Discovery of the Silurian High Pressure Pelitic Gneiss in Southern Margin of Middle Altyn and its Tectonic Geological Significance

Ma, Tingli; Gai, Yongsheng; Liu, Liang

doi:10.46427/gold2020.1688

Cited by 3 publications

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“…The Si isopleths (X Si = 3.44) in phengite provide a lower pressure constraint of 23.2 kbar, which matches the conditions inferred for the surrounding eclogite‐facies granitic gneiss ( P > 23.2–25.1 kbar) (Ma et al, 2018).…”

Section: Metamorphic Stages and P–t Evolutionsupporting

confidence: 67%

“…Metamorphic facies and metamorphic facies series are from Spear (1993) and O'Brien and Rtzler (2003). The provenance of each P – T path has been marked in the figure, including eclogite‐facies granitic gneiss in the Younusisayi from Ma et al (2018), eclogite in Danshuiquan from Gai (2018) and Gai et al (2021), HP pelite granulite in Munabulake from Cao et al (2013), UHP eclogites in Jianggalesayi from Liu et al (2012), Pelitic gneisses in Jianggalesayi from Liu et al (2007), UHP felsic granulite in Yinggelisayi from Dong, Wei, Clarke, and Zhang (2018), and UHT mafic granulites in Yinggelisayi from Dong et al (2019, 2020) [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Discussionmentioning

confidence: 99%

“…The South Altyn HP/UHP belt is composed predominantly of UHP eclogites (Liu, Yang, et al, 2009; Liu, Wang, Chen, Zhang, & Liou, 2009; Liu et al, 2012), locally containing coesite (Gai et al, 2017) and stishovite pseudomorphs or paramorphs (Liu, Zhang, Green, et al, 2007, Liu et al, 2018), pelitic kyanite–garnet gneiss (Cao et al, 2009, 2013; Gai et al, 2021; Liu, Zhang, Green, et al, 2007), granitic gneiss (Ma et al, 2018; Zhu, Cao, Liu, Wang, & Chen, 2014), and HP–UHP magnesite‐bearing garnet peridotite and K‐feldspar‐bearing garnet clinopyroxenite (Liu et al, 2002, 2005; Wang, Liu, Chen, & Cao, 2011; Zhang et al, 2005; Zhang, Yu, Meng, & Li, 2009). The protolith of these HP–UHP metamorphic rocks formed at 950–700 Ma (Liu, Zhang, Chen, et al, 2007, 2012; Wang, Liu, Chen, & Cao, 2011; Wang et al, 2013).…”

Section: Geological Setting and Sample Locationmentioning

confidence: 99%

“…The Ph‐bearing eclogite (17A‐91) and garnet pyroxenite (16A‐70) investigated here occur as lenses oriented parallel to the regional foliation within the granitic gneiss country rocks (Figure 2a–d); both rocks are retrograde eclogites, but the latter underwent retrograde metamorphism at greater depth than the former. The country rock (Figure 2d) of garnet pyroxenite experienced eclogite‐facies metamorphism (Ma et al, 2018). More detailed observation revealed that the samples are relatively fresh in the core of the lenses, where they generally preserve higher‐grade metamorphic mineral assemblages including eclogite‐facies parageneses.…”

Section: Geological Setting and Sample Locationmentioning

confidence: 99%

“…(c) sample 17A‐91 occurs as lenses in granitic gneiss. (d) Sample 16A‐70 occurs as lenses in eclogite‐facies granitic gneiss (Ma et al, 2018) [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Geological Setting and Sample Locationmentioning

confidence: 99%

See 4 more Smart Citations

Multistage metamorphism of eclogite in the South Altyn HP–UHP belt, Northwest China: Deep subduction and exhumation process of continental crust

Liu

Gai

et al. 2021

Journal Metamorphic Geology

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Two types of retrograded eclogite (phengite‐bearing eclogite and garnet pyroxenite) within eclogite‐facies granitic gneisses are reported for the first time from the Younusisayi area of the South Altyn high to ultrahigh pressure (HP–UHP) metamorphic belt. These eclogites were studied using petrology, mineral chemistry, phase equilibrium modelling, and geochronology. The phengite‐bearing eclogite records five stages of metamorphism: (1) early prograde (Grt + Cpx + Amp + Rt + Qz) at conditions of P = 11.50–17.5 kbar, T = 665–740°C; (2) peak eclogite‐facies (Grt + Omp + Ph + Rt + Qz) at conditions of P > 24.2 kbar, T = 710–1000°C; (3) overprinting during retrograde transition to HP granulite‐facies conditions (Grt + Cpx ± Kfs + Pl + Rt + Qz) at P = 12.1–16.9 kbar and T = 760–890°C; (4) retrogression at granulite‐facies conditions (Grt + Cpx + Amp + Pl + Ilm + Qz) of P = 9.1–11.4 kbar, T = 730–840°C; and (5) amphibolite‐facies metamorphism (Amp + Pl + Ilm + Qz) during cooling and decompression. The garnet pyroxenite records four stages of metamorphism: (1) eclogite‐facies at conditions of P > 23.2 kbar, T = 775–965°C; (2) HP granulite‐facies conditions of P = 13.2–17.8 kbar and T = 836–912°C; (3) granulite‐facies conditions of P = 8.6–9.7 kbar, T = 739–783°C; and (4) amphibolite‐facies metamorphism. Zircon U–Pb dating and trace element analysis constrain eclogite‐facies metamorphism to c. 500 Ma, consistent with the age of the surrounding eclogite‐facies granitic gneiss (497.8 ± 2.7 Ma). Retrograde metamorphism ages of c. 460 Ma are interpreted as recording zircon growth after granulite‐facies metamorphism. The P–T–t path defines the integrated process of deep subduction and multistage exhumation and places constraints on the early Palaeozoic geodynamics of the South Altyn belt. Well‐preserved major and trace element zoning of garnets in the Ph‐bearing eclogites lacks evidence of significant thermal diffusion and may record garnet growth during deep subduction, immediately followed by very rapid exhumation.

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Section: Metamorphic Stages and P–t Evolutionsupporting

confidence: 67%

Section: Discussionmentioning

confidence: 99%

Section: Geological Setting and Sample Locationmentioning

confidence: 99%

Section: Geological Setting and Sample Locationmentioning

confidence: 99%

Section: Geological Setting and Sample Locationmentioning

confidence: 99%

See 3 more Smart Citations

Multistage metamorphism of eclogite in the South Altyn HP–UHP belt, Northwest China: Deep subduction and exhumation process of continental crust

Liu

Gai

et al. 2021

Journal Metamorphic Geology

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Detrital zircon geochronology of Jurassic strata in the Jianggalesayi–Washixia Basin, northwestern Tibet Plateau: Implications for the uplift history of the Altyn Tagh Orogen

et al. 2023

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Jurassic terrestrial sediments of the Jianggalesayi–Washixia Basin in the northwestern Altyn Tagh Orogen record abundant information regarding the evolution and uplift of the orogen. Investigation of this orogen is critical to establishing whether the Tarim and Qaidam basins were connected during the Jurassic. In this study, we present 474 single‐grain laser‐ablation–inductively coupled plasma–mass spectrometry detrital zircon U–Pb ages obtained from five Jurassic sandstone samples collected from four sections in the basin. Detrital zircons from the Lower Jurassic strata yield age populations of 997–726 and 551–509 Ma, indicating that the zircons were derived mainly from the southern–central Central Altyn Tagh Massif. Zircon age populations from the lower Middle Jurassic strata are 1024–838, 778–643, and 543–357 Ma, which suggest that the sediments were derived predominantly from the northern Central Altyn Tagh Massif and the southern South Altyn Tagh subduction–collision complex belt (SATSB). Zircon age populations from the upper Middle Jurassic strata are 980–830, 556–424, and 277–245, suggesting that these sediments were derived from the central SATSB. Detrital zircons from the Upper Jurassic strata display age groups of 515–387 and 325–226 Ma, indicating that these sediments originated from the northern SATSB. Uplift of the Altyn Tagh Orogen was initiated during the Middle to Late Triassic as a synchronous far‐field response to the collision of the Qiangtang Block with the Eurasian Plate. By the Early Jurassic, the Qaidam Basin was no longer connected with the Tarim Basin. During the Late Jurassic to Early Cretaceous, the collision of the Lhasa Block with the southern margin of the Eurasia Plate led to further uplift of the Altyn Tagh Orogen.

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Middle-Late Jurassic chronology and source-to-sink system of the Sikeshu section in the southern margin of the Junggar Basin, Xinjiang

Jiang¹

2022

AETR

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With the improvement of isotopic testing technology, high-precision dating methods such as SHRIMP or LA-ICP-MS of detrital zircon have been used to analyze and infer the formation age of sedimentary basins, the source of detrital materials, and the tectonic background of the formation and widely used. The LA-ICP-MS zircon U-Pb dating method was used to study the detrital zircon in the Middle-Late Jurassic sandstone in the Sikeshu section of the southern margin of the Junggar Basin, Xinjiang. The results show that the detrital zircon ages are mainly 270~447Ma,240~440Ma,245~432Ma, and 286~360Ma. There are also several ancient zircon ages, mainly 945~1080Ma. Combined with zircon mineralogical characteristics, CL images, Th/U ratio, sandstone petrographic characteristics, and regional chronological data, the primary provenance of the Middle-Late Jurassic sandstone is mainly from the Yilinghabilga Mountains in the North Tianshan, and Carboniferous-Permian volcanic rocks, pyroclastic rocks and Carboniferous granites exposed in the Borokonu Mountains of the Central Tianshan Mountains. By comparing the age changes between the four sampling points, the change process of the North Tianshan-Middle Tianshan source-sink system is obtained. From west to east, the upper Devonian glutamate, the Middle Devonian carbonate, and the large granite bodies of the Carboniferous series constituted the early watershed. From the middle to late period of the Toutunhe Formation to the Xishanyao Formation, from east to west, the Cambrian and Silurian carbonate rocks and the large granites and other rocks formed the late water line.

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Discovery of the Silurian High Pressure Pelitic Gneiss in Southern Margin of Middle Altyn and its Tectonic Geological Significance

Cited by 3 publications

References 0 publications

Multistage metamorphism of eclogite in the South Altyn HP–UHP belt, Northwest China: Deep subduction and exhumation process of continental crust

Multistage metamorphism of eclogite in the South Altyn HP–UHP belt, Northwest China: Deep subduction and exhumation process of continental crust

Detrital zircon geochronology of Jurassic strata in the Jianggalesayi–Washixia Basin, northwestern Tibet Plateau: Implications for the uplift history of the Altyn Tagh Orogen

Middle-Late Jurassic chronology and source-to-sink system of the Sikeshu section in the southern margin of the Junggar Basin, Xinjiang

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