geoscience exercise #1

geoscience exercise #1 - believed to be the center of the...

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Rikki Appleman Geo-Science 010 Exercise #1 Reference Robert L. Christiansen , G. R. Foulger , and John R. Evans   Upper-mantle origin of the Yellowstone Hotspot Geological Society of America Bulletin  (October 2002), 114(10):1245-1256 Summary It is believed that Yellowstone has an upper-mantle origin; however, some evidence is shown against this theory. There is no evidence that the system extends deeper than 200 km, and some evidence that it does not. The data available on the Yellowstone hotspot was used to study these differences in evidence. Seismic imaging was a useful tool in studying the Yellowstone region. In the model presented by the seismic imaging, you can see the boundary of Yellowstone National Park and the edges of the eastern Snake River Plain, colors indicating wave-speed variations in the layer in the depth interval 243–273 km, irregularly shaped, closed rings outlining calderas of the Yellowstone Plateau volcanic field, and at the northeast edge of the caldera there is
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Unformatted text preview: believed to be the center of the hotspot of Yellowstone. From the geological data found in this study, it is found that a deep-mantle origin is not required by the helium isotope data. The deep-mantle plume theory suggests wrongly that the tectonic relationships of the Yellowstone hotspot are by coincidence. This journal suggests that the features recognized in a Yellowstone hotspot are essential components of regional upper-mantle tectonics of the northwestern United States. In other words, partial melting of the upper mantle, emplacement of the resulting mantle melting into the crust, consequential crustal melting, and voluminous surface eruption have molded Yellowstone into the park it is today. I found this journal article interesting because it explains different theories and why one is wrong and the other right. It backs the correct theory up with plentiful data and models. It was interesting to view the models and to actually envision what the theory is suggesting....
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