Holocene palaeoenvironmental development of Prokljan Lake (Krka River, Croatia): Evolution from a calcareous tufa barrier system to a karst estuary

IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Marine Geology Pub Date : 2024-08-06 DOI:10.1016/j.margeo.2024.107370
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Abstract

The upstream part of the karst estuary of the Krka River (Prokljan Lake) on the Eastern Adriatic Coast was studied by combining high-resolution seismic data, analyses on sediment cores, and radiocarbon dating to reconstruct the late Quaternary stratigraphy of the estuary. The sedimentary infill consists of up to 20 m of freshwater and estuarine deposits divided into four seismostratigraphic units corresponding to several stages of development since the last glacial period. The lowstand stage is assumed to correspond to fluvial incision and sediment bypass associated with glacial periods. The postglacial transgressive stage is marked by the growth of calcareous tufa barriers and fluvio-lacustrine deposition. The onset of marine influence in the estuary (Prokljan Lake) was recorded at the beginning of the Holocene (>10,500 cal y BP) with the deposition of brackish sediments with a strong freshwater influence. Calcareous tufa barriers prevented direct rapid flooding of Prokljan Lake in the period from >10,500 cal y to ∼7200 cal y BP. Finally, the transgressive brackish deposition changed to estuarine/marine highstand deposition in a salt-wedge estuary during the late Holocene (∼4000–3000 cal y BP). The late Quaternary deposition in this unique karst setting showed dramatic changes. It was primarily influenced by rapid sea-level rise, climate changes, estuarine geomorphology and relatively low sediment supply.

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Prokljan 湖(克罗地亚克尔卡河)全新世古环境发展:从钙质页岩屏障系统到岩溶河口的演变
通过结合高分辨率地震数据、沉积物岩心分析和放射性碳年代测定,对东亚得里亚海沿岸克尔卡河(普罗克连湖)岩溶河口上游部分进行了研究,以重建河口第四纪晚期地层。沉积填充物由长达 20 米的淡水和河口沉积物组成,分为四个地震地层单元,分别对应上一个冰川期以来的几个发展阶段。低地阶段被假定为与冰川期相关的河道内切和沉积物绕流阶段。冰川期后的横切阶段的特征是钙质页岩壁垒的生长和河流-湖泊沉积。河口(普罗克连湖)开始受到海洋的影响是在全新世初期(大于 10,500 卡年 BP),咸水沉积物的沉积带有强烈的淡水影响。在大于 10,500 卡年至公元前 7,200 卡年期间,石灰质页岩屏障阻止了普罗克连湖直接快速泛滥。最后,在全新世晚期(公元前 4000-3000 年),横向咸水沉积转变为盐边河口的河口/海洋高地沉积。在这一独特的岩溶环境中,第四纪晚期的沉积发生了巨大变化。它主要受到海平面快速上升、气候变化、河口地貌和相对较少的沉积物供应的影响。
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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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