Chemical, mineralogical, and physicochemical features of surface saline muds from Southwestern sub-basin of the East Vietnam Sea: Implication for new peloids

Luong Le Duc; Hoang Nguyen; Ryuichi  Shinjo; Renat  B. Shakirov; Anatoly  Obzhirov

doi:10.15625/2615-9783/16561

Author affiliations

Authors

Le Duc Luong 1-Institute of Geological Sciences, VAST, Hanoi, Vietnam; 2-Graduate University of Science and Technology, VAST, Hanoi, Vietnam
Nguyen Hoang 1-Institute of Geophysics, VAST, Hanoi, Vietnam; 2-Graduate University of Science and Technology, VAST, Hanoi, Vietnam
Ryuichi Shinjo Department of Physics and Earth Sciences, University of the Ryukyus, Senbaru 1, Nishihara, Okinawa 903-0213, Japan
Renat B. Shakirov V.I. Il'ichev Pacific Oceanological Institute, Far Eastern Branch of Russian Academy of Sciences, Vladivostok, 690041 Russian Federation
Anatoly Obzhirov V.I. Il'ichev Pacific Oceanological Institute, Far Eastern Branch of Russian Academy of Sciences, Vladivostok, 690041 Russian Federation

DOI:

https://doi.org/10.15625/2615-9783/16561

Keywords:

East Vietnam Sea, peloid, mud, total organic carbon, pH, cation exchange capacity

Abstract

This study presents the chemical, mineralogical and physicochemical features of 8 saline mud samples from 8 gravity cores located in the southwestern sub-basin of the East Vietnam Sea. The grain-size analysis of mud samples reveals the amount of clay and silt particles in the ranges of 65.1-89.2% and 9.5-34.2%, respectively and a very low fraction of sand. The analytical results showed that mud samples have high contents of SiO₂ (32.79-48.09%), Al₂O₃ (11.26-13.63%), CaO (3.10-13.93%), Fe₂O₃ (4.15-9.45%), and low contents of TiO₂, MnO, MgO, Na₂O, K₂O and P₂O₅. The XRD analysis of mud samples indicated mineral compositions with major minerals of quartz, illite, calcite, chlorite, feldspar, kaolinite, and other minor minerals like halite, smectite, fluorapatite, pyroxene, amphibole. The organic and physicochemical parameters of mud samples were also measured. Potentially toxic elements in mud samples were determined and compared with reference values and the technical standard. This study proposes that saline mud samples from the studied area are potential peloids.

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