Erosion of continental margins in the Western Mediterranean due to sea-level stagnancy during the Messinian Salinity Crisis

Erosion of continental margins in the Western Mediterranean due to sea-level stagnancy during the Messinian Salinity Crisis
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墨西拿盐度危机期间海平面停滞导致西地中海大陆边缘侵蚀

DOI:
10.1007/s00367-010-0213-z
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发表时间:
2011
期刊:
影响因子:
2.1
通讯作者:
Reicherter
Reicherter
中科院分区:
地球科学4区
文献类型:
--
作者:
Hübscher;Betzler;Lüdmann;Reicherter

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在马略卡岛西南部、奥兰湾(阿尔及利亚)和阿尔博兰海脊附近有少量沉积物输入的大陆斜坡上的高分辨率多道地震数据显示,梅西尼亚侵蚀面在比今天海平面低320至380微米之间的几乎恒定的深度间隔内呈阶地状。据推测,这些数百到2000米宽的阶地是在同一时间被侵蚀的,基本上是在相同的深度。这些深度的今天差异是由个别领域的下沉或抬升造成的。这些阶地被认为是在西地中海盆地的一个或多个海平面停滞期演变而成的。根据几个已公布的情景,在梅西尼亚干化事件期间,出现了一个或多个相对海平面静止的时期,通常被称为梅西尼亚盐度危机。一些作者认为,这种停滞始于地中海盆地的再充填阶段。当海平面上升到西西里峡谷的高度时,水从这个涨潮溢出到东部盆地。这种停滞一直持续到东部盆地的海平面赶上地中海西部的水位。其他作者将海平面停滞期划分为下降阶段,此时来自大西洋的流入水使西西里峡谷深处的西部海平面保持不变。我们的发现证实了所有这些梅西里岛海平面重建的结果,即西西里海床深处的单个或多个海平面停滞持续的时间足够长,足以显著侵蚀上坡。我们的数据对正在进行的关于西西里峡谷古深度的辩论也有影响。由于马略坎高原经历了最小的垂直运动,据推测,那里观测到的380米的阶地深度接近这次膨胀的梅西尼亚深度。
High-resolution multi-channel seismic data from continental slopes with minor sediment input off southwest Mallorca Island, the Bay of Oran (Algeria) and the Alboran Ridge reveal evidence that the Messinian erosional surface is terraced at an almost constant depth interval between 320 and 380 m below present-day sea level. It is proposed that these several hundred- to 2,000-m-wide terraces were eroded contemporaneously and essentially at the same depth. Present-day differences in these depths result from subsidence or uplift in the individual realms. The terraces are thought to have evolved during one or multiple periods of sea-level stagnancy in the Western Mediterranean Basin. According to several published scenarios, a single or multiple periods of relative sea-level stillstand occurred during the Messinian desiccation event, generally known as the Messinian Salinity Crisis. Some authors suggest that the stagnancy started during the refilling phase of the Mediterranean basins. When the rising sea level reached the height of the Sicily Sill, the water spilled over this swell into the eastern basin. The stagnancy persisted until sea level in the eastern basin caught up with the western Mediterranean water level. Other authors assigned periods of sea-level stagnancy to drawdown phases, when inflowing waters from the Atlantic kept the western sea level constant at the depth of the Sicily Sill. Our findings corroborate all those Messinian sea-level reconstructions, forwarding that a single or multiple sea-level stagnancies at the depth of the Sicily Sill lasted long enough to significantly erode the upper slope. Our data also have implications for the ongoing debate of the palaeo-depth of the Sicily Sill. Since the Mallorcan plateau experienced the least vertical movement, the observed terrace depth of 380 m there is inferred to be close to the Messinian depth of this swell.
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