Nonnegligible contribution of terrigenous sediment inputs from local small watersheds to west regions of the Pearl River Estuary, northern South China Sea shelf

IF 2.6 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Marine Geology Pub Date : 2024-08-02 DOI:10.1016/j.margeo.2024.107369

Chenjian He , Tingping Ouyang , Mingkun Li , Shanying Zhu , Mingjie Yu , Shasha Peng , Zhaoyu Zhu , Yunpeng Wang , Hongjun Chen , Chengjing Tian

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引用次数: 0

Abstract

As a crucial “sink” for terrigenous material entering the ocean, provenance of sediments within the coastal zone and continental shelf sea regions holds significant scientific importance in the investigation of global material cycling. Environmental magnetism was proved as an effective and rapid approach for sediment source identification. Detail and systematic magnetic measurements were performed for surface sediment samples collected from the mega Pearl River, local small rivers (Tan, Moyang and Jian rivers) of west Guangdong, coastal zone (CZ) and continental shelf (CS) to analyze the contribution of local small watersheds to marine sediments. The results indicate that detrital river input magnetite and hematite are coexisted in both CZ and CS sediments. Compared to CZ sediments, relatively higher concentration of hematite and finer grain size of magnetite are appeared at CS sediments. By comparing of magnetic parameters, it was inferred that magnetic minerals from the Pearl and Tan rivers are transported and deposited on the coastal zone by Guangdong longshore current. Meanwhile, sediment magnetic parameters in the Moyang and Jian Rivers are similar to the CS sediments, implying the two rivers-sourced materials were directly transported and deposited at the CS due to their narrow and restricted estuaries, and/or the CS preserves the residual deposits from the two rivers formed during the Last Glacial. Except for the Pearl River, sources of local small rivers significantly contribute to marine sediments at the coastal zone and continental shelf.

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南海北部陆架珠江口西部地区局部小流域的陆源沉积物输入的不可忽略贡献

作为进入海洋的土著物质的重要 "汇"，沿岸带和大陆架海区沉积物的来源在研究全球物质循环方面具有重要的科学意义。环境磁学被证明是一种有效而快速的沉积物来源识别方法。对从特大珠江、粤西局部小河流（潭江、漠阳江和鉴江）、海岸带（CZ）和大陆架（CS）采集的表层沉积物样品进行了详细和系统的磁学测量，以分析局部小流域对海洋沉积物的贡献。结果表明，河流输入的磁铁矿和赤铁矿在 CZ 和 CS 沉积物中共存。与 CZ 沉积物相比，CS 沉积物中赤铁矿浓度相对较高，磁铁矿粒度较细。通过磁性参数的比较，可以推断珠江和潭江中的磁性矿物是由广东长岸流搬运沉积到海岸带的。与此同时，漠阳江和鉴江的沉积物磁性参数与 CS 沉积物相似，这意味着这两条河流的物质由于河口狭窄和受限而被直接搬运并沉积在 CS，或者 CS 保存了这两条河流在末次冰川时期形成的残余沉积物。除珠江外，当地小河流的源头对海岸带和大陆架的海洋沉积物贡献很大。

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.