Structural Studies Of Bare Ice Near The Allan Hills, Victoria Land, Antarctica: A Mechanism Of Meteorite Concentration
Structural Studies Of Bare Ice Near The Allan Hills, Victoria Land, Antarctica: A Mechanism Of Meteorite Concentration
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南极洲维多利亚地艾伦山附近裸冰的结构研究：陨石集中的机制
DOI：
10.3189/s0260305500002810
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发表时间：
1982
影响因子：
2.9
通讯作者：
J. Annexstad
中科院分区：
文献类型：
--
作者：
F. Nishio;N. Azuma;A. Higashi;J. Annexstad
结构实验室研究是由在南极洲维多利亚地艾伦山附近的表面和一个浅钻孔中收集的冰进行的。将所得结果与冰川学调查资料相结合，描述了南极东部冰盖边缘地区冰流堆积陨石的机制。根据冰的结构特征和粒度估计，裸冰的年龄约为20 ka。这与在同一地区发现的陨石地球年龄的最小值一致。几百颗陨石集中在裸冰区，这可以解释为在以前的冰期，汇水区面积扩大了，或者是对陨石坠落的流入率估计的修正系数，或者更可能是两者的结合。
Structural laboratory studies were made of ice collected at the surface and from a shallow bore hole in the bare ice near the Allan Hills, Victoria Land, Antarctica. The results obtained were combined with glaciological survey data to describe the mechanism of accumulation of meteorites by ice flow in a marginal area of the East Antarctic ice sheet. The age of the bare ice, approximately 20 ka, was estimated by fabric characteristics and grain size of the ice. This conforms to the minimum value of the terrestrial age of the meteorites found in the same area. The several hundred meteorite finds concentrated in the bare-ice area can be explained by an expanded catchment area during a previous ice age, or by a correction factor for the estimate of the influx rate of meteorite fall, or more probably by a combination of both.