A Seismic Stratigraphic Study of Western Lake Superior
1997-09
Loading...
View/Download File
Persistent link to this item
Statistics
View StatisticsJournal Title
Journal ISSN
Volume Title
Title
A Seismic Stratigraphic Study of Western Lake Superior
Authors
Published Date
1997-09
Publisher
Type
Thesis or Dissertation
Abstract
Approximately 1000 km of high resolution seismic and sidescan sonar profiles were collected in the western third of Lake Superior during the 1996 field season. The study area was bounded to the east by a line from Isle Royale to Houghton, Michigan, and extended westward to Duluth, Minnesota. Seven seismic facies are identified on seismic reflection profiles. Each has a distinct acoustic signature, and can be correlated with a representative section of Lake Superior sediments. These units are incorporated into three depositional groups. The oldest sediments, Group A, represent pre-Late Wisconsinan and Late Wisconsinan sedimentation (Isotope stage 4-2). This group contains seismic facies composed of lacustrine clays and till. Group A is followed by Group B, which includes till, red clay, red varved clay and gray varved clay. This group represents Split Rock and Nickerson phase glacial deposits (Isotope stage 2). The youngest group, Group C, contains gray clay, which represents Holocene sedimentation (Isotope stage 1). Sidescan sonar profiles revealed features covering the lake floor including circular depressions and linear grooves interpreted to be iceberg scour marks. Three moraines, found on seismic profiles within the till unit of Group B, could represent the ice margin at the time of Glacial Lake Duluth.
Description
A Thesis submitted to the faculty of the Graduate School of the University of Minnesota by Keri Ann Anderson in partial fulfillment of the requirements for the degree of Master of Science, September 1997.
Related to
Replaces
License
Series/Report Number
Funding information
Isbn identifier
Doi identifier
Previously Published Citation
Suggested citation
Anderson, Keri Ann. (1997). A Seismic Stratigraphic Study of Western Lake Superior. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/212455.
Content distributed via the University Digital Conservancy may be subject to additional license and use restrictions applied by the depositor. By using these files, users agree to the Terms of Use. Materials in the UDC may contain content that is disturbing and/or harmful. For more information, please see our statement on harmful content in digital repositories.