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首页> 外文期刊>Marine Geology >The Messinian Salinity Crisis: New seismic evidence in the West-Sardinian Margin and Eastern Sardo-Provencal basin (West Mediterranean Sea)
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The Messinian Salinity Crisis: New seismic evidence in the West-Sardinian Margin and Eastern Sardo-Provencal basin (West Mediterranean Sea)

机译：墨西拿盐度危机：西撒丁岛边缘和东部萨多普罗旺斯盆地（西地中海）的新地震证据

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摘要

We processed and interpreted a newly acquired geophysical dataset (WS10 project) integrated with vintage seismic profiles to study the evolution of the Sardinian passive margin of the Sardo-Provencal basin. The most prominent features of the area of study are a consequence of the Messinian Salinity Crisis (MSC) which produced a thick salt layer in the deep basin. Complex halokinetic tectonics deformed the overlying Messinian Upper Unit (UU) and the Pliocene-Quaternary (PQ) sediments, sometimes also bending the sea bottom. A thinner autochthonous salt in the UU suggests at least one further low stand during the late MSCThe Messinian Erosional Surface (MES) separates the erosional truncation of the pre-Messinian sedimentary sequence from the overlaying Plio-Pleistocene sequence with a clear angular discordance, which almost completely masks possible earlier erosional events. The MES is present across the middle and upper slopes of the Sardinian margin and can be easily recognized down to the lower slope, where it interfingers with the Messinian evaporites which gradually thicken basinward.We propose a correlation between the main erosional surface of the lower slope and the salt layer recognized in the UU as a consequence of a falling stage during the last part of the MSCThe seismic profiles now available along the West Sardinian margin provide novel and crucial information to correlate the Messinian depositional units in the deep basin with those present in the lower continental slope and with the erosional surface of the middle and upper slopes. Our data and interpretation highlight the main units of the Messinian trilogy and further internal sequences that are probable related to cyclic fluctuations during their deposition.
机译：我们处理并解释了一个新采集的地球物理数据集（WS10项目），该数据集与老式地震剖面相集成，以研究萨尔多-普罗旺斯盆地撒丁岛被动边缘的演化。该研究领域最突出的特征是由墨西尼盐度危机（MSC）引起的，该危机在深海盆地中形成了厚厚的盐层。复杂的岩溶动力学构造使上层的墨西尼上层单元（UU）和上新世-第四纪（PQ）沉积物变形，有时还会使海底弯曲。 UU中的一种较细的本地盐表明，在MSC后期至少有一个较低的低位。完全掩盖了可能的早期侵蚀事件。 MES存在于撒丁岛边缘的中，上斜坡，可以容易地识别到下斜坡，并与墨西斯蒸发岩发生干涉，逐渐向盆地上增厚。我们提出了下斜坡的主要侵蚀面之间的相关性以及MSC末期由于下降阶段而在UU中识别出的盐层。现在，沿西撒丁岛边缘可获得的地震剖面提供了新颖而重要的信息，以将深盆地中的墨西尼沉积单元与该盆地中的沉积单元相关联。下大陆坡和中上坡的侵蚀面。我们的数据和解释突出了墨西拿三部曲的主要单元以及可能与沉积过程中的周期性波动有关的其他内部序列。

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