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Geosphere; May 2006; v. 2; no. 3; p. 125-141; DOI: 10.1130/GES00042.1
© 2006 Geological Society of America
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Major ignimbrites and volcanic centers of the Copper Canyon area: A view into the core of Mexico's Sierra Madre Occidental

Eric R. Swanson*1, Kirt A. Kempter2, Fred W. McDowell3 and William C. McIntosh4

1 Department of Earth and Environmental Science, The University of Texas at San Antonio, San Antonio, Texas 78249, USA
2 2623 Via Caballero del Norte, Santa Fe, New Mexico 87505, USA
3 Department of Geological Sciences, The University of Texas at Austin, Austin, Texas 78712, USA
4 New Mexico Geochronology Research Laboratory, New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801, USA


Figure 01
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  		Figure 1. Major exposures of Tertiary volcanic rocks of the Sierra Madre Occidental volcanic field and of adjacent regions in Baja California, Arizona, New Mexico, Texas, and in southwestern Colorado (inset at the same scale). Outcrop pattern is adapted from Swanson and McDowell (1984), and modified by information from Ferrari et al. (2002).

 

Figure 02
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  		Figure 2. Location map for the Copper Canyon and Tomóchic areas with numbers (1–6) marking the names and locations of the various calderas listed in the legend.

 

Figure 03
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  		Figure 3. Photo composite of the view looking northward toward ignimbrite units exposed in the Mogotabo section at Copper Canyon.

 

Figure 04
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  		Figure 4. Geologic map of the southern section from Divisadero to Creel. MSL—mean sea level.

 

Figure 05
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  		Figure 5. Geologic map of the central section from Creel to San Juanito, showing the San Juanito caldera centered on Cordon Cumbre Alta, 15 km northwest of the town of San Juanito.

 

Figure 06
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  		Figure 6. Geologic map of the northern section covering Sierra El Comanche and the Sierra Manzanita, showing the Manzanita caldera.

 

Figure 07
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  		Figure 7. Regional ignimbrite correlation diagram showing the relative geographic position of the various areas discussed, the ignimbrite units exposed in each area and the suggested regional correlations as discussed in the text. Note the tentative correlation between units 2 and 4 of the southern area and the northern area's Alamito and El Comanche tuff.

 

Figure 08
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  		Figure 8. Photo composites of the San Juanito and Manzanita calderas

 




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