Glacioeustatic control on the origin and cessation of the Messinian salinity crisis.
Glacioeustatic control on the origin and cessation of the Messinian salinity crisis.
复制标题
冰川稳定对墨西拿盐度危机的起源和结束的控制。
DOI：
10.1016/j.gloplacha.2013.08.008
复制
发表时间：
2013
影响因子：
3.9
通讯作者：
J. Civis
中科院分区：
文献类型：
--
作者：
J. Pérez;J. Aguirre;G. Jiménez;G. Schmiedl;J. Civis
地中海在墨西拿盐度危机（MSC）期间的干化是近代地球历史上最有趣的地质事件之一。然而，其发病和结束的时间，以及所涉及的机制仍然存在争议。我们提出了一种新的方法来解决这些问题，通过检查MSC从大西洋，但接近直布罗陀弧，分析完整的墨西拿记录的Montemayor-1核心的瓜达尔基维尔盆地（西南西班牙）。弯曲回剥分析显示，构造隆起的趋势，将大大减少深度的里夫安走廊。然而，构造抬升的速度不足以解释走廊的封闭。在5.97马，全球冷却和相关的冰川海平面下降，估计在60米，观察。这将足以限制Rifian邻居并触发MSC。后来地中海的洪水发生在稳定构造时期与全球变暖相关的海平面上升期间。我们假设一个两阶段的洪水事件：1）在间冰期阶段TG 11（5.52 Ma）的冰川海平面上升导致亚热带大西洋沃茨进入中西部地中海通过通道南部的直布罗陀海峡，可能是里菲亚走廊。2)全球海平面下降到5.4 Ma，这可能会加剧直布罗陀门槛处的退行性河流侵蚀，沿着随后的全球海平面上升，这将产生直布罗陀海峡，导致在上新世最早期完成地中海再填充。
The desiccation of the Mediterranean during the Messinian salinity crisis (MSC) is one of the most intriguing geological events of recent Earth history. However, the timing of its onset and end, as well as the mechanisms involved remain controversial. We present a novel approach to these questions by examining the MSC from the Atlantic, but close to the Gibraltar Arc, analysing the complete Messinian record of the Montemayor-1 core of the Guadalquivir Basin (SW Spain). Flexural backstripping analysis shows a tectonic uplift trend that would have reduced the depth of the Rifian Corridors considerably. Nonetheless, the rate of tectonic uplift was insufficient to account for the close up of the corridors. At 5.97 Ma, a global cooling and associated glacioeustatic sea-level drop, estimated in 60 m, is observed. This would have been sufficient to restrict the Rifian Corridors and to trigger the MSC. The later flooding of the Mediterranean occurred during a sea-level rise associated with global warming during a stable tectonic period. We postulate a two-step flooding event: 1) A glacioeustatic sea-level rise during interglacial stage TG 11 (5.52 Ma) led to subtropical Atlantic waters entering the west-central Mediterranean through pathways south of the Gibraltar Strait, probably the Rifian Corridors. 2) A global sea-level drop at 5.4 Ma, that might have favoured intensification of regressive fluvial erosion in the Gibraltar threshold, along with the subsequent global sea-level rise would have generated the Gibraltar Strait leading to complete Mediterranean refilling during the earliest Pliocene.