Geochemistry, zircon U-Pb geochronology and Hf isotopic characteristics for syenogranite and diorite from the western segment of North Altyn

郑坤,; Zheng, Kun; 吴才来,; Wu, Cailai; 魏春景,; Wei, Chunjing; 郜源红,; Gao, Yuanhong; 郭文峰,; Guo, Wei; 陈红杰,; Chen, Hongjie; Wu, Di; 高栋,; Dong, Guochen

doi:10.18654/1000-0569/2019.02.17

Cited by 9 publications

(5 citation statements)

References 26 publications

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“…The basement of the NATT is composed of Archean and Palaeoproterozoic rocks (Figure 1; Long et al, 2014; Lu & Yuan, 2003; Lu et al, 2008; Wang et al, 2015; Zhang et al, 2011; Zhu et al, 2018), and peak magmatic activity in the NATSB occurred between 518 and 405 Ma (Figure 1; Gai et al, 2015; Gao et al, 2011; Han et al, 2012; Kang et al, 2011; Meng et al, 2017; Yu et al, 2017; Zheng et al, 2019). Sporadic Tonian bimodal magmatic rocks have been found in the NATSB, with a peak age of 774 Ma (Figure 1; Liu, Wang, Cao, Chen, et al, 2012, Liu, Wang, Cao, Luo, et al, 2012; Yang et al, 2014; Zhao et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

“…Tectonic units: North Altyn Tagh terrane (NATT) and the north Altyn Tagh subduction-collision complex belt (NATSB) in the north, the central Altyn Tagh Massif (CATM) in the Centre, and the south Altyn Tagh subduction-collision complex belt (SATSB) in the southwest. Zircon U-Pb ages are from (1) Gehrels et al, 2003a; (2) Zhang et al, 2011; (3) Wang et al, 2006Wang et al, , 2013Wang et al, , 2014(4) Kang et al, 2013, Kang et al, 2016(5) Cao et al, 2010;(6) Yang et al, 2012;(7) Sun et al, 2012;(8) GDCAPF, 2019;(9) Cowgill et al, 2003;(10) Zhang et al, 2010;(11) RGXR, 2009;(12) Liu, Wang, Cao, Chen, et al, 2012, Liu, Wang, Cao, Luo, et al, 2012(13) Hao et al, 2020;(14) Gai et al, 2015;(15) Li et al, 2001;(16) Lu & Yuan, 2003, Lu et al, 2008(17) Long et al, 2014;(18) (19) Han et al, 2012;(20) Zheng et al, 2019;(21) Jolivet et al, 2001;and (22) Li et al, 2002. The red rectangle marks the position of Figure 2 F I G U R E 3 Logs of measured stratigraphic sections of Jurassic sedimentary rocks in the Jianggalesayi-Washixia Basin, showing the locations of the analysed samples Stratigraphic and sedimentary analytical, isotopic chronological, and thermochronological studies have revealed various ...…”

Section: Altyn Tagh Orogenmentioning

confidence: 99%

“…The rocks exposed in the NATSB are composed of early Palaeozoic Hongliugou ophiolite, pelagic clastic rocks, carbonates, high‐pressure metamorphic rocks, and granite (Liu et al, 2009; Wang et al, 2013). Geochemical analyses show that granitic magmas in the NATSB evolved from pre‐collisional series (520–500 Ma) to syn‐collisional series (490–470 Ma) to post‐collisional series (440–410 Ma) (Gai et al, 2015; Han et al, 2012; Zheng et al, 2019).…”

Section: Geological Settingmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Altyn Tagh Orogenmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

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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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“…The Dunhuang block is also characterized by the occurrence of numerous Palaeozoic magmatic and metamorphic rocks. Magmatic rocks consist of early and late Palaeozoic granitoids formed at c. 510, c. 465–410 and c. 370–335 Ma (Gan et al, 2020; Wang et al, 2016a, 2016b; Zhang et al, 2009; Zhao et al, 2017; Zhao, Diwu, Zhu, et al, 2015). Volcanoclastic rocks deposited at 424–414 Ma and dacitic porphyries emplaced at c. 364 Ma represent further evidence of Palaeozoic magmatism (Shi et al, 2020).…”

Section: Geological Settingmentioning

confidence: 99%

“…However, the occurrence of middle Cambrian arc granitoids (Gan et al, 2020) and arc magmatic belts from c. 462 to 360 Ma (e.g. Shi et al, 2020;Wang et al, 2016aWang et al, , 2016bZhao et al, 2017;Zhu et al, 2020) indicates that the Dunhuang block underwent a long-lasting supra-subduction evolution. For researchers who advocate the Alpine-type mélange affinity of the Dunhuang block, the HP metabasites were considered to originate from the subducting slab of the Paleo-Asian or Paleo-Tethys oceans in the middle Ordovician to late Silurian (e.g.…”

Section: Introductionmentioning

confidence: 99%

Devonian Andean‐type convergence in the southern Dunhuang block (NW China): Petro‐structural, metamorphic P–T and geochronological constraints

Soldner,

Jiang,

Štípská

et al. 2024

Journal Metamorphic Geology

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Archean to Palaeoproterozoic basement rocks exposed in the Dunhuang block in NW China were affected by Palaeozoic crustal reworking, as constrained by previous zircon U–Pb geochronological investigations. However, relationships between the Palaeozoic metamorphic ages, P–T evolution and deformational history of the region remain ambiguous. In order to address this issue, P–T–t–D paths of paragneisses from the basement of the Hongliuxia belt in the southern Dunhuang block were investigated. Inclusions in garnet and kyanite from the paragneisses are considered as vestiges of Palaeozoic M1 metamorphism corresponding to initiation of the prograde evolution. The earliest continuous metamorphic fabric is an originally steep N–S striking foliation S2. This fabric was reworked by vertical folds F3 associated with the development of a ubiquitous steep, mainly south‐dipping, E‐W striking axial planar foliation S3. The S2 foliation in paragneisses is mainly associated with Grt–St–Ky–Sil–Bt–Ms–Pl–Qz–Rt assemblages in samples from the western domain and with Grt–Ky–Sil–Bt–Kfs–Pl–Qz–Rt assemblages in samples from the northeastern domain of the Hongliuxia belt. The S3 foliation is associated with Grt–Sil–St–Bt–Ms–Pl–Qz–Ilm assemblages in the western domain and with Grt–Sil–Bt–Ms–Pl–Qz–Kfs–Ilm assemblages in the northeastern domain, followed by growth of chlorite in both domains. Early prograde stage (M1) from 4.0–6.5 kbar and 540–560°C to metamorphic peak (M2a) at 9–10 kbar and ~650–675°C is mainly recorded by paragneisses from the western domain. Subsequent decompression is initially accompanied by heating (M2b) constrained to 6.5–7 kbar and 675–710°C in the western domain, and to 6–6.5 kbar and ~730°C in the northeastern domain, followed by cooling (M3) through 4–6.5 kbar and 550–650°C till late chloritization (late M3). In situ U–Pb dating of monazite combined with monazite trace‐element compositions suggests that prograde evolution (M1) most likely started at c. 406 Ma, peak‐P conditions (M2a) were reached at 400–394 Ma, decompression associated with heating (M2b) took place at 393–391 Ma, and cooling (M3) during exhumation probably lasted from 380 to 354 Ma. The prograde metamorphism probably reflects burial during underthrusting of neighbouring continental basement (the Alxa block or an equivalent) below the Dunhuang block. This event culminated in pure shear thickening (D2a) of the whole supra‐subduction margin followed by minor heating and exhumation (D2b). The D3‐M3 event is interpreted as reflecting exhumation during orthogonal shortening of the system, possibly in response to an independent orogenic cycle. Combined with the available regional data, this study reveals the existence of a complex tectono‐metamorphic evolution for the Dunhuang block characterized by two distinct orogenic phases with (i) the thickening of a previously thinned arc‐back‐arc crust recorded in the northern and central belts at 420–410 Ma in the pro‐wedge side of the active margin (Sanweishan phase), followed by (ii) the 410–390 Ma thickening in the retro‐wedge side (Hongliuxia phase). Such a tectonic evolution of the whole Dunhuang block resembles Andean‐type migration of crustal thickening from the convergent front to hinterlands. The D3‐M3 event, potentially responsible for the juxtaposition of rocks from different geological occurrences and depths, is seemingly independent from this Andean‐type orogenic cycle.

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Central China Orogenic Belt and amalgamation of East Asian continents

et al. 2021

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Geochemistry, zircon U-Pb geochronology and Hf isotopic characteristics for syenogranite and diorite from the western segment of North Altyn

Cited by 9 publications

References 26 publications

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

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

Devonian Andean‐type convergence in the southern Dunhuang block (NW China): Petro‐structural, metamorphic P–T and geochronological constraints

Central China Orogenic Belt and amalgamation of East Asian continents

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