Zircon U–Pb ages and tectonic implications of ‘Early Paleozoic’ granitoids at Yanbian, Jilin Province, northeast China

Abstract

The Yanbian area is located in the eastern part of the Central Asian Orogenic Belt (CAOB) of China and is characterized by widespread Phanerozoic granitic intrusions. It was previously thought that the Yanbian granitoids were mainly emplaced in the Early Paleozoic (so-called 'Caledonian' granitoids), extending east-west along the northern margin of the North China craton. However, few of them have been precisely dated; therefore, five typical 'Caledonian' granitic intrusions (the Huangniling, Dakai, Mengshan, Gaoling and Bailiping batholiths) were selected for U-Pb zircon isotopic study. New-age data show that emplacement of these granitoids extended from the Late Paleozoic to Late Mesozoic . This indicates that no 'Caledonian' granitic belt exists along the northern margin of the North China craton. The granitoids can be subdivided into four episodes based on our new data: Early Permian (285 ± 9 Ma), Early Triassic (249-245 Ma), Jurassic and . The 285 ± 9 Ma tonalite was most likely related to subduction of the Paleo-Asian Oceanic Plate beneath the North China craton, followed by Triassic (249-245 Ma) syn-collisional monzogranites, representing the collision of the CAOB orogenic collage with the North China craton and final closure of the Paleo-Asian Ocean. The Jurassic granitoids resulted from subduction of the PaleoPacific plate and subsequent collision of the Jiamusi-Khanka Massif with the existing continent, assembled in the Triassic. The Early Cretaceous granitoids formed in an extensional setting along the eastern Asian continental margin.

Variable sediment flux in generation of Permian subduction-related mafic intrusions from the Yanbian region, NE China

“…7, Wu et al, 2000). (3) In the Yanbian area, the reported oldest granitoid was formed at 285 Ma (Zhang et al, 2004), which has similar Sr-Nd ( 87 Sr/ 86 Sr(i) = 0.706, ε Nd (t) = −13.6) isotopic compositions to the Mashan Group. (4) Cao et al (2013) reported that a middle Permian garnet-bearing monzogranite from central Jilin province (about 200 km northwest to the Yanbian area) had zircon ε Hf (t) values from −17.1 to −14.1, and with Hf single-stage model ages (T DM1 ) of 1.51-1.66 Ga. All these facts reflect the existence of recycled crustal rocks at lower-middle crustal levels in the Yanbian and adjacent areas.…”

“…The mafic intrusions were previously considered to have formed in late Paleozoic, but the precise emplacement ages are lacking. The Mesozoic geological evolution of the area was characterized by eruption of voluminous lavas, granitoid emplacement and deposition of terrestrial sediments, probably as a result of subduction of the paleo-Pacific Ocean (Zhang et al, 2004;Li et al, 2007;Xu et al, 2013b;Guo et al, 2015).…”

“…Available zircon U-Pb age data indicated that emplacement of the granitoids extended from late Palaeozoic (285 Ma) to early Cretaceous (112 Ma) (Zhang et al, 2004;Wu et al, 2011;Li, 2012). The mafic intrusions were previously considered to have formed in late Paleozoic, but the precise emplacement ages are lacking.…”

“…It was considered part of the orogenic collage between the North China Craton in the south and the Jiamusi-Khanka Massifs in the northeast ( Fig. 1b; Wu et al, 2000;Jia et al, 2004;Zhang et al, 2004;Guo et al, 2010;Zhou and Wilde, 2013). To the southwest, there occurs Archean to early Proterozoic greenschist-and amphibolite-facies metamorphosed granitic rocks (JBGMR, 1989).…”

Revised stratigraphy and zircon U-Pb age data of the Hitachi metamorphic formations in the southern Abukuma Mountains, and reconstruction of the basement of the Northeast Japan Arc before the opening of the Japan Sea

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