Icebergs and the Sea Floor of the East Greenland (Kangerlussuaq) Continental Margin
Icebergs and the Sea Floor of the East Greenland (Kangerlussuaq) Continental Margin
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东格陵兰岛（Kangerlussuaq）大陆边缘的冰山和海底
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
J. Milliman
中科院分区：
文献类型：
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作者：
J. Syvitski;A. Stein;J. Andrews;J. Milliman
康格鲁苏瓦克大陆边缘被冰山所覆盖。边缘有利于沟保存，因为大陆架上的沉积是低的，至少自上次（Flakkerhuk）冰期，因为货架深度远低于波基地。虽然在康克鲁斯瓦克地区犁沟很常见，但形成较大犁沟的冰山大多不存在。只有在750米深的Kangerlussuaq海槽周围的水深高地上才观察到“新”冰山沟。海槽周围的水深障碍物防止有深龙骨的冰山进入海槽。巨大的和风化的（旧）沟位于受保护的槽内，显然是在古冰川冰盖终端形成的，当格陵兰冰盖延伸到大陆架上。在Kangerlussuaq海槽的较深部分，全新世泥浆目前正在掩埋这些较老的冰山沟。可能来自冰岛的古冰川边缘，解释了东格陵兰大陆斜坡上发现的无声沟。自14，750 ± 720 BP以来，这些硬地遗址上没有沉积物。
The Kangerlussuaq margin is well furrowed by icebergs. The margin favors furrow preservation since sedimentation on the continental shelf is low, at least since the last (Flakkerhuk) glaciation and because shelf depths are well below wave base. While furrows are common in the Kangerlussuaq region, the icebergs that created the larger furrows are mostly absent. “Fresh” iceberg furrows are observed only on the bathymetric highs surrounding the 750-m-deep Kangerlussuaq Trough. Bathymetric barriers around the trough prevent icebergs with deep keels from entering the trough. Enormous and weathered (older) furrows are located inside the protected trough, apparently formed at paleocalving ice sheet termini, when the Greenland Ice Sheet extended onto the shelf. In the deeper sections of Kangerlussuaq Trough, Holocene mud is presently burying these older iceberg furrows. Paleocalving ice sheet margins, possibly from Iceland, account for muted furrows found on the upper continental slope of East Greenland. No sediment has been deposited over these hardground sites since 14,750 ± 720 BP.