Triassic granitoids in the East Kunlun Orogenic Belt, Northwestern China: magmatic source and implications for geodynamic evolution

Xu, Zhi-He; Xin, Wei; Zhou, Xiaodong; Xu, Qinglin; Li, Fuwen; Song, Zhaojun

doi:10.1080/00206814.2020.1848647

Cited by 8 publications

(4 citation statements)

References 43 publications

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“…These ndings, combined with spatiotemporal distributions of regional magmatism(Xu et al, 2020;Xue et al, 2020), con rm that late Permian and Early Triassic granites in the western NQTB formed in an active continental marginal environment (Figure13). The late Permian-Early Triassic granites show the characteristics of continental marginal arc granite with an origin of partial melting of Proterozoic crust modi ed by slab-derived uids in the back-arc extension caused by northern subduction of the Kunlun Ocean.…”

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confidence: 63%

Petrogenesis and tectonic setting of late Permian–Early Triassic granitic rocks in the western Qaidam Basin, Qinghai–Tibetan Plateau

Gao,

Wang,

Jiang

2023

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Occurring after the early Palaeozoic collisional orogeny and continental deep subduction, late Palaeozoic tectonic magmatism in the northern Qaidam Tectonic Belt (NQTB) related to the Palaeo-Tethys Ocean has become a critical issue. We performed a detailed geochronological and geochemical study of Lenghu (LH) granitic rocks in the western NQTB to obtain better constraints on the subduction processes of the Palaeo-Tethys Ocean in the northern Qinghai–Tibetan Plateau. LA–ICP–MS U–Pb dating of zircons from LH granitic rocks in the western NQTB yields emplacement ages of 253 ± 4 Ma and 264 ± 4 Ma, indicating a two-stage emplacement process. Geochemical analyses show that both the late Permian and Early Triassic granitic rocks have low A/CNK and A/NK values and are enriched in LILEs (Rb, Th, Ba, Zr, and Hf) and depleted in HFSEs (Sr, P, Ti, Nd, and Ta). The SREE contents range from 36 to 189 ppm, and the samples are enriched in LREEs (LREE/HREE =1.5–7.3). Values of (La/Yb)N range between 0.9 and 6.5, and all samples show negative Eu anomalies (δEu =0.2–0.6), with typical characteristics of island arc magmatism. The two-stage granitic rocks have εHf(t) values of -3.7 to +8.0 and yield a two-stage depleted mantle Hf model age of 1.51-0.78 Ga. The data suggest that the late Permian–Early Triassic granitic rocks were derived from partial melting of Proterozoic crust-related mafic to intermediate rocks with significant crust–mantle interactions. The results, combined with regional magmatic information, indicate that the South Kunlun Oceanic plate might have experienced plate rollback in the late Permian and plate retraction in the Triassic under the Kunlun–Qaidam Block.

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confidence: 63%

Petrogenesis and tectonic setting of late Permian–Early Triassic granitic rocks in the western Qaidam Basin, Qinghai–Tibetan Plateau

Gao,

Wang,

Jiang

2023

Preprint

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“…Abbreviations: syn-COLG = syn-collision granites; VAG = volcanic arc granites; WPG = within plate granites; ORG = ocean ridge granites. Data sources: The data for Regional igneous rocks (P1: 254-246 Ma) were from [1,4]; the data for Regional igneous rocks (P2: 244-232 Ma) were from [1][2][3][4][5]69]; the data for Regional igneous rocks (P3: 230-218Ma) were from [2,9,70].…”

Section: Dhb Porphyritic Dioritesmentioning

confidence: 99%

“…According to the age distribution characteristics of these magmatic activities, combined with the rock combination and rock type of each period, we analyzed the magmatic activities distributed in the Late Permian-Triassic in the study area by integrating geological factors such as strata and structures, and found that the emergence of a large number of magmatic rocks in each peak period may correspond to different dynamic mechanisms and backgrounds. S4, and the strata data modified after [69,73].…”

Section: Tectonic Implicationsmentioning

confidence: 99%

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Petrogenesis and Tectonic Implications of the Triassic Granitoids in the Ela Mountain Area of the East Kunlun Orogenic Belt

et al. 2022

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The East Kunlun Orogenic Belt is located in the western part of the Central Orogenic Belt of China, with a large number of Triassic igneous rocks parallel to the Paleo-Tethys ophiolite belt, which provides a large amount of geological information for the tectonic evolution of the Paleo-Tethys Ocean. The granitoids studied in this paper are located in the Ela Mountain area in the eastern part of the East Kunlun Orogenic Belt. Zircon U-Pb dating results show that these different types of granitoids were crystallized in the Triassic. The 247.5 Ma porphyritic granites from Zairiri (ZRR) displayed calc-alkaline I-type granite affinities, with the zircon εHf(t) values being mainly positive (−0.5 to + 3.8, TDM2 of 1309–1031 Ma), indicating that they are derived from the partial melting of the juvenile crust and mixed with ancient crustal components. The 236.8 Ma Henqionggou (HQG) granodiorites and 237.5 Ma Daheba (DHB) granodiorites are high-K calc-alkaline I-type granite, and both have mafic microgranular enclaves (MMEs), showing higher and more varied Mg# (39.73–62.73), combined with their negative Hf isotopes (εHf(t) = −2.6 to −1.6, TDM2 = 1430–1369 Ma), suggesting that their primary magmas were the products of partial melting of the Mesoproterozoic lower crust that mixed with mantle-derived rocks. The 236.4 Ma DHB porphyritic diorites showed characteristics of high-K calc-alkaline I-type granitoids, with moderate SiO2 contents, medium Mg# values (40.41–40.65), with the Hf isotopes (εHf(t) = −2.9 to −0.5; TDM2 = 1451–1298 Ma) indistinguishably relative to contemporaneous host granodiorites and MMEs. The petrographic and geochemical characteristics indicate that the porphyritic diorites are the product of well-mixed magma derived from the Mesoproterozoic lower crust and lithospheric mantle. Based on the results of this paper and previous data, the chronology framework of Late Permian–Triassic magmatic rocks in the eastern part of the East Kunlun Orogenic Belt was constructed, and the magmatic activities in this area were divided into three peak periods, with each peak representing an extensional event in a particular tectonic setting, for example, P1 (slab roll-back in subduction period; 254–246 Ma), P2 (slab break-off in transition period of subduction and collision; 244–232 Ma), P3 (delamination after collision; 230–218 Ma).

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Origin of granitoids and coeval mafic microgranular enclaves in the East Kunlun Orogen, northern Tibetan Plateau: Insights from petrography, U-Pb geochronology, geochemical and isotope analyses

Chen,

Pei,

et al. 2024

Journal of Asian Earth Sciences

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Triassic granitoids in the East Kunlun Orogenic Belt, Northwestern China: magmatic source and implications for geodynamic evolution

Cited by 8 publications

References 43 publications

Petrogenesis and tectonic setting of late Permian–Early Triassic granitic rocks in the western Qaidam Basin, Qinghai–Tibetan Plateau

Petrogenesis and tectonic setting of late Permian–Early Triassic granitic rocks in the western Qaidam Basin, Qinghai–Tibetan Plateau

Petrogenesis and Tectonic Implications of the Triassic Granitoids in the Ela Mountain Area of the East Kunlun Orogenic Belt

Origin of granitoids and coeval mafic microgranular enclaves in the East Kunlun Orogen, northern Tibetan Plateau: Insights from petrography, U-Pb geochronology, geochemical and isotope analyses

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