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首页> 外文期刊>Pure and Applied Geophysics >Sardinia Coastal Uplift and Volcanism
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Sardinia Coastal Uplift and Volcanism

机译：撒丁岛沿海隆升和火山活动

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摘要

The low variability of MIS 5.5 sea level (M.I.S = Marine Isotopic Stage) with respect to the present day sea level, allows the Sardinian coast to be used as an eustatic reference for the entire Mediterranean region. This level is generally at 7 +/- A 2 m above current sea level along the Sardinian coast. One sector along the Orosei Gulf (eastern Sardinia) includes a characteristic and well conserved tidal notch that changes in elevation from 7.6 to 11.5 m over only 30 km, tilting upwards towards the north. Generally, height deviations of such a tidal notch would be due to tectonic or volcanic activity. The Sardinia coast however, is considered to have too little tectonic activity, and also too small post-glacial rebound in order to explain the anomaly. The remaining possibility is Neogene-Quaternary continental and/or submarine volcanic activity, which we investigate as a possible cause for the observed anomalies. In this paper, our goal is to explain the anomaly by modelling recent volcanic loading or updoming related to magmatic intrusion emplacement. We review the literature on the recent volcanic deposits, both on-shore and off-shore, and investigate to what extent volcanic loads can influence the coastline from a theoretical standpoint, using the isostatic flexure model and a range of loads. We find that the observed notch height anomaly cannot be explained by volcanic loading, but must be produced by an upward welling due to the emplacement of volcanic material, as produced for instance by a laccolith or batholith. The upward movement could be related to the submarine volcano only recently detected, or to a source located on the eastern Sardinia coast near Orosei.
机译：MIS 5.5海平面（M.I.S =海洋同位素阶段）相对于当今海平面的低可变性，使撒丁岛海岸可以用作整个地中海地区的欣喜基准。该高度通常比撒丁岛沿岸的当前海平面高7 +/- A 2 m。奥罗塞海湾（撒丁岛东部）沿岸的一个区域包括一个特征性且保护良好的潮汐缺口，该海拔高度在仅30公里的范围内从7.6升高到11.5 m，向北倾斜。通常，这种潮汐缺口的高度偏差是由于构造或火山活动造成的。然而，撒丁岛海岸被认为构造活动太少，冰川后回弹也太小，以解释异常。剩下的可能性是新近纪第四纪大陆和/或海底火山活动，我们将其作为观察到异常现象的可能原因。在本文中，我们的目标是通过对近期与岩浆侵入位置有关的火山荷载或俯冲进行建模来解释异常。我们回顾了有关近期陆上和近海火山沉积的文献，并使用等静挠曲模型和一系列载荷，从理论的角度研究了火山载荷在多大程度上可以影响海岸线。我们发现，观察到的缺口高度异常不能用火山载荷来解释，而必须由于火山岩材料的放置而由向上的井涌产生，例如由漆岩或岩溶岩产生的。上升运动可能与最近才发现的海底火山有关，也可能与位于奥罗塞附近的撒丁岛东部海岸的一个震源有关。

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