南极格罗夫山核心区冰下地形测绘

SUBGLACIAL TOPOGRAPHIC SURVEYS IN THE KERNEL AREA OF THE GROVE MOUNTAINS,ANTARCTICA

格罗夫山地区位于中山站和冰穹A之间,是中国进行南极内陆科学综合考察的重点区。我们先后组织过5次格罗夫山地区的考察工作,开展了地质构造、古气候环境、陨石、冰盖运动监测、基础测绘和气象观测等多学科考察研究。2010年中国第26次南极科学考察期间,格罗夫山考察队利用专业探地雷达对格罗夫山东部核心区进行了冰下地形测绘工作。本文利用野外采集的测量数据(GPS/GPR数据),经数据处理后,利用专业的制图软件Corel Draw首次绘制出了格罗夫山核心区两幅冰下地形图,初步揭开了这一区域冰原岛峰冰下的地貌形态,对于今后研究整个格罗夫山地区真实的基岩地貌和可能存在的上新世古冰下沉积盆地具有探索性意义。本文还对哈丁山-萨哈罗夫岭间横截面进行分析,发现这两个冰原岛峰之间的槽谷形态已经发育成熟。

The Grove Mountains are located in a remote area of inland Antarctica between Zhongshan Station and Ice Dome A. China has organized five scientific investigations in the Grove Mountains, researching geological structure,ancient climate,and meteorites,monitoring ice movement,conducting basic mapping,meteorological observations,and other multi-disciplinary observational studies. During the 26 th Chinese Antarctic Research Expedition in 2010,the Grove Mountains investigation team used specialized ground penetrating radar（ GPR） for topographic mapping under the ice in the eastern kernel area of the Grove Mountains. In this paper,global positioning system（ GPS） and GPR data are processed using professional graphics software to produce two subglacial topographic maps of the Grove Mountains kernel area. The maps revealed the structure of the nunataks and the bedrock in this area,and identified a possible sedimentary basin under the Pliocene epoch fossil ice. In addition,cross-sectional analysis of the area between Harding Hill and the Sakharov Ridge showed that the box valley shape between the two nunataks has already matured.