潘泰勒里亚火山的海底形态:受海平面波动影响的火山和侵蚀沉积过程之间的相互作用。

IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Marine Geology Pub Date : 2024-05-17 DOI:10.1016/j.margeo.2024.107308
Daniele Casalbore , Claudia Romagnoli , Marilena Calarco , Alessandro Bosman , Eleonora Martorelli , Francesco Latino Chiocci
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引用次数: 0

摘要

高分辨率多波束数据与地震反射剖面相结合,用于识别和描述位于西西里海峡的潘泰勒里亚活火山海底部分(约 80%)的主要原生火山和侵蚀沉积特征。火山地貌包括熔岩流、火山锥和拉长的山脊。熔岩流主要分布在岛屿大陆架上,而火山锥和火山脊则主要集中在陡峭的海底侧翼,尤其是较宽的东南和西北侧翼。火山锥和火山脊的形成与强烈的火山-构造相互作用有关,这体现在火山锥和火山脊沿着(主要)东南-西北和(次要)西南-东北两个方向优先伸长或排列,这两个方向控制了整个火山大厦的演变。侵蚀沉积特征主要包括影响岛屿陆架边缘和上覆海底沉积阶地的小规模滑坡疤痕和狭窄沟壑。沟壑有时会向下汇合成较大的水道,其形成主要受火山地貌和/或不同年龄或岩性特征的陆架区段分布的控制。根据潘泰勒利亚火山不同侧翼之间明显的形态差异,我们推断火山活动随着时间的推移从东南向西北整体迁移。这种迁移显然与西北海岛陆架比东南陆架更宽但更浅的现象形成鲜明对比。这种反常现象可以通过一个两阶段模型来解释,即在西北部形成了一个多源大陆架,在上一个震旦纪半周期期间,火山活动使其恢复了活力。岛屿周围海岛陆架边缘的不同深度也为了解晚第四纪期间影响潘泰勒利亚火山的垂直变形提供了线索。
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Submarine morphology of Pantelleria volcano: The interplay between volcanic and erosive-depositional processes modulated by sea-level fluctuations.

High-resolution multibeam data integrated with seismic reflection profiles are used to identify and characterize the main primary volcanic and erosive-depositional features along the submarine part (about the 80%) of the active Pantelleria volcano located in the Sicily Channel. Volcanic features include lava flows, cones and elongated ridges. Lava flows are mainly recognized over the insular shelf, while volcanic cones and ridges are mostly concentrated along the steep submarine flanks, especially along the wider SE and NW ones. A strong volcano-tectonic interaction is envisaged for their formation, as indicated by their preferential elongation or alignment along the (main) SE-NW and (secondary) SW-NE directions that have controlled the evolution of the whole volcanic edifice. Erosive-depositional features mainly include small-scale landslide scars and narrow gullies affecting the edge of the insular shelf and overlying submarine depositional terraces. Gullies sometimes merge downslope in larger channels, whose formation is primarily controlled by the distribution of volcanic features and/or shelf sectors characterized by different age or lithologies. Based on the marked morphological differences between the different flanks of the Pantelleria volcano, we infer an overall migration of the volcanic activity from SE to NW over time. This migration is apparently in contrast with the presence of a much wider but shallower NW insular shelf with respect to the SE one. This anomaly can be explained through a two-stage model, with the formation, in the NW sector, of a polygenic shelf rejuvenated by volcanic progradation during the last eustatic hemicycle. The different depths of the insular shelf edge around the island also provide insights on vertical deformations that affected the Pantelleria volcano during the Late-Quaternary.

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来源期刊
Marine Geology
Marine Geology 地学-地球科学综合
CiteScore
6.10
自引率
6.90%
发文量
175
审稿时长
21.9 weeks
期刊介绍: Marine Geology is the premier international journal on marine geological processes in the broadest sense. We seek papers that are comprehensive, interdisciplinary and synthetic that will be lasting contributions to the field. Although most papers are based on regional studies, they must demonstrate new findings of international significance. We accept papers on subjects as diverse as seafloor hydrothermal systems, beach dynamics, early diagenesis, microbiological studies in sediments, palaeoclimate studies and geophysical studies of the seabed. We encourage papers that address emerging new fields, for example the influence of anthropogenic processes on coastal/marine geology and coastal/marine geoarchaeology. We insist that the papers are concerned with the marine realm and that they deal with geology: with rocks, sediments, and physical and chemical processes affecting them. Papers should address scientific hypotheses: highly descriptive data compilations or papers that deal only with marine management and risk assessment should be submitted to other journals. Papers on laboratory or modelling studies must demonstrate direct relevance to marine processes or deposits. The primary criteria for acceptance of papers is that the science is of high quality, novel, significant, and of broad international interest.
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