The Santa Maria Basin (SMB) lies between the rotated Western Transverse Ranges, and the non-rotated Southern Coast Ranges. The goal of this study was to use paleomagnetism to determine if the SMB is rotated or not and the samples were subject to alternating field and thermal demagnetization analysis. Equal area diagrams indicate the samples have a remanence dominated entirely by the present day field, resulting in a failure to answer the main question of the study. Remagnetization probably occurred due to partial oxidation of pyrite to magnetite as the rocks were lifted above sea level during the Pleistocene, causing flushing of the formation with meteoric groundwater. This process is commonly observed in rocks found in fold and thrust belts.
A preliminary magnetostratigraphic analysis of the McDonald Shale Member of the Miocene Monterey Formation at Chico Martinez Creek resulted in the identification at least 3 reversals of the ancient geomagnetic field.
|Commitee:||Behl, Richard J., Kelty, Tom|
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 52/05M(E), Masters Abstracts International|
|Subjects:||Physical geography, Geology, Petroleum Geology, Plate Tectonics|
|Keywords:||Neogene Tectonic Rotation, Paleomagnetism, Santa Maria Basin, Vertical Axis rotation|
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