The igneous history of the Sierra Madre Occidental and its relation to the tectonic evolution of western Mexico
Igneous rocks of the Sierra Madre Occidental have been mapped and dated along latitude 24° N between Mazatlán and Durango City and near latitude 28° N in Chihuahua. In both of these regions and probably throughout the Sierra Madre Occidental are found two vast and largely coextensive igneous sequen...
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| Format: | Article |
| Language: | English |
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Universidad Nacional Autónoma de México
2019-04-01
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| Series: | Revista Mexicana de Ciencias Geológicas |
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| Online Access: | https://rmcg.unam.mx/index.php/rmcg/article/view/1355 |
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| author | Fred W. McDowell Stephen E. Clabaugh |
| author_facet | Fred W. McDowell Stephen E. Clabaugh |
| author_sort | Fred W. McDowell |
| collection | DOAJ |
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Igneous rocks of the Sierra Madre Occidental have been mapped and dated along latitude 24° N between Mazatlán and Durango City and near latitude 28° N in Chihuahua. In both of these regions and probably throughout the Sierra Madre Occidental are found two vast and largely coextensive igneous sequences, both calcalkalic and both including ignimbrites, but otherwise dissimilar. The older sequence, ranging in age from 45 m. y. to at least 100 m. y., contains abundant batholithic as well as volcanic rocks dominantly of intermediate composition. The younger sequence is dominated by rhyolitic ignimbrites erupted from numerous large caldera complexes. Smaller outpourings of basaltic lava accompanied the ash flows, but intermediate rocks are rare. Most of the volcanism was confined tu a brief interval 34 to 27 m. y. ago.
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| format | Article |
| id | doaj-art-7844cdac2ea64a19b440f883abca52d0 |
| institution | Kabale University |
| issn | 1026-8774 2007-2902 |
| language | English |
| publishDate | 2019-04-01 |
| publisher | Universidad Nacional Autónoma de México |
| record_format | Article |
| series | Revista Mexicana de Ciencias Geológicas |
| spelling | doaj-art-7844cdac2ea64a19b440f883abca52d02025-08-20T03:44:51ZengUniversidad Nacional Autónoma de MéxicoRevista Mexicana de Ciencias Geológicas1026-87742007-29022019-04-0152The igneous history of the Sierra Madre Occidental and its relation to the tectonic evolution of western MexicoFred W. McDowell0Stephen E. Clabaugh1Department of Geological Sciences, The University of Texas at Austin, Austin, Texas 78712, U.S.A.Department of Geological Sciences, The University of Texas at Austin, Austin, Texas 78712, U.S.A. Igneous rocks of the Sierra Madre Occidental have been mapped and dated along latitude 24° N between Mazatlán and Durango City and near latitude 28° N in Chihuahua. In both of these regions and probably throughout the Sierra Madre Occidental are found two vast and largely coextensive igneous sequences, both calcalkalic and both including ignimbrites, but otherwise dissimilar. The older sequence, ranging in age from 45 m. y. to at least 100 m. y., contains abundant batholithic as well as volcanic rocks dominantly of intermediate composition. The younger sequence is dominated by rhyolitic ignimbrites erupted from numerous large caldera complexes. Smaller outpourings of basaltic lava accompanied the ash flows, but intermediate rocks are rare. Most of the volcanism was confined tu a brief interval 34 to 27 m. y. ago. https://rmcg.unam.mx/index.php/rmcg/article/view/1355volcanism, Sierra Madre Occidental, Mazatlá, Durango, Chihuahua, Mexico |
| spellingShingle | Fred W. McDowell Stephen E. Clabaugh The igneous history of the Sierra Madre Occidental and its relation to the tectonic evolution of western Mexico Revista Mexicana de Ciencias Geológicas volcanism, Sierra Madre Occidental, Mazatlá, Durango, Chihuahua, Mexico |
| title | The igneous history of the Sierra Madre Occidental and its relation to the tectonic evolution of western Mexico |
| title_full | The igneous history of the Sierra Madre Occidental and its relation to the tectonic evolution of western Mexico |
| title_fullStr | The igneous history of the Sierra Madre Occidental and its relation to the tectonic evolution of western Mexico |
| title_full_unstemmed | The igneous history of the Sierra Madre Occidental and its relation to the tectonic evolution of western Mexico |
| title_short | The igneous history of the Sierra Madre Occidental and its relation to the tectonic evolution of western Mexico |
| title_sort | igneous history of the sierra madre occidental and its relation to the tectonic evolution of western mexico |
| topic | volcanism, Sierra Madre Occidental, Mazatlá, Durango, Chihuahua, Mexico |
| url | https://rmcg.unam.mx/index.php/rmcg/article/view/1355 |
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