An overview of Precambrian rocks in Sonora
The oldest stratified rock recognized in NW Sonora (and in Mexico) are deformed muscovite-quartz schists, quartzites, and biotite-quartzofeldspathic gneisses near Caborca, which are cut by calcalkaline intrusives ranging from 1,710 to 1,750 m.y. in age. Southwest of Caborca, upper amphibolite facie...
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Universidad Nacional Autónoma de México
2019-03-01
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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/1318 |
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| author | Thomas H. Anderson Leon T. Silver |
| author_facet | Thomas H. Anderson Leon T. Silver |
| author_sort | Thomas H. Anderson |
| collection | DOAJ |
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The oldest stratified rock recognized in NW Sonora (and in Mexico) are deformed muscovite-quartz schists, quartzites, and biotite-quartzofeldspathic gneisses near Caborca, which are cut by calcalkaline intrusives ranging from 1,710 to 1,750 m.y. in age. Southwest of Caborca, upper amphibolite facies layered quartzofeldspathic and amphibolitic gneisses were apparently deformed and metamorphosed at about 1,660 ± 15 m.y. ago, concealing original lithologies and ages. In northeastern Sonora, a younger belt of eugeosynclinal strata, about 1,680 ± 20 m.y. old was tightly folded and metamorphosed to greenschist facies about 1,650 m. y. ago. Numerous granitic plutons intruded into the older Precambrian crust about 1,410 to 1,440 m.y. ago. These major intrusive masses are not known to have been accompanied by regional sedimentation or deformation. Rare, small plutons of micrographic granite added to the Precambrian crystalline complexes about 1,100 m.y. ago, are the youngest Precambrian igneous rocks recognized... In order to continue, download the full paper in PDF.
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| format | Article |
| id | doaj-art-aef5d2e82768496596c6d5bafafb9202 |
| institution | Kabale University |
| issn | 1026-8774 2007-2902 |
| language | English |
| publishDate | 2019-03-01 |
| publisher | Universidad Nacional Autónoma de México |
| record_format | Article |
| series | Revista Mexicana de Ciencias Geológicas |
| spelling | doaj-art-aef5d2e82768496596c6d5bafafb92022025-08-20T03:44:51ZengUniversidad Nacional Autónoma de MéxicoRevista Mexicana de Ciencias Geológicas1026-87742007-29022019-03-0152An overview of Precambrian rocks in SonoraThomas H. Anderson0Leon T. Silver1Department of Geology and Planetary Sciences, University of Pittsburgh, Pittsburg, Pennsylvania 15260, U.S.A.Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, U.S.A. The oldest stratified rock recognized in NW Sonora (and in Mexico) are deformed muscovite-quartz schists, quartzites, and biotite-quartzofeldspathic gneisses near Caborca, which are cut by calcalkaline intrusives ranging from 1,710 to 1,750 m.y. in age. Southwest of Caborca, upper amphibolite facies layered quartzofeldspathic and amphibolitic gneisses were apparently deformed and metamorphosed at about 1,660 ± 15 m.y. ago, concealing original lithologies and ages. In northeastern Sonora, a younger belt of eugeosynclinal strata, about 1,680 ± 20 m.y. old was tightly folded and metamorphosed to greenschist facies about 1,650 m. y. ago. Numerous granitic plutons intruded into the older Precambrian crust about 1,410 to 1,440 m.y. ago. These major intrusive masses are not known to have been accompanied by regional sedimentation or deformation. Rare, small plutons of micrographic granite added to the Precambrian crystalline complexes about 1,100 m.y. ago, are the youngest Precambrian igneous rocks recognized... In order to continue, download the full paper in PDF. https://rmcg.unam.mx/index.php/rmcg/article/view/1318tectonic, Precambrian, Sonora, Mexico |
| spellingShingle | Thomas H. Anderson Leon T. Silver An overview of Precambrian rocks in Sonora Revista Mexicana de Ciencias Geológicas tectonic, Precambrian, Sonora, Mexico |
| title | An overview of Precambrian rocks in Sonora |
| title_full | An overview of Precambrian rocks in Sonora |
| title_fullStr | An overview of Precambrian rocks in Sonora |
| title_full_unstemmed | An overview of Precambrian rocks in Sonora |
| title_short | An overview of Precambrian rocks in Sonora |
| title_sort | overview of precambrian rocks in sonora |
| topic | tectonic, Precambrian, Sonora, Mexico |
| url | https://rmcg.unam.mx/index.php/rmcg/article/view/1318 |
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