干旱区生态环境知识资源中心(Arid): Geochemistry of subsurface Late Quaternary ironstones in Rajshahi and Bogra Districts, Bangladesh: implications for genetic and depositional conditions

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DOI	10.1007/s11631-018-00310-0
	Geochemistry of subsurface Late Quaternary ironstones in Rajshahi and Bogra Districts, Bangladesh: implications for genetic and depositional conditions
	Rahman, Md. Sazzadur; Hossain, Ismail; Biswas, Pradip Kumar; Rahim, Md. Abdur; Hasan, A. S. M. Mehedi; Adham, Md. Ibrahim
通讯作者	Hossain, I
来源期刊	ACTA GEOCHIMICA
ISSN	2096-0956
EISSN	2365-7499
出版年	2019
卷号	38 期号:3 页码:404-413
英文摘要	The present study deals with the geochemistry of Late Quaternary ironstones in the subsurface in Rajshahi and Bogra districts, Bangladesh with the lithological study of the boreholes sediments. Major lithofacies of the studied boreholes are clay, silty clay, sandy clay, fine to coarse grained sand, gravels and sands with (fragmentary) ironstones. The ironstones contain major oxides, Fe2O3* (* total Fe) (avg. 66.6 wt%), SiO2 (avg. 15.3 wt%), Al2O3 (avg. 4.0 wt%), MnO (avg. 7.7 wt%), and CaO (avg. 3.4 wt%). These geochemical data imply that the higher percentage of Fe2O3* along with Al2O3 and MnO indicate the ironstone as goethite and siderite, which is also validated by XRD data. A comparatively higher percentage of SiO2 indicates the presence of relative amounts of clastic quartz and manganese-rich silicate or clay in these rocks. These ironstones also have significant amounts of MnO (avg. 7.7 wt%) suggesting their depositional environments under oxygenated condition. Chemical data of these ironstones suggest that the source rock suffered deep chemical weathering and iron was mostly carried in association with the clay fraction and organic matter. Iron concretion was mostly formed by bacterial build up in swamps and marshes, and was subsequently embedded in clayey mud. Within the coastal environments, the water table fluctuates and goethite and siderite with mud and quartz became dry and compacted to form ironstone.
英文关键词	Ironstone Geochemistry Goethite Siderite Bangladesh
类型	Article
语种	英语
收录类别	ESCI
WOS记录号	WOS:000465374500007
WOS关键词	WESTERN DESERT ; BENGAL BASIN ; MANGANESE ; MINERALOGY ; CHEMISTRY
WOS类目	Geochemistry & Geophysics
WOS研究方向	Geochemistry & Geophysics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/333501
作者单位	[Rahman, Md. Sazzadur; Hossain, Ismail; Adham, Md. Ibrahim] Univ Rajshahi, Dept Geol & Min, Rajshahi, Bangladesh; [Biswas, Pradip Kumar; Hasan, A. S. M. Mehedi] BCSIR, IMMM, Joypurhat, Bangladesh; [Rahim, Md. Abdur] Patuakhali Sci & Technol Univ, Dept Disaster Resilience & Engn, Dumki 8602, Patuakhali, Bangladesh
推荐引用方式 GB/T 7714	Rahman, Md. Sazzadur,Hossain, Ismail,Biswas, Pradip Kumar,et al. Geochemistry of subsurface Late Quaternary ironstones in Rajshahi and Bogra Districts, Bangladesh: implications for genetic and depositional conditions[J],2019,38(3):404-413.
APA	Rahman, Md. Sazzadur,Hossain, Ismail,Biswas, Pradip Kumar,Rahim, Md. Abdur,Hasan, A. S. M. Mehedi,&Adham, Md. Ibrahim.(2019).Geochemistry of subsurface Late Quaternary ironstones in Rajshahi and Bogra Districts, Bangladesh: implications for genetic and depositional conditions.ACTA GEOCHIMICA,38(3),404-413.
MLA	Rahman, Md. Sazzadur,et al."Geochemistry of subsurface Late Quaternary ironstones in Rajshahi and Bogra Districts, Bangladesh: implications for genetic and depositional conditions".ACTA GEOCHIMICA 38.3(2019):404-413.