| Ar-Ar geochronology of Late Mesozoic volcanic rocks from the Yanji area, NE China and tectonic implications |
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| 作者姓名： | LI ChaoWen GUO Feng FAN WeiMing & GAO XiaoFeng Key Laboratory of Marginal Sea Geology Guangzhou institute of Geochemistry Chinese Academy of Sciences Guangzhou China Graduate University of the Chinese Academy of Sciences Beijing China |
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| 作者单位： | LI ChaoWen1，2，GUO Feng1，FAN WeiMing1 & GAO XiaoFeng1，2 1 Key Laboratory of Marginal Sea Geology，Guangzhou institute of Geochemistry，Chinese Academy of Sciences，Guangzhou 510640，China; 2 Graduate University of the Chinese Academy of Sciences，Beijing 100039，China |
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| 基金项目： | 国家自然科学基金;中国科学院基金 |
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| 摘 要： | Ar-Ar dating results of late Mesozoic-Cenozoic volcanic rocks from the Yanji area, NE China provide a new volcano-sedimentary stratigraphic framework. The previously defined “Triassic-Jurassic” volcanic rocks (including those from Sanxianling, Tuntianying, Tianqiaoling and Jingouling Fms.) were erupted during 118―106 Ma, corresponding to Early Cretaceous. The new eruption age span is slightly younger than the main stage (130―120 Ma) of the extensive magmatism in the eastern Central Asian Orogenic Belt and its adjacent regions. Subduction-related adakites occurring in the previously defined Quanshuicun Fm. were extruded at ca. 55 Ma. Based on these new Ar-Ar ages, the late Mesozoic to Palaeocene volcano-sedimentary sequences is rebuilt as: Tuopangou Fm., Sanxianling/Tuntianying Fm. (118―115 Ma), Malugou/Tianqiaoling Fm. (K1), Huoshanyan/Jingouling Fm. (108―106 Ma), Changcai Fm. (K2), Quanshuicun Fm. (~55 Ma) and Dalazi Fm. Our results suggest that subduction of the Pa- laeo-Pacific Ocean beneath the East Asian continental margin occurred during 106 to 55 Ma, consistent with the paleomagnetic observations and magmatic records which indicated that the Izanagi-Farallon ridge subduction beneath the southwestern Japan took place during 95―65 Ma.
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| 收稿时间： | 5 April 2006 |
| 修稿时间： | 17 July 2006 |
Ar-Ar geochronology of Late Mesozoic volcanic rocks from the Yanji area,NE China and tectonic implications |
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| LI ChaoWen,,GUO Feng,FAN WeiMing & GAO XiaoFeng, Key Laboratory of Marginal Sea Geology,Guangzhou institute of Geochemistry,Chinese Academy of Sciences,Guangzhou ,China, Graduate University of the Chinese Academy of Sciences,Beijing ,China.Ar-Ar geochronology of Late Mesozoic volcanic rocks from the Yanji area, NE China and tectonic implications[J].Science in China(Earth Sciences),2007,50(4):505-518. |
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| Authors: | Li ChaoWen Guo Feng Fan WeiMing Gao XiaoFeng |
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| Institution: | 1. Key Laboratory of Marginal Sea Geology,Guangzhou institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China;Graduate University of the Chinese Academy of Sciences,Beijing 100039,China
2. Key Laboratory of Marginal Sea Geology,Guangzhou institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China |
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| Abstract: | Ar-Ar dating results of late Mesozoic-Cenozoic volcanic rocks from the Yanji area, NE China provide a new volcano-sedimentary
stratigraphic framework. The previously defined “Triassic-Jurassic” volcanic rocks (including those from Sanxianling, Tuntianying,
Tianqiaoling and Jingouling Fms.) were erupted during 118–106 Ma, corresponding to Early Cretaceous. The new eruption age
span is slightly younger than the main stage (130–120 Ma) of the extensive magmatism in the eastern Central Asian Orogenic
Belt and its adjacent regions. Subduction-related adakites occurring in the previously defined Quanshuicun Fm. were extruded
at ca. 55 Ma. Based on these new Ar-Ar ages, the late Mesozoic to Palaeocene volcano-sedimentary sequences is rebuilt as:
Tuopangou Fm., Sanxianling/Tuntianying Fm. (118–115 Ma), Malugou/Tianqiaoling Fm. (K1), Huoshanyan/Jingouling Fm. (108–106 Ma), Changcai Fm. (K2), Quanshuicun Fm. (∼55 Ma) and Dalazi Fm. Our results suggest that subduction of the Palaeo-Pacific Ocean beneath the East
Asian continental margin occurred during 106 to 55 Ma, consistent with the paleomagnetic observations and magmatic records
which indicated that the Izanagi-Farallon ridge subduction beneath the southwestern Japan took place during 95–65 Ma.
Supported by the National Natural Science Foundation of China (Grant Nos. 40373018 and 40334043) and the Chinese Academy of
Sciences (Grant Nos. KZCX2-104 and GIGCX-04-04) |
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| Keywords: | Ar-Ar geochronology Late Mesozoic volcanic rocks tectonic implications Yanji area |
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