A forty-five-minute drive away from Las Vegas lies a dormant
volcano that once expanded three thousand feet high and eight miles in circular
width. Hamblin-Cleopatra volcano nestled in the northern shore of lake mead was
once a rapidly forming stratovolcano that straddled the Hamblin Bay Fault. This
quiescent volcano had split into three different formations over the course of
millions of years due to earthquakes from the fault that it rested upon.
However, the most intriguing portion of this volcano is the magnetic polarity
of the three lobes. Both the Central and Cleopatra lobes show a split between
reverse and normal polarity rocks. However, the rocks within the Hamblin lobe
of the volcano are strictly reverse polarized. This is intriguing due to the
age of the volcano showing evidence of axial tilt during the Miocene era.
References:
Lutgens, F. K., Tarbuck, E. J., & Tasa, D. (2016).
Essentials of geology. Hoboken, NJ: Pearson.
Wawrzyniec, T. F., Geissman, J., Anderson, E. R., Harlan, S.
S., & Faulds, J. (2001, August). Paleomagnetic data bearing on style of
Miocene deformation in the Lake Mead area, Southern Nevada. Retrieved November
15, 2020, from https://www.researchgate.net/publication/222892032_Paleomagnetic_data_bearing_on_style_of_Miocene_deformation_in_the_Lake_Mead_area_Southern_Nevada
Anderson, E. R. (2019, October 8). Hamblin-Cleopatra
Volcano. Retrieved November 15, 2020, from
https://www.nps.gov/lake/learn/nature/hamblin-cleopatra-volcano.htm
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