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A paleomagnetic study of tertiary intrusives in western San Diego County, California
In western San Diego county there are three igneous bodies that had no previous paleomagnetic work done on them. Two intrude Eocene, flat-lying sediments, and all are assumed to be Tertiary. Between seven and eight oriented cores were collected from each body. Lithologies range from basaltic to dacitic. The samples were measured for their natural remanent magnetization and then magnetically cleaned and re-measured. The direction of magnetization at two of the sites yielded good groupings. One site yielded poor results, not grouping at all and had weak intensities. All displayed more easterly declinations (N30E) than expected and steeper inclinations than expected. A magnetic survey was also conducted over one of the sites- Scripps Dike just north of La Jolla. Modeling of the magnetic anomaly from this survey suggests the dike is nearly vertical and thickens with depth.
San Diego State University
Bachelor of Science (B.S.) San Diego State University, 1995
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