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Paleomagnetism Of Cascade Range Pleistocene Lava Flows Near Mckenzie Bridge, Oregon, Chelsea Jaeger
Paleomagnetism Of Cascade Range Pleistocene Lava Flows Near Mckenzie Bridge, Oregon, Chelsea Jaeger
Summer Research
The purpose of this study is to examine geomagnetic field behavior recorded in a series of Pleistocene lava flows located near McKenzie Bridge, Oregon. Twenty-four sites, each consisting of at least ten samples were collected during July of 2011 and 2012. Alternating field (AF) and thermal demagnetization studies reveal normal, reversed, and possibly transitional polarities. Thermal demagnetization studies indicate the bulk of the magnetic signal is held in low titanium magnetite. Additional AF and thermal analysis is required to confirm transitional directions. In addition, polished sections will be prepared for optical examination to confirm the magnetic mineralogy of the samples.
Paleomagnetism Of A Sequence Of Lava Flows Near Mckenzie Bridge, Or, Blake Titcomb
Paleomagnetism Of A Sequence Of Lava Flows Near Mckenzie Bridge, Or, Blake Titcomb
Summer Research
A series of fifteen lava flows were sampled off of Oregon’s Forest Road 2649 were sampled for paleomagnetic study. The flows are exposed on a south-facing slope overlooking Scott Creek. Ten to twelve samples were taken at each of the fifteen sites. The purpose of this study is to analyze the behavior of the geomagnetic field during the eruption of these lavas. Preliminary paleomagnetic analysis using standard alternating field demagnetization has yielded the magnetic directions seen in Figure 5. The data show a clustering of virtual geomagnetic pole (VGP) positions in Northern Asia with several other VGPs scattered in the …