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GSA Special Papers
Ash-Flow Tuffs
Author(s)
Geological Society of America

Volume
180
Copyright:
© 1979 Geological Society of America
Geological Society of America
ISBN print:
9780813721804
Publication date:
January 01, 1979
Book Chapter
Ignimbrites of the Sierra Madre Occidental and their relation to the tectonic history of western Mexico
Author(s)
-
Published:January 01, 1979
Igneous rocks of the Sierra Madre Occidental have been studied along two traverses across the range. One is at lat 24°N between Mazatlán and Durango City, where contiguous mapped areas extend across the Sierra; the other is near lat 28°N, where several separate areas west and north of Chihuahua City have been mapped. In these regions the Sierra contains two vast and largely coextensive igneous sequences, both calc-alkalic and both including ignimbrites. The older sequence of rocks, which ranges in age from 45 m.y. to at least 100 m.y., is characterized by abundant batholithic as well as volcanic rocks and...
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