干旱区生态环境知识资源中心(Arid): Geochemistry of Recent Brahmaputra River Sediments: Provenance, Tectonics, Source Area Weathering and Depositional Environment

Arid

DOI	10.3390/min10090813
	Geochemistry of Recent Brahmaputra River Sediments: Provenance, Tectonics, Source Area Weathering and Depositional Environment
	Rahman, Md Aminur; Das, Sudeb Chandra; Pownceby, Mark I.; Tardio, James; Alam, Md Sha; Zaman, Mohammad Nazim
通讯作者	Rahman, MA
来源期刊	MINERALS
EISSN	2075-163X
出版年	2020
卷号	10 期号:9
英文摘要	Sediments from stable sand bars along a 40 km section of the Brahmaputra River in northern Bangladesh were analyzed for their major, trace and rare earth element contents to determine their provenance, compositional maturity, source area weathering and tectonic setting. Geochemically, the sediments were classified as litharenites and the Index of Compositional Variability (ICV) varied between 1.4 and 2.0, indicating low compositional and mineralogical maturity. A high mean SiO(2)concentration (72.9 wt.%) and low Al2O3(11.1 wt.%) were consistent with a low abundance of shale and clay components. The depletion of the oxide components Na2O, CaO and K2O relative to average upper crustal compositions (UCC) reflected loss of feldspar during chemical weathering in the source region. Average TiO(2)values for most samples were higher than average crustal levels, consistent with the northern section of the Brahmaputra River being a potential resource for valuable Fe-Ti oxide heavy minerals. Major and trace element ratios indicated the sediments represented erosional products from typical felsic upper continental crustal materials with contamination (30%-40%) from more intermediate/mafic compositions. The rare earth element patterns showed negative Eu anomalies (0.57-0.71), indicating they were derived mainly from fractionated felsic rocks. Resemblance of the sediment compositions to mean compositions from Higher Himalaya crystalline rocks pointed to these being potential source rocks but with components from a mafic source also present. Major element chemistries and low to intermediate weathering indices for all sediments indicated a lack of substantial chemical weathering. Evidence from tectonic discrimination diagrams suggested the Brahmaputra River sediments were derived from rock types that formed in a transitional tectonic setting ranging from an ancient passive margin to an active continental margin. Deposition occurred under cool to semi-arid climatic conditions in an oxic environment.
英文关键词	Brahmaputra River fluvial sediments sedimentary geochemistry provenance chemical maturity
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000580291500001
WOS关键词	SANDSTONE-MUDSTONE SUITES ; PENNSYLVANIAN-PERMIAN AGE ; BENGAL BASIN ; BANGLADESH PROVENANCE ; CRUSTAL EVOLUTION ; REDOX CONDITIONS ; GANGA RIVER ; ROCKS ; TRACE ; SHALES
WOS类目	Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
WOS研究方向	Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
来源机构	Commonwealth Scientific and Industrial Research Organisation
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326950
作者单位	[Rahman, Md Aminur; Tardio, James] RMIT Univ, Ctr Adv Mat & Ind Chem CAMIC, Sch Appl Sci, Melbourne, Vic 3001, Australia; [Rahman, Md Aminur; Das, Sudeb Chandra; Alam, Md Sha; Zaman, Mohammad Nazim] Bangladesh Council Sci & Ind Res BCSIR, Inst Min Mineral & Met IMMM, Sci Lab Rd, Khonjonpur 5900, Joypurhat, Bangladesh; [Rahman, Md Aminur; Pownceby, Mark I.] CSIRO Mineral Resources, Clayton, Vic 3169, Australia; [Das, Sudeb Chandra] Bangladesh Atom Energy Commiss, Inst Nucl Minerals, Dhaka 1207, Bangladesh
推荐引用方式 GB/T 7714	Rahman, Md Aminur,Das, Sudeb Chandra,Pownceby, Mark I.,et al. Geochemistry of Recent Brahmaputra River Sediments: Provenance, Tectonics, Source Area Weathering and Depositional Environment[J]. Commonwealth Scientific and Industrial Research Organisation,2020,10(9).
APA	Rahman, Md Aminur,Das, Sudeb Chandra,Pownceby, Mark I.,Tardio, James,Alam, Md Sha,&Zaman, Mohammad Nazim.(2020).Geochemistry of Recent Brahmaputra River Sediments: Provenance, Tectonics, Source Area Weathering and Depositional Environment.MINERALS,10(9).
MLA	Rahman, Md Aminur,et al."Geochemistry of Recent Brahmaputra River Sediments: Provenance, Tectonics, Source Area Weathering and Depositional Environment".MINERALS 10.9(2020).