| 南极中山站-昆仑站间地壳厚度分布 |
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| 引用本文： | 冯梅,安美建,安春雷,史贵涛,赵越,李院生,Douglas Wiens.南极中山站-昆仑站间地壳厚度分布[J].极地研究,2014,26(2):177-185. |
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| 作者姓名： | 冯梅 安美建 安春雷 史贵涛 赵越 李院生 Douglas Wiens |
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| 作者单位： | 1.中国地质科学院地质力学研究所，北京 100081;2.中国极地研究中心，上海 200136;3.Department of Earth and Planetary Science, Washington University, St. Louis, MO 63130-4899, USA |
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| 基金项目： | 国家自然科学基金(NSFC-40874021);科技支撑项目(2006BAB18B08);南极环境综合分析与评价项目(CHINARE2013-02-05);中国国际极地年项目资助 |
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| 摘 要： | 自第4个国际极地年2007/2008开始至2013年,中国南极内陆冰盖科考队相继在自南极大陆边缘的中山站至东南极地形最高点昆仑站(Dome A)一线进行了低温甚宽频地震观测。本文对7个天然地震台站数据进行了分析,提取了这些台站的S波接收函数,据此反演获得了这些台站下的地壳厚度分布。结果显示:随着纬度的升高,地壳厚度由大陆边缘的中山站下的约38 km逐渐增加至CHNB台下的58 km,随后又于CHNA台站下方减薄至47 km,然后快速增大到南极地形最高点昆仑站(Dome A)下的62 km。昆仑站或Dome A是南极大陆地壳最厚的地方。从中山站至昆仑站之间地壳厚度的变化与冰下地貌变化存在明显的相关性,它们都说明了从中山站至CHNB之间地壳构造相对均匀。在距昆仑站约200 km的CHNA台下的地壳厚度(约47 km)明显比临近台站地壳偏薄,这可能说明了甘伯采夫山脉地壳侧向变化较大,即其形成时所遭受的构造作用较复杂。
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| 关 键 词： | 地壳厚度 接收函数 昆仑站 东南极 南极内陆科考 |
| 收稿时间： | 2013-07-15 |
CRUSTAL THICKNESSES ALONG THE TRAVERSE FROM ZHONGSHAN TO DOME A IN EAST ANTARCTICA |
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| Feng Mei,An Meijian,An Chunlei,Shi Guitao,Zhao Yue,Li Yuansheng,Douglas Wiens.CRUSTAL THICKNESSES ALONG THE TRAVERSE FROM ZHONGSHAN TO DOME A IN EAST ANTARCTICA[J].Chinese Journal of Polar Research,2014,26(2):177-185. |
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| Authors: | Feng Mei An Meijian An Chunlei Shi Guitao Zhao Yue Li Yuansheng Douglas Wiens |
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| Institution: | 1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;2. Polar Research Institute of China, Shanghai 200136, China;3.Department of Earth and Planetary Science, Washington University, St. Louis, MO 63130-4899, USA |
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| Abstract: | From the 4th International Polar Year in 2007/2008 to 2013, Chinese Antarctic inland icecap expeditions deployed cold-mode very-broadband seismic stations along the path from Zhongshan to Kunlun (Dome A). Using the observations recorded by the stations, we retrieved S-receiver functions of 7 stations from seismic waveform observations, and inverted for crustal thicknesses beneath the seismic stations using the receiver functions. The result shows, with the increasing of latitude of the seismic stations, crustal thicknesses increase from 38 km beneath Zhongshan station to ~58 km beneath EAGLE and CHNB; then decrease to 47 km beneath CHNA; and finally increase to 62 km beneath the highest point of the Antarctica, Kunlun station (Dome A). This thickness variation is consistent with the bedrock surface variation along the path. The thickness variation indicates that the tectonics between Zhongshan and CHNB is relatively homogeneous. The crustal thickness beneath Kunlun station is not only the largest in Antarctica but also is very large comparing with cratons in other continents. The crust beneath CHNA is ~10 km thinner than neighboring stations, which may be resulted by short-time observation for the station and also may indicate that the crustal structure lateral variation is very large. |
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| Keywords: | crustal thickness seismic station Dome A East Antarctica Antarctic expedition |
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