150Lec23-1

150Lec23-1 - Lecture #23: Basin and Range Province (Abbott,...

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Lecture #23: Basin and Range Province (Abbott, pp. 125-126, 166-172) The Basin and Range Province covers much of Nevada and parts of surrounding states (Figure 7.14, p. 172; Figure 7.5, p. 167). In Lecture #17, we discussed the Long Valley caldera and Mammoth Mountain of eastern California, which are located in the western portion of the province. The crust in the Basin and Range is undergoing tension (it's stretching; Figure 7.6, p. 168) and magnitude 5-7 earthquakes periodically occur. As a result of tension, the province consists of a series of parallel mountains (called horsts ) and valleys (called grabens ) separated by normal faults (Figure 7.6, p. 168; Figure 7.7, p. 168; Figure 7.14, p. 172). Normal Faults, Grabens and Horsts in the Basin and Range Province The grabens separating the horsts average 16-24 kilometers (10-15 miles) wide. Although the area is spreading apart (Figure 7.6, p. 168), unlike Pangaea (Figure 3.14, p. 60), the spreading is probably too slow to ever produce a spreading zone and split apart the North
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This note was uploaded on 07/14/2011 for the course GLY 150 taught by Professor Henke during the Spring '08 term at Kentucky.

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150Lec23-1 - Lecture #23: Basin and Range Province (Abbott,...

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