Iceberg production, debris rafting, and the extent and thickness of Heinrich layers (H-1, H-2) in North Atlantic sediments
Iceberg production, debris rafting, and the extent and thickness of Heinrich layers (H-1, H-2) in North Atlantic sediments
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北大西洋沉积物中的冰山产生、碎片漂流以及海因里希层（H-1、H-2）的范围和厚度
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发表时间：
1995
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通讯作者：
I. N. McCave
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作者：
J. Dowdeswell;M. Maslin;J. Andrews;I. N. McCave
根据对50多个北大西洋岩心的磁化率分析绘制的最后两个事件（H-1，14.5万年和H-2，121.1万年）的海因里希层分布图，提供了迄今为止关于其范围和厚度的最详细信息。各层的综合空间平均厚度为10-15 cm，并有向东的强烈距离衰减。北大西洋上的沉积模式与H-1和H-2事件相似，表明冰山遵循类似的漂移轨迹。冰山生产率和沉积物通量从哈德逊海峡流域流域的北美Laurentide冰盖，主要的冰山源的事件，使用质量平衡的方法进行了计算。这提供了一个信封的沉积速率和预测，它将需要50和1250年之间的冰山沉积物输送积累平均10厘米厚的海因里希层在北大西洋，这取决于所使用的模型假设。Heinrich事件最可能持续250-1250年。
The pattern of Heinrich-layer distribution for the last two events (H-1, ∼14.5 and H-2, ∼21.1 ka), mapped from magnetic susceptibility analysis of more than 50 North Atlantic Ocean cores, provides the most detailed information to date on their extent and thickness. An integrated spatial average thickness for the layers is 10–15 cm, and there is a strong distance decay eastward. The pattern of deposition over the North Atlantic is similar for events H-1 and H-2, indicating that icebergs followed similar drift tracks. Rates of iceberg production and sediment flux from the Hudson Strait drainage basin of the North American Laurentide ice sheet, the major iceberg source for the events, were calculated by using a mass-balance approach. This provides an envelope of sedimentation rates and the prediction that it would take between 50 and ∼1250 yr of iceberg sediment delivery to accumulate a Heinrich layer averaging 10 cm thick over the North Atlantic, depending on the model assumptions used. The most likely duration of Heinrich events is 250–1250 yr.