^(40)Ar/^(39)Ar ages of seamount trachytes from the South China Sea and implications for the evolution of the northwestern sub-basin

查看全文 作　　者：Xiaohu [1,2]Li;Jiabiao [1,2]Li;Xing [1,2]Yu;Chunsheng [2,3]Wang;Fred [4]Jourdan

机构地区：[1]Key Laboratory of Submarine Geoscience, State Oceanic Administration;[2]Second Institution of Oceanography, State Oceanic Administration;[3]Key Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration;[4]Western Australian Argon Isotope Facility, Department of Applied Geology and Jd L Centre, Curtin University

出　　处：《Geoscience Frontiers》索引2015年第6卷第4期,共7页

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.91028006 and 41276055);the National Basic Research and Development Program(Grant Nos.2007CB411700,2013CB429700);China Ocean Mineral R&D Association(COMRA)project(DY125-12-R-02,04,06) 摘　　要：A chronological study of seamount rocks in the South China Sea basin provides a great opportunity to understand the expansion and evolution history of the sea basin.In this paper,we analyzed the40Ar/39Ar age of trachytic samples collected from the Shuangfeng seamounts in the northwestern sub-basin of the South China Sea.The two samples yielded plateau ages of 23.80 0.18 and 23.29 0.22 Ma,respectively,which indicate magmatic activity in late Oligocene which helpful constraints the expansion time of the northwest sub-basin.Previous studies suggested that the northwestern sub-basin and southwestern sub-basin have experienced a relatively consistent expansion in the NWeSE direction followed by a late expansion of the eastern sub-basin.We concluded that the expansion of the northwestern sub-basin began prior to ca.24 Ma,which also implicated magmatic events of a late or stop expansion of the northwestern sub-basin combined with our results of40Ar/39Ar age data and previous geophysical data. 关键词：南海西北部中国南海南海盆地演化历史海山地球物理数据年龄数据岩浆活动

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^(40)Ar/^(39)Ar ages of seamount trachytes from the South China Sea and implications for the evolution of the northwestern sub-basin

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