Provenance and sediment dispersal in Pearl River Estuary, southern China unraveled by magnetic properties

IF 2.6 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Marine Geology Pub Date : 2024-11-07 DOI:10.1016/j.margeo.2024.107431

Mingkun Li , Yongying Zeng , Shanshan Liu , Meng Tang , Liang Chen , Jiyu Chen , Alessandro Amorosi , Tingping Ouyang

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Abstract

The Pearl River Estuary (PRE), with eight outlets supplied by multiple tributaries, is an excellent study area for reconstructing sediment provenance and transport pathways of a multi-sourced sediment-routing system. However, the sediment source to sink dispersal model is less well-known. This study aimed to estimate the PRE sediment budget by comparing the magnetic characteristics of estuarine surface sediments with those of all potential sources. In the bottom sediments of PRE and adjacent region, magnetic minerals, mainly magnetite and hematite, have a characteristic terrigenous signature. Source and sink comparison for magnetic parameters shows that the possible input of southwestern Taiwan rivers can be excluded, whereas the possibility of sediment contribution from nearby rivers, including Han, Rong, and Jiulong rivers, to the estuary could not be ruled out. Quantitative provenance analysis indicates that West River-sourced sediment dominates the western side of the estuary, the East River-sourced sediment is most important in the eastern side of the estuary, whereas sediment supplied by the North River is high only close to the outlets. A mixed-sediment contribution to the estuary is suggested, with a fluvial-dominated sediment input around the west river outlets and a tide-dominated sediment dispersal in the eastern side of the estuary. Overall, our study demonstrates the importance of fingerprinting changes in sediment supply using sediment magnetic properties and provides new insights into the PRE sediment-routing system.

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磁性揭示华南珠江口沉积物的成因和扩散规律

珠江口有 8 个出口，由多条支流提供泥沙，是重建多源泥沙迳流系统的泥沙来源和输移途径的绝佳研究区域。然而，沉积物从源到汇的扩散模型却鲜为人知。本研究旨在通过比较河口表层沉积物与所有潜在来源沉积物的磁性特征来估算 PRE 的沉积物预算。在 PRE 及其邻近地区的底层沉积物中，磁性矿物（主要是磁铁矿和赤铁矿）具有典型的陆相特征。磁性参数的源汇比较表明，可以排除台湾西南部河流输入的可能，但不排除附近河流（包括汉江、榕江和九龙江）向河口输入沉积物的可能性。定量来源分析表明，河口西侧主要是西河泥沙，河口东侧主要是东河泥沙，而北河泥沙仅在河口附近较多。研究表明，河口的沉积物来源是混合的，西河出口附近的沉积物输入以河流为主，而河口东侧的沉积物则以潮汐为主。总之，我们的研究证明了利用沉积物磁性特征来确定沉积物供应变化的重要性，并为研究河口沉积物流向系统提供了新的视角。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

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.