Geochronological evidence of Indosinian (high-pressure) metamorphic event and its tectonic significance in Taxkorgan area of the Western Kunlun Mountains, NW China

Yang, Wei; Liu, Liang; Cao, Yuting; Wang, Chao; He, Shunping; Li, Rongshe; Zhu, Xinming

doi:10.1007/s11430-010-4081-1

Cited by 45 publications

(55 citation statements)

References 17 publications

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“…Further, Schwab et al [2004] interpreted the cores of the Central Pamir gneiss domes (terrane Vc) to representing subducted and underplated Carboniferous‐Triassic metasediments (rather than Proterozoic to Early Paleozoic basement). However, zircon results from Yang et al [2010] yield an Ordovician maximum depositional age for metasediments in the footwall of the Shen‐ti fault. Finally, zircon results from Yang et al [2010] and Zhang et al [2007a] yield a Late Permian‐Early Triassic maximum depositional age for the hanging wall of the Torbashi thrust (terrane VII).…”

Section: Geologic Settingmentioning

confidence: 98%

“…The east‐west striking, south dipping Torbashi fault lies immediately south of the southern Shen‐Ti fault juxtaposing amphibolite facies migmatitic schists (terrane VII) above terrane VI. High grade metamorphism is dated as Late Triassic (∼220 Ma) [ Yang et al , 2010]. Kinematic indicators in the hanging wall and footwall show top‐southwest to top‐west sense of shear with cooling ages recording a poorly defined Cretaceous exhumation event interpreted to constrain the timing of thrusting [ Robinson et al , 2007].…”

Section: Geologic Settingmentioning

confidence: 99%

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Detrital zircon and isotopic constraints on the crustal architecture and tectonic evolution of the northeastern Pamir

Robinson¹,

Ducea²,

Lapen³

2012

Tectonics

142

205

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[1] New detrital zircon and isotopic (Nd and Sr) analyses from the eastern Pamir provide information on the depositional age and tectonic terrane affiliation of regional metamorphic terranes. Our results show the following. First, detrital zircon analyses from metasedimentary units along the Kongur Shan extensional system dominantly yield Triassic maximum depositional ages, with a similar age distribution to the Tibetan Songpan-Ganzi terrane. Further, zircon analyses from quartzofeldspathic gneisses in the core of the Muztaghata massif show the protoliths are Triassic granites. These units are interpreted to be part of the Permian-Triassic Karakul-Mazar arc-accretionary complex terrane. Second, ɛNd (0) compositions of Triassic granites overlap with other metasedimentary units not analyzed for detrital zircons and are also interpreted to be part of the Karakul-Mazar terrane. Third, schists in the Sares-Muztaghata gneiss dome structurally above Triassic orthogneisses yield an Ordovician maximum depositional age with a distinct detrital age distribution similar to the Tibetan Qiangtang terrane and are interpreted to be part of the Central Pamir terrane. Finally, Triassic and Ordovician schists along the Muztaghata massif record an Early Jurassic metamorphic event interpreted to date south-directed subduction of the Karakul-Mazar terrane beneath the Central Pamir during final closure of the Paleo-Tethys. These results, integrated with previously published results and field relations, reveal a complex Mesozoic to Cenozoic interleaving of tectonic terranes in the eastern Pamir with emplacement of the Karakul Mazar terrane both above and below the Kunlun and Central Pamir terranes to the north and south, respectively.Citation: Robinson, A. C., M. Ducea, and T. J. Lapen (2012), Detrital zircon and isotopic constraints on the crustal architecture and tectonic evolution of the northeastern Pamir, Tectonics, 31, TC2016,

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Section: Geologic Settingmentioning

confidence: 98%

Section: Geologic Settingmentioning

confidence: 99%

Detrital zircon and isotopic constraints on the crustal architecture and tectonic evolution of the northeastern Pamir

Robinson¹,

Ducea²,

Lapen³

2012

Tectonics

142

205

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“…253-220 Ma and resulted in the final collision of the West Kunlun and Karakorum-Qiangtang blocks (Yang et al 2010). Voluminous granitoids and MEs are preserved within the West Kunlun-a large accretionary orogen between the south margin of the Tarim Block and the western extension of the Himalayan-Tibetan orogen (Fig.…”

Section: Regional Geologymentioning

confidence: 99%

“…There is little debate that this zone represents a subduction-collision complex. Recently published U-Pb zircon age data suggest that these high-pressure (HP) granulites underwent peak metamorphism from 253 ± 2 to 220 ± 2 Ma (Yang et al 2010). To the south, the Taxkogan-Tianshuihai terrane is bordered by the Karakorum-Qiangtang terrane.…”

Section: Regional Geologymentioning

confidence: 99%

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Origins of Early Mesozoic granitoids and their enclaves from West Kunlun, NW China: implications for evolving magmatism related to closure of the Paleo-Tethys ocean

Wang

Liu

Korhonen

et al. 2015

Int J Earth Sci (Geol Rundsch)

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the melting of a source at middle crustal depths. The AP host and its enclaves from the southeastern part of the West Kunlun have low Rb, Rb/Sr (0.15-1.90) and weakly negative Eu anomalies but high HREE contents indicating limited fractionation of plagioclase without residual garnet in their source. The inferred protolith is an intermediate igneous rock in the middle or lower crust. MEs hosted in the AP have high Mg# (39.7-45.0) and Nb and weakly negative Eu anomalies, as well as high Sr, P and Ti, corresponding to a medium-K basaltic rock, which may have originated from mixing of partial melting of metasomatised mantle wedge that has been modified by upwelling asthenospheric mantle and crustal melting in the deep source. Post-collisional southeasternward younging of Mesozoic granitoids in the West Kunlun records a transition from shallow level, mid-crustal melting to deeper level, lower-crustal melting. The post-collisional granitoids show significant mantle input increasing from northwest to southeast, which was closely associated with mafic magma-driven partial melting of mantle and crustal sources as a consequence of slab break-off. Syn-to post-collisional Early Mesozoic granites emplaced along the Mazar-Kangxiwar suture zone suggest that these tectonomagmatic processes followed the closure of the Paleo-Tethys ocean during the Tarim and Karakorum-Qiangtang continental collision.

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Building the Pamir-Tibetan Plateau-Crustal stacking, extensional collapse, and lateral extrusion in the Central Pamir: 2. Timing and rates

et al. 2017

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Geothermochronologic data outline the temperature‐deformation‐time evolution of the Muskol and Shatput gneiss domes and their hanging walls in the Central Pamir. Prograde metamorphism started before ~35 Ma and peaked at ~23–20 Ma, reflecting top‐to‐ ~N thrust‐sheet and fold‐nappe emplacement that tripled the thickness of the upper ~7–10 km of the Asian crust. Multimethod thermochronology traces cooling through ~700–100°C between ~22 and 12 Ma due to exhumation along dome‐bounding normal‐sense shear zones. Synkinematic minerals date normal sense shear‐zone deformation at ~22–17 Ma. Age‐versus‐elevation relationships and paleoisotherm spacing imply exhumation at ≥3 km/Myr. South of the domes, Mesozoic granitoids record slow cooling and/or constant temperature throughout the Paleogene and enhanced cooling (7–31°C/Myr) starting between ~23 and 12 Ma and continuing today. Integrating the Central Pamir data with those of the East (Chinese) Pamir Kongur Shan and Muztaghata domes, and with the South Pamir Shakhdara dome, implies (i) regionally distributed, Paleogene crustal thickening; (ii) Pamir‐wide gravitational collapse of thickened crust starting at ~23–21 Ma during ongoing India‐Asia convergence; and (iii) termination of doming and resumption of shortening following northward propagating underthrusting of the Indian cratonic lithosphere at ≥12 Ma. Westward lateral extrusion of Pamir Plateau crust into the Hindu Kush and the Tajik depression accompanied all stages. Deep‐seated processes, e.g., slab breakoff, crustal foundering, and underthrusting of buoyant lithosphere, governed transitional phases in the Pamir, and likely the Tibet crust.

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Geochronological evidence of Indosinian (high-pressure) metamorphic event and its tectonic significance in Taxkorgan area of the Western Kunlun Mountains, NW China

Cited by 45 publications

References 17 publications

Detrital zircon and isotopic constraints on the crustal architecture and tectonic evolution of the northeastern Pamir

Detrital zircon and isotopic constraints on the crustal architecture and tectonic evolution of the northeastern Pamir

Origins of Early Mesozoic granitoids and their enclaves from West Kunlun, NW China: implications for evolving magmatism related to closure of the Paleo-Tethys ocean

Building the Pamir-Tibetan Plateau-Crustal stacking, extensional collapse, and lateral extrusion in the Central Pamir: 2. Timing and rates

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