Paleomagnetic analysis of bimodal magmatism

associated with Tule Tank Crater, San Francisco Volcanic

Field, northeastern Arizona

Christina Turpin

Dr. Michael OrtNorthern Arizona University, Department of

Geology

Background

San Francisco Volcanic Field (SFVF)

ResearchTule Tank Crater

Pre-Matuyama (+2.6 Ma)

Matuyama (2.6 Ma – 800 ka)

Brunhes (800 ka - Present)

Methods

Field Work

Sample Collection >

< Tule Tank

Lab Work

1)Set in Plaster

2)Drill

3)Cut

4)Process

Data Analysis

ResultsBenmoreite

Site 5.1 Site 10

Modern magnetic field

Rhyolite

Results

Site 1.3Site 8.2

Modern magnetic field

Conclusions

•Preliminary data show some consistencies with Matuyama age of eruption

•Alteration of samples’ magnetization has likely occurred

•Further analysis is needed before conclusions are interpreted

Acknowledgements

Dr. Michael Ort, Dr. Nadine Barlow and Kathleen Stigmon,

NAU/NASA Space Grant, andArizona Space Grant Consortium

for allowing me this research opportunity!!

Questions?

Transporting samples out of a very snowy

field site