Sponsor
Portland State University. Department of Geology
First Advisor
Michael L. Cummings
Date of Publication
Spring 3-4-2013
Document Type
Thesis
Degree Name
Master of Science (M.S.) in Geology
Department
Geology
Language
English
Subjects
Lake Abert (Or.), Mounds -- Oregon -- Lake Abert, Faults (Geology) -- Oregon -- Lake Abert
DOI
10.15760/etd.1061
Physical Description
1 online resource (ix, 90 pages)
Abstract
A series of tufa mounds is found within the northern basin of Lake Abert, located within southeastern Oregon. The mounds have been divided into 3 main groups and 1 sub-group (A1, A2, B, and C) based upon spatial and textural considerations. Mound groups appear at two different elevations: the 1310 meter elevation (Groups A2, B, and C), and the 1318 meter elevation (Group A1). Published carbon age dating of the Lake Abert 1325 meter strandline and the 1310 meter strandline indicates that the mounds were formed during the Late Pleistocene/Early Holocene. Facies analysis and mineralogical analysis of the mounds indicates that the mounds were primarily formed subaqueously during a lake regression, supporting oxygen isotope data from previous researchers. Magnetometer data within Groups A1 and A2 suggests that the mounds are associated with a series of magnetic lows which are oriented in joint sets (NW-SE, and N-S) which match the orientation of faulting within the region. While there appears to be another early mound building episode, no direct evidence confirms this.
Rights
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Persistent Identifier
http://archives.pdx.edu/ds/psu/9961
Recommended Citation
Bartruff, Anthony Lynn, "A Characterization of Lake Abert Tufa Mounds Lake Abert, Oregon" (2013). Dissertations and Theses. Paper 1061.
https://doi.org/10.15760/etd.1061