阿德拉三角洲水下系统(北阿尔博兰海)全新世晚期的演变:千年尺度气候和人类活动影响的地震地层学和地貌学证据

IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
P. Bárcenas , F.J. Lobo , L.M. Fernández-Salas , I. Mendes , N. López-González , J. Macías
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引用次数: 0

摘要

通过对高分辨率地震剖面网络进行主要地震地层学解释,结合多种测深数据(包括多波束测深图像),并与使用振动凿岩机采集的浅层沉积物岩心进行核对,研究了地中海小型三角洲系统的形成与发展。阿德拉河海底三角洲分为一个基底斑状地震单元和五个楔形较年轻地震单元,这些单元与全新世高地稳定有关。有限的年龄控制表明,最上层的两个地震单元是近期形成的,很可能与河道偏离和沉积物滞留导致的河道流量匮乏有关。在伊比利亚东南部逐渐干旱化的大背景下,三个较早地震单元的形成与全新世中期、全新世晚期和小冰河时期的三个潮湿时期相关联。单个地震单元的堆积模式和空间分布记录了连续前三角洲裂片的偶发性渐进历史,以及由气候引起的流域变化和最近的人为干预所促成的长期演变。总体而言,水下三角洲系统记录了三角洲系统从以河流为主的三角洲到最近以波浪为主的楔形三角洲的完整演变过程。在这两者之间,三角洲系统呈现出一种渐进的不对称特征,这是由于陆架上大西洋水域的注入及其随后的向东重新分布造成的。阿德拉三角洲系统是小型三角洲系统的一个杰出范例,它几乎立即对系统的自然变化和排水流域的人为干预之间的复杂互动做出反应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Late Holocene evolution of the Adra Delta subaqueous system (Northern Alboran Sea): Seismic-stratigraphic and geomorphic evidence of millennial scale climatic and anthropic effects

The formation and development of a small Mediterranean deltaic system are investigated through a primary seismic stratigraphic interpretation of a high-resolution seismic profile network, combined with multiple bathymetric data (including multibeam bathymetric imagery) and collated with shallow sediment cores collected with a vibro-corer device.

The submarine delta of the Adra River is divided into a basal patchy seismic unit and five wedge-shaped younger seismic units that are related to the Holocene highstand stabilization. Limited age control indicates that the two uppermost seismic units are very recent, most likely related to a dearth of fluvial fluxes led by channel deviations and by sediment retention. The formation of the three older seismic units is correlated to three humid periods during the Middle Holocene, Late Holocene and Little Ice Age, under a general context of progressive aridification of southeastern Iberia.

The stacking patterns and spatial distribution of individual seismic units document a history of episodic progradation of successive prodeltaic lobes, with a long-term evolution mediated by climatically-induced changes in the river basin and more recent anthropogenic interventions. Overall, the subaqueous deltaic system registers the complete modification of a deltaic system that evolves from a fluvial-dominated delta to recent wave-dominated wedges. In between, the deltaic system exhibits a progressive asymmetric character, due to the instauration of Atlantic waters on the shelf and their subsequent eastward redistribution. The Adra deltaic system is proposed as an outstanding example of a small deltaic system that reacts almost immediately to the complex interaction between natural changes in the system and anthropogenic interventions in the drainage basin.

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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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