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

Island Arc - Tập 13 Số 4 - Trang 484-505 - 2004
Yanbin Zhang1, Fu‐Yuan Wu1, Simon A. Wilde2, Mingguo Zhai1, Xuehong Lu3, Deyou Sun3
1Institute of Geology and Geophysics, Chinese Academy of Sciences, PO Box 9825, Beijing 100029, China (email: [email protected])
2Department of Applied Geology, Curtin University of Technology, PO Box U1987, Perth, Western Australia 6845, Australia
3College of Earth Sciences, Jilin University, Changchun 130061, China

Tóm tắt

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 (285–116 Ma). 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 (192–168 Ma) and Cretaceous (119–116 Ma). 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 Paleo‐Pacific 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.

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Island Arc

Tập 13 Số 4

484-505

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