Zircon U–Pb ages and tectonic implications of ‘Early Paleozoic’ granitoids at Yanbian, Jilin Province, northeast China
Zircon U–Pb ages and tectonic implications of ‘Early Paleozoic’ granitoids at Yanbian, Jilin Province, northeast China
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DOI：
10.1111/j.1440-1738.2004.00442.x
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发表时间：
2004-12
期刊：
影响因子：
1.5
通讯作者：
Yanbin Zhang;Fu-Yuan Wu;S. Wilde;M. Zhai;Xiaoping Lu;Deyou Sun
中科院分区：
文献类型：
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作者：
Yanbin Zhang;Fu-Yuan Wu;S. Wilde;M. Zhai;Xiaoping Lu;Deyou Sun
延边地区位于中国中亚造山带东部，具广泛的显生宙花岗岩侵入体特征。前人认为延边花岗岩类主要侵位于早古生代(即所谓的加里东期)，沿中国克拉通北缘东西向延伸。因此，选取了黄泥岭、大开、蒙山、高岭和白里坪5个典型的加里东期花岗岩进行锆石U-Pb同位素研究。新时代资料表明，这些花岗岩类的侵位时间为晚古生代至晚中生代(285-116 Ma)。这表明中国克拉通北缘不存在加里东期花岗岩带。根据我们的新资料，该花岗岩类可划分为四个幕：早二叠世(285±9 Ma)、早三叠世(249~245 Ma)、侏罗纪(192~168 Ma)和白垩纪(119~116 Ma)。2 85 Ma±9 Ma英云闪长岩很可能与古亚洲板块俯冲到北中国克拉通之下有关，其次是三叠纪(2 49~2 45 Ma)同碰撞二长花岗岩，代表着CAOB造山拼贴与北中国克拉通的碰撞和古亚洲大洋的最终闭合。侏罗纪花岗岩类是古太平洋板块俯冲和佳木斯-坎卡地块与现存大陆碰撞的结果，聚集在三叠纪。早白垩世花岗岩类形成于东亚大陆边缘的伸展环境。
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.