Clay mineral compositions in surface sediments of the Ganges-Brahmaputra-Meghna river system of Bengal Basin, Bangladesh

doi:10.1016/j.margeo.2019.03.007

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 中科院边缘海地质重点实验室

	Clay mineral compositions in surface sediments of the Ganges-Brahmaputra-Meghna river system of Bengal Basin, Bangladesh
	Rahman, Ananna 3; Cao, Li 3; Seddique, Ashraf Ali 1; Liu, Shengfa 2,4; Liu, Jianguo 2; Khan, Md Hafijur Rahaman 3
刊名	MARINE GEOLOGY
	2019
卷号	412 页码:27
关键词	Clay minerals Surface sediments Bengal Basin Ganges-Brahmaputra River system
ISSN号	0025-3227
DOI	10.1016/j.margeo.2019.03.007
英文摘要	Clay minerals are significant indicators that can be used to identify sources and transport patterns of both fluvial and marine sediments. The Ganges, Brahmaputra, and Surma-Meghna (SM) rivers are the most important rivers of the Bengal Basin (BB), loading a large amount of sediments from the Himalayas into the Bay of Bengal. Clay minerals of 132 surface sediment samples from the Ganges-Brahmaputra-Meghna (GBM) river system have been analyzed with X-ray diffraction (XRD) to show the variation of clay mineral assemblages in the sediments from upstream to downstream for the major rivers of the BB and to verify the validity of clay minerals as an important index for sediment provenance in the Bay of Bengal after these sediments are discharged into the neighboring seas. The results show that the clay mineral assemblage in the GBM river system consists dominantly of illite (average 66%), with smaller amounts of smectite, kaolinite, and chlorite (8%, 8%, and 17%, respectively). Smectite is diagnostic in the Ganges River sediments, with a higher content (23%) than that in the Brahmaputra (2%) and the SM River (1%); however, chlorite (21%) is high in the SM River sediments and the Brahmaputra River sediments have a high illite percentage (77%). Downstream, the smectite percentages in the Ganges River increase significantly, but the kaolinite percentages in sediments of the SM River increase slightly. Due to the continuous mixture of first the Brahmaputra River and then the SM River discharge, the clay mineral assemblages of this river system's sediments change greatly, e.g., smectite percentages decrease from 23% in the Ganges River to 8% in the GBM River via the stretch with 12% in the Ganges-Brahmaputra confluence river.
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/17953]
专题	南海海洋研究所_中科院边缘海地质重点实验室
作者单位	1.Minist Nat Sources, Inst Oceanog 1, Qingdao 266061, Shandong, Peoples R China 2.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Shandong, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Jatiya Kabi Kazi Nazrul Islam Univ, Dept Environm Sci & Engn, Trishal 2220, Mymensingh, Bangladesh
推荐引用方式 GB/T 7714	Rahman, Ananna,Cao, Li,Seddique, Ashraf Ali,et al. Clay mineral compositions in surface sediments of the Ganges-Brahmaputra-Meghna river system of Bengal Basin, Bangladesh[J]. MARINE GEOLOGY,2019,412:27, 36.
APA	Rahman, Ananna,Cao, Li,Seddique, Ashraf Ali,Liu, Shengfa,Liu, Jianguo,&Khan, Md Hafijur Rahaman.(2019).Clay mineral compositions in surface sediments of the Ganges-Brahmaputra-Meghna river system of Bengal Basin, Bangladesh.MARINE GEOLOGY,412,27.
MLA	Rahman, Ananna,et al."Clay mineral compositions in surface sediments of the Ganges-Brahmaputra-Meghna river system of Bengal Basin, Bangladesh".MARINE GEOLOGY 412(2019):27.