Upper slope sediment waves in the Cilician Basin, northeastern Mediterranean
Upper slope sediment waves in the Cilician Basin, northeastern Mediterranean
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DOI：
10.1016/s0025-3227(02)00562-5
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发表时间：
2002-12
期刊：
影响因子：
2.9
通讯作者：
V. Ediger;A. Velegrakis;G. Evans
中科院分区：
文献类型：
--
作者：
V. Ediger;A. Velegrakis;G. Evans
在梅尔辛大陆架近海的两个海底峡谷之间的河间，在西里西亚盆地（地中海东北部）的上斜坡沉积物中观察到了大的沉积物波浪。在沉积序列中有几代沉积物波浪叠加，在由细粒沉积物组成的区域的海床上发现了最新的底形。表层沉积物波场，估计覆盖面积为255平方公里，水深在250米至310米之间。埋藏沉积物波场具有相似的尺寸，但它们位于更远的下坡。波浪尺度随水深和沉积序列中的深度而增加。最大的底形高40米，长1.8公里。大多数波似乎一直向上迁移，即向北/东北方向迁移，并且该迁移方向在整个沉积序列中基本一致。这种一致性表明在相当长的时间间隔内形成和维持类似的机制。所观察到的底形的形态和迁移模式表明，在波形成过程中，在西里西亚盆地的沉积已被控制的近床流类似于目前的小亚细亚电流所产生的，虽然这些流量可能已经在过去比他们现在更强。
Large sediment waves have been observed within the upper slope deposits of the Cilician Basin (northeastern Mediterranean), at the interfluve between two submarine canyons present offshore of the Mersin Shelf. There are several generations of sediment waves stacked within the sedimentary sequence, with the most recent bedforms found on the seabed in an area consisting of fine-grained sediments. The surficial sediment wave field, estimated to cover an area of ∼55 km2, is found at water depths between 250 and 310 m. The buried sediment wave fields have similar dimensions, but they are located further downslope. Wave dimensions increase with water depth and depth in the sedimentary sequence. The largest bedforms reach 40 m in height and 1.8 km in length. Most waves appear to have been migrating upslope, i.e. towards the north/northeast, and this migration direction is mostly consistent throughout the sedimentary sequence. This consistency indicates similar mechanisms of formation and maintenance over a considerable time interval. The morphology and migration pattern of the observed bedforms suggests that sedimentation in the Cilician Basin during wave formation has been controlled by near-bed flows resembling those generated by the present Asia Minor Current, although these flows may have been stronger in the past than they are at present.