Interaction between seabed morphology and water masses around the seamounts on the Motril Marginal Plateau (Alboran Sea, Western Mediterranean)
Interaction between seabed morphology and water masses around the seamounts on the Motril Marginal Plateau (Alboran Sea, Western Mediterranean)
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DOI：
10.1007/s00367-011-0246-y
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发表时间：
2011-12-01
影响因子：
2.1
通讯作者：
Diaz-del-Rio, Victor
中科院分区：
文献类型：
--
作者：
Palomino, Desiree;Vazquez, Juan-Tomas;Diaz-del-Rio, Victor
利用高分辨率(SPAKER)和甚高分辨率(TOPAS)地震反射剖面和多波束测深技术研究了莫特里尔边缘高原(阿尔博兰海北部)海山附近的海底地貌。这项研究的目的是确定最近的地质过程，特别是那些控制与地中海中部和深层水团有关的等高线沉积系统的地质过程。确定了六组形态特征：结构特征(海山顶部、构造凹陷)、与流体逃逸有关的特征(麻点)、质量运动特征(沟谷、滑坡)、底流特征(护城河、冲刷痕迹、阶地、细长和分离的漂流、抹灰漂流、受限漂流、席状漂流)、混合特征(脊)和生物特征(包括(死)冷水珊瑚的证据，如Lophelia pertusa和Madreport a oculata)。控制这些特征形成的主要过程是最近的构造活动和地中海水团与海底地形的相互作用。海山作为地形屏障，影响地中海深处水团的路径和速度，这些水团被分成几股，与周围的海底相互作用。相比之下，地中海中间水团的影响主要限于海山顶部。沉积物不稳定和流体逃逸作用次之，它们的发生可能与地震活动有关。
The seabed morphology in the vicinity of the seamounts on the Motril Marginal Plateau (northern Alboran Sea) was investigated using high-resolution (sparker) and very high-resolution (TOPAS) seismic reflection profiles and multibeam bathymetry. The aim of the study was to determine the recent geological processes, and in particular those that control the contourite depositional system associated with the intermediate and deep Mediterranean water masses. Six groups of morphological features were identified: structural features (seamount tops, tectonic depressions), fluid escape-related features (pockmarks), mass-movement features (gullies, slides), bottom-current features (moats, scour marks, terraces, elongated and separated drifts, plastered drifts, confined drifts, sheeted drifts), mixed features (ridges) and biogenic features (including evidence of (dead) cold water corals such as Lophelia pertusa and Madrepora oculata). The main processes controlling the formation of these features are recent tectonic activity and the interaction of Mediterranean water masses with the seafloor topography. Seamounts act as topographic barriers that affect the pathway and velocity of the deep Mediterranean water masses, which are divided into strands that interact with the surrounding seafloor. The influence of the intermediate Mediterranean water mass, by contrast, is restricted mainly to the tops of the seamounts. Sediment instability and fluid-escape processes play a minor role, their occurrence being probably related to seismicity.