Detrital zircon geochronology of Neoproterozoic to Middle Cambrian miogeoclinal and platformal strata: Northwest Sonora, Mexico
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| Formato: | Artículo científico |
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Universidad Nacional Autónoma de México
2000
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| _version_ | 1876482598871498752 |
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| author | Essa L. Gross |
| author_facet | Essa L. Gross |
| contents | Detrital zircon geochronology of Neoproterozoic to Middle Cambrian miogeoclinal and platformal strata: Northwest Sonora, Mexico Essa L. Gross John H. Stewart George E. Gehrels Ciencias de la Tierra Detrital zircons Pb geochronology northwest Mexico Eighty-five detrital zircon grains from Mesoproterozoic and/or Neoproterozoic to Middle Cambrian sedimentary strata innorthwest Sonora, Mexico, have been analyzed to determine source terranes and provide limiting depositional ages of the units.The zircon suites from the Mesoproterozoic and/or Neoproterozoic El Alamo Formation and El Aguila unit yield ages between1.06 Ga and 2.67 Ga, with predominant ages of 1.1 to 1.2 Ga. Zircons from the Lower? and Middle Cambrian Bolsa Quartziteshow age groups from 525 Ma to 1.63 Ga, with a dominant population of 1.1 to 1.2 Ga grains. Grains older than 1.2 Ga in thesamples were most likely derived from basement terranes and ~1.4 Ga granitic bodies of the southwest U.S. and northwestMexico. It is also possible that the sediments were transported from the south, although source rocks of the appropriate age are notpresently exposed south of the study area in northern Mexico. Three possibilities for the dominant 1.1 to 1.2 Ga grains includederivation from: (1) exposures of the Grenville belt in southern North America, (2) local 1.1-1.2 Ga granite bodies, or (3) asouthern source, such as the Oaxaca terrane, that was subsequently rifted away. Sampling of additional units in the western U.S.and northern Mexico may help resolve the ambiguity surrounding the source of the 1.1 to 1.2 Ga grains. 2000 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56839401 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.4 Vol.39 |
| format | Artículo científico |
| id | redalyc_56839401 |
| institution | Redalyc |
| language | en |
| publishDate | 2000 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Detrital zircon geochronology of Neoproterozoic to Middle Cambrian miogeoclinal and platformal strata: Northwest Sonora, Mexico Essa L. Gross Ciencias de la Tierra Detrital zircons Pb geochronology northwest Mexico Detrital zircon geochronology of Neoproterozoic to Middle Cambrian miogeoclinal and platformal strata: Northwest Sonora, Mexico Essa L. Gross John H. Stewart George E. Gehrels Ciencias de la Tierra Detrital zircons Pb geochronology northwest Mexico Eighty-five detrital zircon grains from Mesoproterozoic and/or Neoproterozoic to Middle Cambrian sedimentary strata innorthwest Sonora, Mexico, have been analyzed to determine source terranes and provide limiting depositional ages of the units.The zircon suites from the Mesoproterozoic and/or Neoproterozoic El Alamo Formation and El Aguila unit yield ages between1.06 Ga and 2.67 Ga, with predominant ages of 1.1 to 1.2 Ga. Zircons from the Lower? and Middle Cambrian Bolsa Quartziteshow age groups from 525 Ma to 1.63 Ga, with a dominant population of 1.1 to 1.2 Ga grains. Grains older than 1.2 Ga in thesamples were most likely derived from basement terranes and ~1.4 Ga granitic bodies of the southwest U.S. and northwestMexico. It is also possible that the sediments were transported from the south, although source rocks of the appropriate age are notpresently exposed south of the study area in northern Mexico. Three possibilities for the dominant 1.1 to 1.2 Ga grains includederivation from: (1) exposures of the Grenville belt in southern North America, (2) local 1.1-1.2 Ga granite bodies, or (3) asouthern source, such as the Oaxaca terrane, that was subsequently rifted away. Sampling of additional units in the western U.S.and northern Mexico may help resolve the ambiguity surrounding the source of the 1.1 to 1.2 Ga grains. 2000 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56839401 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.4 Vol.39 |
| title | Detrital zircon geochronology of Neoproterozoic to Middle Cambrian miogeoclinal and platformal strata: Northwest Sonora, Mexico |
| topic | Ciencias de la Tierra Detrital zircons Pb geochronology northwest Mexico |
| url | https://www.redalyc.org/articulo.oa?id=56839401 |