Construction of the Pyreneo-Languedocian Sedimentary Ridge and associated sediment waves in the deep western Gulf of Lions (Western Mediterranean)
Construction of the Pyreneo-Languedocian Sedimentary Ridge and associated sediment waves in the deep western Gulf of Lions (Western Mediterranean)
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DOI：
10.1016/j.marpetgeo.2005.03.008
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发表时间：
2005-06
影响因子：
4.2
通讯作者：
Laurent Jallet;P. Giresse
中科院分区：
文献类型：
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作者：
Laurent Jallet;P. Giresse
迁移沉积物波已被广泛的海洋环境，包括邻近海底峡谷和山谷的浊积岩堤坝。位于狮子湾（地中海西北部）的比利牛斯-埃西多西亚沉积脊（PLSR）似乎与这样的堤坝相似。为了了解PLSR和相关沉积物波的结构，进行了几项尺度研究。这些数据包括在两个连续波的上坡和下坡侧收集的高分辨率和中分辨率地震反射剖面和岩心。在区域范围内，PLSR的情况受到上新世盐构造运动的强烈影响，导致在加泰罗尼亚-Eduedocian峡谷口形成盆地。之后，盐构造在第四纪主要是不活跃的，波不是广泛的浅表构造活动的结果。在PLSR的规模，建设发生在第四纪，并分为三个阶段的基础上认识到波的几何形状，沉积物供应的变化和溢出源的变化。常见的沉积物波横截面已被确定，并建议浊流或重力流的起源。沉积学、岩石地层学和生物地层学研究集中在最近一次海平面上升和高水位期。研究结果支持沉积物波的启动和发生的沙传输，即使在最近的一段时间。砂层和高沉积速率是上游侧翼沉积物的特征。较低的沉积速率对应于下游侧翼。
Migrating sediment waves have been recognized in a wide range of marine settings, including turbidite levees adjacent to submarine canyons and valleys. The Pyreneo-Languedocian Sedimentary Ridge (PLSR), located in the Gulf of Lions (North-western Mediterranean), appears similar to such a levee. In an attempt to understand the construction of both the PLSR and associated sediment waves, several scale-studies were done. The data include high and medium resolution seismic reflection profiles and cores collected both on upslope and downslope sides of two successive waves. At a regional scale, the situation of the PLSR was strongly influenced by Pliocene salt tectonics movements that resulted in a basin at the mouth of the Catalano-Languedocian canyons. Later, salt tectonics were chiefly inactive during Quaternary and waves do not result of an extensive superficial tectonic activity. At the scale of the PLSR, the construction occurred during the Quaternary and is divided in three stages recognized on the basis of waves' geometry, sediment supplies changes and spillover source variations. Common sediment wave cross-sections have been identified and suggest a turbidite or a gravity-flow origin. Sedimentological, lithostratigraphical and biostratigraphical studies focus on the last sea-level rise and high stand period. The results support the sediment-wave initiation and the occurrence of sand transfers even during the more recent period. Sand layers and high sedimentation rates characterize the deposits on upstream flanks. Lower rates of deposition correspond with downstream flanks.