT metamorphism, best recorded by the Buchan‐type assemblages in the central schist belt, and are related to massive heat flux from tectonically mobile deep partially molten crust. Correlation with similar Barrovian‐ and Buchan‐type episodes from the Chinese Altai Zone indicates multiple compressional and extensional events in the upper plate accretionary wedge, probably related to retreating and advancing modes of the subduction zone.

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Genesis and tectonic significance of the Lamazhao granite in the Altai area, Xinjiang, China

WANG,

ZHANG

2024

kwxb

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Polyphase deformation of staurolite-bearing metapelite in the Chinese Altai: Recording a Devonian-Permian tectonic regime switch in the southwestern Central Asian Orogenic Belt

Cited by 3 publications

References 58 publications

Switching From Subduction Zone Advance to Retreat Explains the Late Paleozoic Evolution of the East Junggar System, Central Asian Orogenic Belt

Switching From Subduction Zone Advance to Retreat Explains the Late Paleozoic Evolution of the East Junggar System, Central Asian Orogenic Belt

Carboniferous Barrovian to Permian Buchan‐type metamorphic cycles in the Mongolian Altai Zone: Implication for pressure cycles in accretionary orogens

Genesis and tectonic significance of the Lamazhao granite in the Altai area, Xinjiang, China

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