Grain-size distribution characteristics of sediments in coastal shallow waters from Van Don to Tien Yen - Ha Coi, Northwest Gulf of Tonkin, Vietnam, according to End-member modelling analysis

Duc Anh Le; Duc Dong Mai; Thi Thuy Huong Tran; Duc Luong Le; Nhu Trung Nguyen; Hai Dang Vu; Van Nam Bui; Thu Hien Pham; Van Hao Duong; Anh Minh Nguyen

doi:10.15625/1859-3097/18898

Author affiliations

Authors

Le Duc Anh Institute of Marine Geology and Geophysics, VAST, Vietnam https://orcid.org/0000-0002-3423-3086
Mai Duc Dong Institute of Marine Geology and Geophysics, VAST, Vietnam
Tran Thi Thuy Huong Institute of Marine Geology and Geophysics, VAST, Vietnam
Le Duc Luong Institute of Geological Sciences, VAST, Vietnam https://orcid.org/0009-0005-8706-0288
Nguyen Nhu Trung Institute of Marine Geology and Geophysics, VAST, Vietnam https://orcid.org/0000-0002-6942-8502
Vu Hai Dang Institute of Marine Geology and Geophysics, VAST, Vietnam https://orcid.org/0009-0000-8159-4979
Bui Van Nam Institute of Marine Geology and Geophysics, VAST, Vietnam
Pham Thu Hien Institute of Marine Geology and Geophysics, VAST, Vietnam
Duong Van Hao VNU School of Interdisciplinary Studies, Vietnam National University, Hanoi, Vietnam
Nguyen Anh Minh UWC Changshu China, No. 88 Kun-Cheng-Hu-Xi Road, Changshu, Jiangsu, China

DOI:

https://doi.org/10.15625/1859-3097/18898

Keywords:

Grain-size, end-member modelling analysis, linear discriminate function, Gulf of Tonkin.

Abstract

The study involved the collection of eighteen surface sediment samples from the coastal shallow water area from Van Don to Tien Yen - Ha Coi in the Northwestern section of the Gulf of Tonkin to analyze their particle size composition. Utilizing the EMMAgeo end-member analysis model, four characteristic particle sizes (4EM) of 0.34, 7.7, 130, and 230 µm, corresponding to clay, fine silt, and fine sand of varying sizes were identified. In conjunction with the sedimentary environment, the spatial distribution analysis of these end members allowed a detailed determination of the formation conditions and distribution of the sediment components. Clay deposits (EM1) are primarily intercalated between the islands. At the same time, fine silt (EM2) is concentrated in the northern part of the study area, transported by flows, and deposited in a low-energy environment. Fine sand sediments (EM3 and EM4) are distributed along the coast of the Van Don peninsula in the Southern part of the study area and likely formed in association with tidal-wave processes under higher energy conditions compared to the North.

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