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

ISSN号：1000-4734
期刊名称：《矿物学报》
时间：0
分类：P736.1[天文地球—海洋地质;天文地球—海洋科学] Q959.12[生物学—动物学]
作者机构：[1]Key Laboratory of Submarine Geoscience, State Oceanic Administration, Hangzhou 310012, China, [2]Second Institution of Oceanography, State Oceanic Administration, Hangzhou 310012, China, [3]Key Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, China, [4]Western Australian Argon Isotope Facility, Department of Applied Geology and JdL Centre, Curtin University, GPO Box U1987, Perth 6845, WA, Australia
相关基金：Acknowledgments This paper also benefits from discussions and supports from Dr. Aiguo Ruan, Weiwei Ding, Tao Zhao, Zhengli Wu in Second Insti- tution of Oceanography, SOA and Dr. Chao Liu in Yale University. We would like to thank Dr. lnna Safonova for constructive comment5 that significantly improve the paper. This research was 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） and China Ocean Mineral R＆D Association （COMRA） project （DY125-12- R-02, 04, 06）.

作者： Xiaohu Li[1,2], Jiabiao Li[1,2], Xing Yu[1,2], Chunsheng Wang[2,3], Fred Jourdan[4]

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, ^40Ar/^39Ar datingSeamount trachyteNorthwest sub-basinExpansion historySouth China Sea

中文摘要：

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.

英文摘要：

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 the ^40Ar/^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 NW-SE 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 of^40Ar/^39Ar age data and previous geophysical data.

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