North-Central Section - 43rd Annual Meeting (2-3 April 2009)
Paper No. 17-11
Presentation Time: 1:00 PM-5:00 PM

LITHOLOGIC COMPOSITION OF THREE STUDY SITES IN THE UPPER MISSISSIPPI RIVER VALLEY: SEDIMENT PROVENANCE, CHARACTERISTICS, AND CORRELATION

OLIVI, Andrew Patrick, Geology, Augustana College, 639 38th Street, Box # 1687, Rock Island, IL 61201, andrew-olivi@augustana.edu

Very little research has focused on the formation of channel islands in the Upper Mississippi River (UMR). However, understanding the deposition and composition of these islands is important for identifying the nature of sedimentation on a vital waterway, as well as for gaining insight into the geomorphology of fluvial processes. UMR sediment is a product of its tributaries and thus reflects each tributary's sedimentary composition. This project analyzes bed-load deposits from multiple tributaries of the UMR so that their mineralogical “fingerprints” can be determined in order to identify the provenance of sediments in downstream islands. Five sediment cores were extracted from three locations in the UMR valley, two of which were removed with a Geoprobe®. Additionally, bed-load deposits were sampled from the main channel of the UMR at Rock Island, Illinois and from the Rock, Wisconsin, and Chippewa Rivers along with the UMR headwaters and some lesser tributaries. Two separate islands in the UMR proper near the Quad Cities were chosen for core-drilling, and an additional core was taken on the shore of the Rock River in Moline, Illinois. Sediment size analysis and relative mineralogies of samples from within these cores will yield information on depositional processes and provenance of the island sediments. Grain fractions of 1 Φ and coarser were isolated to compare the lithologic characteristics of deposits between core sites and to match them with the mineralogical provenance from a UMR tributary or tributaries that have contributed the most to island deposition.

North-Central Section - 43rd Annual Meeting (2-3 April 2009)
General Information for this Meeting
Session No. 17--Booth# 11
Undergraduate Research II (Posters)
Northern Illinois University Rockford: 215-217
1:00 PM-5:00 PM, Thursday, 2 April 2009

Geological Society of America Abstracts with Programs, Vol 41, No. 4, p. 29

© Copyright 2009 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.