Geochemistry of bed and suspended sediment in the Mississippi river system: Provenance versus weathering and winnowing

Science of Total Environment
By: , and 

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Abstract

Stream-bed sediment for the size fraction less than 150 μm, examined in 14,000 samples collected mostly from minor tributaries to the major rivers throughout the Mississippi River drainage system, is composed of 5 mineral fractions identified by factor analysis—Al-silicate minerals, quartz, calcite and dolomite, heavy minerals, and an Fe–Mn fraction. The Al-silicate fraction parallels its distribution in the regolith, emphasizing the local sediment source as a primary control to its distribution. Quartz and the heavy-mineral fraction, and associated trace elements, exhibit a complementary distribution to that of the Al-silicate fraction, with a level of enrichment in the bed sediment that is achieved through winnowing and sorting. The carbonate fraction has a distribution suggesting its dissolution during transport. Trace elements partitioned onto the Fe–Mn, possibly amorphous oxyhydride, fraction are introduced to the streams, in part, through human activity. Except for the heavy-mineral fraction, these fractions are identified in suspended sediment from the Mississippi River itself. Although comparison of the tributary bed sediment with the riverine suspended sediment is problematic, the geochemistry of the suspended sediment seems to corroborate the interpretation of the geochemistry of the bed sediment.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Geochemistry of bed and suspended sediment in the Mississippi river system: Provenance versus weathering and winnowing
Series title Science of Total Environment
DOI 10.1016/j.scitotenv.2005.05.041
Volume 362
Issue 1-3
Year Published 2006
Publisher Elsevier
Description 26 p.
First page 179
Last page 204
Country United States
Other Geospatial Arkansas basin, Ohio basin Tennessee basin, lower Mississippi basin, Missouri basin, Upper Mississippi basin,
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