摘要
我国第19次南极考察队于2002—2003年在格罗夫山地区寻找陨石,共搜集了4448块陨石,其中石陨石2892块、球粒陨石1524块、碳质球粒陨石25块、无球粒陨石6块和石铁陨石1块。这次陨石调查主要沿阵风悬崖南段、中段、北段蓝冰区进行,在上述地区分别发现了41块、2684块、1721块陨石。本次考察中,在已搜寻的蓝冰区,尽管其富集程度有很大差异,但均发现了陨石,因此,格罗夫山其它尚未搜寻的蓝冰区也可能富集陨石。大部分陨石可能是风从阵风悬崖或其上方吹来的,因这些陨石质量小,分布在蓝冰的凹地或冰碛的迎风坡。而另一些质量大的陨石可能受冰川搬运至收集地点,因冰的消融而露出蓝冰表面。这些陨石的发现充分证明格罗夫山地区为南极最富集陨石的地区之一。
4448 meteorites, including 2892 stone meteorites, 1524 chondrites, 25 carbonaceous chondrites, 6 achondrites and 1 stone-iron meteorite, have been collected in Grove Mountains, Antarctica, during the 19th Chinese Antarctic Research Expedition （CHINARE） in 2002-- 2003 austral summer. Blue ice surface of the southern, middle and northern segments of the Gale Escarpment was searched during this exploration, with discovery of 41, 2684 and 1721 meteorites, respectively. We found meteorites on the blue ice surfaces searched with different discoveries of meteorites. Hence, it can be inferred that most other blue ice fields unsearched in Grove Mountains may have meteorites concentrated too. Most small pieces of meteorites （ 〈 100 g） on cancaves of blue ice fields or on windward slopes of moraines, were probably blown from the Gale Escarpment and/or upper ice plateau. Meteorites with mass more than 100 g were exposed on blue ice surface due to ablation of ice, and they were probably transported to the locations by glacier. The large number of meteorites demonstrates that the Grove Mountain is one of the most meteorite-concentrated areas in Antarctica.
出处
《极地研究》
CAS
CSCD
2005年第3期215-223,共9页
Chinese Journal of Polar Research
基金
中国科学院知识创新方向性研究课题(KZCX3-SW-123)
国家自然科学基金项目(No.40473037
No.40232026)资助
关键词
南极
陨石
格罗夫山
陨石搜集
陨石富集
Antarctica, meteorite, Grove Mountains, meteorite collection, meteorite concen-tration area.
