Results from the Greenland Search for Meteorites expedition
Results from the Greenland Search for Meteorites expedition
复制标题
格陵兰陨石搜寻探险队的结果
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
R. Harvey
中科院分区：
文献类型：
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作者：
H. Haack;J. Schutt;A. Meibom;R. Harvey
摘要-在格陵兰岛发现了类似于南极洲含有陨石的蓝色冰场的蓝色冰区后，2003年8月对几个最有希望的地点进行了地面搜索。冰场位于格陵兰岛东北部的孔克里斯蒂安X地，北纬74°，海拔2100米至2400米。在搜索的任何地点都没有发现陨石。偶尔有显著融化的证据(充满的裂缝和融化的冰盖)表明，夏季的温度有时高到像陨石一样，黑色的岩石可以融化穿过上层的冰层。在冰面以下50厘米处发现了小型陆地岩石和低温岩。在努纳塔克下游的冰层顶部发现了一米大小的陆地岩石。这些岩石遮蔽了下面的冰，由于它们显然太大，在温暖的日子里无法取暖，所以当周围的冰被融化时，它们仍然留在表面。我们的发现有力地表明，格陵兰岛目前不太可能在蓝色冰原上聚集大量的陨石。
Abstract— Following discoveries of blue ice areas in Greenland resembling meteorite‐bearing blue ice fields in Antarctica, a surface search of several of the most promising sites was carried out in August 2003. The ice fields are located in Kong Christian X Land, in northeastern Greenland around 74°N at elevations between 2100 and 2400 m. No meteorites were found in any of the localities that were searched. Evidence of occasional significant melting (filled crevasses and melt sheets) suggest that summer temperatures are sometimes high enough that dark rocks, like meteorites, can melt through the upper layers of ice. Small terrestrial rocks and cryogenite were found down to 50 cm below the ice surface. Meter‐sized terrestrial rocks were found on top of the ice downstream from nunataks. These rocks shade the ice below, and since they were apparently too massive to warm up during warm days, they remained at the surface as the surrounding ice ablated away. Our findings strongly suggest that Greenland is currently unlikely to harbor significant meteorite concentrations on blue ice fields.