Post-drilling recrystallization of the Byrd Station deep ice core and its relevance to current and future deep-core drilling on polar ice sheets
Post-drilling recrystallization of the Byrd Station deep ice core and its relevance to current and future deep-core drilling on polar ice sheets
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伯德站深冰芯钻后重结晶及其与当前和未来极地冰盖深冰芯钻探的相关性
DOI：
10.3189/1994aog20-1-231-236
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发表时间：
1994
影响因子：
2.9
通讯作者：
A. Gow
中科院分区：
文献类型：
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作者：
A. Gow
1967年至1968年在伯德站1200-1800米深处发现的高度紧张的冰芯在美国储存时被发现重新结晶。据推测，这种再结晶是在储存设施的温度超过- 14°C时发生的，如果不是在将岩心拉到地面的几个小时内在钻探现场准备好岩心的薄片并拍摄下来，就不会发现这种再结晶。只有在将长时间储存的岩心的新切片与原始切片进行比较后，才能显示出再结晶的全部程度。再结晶结构的纹理和结构与伯德站底部350米的自然退火冰中观察到的结构相似。因此，极地冰芯应储存在-20℃或更低的温度下，以抑制或减少钻孔后的再结晶。
Cores of highly strained ice recovered from depths of 1200–1800 m at Byrd Station in 1967–68 have been found to have recrystallized while in storage in the United States. Such recrystallization, inferred to have occurred when temperatures in the storage facility rose above about – 14°C, would not have been discovered if thin sections of the cores had not been prepared and photographed at the drill site within hours of pulling the cores to the surface. It was only after new sections of the long stored cores were compared with the original sections that the full extent of recrystallization was revealed. The recrystallized structure emulates in both texture and fabric those observed in naturally annealed ice in the bottom 350 m at Byrd Station. It is concluded that polar ice cores should be stored at temperatures of –20°C or colder in order to inhibit or minimize post-drilling recrystallization.