Submarine Mass Movements and their Consequences - 7th International Symposium
Submarine Mass Movements and their Consequences - 7th International Symposium
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潜艇质量运动及其后果 - 第七届国际研讨会
DOI：
10.1007/978-3-319-20979-1_14
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Krastel S
中科院分区：
文献类型：
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作者：
Krastel S
阿加迪尔峡谷是世界上最大的海底峡谷之一，为阿加迪尔盆地和更广泛的摩洛哥浊流系统提供了巨大的海底沉积物重力流。虽然摩洛哥的浊积系统研究得非常充分，但几乎没有来自源头地区，即阿加迪尔峡谷的数据。阿加迪尔峡谷地区的新声学和沉积学数据是在2013年秋季的RV Maria S.Merian Cruise 32期间收集的。数据显示，在阿加迪尔峡谷头部以南约200公里处有一个突出的头部区域。破坏发生在沉积波场中的一个明显的软弱层上。板状破裂迅速崩解并转化为泥石流，在2500米水深进入阿加迪尔峡谷。有趣的是，尽管坡度显著增加，但泥石流进入峡谷时并未解体为浑浊水流。取而代之的是，这些材料作为碎屑岩被运送到峡谷下至少200公里处。这种巨大的泥石流不太可能对更广泛的摩洛哥浊流系统中的沉积物做出重大贡献。
Agadir Canyon is one of the largest submarine canyons in the World, supplying giant submarine sediment gravity flows to the Agadir Basin and the wider Moroccan Turbidite System. While the Moroccan Turbidite System is extremely well investigated, almost no data from the source region, i.e. the Agadir Canyon, are available. New acoustic and sedimentological data of the Agadir Canyon area were collected during RV Maria S. Merian Cruise 32 in autumn 2013. The data show a prominent headwall area around 200 km south of the head of Agadir Canyon. The failure occurred along a pronounced weak layer in a sediment wave field. The slab-type failure rapidly disintegrated and transformed into a debris flow, which entered Agadir Canyon at 2500 m water depth. Interestingly, the debris flow did not disintegrate into a turbidity current when it entered the canyon despite a significant increase in slope angle. Instead, the material was transported as debrite for at least another 200 km down the canyon. It is unlikely that this giant debris flow significantly contributed to the deposits in the wider Moroccan Turbidite System.