Quaternary marine deposits of the Ischia Island have been analyzed based on marine geological survey and sedimentological data. The Ischia Island represents the emerged part of a large volcanic field, extending from the Procida island to the submerged volcanoes of the western Ischia offshore. The volcanic field develops over an area of about 42 km 2 , E-W trending, composed of calderas, such as the Ischia caldera, linked to the great explosive eruptions, plinian and ignimbritic (“Sintema del Rifugio di S. Nicola”). The grain-size analyses of sea bottom samples have shown that gravelly sands, sands, silty sands, muddy sands, sandy silts, and silts all occur. The comparison of the obtained results with previous sedimentological data collected in the Ischia offshore, coupled with the construction of marine geological maps at the 1:10,000 scale, has shown that sands seem to prevail in the eastern Ischia offshore, while gravelly sands, mainly bioclastic, are located at the top of relict volcanic edifices, such as the Forio Bank (western Ischia offshore) and the Ischia Bank (south-eastern Ischia offshore). Moreover, the obtained data show that rhodolith beds occur on the relict volcanic edifice of the Ischia Bank, on the related parasitic vent, and in the Ischia Channel, a morphological saddle located between the Ischia and Procida islands.

中文翻译：

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伊斯基亚岛（意大利南部第勒尼安海那不勒斯湾）第四纪海洋沉积物的新沉积学、海岸和海洋地质数据

根据海洋地质调查和沉积学资料，对伊斯基亚岛第四纪海相沉积进行了分析。伊斯基亚岛代表了一个大型火山场的出现部分，从普罗奇达岛延伸到伊斯基亚岛西部近海的水下火山。火山场在约 42 km 2 的区域内发育，呈东西向，由火山口组成，例如与大爆炸性喷发、普林期和火山喷发相关的伊斯基亚火山口（“Sintema del Rifugio di S. Nicola”）。海底样品粒度分析表明，均存在砾质砂、砂质、粉质砂质、泥质砂质、砂质粉砂质和粉砂质。将获得的结果与以前在伊斯基亚近海收集的沉积学数据进行比较，再加上 1:10,000 比例尺的海洋地质图的构建，已经表明沙子似乎在东伊斯基亚近海占主导地位，而砾石砂，主要是生物碎屑，位于残存火山建筑物的顶部，例如 Forio 银行（伊斯基亚近海）和伊斯基亚银行（伊斯基亚近海的东南部） ）。此外，获得的数据表明，红石床出现在伊斯基亚海岸的遗迹火山建筑物、相关的寄生喷口上以及位于伊斯基亚和普罗奇达岛之间的形态鞍座的伊斯基亚海峡中。