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- W2068471308 abstract "Sedimentary structures on the Bengal shelf are examined using X-radiographic, thin-section, and scanning-electron-microscopic (SEM) techniques, which reveal contrasting depositional processes for the inner and middle shelf as well as for either side of a major submarine canyon indenting the western shelf margin. The inner shelf is characterized by tidally produced interlaminated silts and muds that reveal a neap-spring cyclicity. The cyclicity is more pronounced for the winter season, when high-discharge/monsoon conditions do not obscure the tidal signature. On the middle shelf, alternating beds of silts and muds probably represent high-discharge and low-discharge conditions, respectively. Silty beds on the western margin of the submarine canyon are thinner than those found on the eastern margin. The western margin receives predominantly fine-grained Ganges sediments, in contrast to the eastern area which receives both Ganges and coarser Brahmaputra sediments; these observations indicate that the submarine canyon presently intercepts westward along-shelf sediment transport. Muddy beds and laminae that appear internally homogeneous in the X-radiographs and exhibit faint bedding in thin sections often are composed of resistant (protruding) and less-resistant (recessed) microlaminae as observed with the SEM. On the inner shelf, resistant microlaminae are composed of fine-grained polymineralic, equant particles. The less-resistant microlaminae are composed of large, platy illite grains rimmed by smaller platy or lath-like illite particles. Resistant and less-resistant microlaminae within middle-shelf muddy sediments have the same textural characteristics observed on the inner shelf; however, both types essentially are monomineralic. On the middle shelf the smallest particles within the less-resistant microlaminae exhibit an open flocculated structure that may result from higher salinity, and/or decreased bottom shear stress associated with tidal currents. Biological structures predominantly occur on the western inner and middle shelf, particularly in intervals of high smectite concentrations. This relationship may exist because of a preferential organic affinity for expandable minerals, providing a favorable substrate for benthic organisms." @default.
- W2068471308 created "2016-06-24" @default.
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- W2068471308 date "1994-11-01" @default.
- W2068471308 modified "2023-10-18" @default.
- W2068471308 title "Sedimentary structures on the Bengal shelf: a multi-scale approach to sedimentary fabric interpretation" @default.
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- W2068471308 doi "https://doi.org/10.1016/0037-0738(94)90003-5" @default.
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