捕捉一颗坠落的星星：陨石和古老的冰。

Catch a falling star: meteorites and old ice.

出版信息

Science. 1983 Oct 7;222(4619):55-7. doi: 10.1126/science.222.4619.55.

DOI:10.1126/science.222.4619.55

Abstract

A model for the process of meteorite concentration in blue ice regions of the Antarctic ice sheet is proposed based on data from near the Allan Hills and the assumptions that both meteorite influx and glacial flow have been constant. The meteorite influx is calculated to be 60 x 10(-6) kilogram per square kilometer per year, and the age of the exposed ice to be 0 to 600,000 years, varying with distance from the Allan Hills. These results are in line with other estimates of influx rate and with measurements of the terrestrial ages of the meteorites, providing support for the assumption of steady flow and meteorite influx. This may be the oldest sequence of ice in stratigraphic order yet discovered, and the results imply that this part of the east Antarctic ice sheet has been approximately steady during this time interval.

摘要

提出了一种基于南极冰盖蓝色冰区的陨石聚集过程模型，该模型基于 Allan Hills 附近的数据和陨石通量和冰川流动保持不变的假设。陨石通量计算为 60 x 10(-6) 千克/平方公里/年，暴露冰的年龄为 0 至 600,000 年，随距离 Allan Hills 的距离而变化。这些结果与其他通量率估计值以及陨石的陆地年龄测量值一致，为稳定流动和陨石通量的假设提供了支持。这可能是迄今为止发现的最古老的地层顺序冰序列，结果表明，在这段时间内，东南极洲冰盖的这一部分一直保持稳定。