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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >The formation of giant clastic extrusions at the end of the Messinian Salinity Crisis
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The formation of giant clastic extrusions at the end of the Messinian Salinity Crisis

机译：在Messinian盐度危机结束时形成巨型碎屑挤压

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AbstractThis paper documents the discovery of five multi-km scale lensoid bodies that directly overlie the upper surface of the thick (>1 km) Messinian Evaporite sequence. They were identified through the analysis of 3D seismic data from the western Nile Cone. The convergence of the upper and lower bounding reflections of these lensoid bodies, their external and internal reflection configuration, the positive ‘depositional’ relief at their upper surface, and the stratal relationship with underlying and overlying deposits supports the interpretation that these are giant clastic extrusions. The interpretations combined with the stratal position of these clastic extrusions demonstrate a prior unsuspected link between periods of major environment change and basin hydrodynamics on a plate scale.All five lensoid bodies were extruded onto a single, seismically resolvable marker horizon correlatable with the end of the Messinian Salinity Crisis (Horizon M). It is argued that the source of these clastic extrusions is pre-Messinian in origin, which implies massive sediment remobilisation at depth in the pre-evaporitic succession and intrusion through the thick evaporite layer. We propose that the scale and timing of this dramatic event was primed and triggered by near-lithostatic overpressure in the pre-evaporitic sediments generated through (1) their rapid burial and loading during the Messinian Salinity Crisis and (2) catastrophic re-flooding during its immediate aftermath.The largest of these clastic extrusions has a volume of over c. 116 km3, making it amon
机译：<！[cdata [ Abstract 本文记录了五个多km秤位的发现，直接覆盖了厚（> 1 km）Messinian蒸发序列的上表面。通过分析来自西尼罗锥的3D地震数据来确定它们。这些透明体体的上下边界反射的收敛性，外部和内部反射配置，其上表面上的正面“沉积”释放以及与底层和覆盖沉积物的划分关系支持这些是巨大的碎屑挤出的解释。与这些碎屑挤出的划分相结合的解释表明了在板秤上的主要环境变化和盆地流体动力学时期之间的先前未缺点的联系。 所有五个流星拓机构都被挤出到一个地下可解析的标记范围内，与Messinian盐度危机（Horizo​​ n M）结束相关。认为这些碎屑挤出的来源是原点前的Messinian，这意味着在预蒸发的继承和侵入通过厚的蒸发层的侵入中的大量沉积物。我们建议在蒸发前沉积物的近似岩石沉积物中引发和触发这种戏剧事件的规模和时间，通过（1）在Messinian盐度危机期间的快速埋葬和装载，（2）灾难性重新洪水它的即时之后。 这些碎片挤出的最大型在C上有一个体积。 116 km 3 ，使其成为amon

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