Crustal structure and location of the Ouachita orogenic belt in northern Mexico
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| Natura: | Artículo científico |
| Lingua: | en |
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Universidad Nacional Autónoma de México
2000
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| _version_ | 1876441530234830848 |
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| author | F. A. Moreno |
| author_facet | F. A. Moreno |
| contents | Crustal structure and location of the Ouachita orogenic belt in northern Mexico F. A. Moreno K. L. Mickus G. Randy Keller Ciencias de la Tierra Mexico Paleozoic Pb isotopes gravity anomalies Ouachita orogenic belt The location of the Paleozoic southern margin of Laurentia in Mexico has been much debated. Determining its location isimportant for the evaluation of hypotheses that suggest large pieces of southwestern North America were translated toward SouthAmerica during the breakup of Laurentia (early Cambrian) and Pangea (early Mesozoic) and that there were large lateral movementsin northern Mexico in Mesozoic time that displaced the Ouachita orogenic belt. Using limited Paleozoic outcrops, leadisotopic data, regional seismic data and regional gravity anomalies, we show that the Ouachita orogenic belt and the Laurentianmargin in Mexico trend either directly south into Coahuila or south-southwest across Chihuahua toward Durango from the BigBend region of west Texas. In order to evaluate these two possibilities, integrated crustal models were constructed along threeprofiles in northern Mexico and west Texas. Because constraints on deep structure are sparse, each profile could be modeled witheither a southward or a south-southwestward extension of the Ouachita orogenic belt. The southward extension model suggeststhat two regional gravity minima delineate a Paleozoic foreland basin (Mapimi basin) along the Chihuahua/Coahuila border, andan accreted terrane (Coahuila terrane) in western Coahuila. The south-southwestward extension model suggests that these gravityminima both delineate accreted terranes. We favor a south-southwestward extension because we can trace the gravity maximumassociated with the known Ouachita interior zone 300 km into eastern Chihuahua and south toward Durango in a way that isconsistent with trends in lead isotopic data, pre-Mesozoic geologic data from drill holes and outcrops, and Ouachita-style lithologiesand structures found in western Sonora. Spanning the gap between the postulated Ouachita orogenic belt in southern Chihuahuawith possible similar lithologies in Sonora with a northwest-trending margin provides a simple way to complete our picture ofthe southern portion of Laurentia during the early Paleozoic. 2000 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56839303 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.3 Vol.39 |
| format | Artículo científico |
| id | redalyc_56839303 |
| institution | Redalyc |
| language | en |
| publishDate | 2000 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Crustal structure and location of the Ouachita orogenic belt in northern Mexico F. A. Moreno Ciencias de la Tierra Mexico Paleozoic Pb isotopes gravity anomalies Ouachita orogenic belt Crustal structure and location of the Ouachita orogenic belt in northern Mexico F. A. Moreno K. L. Mickus G. Randy Keller Ciencias de la Tierra Mexico Paleozoic Pb isotopes gravity anomalies Ouachita orogenic belt The location of the Paleozoic southern margin of Laurentia in Mexico has been much debated. Determining its location isimportant for the evaluation of hypotheses that suggest large pieces of southwestern North America were translated toward SouthAmerica during the breakup of Laurentia (early Cambrian) and Pangea (early Mesozoic) and that there were large lateral movementsin northern Mexico in Mesozoic time that displaced the Ouachita orogenic belt. Using limited Paleozoic outcrops, leadisotopic data, regional seismic data and regional gravity anomalies, we show that the Ouachita orogenic belt and the Laurentianmargin in Mexico trend either directly south into Coahuila or south-southwest across Chihuahua toward Durango from the BigBend region of west Texas. In order to evaluate these two possibilities, integrated crustal models were constructed along threeprofiles in northern Mexico and west Texas. Because constraints on deep structure are sparse, each profile could be modeled witheither a southward or a south-southwestward extension of the Ouachita orogenic belt. The southward extension model suggeststhat two regional gravity minima delineate a Paleozoic foreland basin (Mapimi basin) along the Chihuahua/Coahuila border, andan accreted terrane (Coahuila terrane) in western Coahuila. The south-southwestward extension model suggests that these gravityminima both delineate accreted terranes. We favor a south-southwestward extension because we can trace the gravity maximumassociated with the known Ouachita interior zone 300 km into eastern Chihuahua and south toward Durango in a way that isconsistent with trends in lead isotopic data, pre-Mesozoic geologic data from drill holes and outcrops, and Ouachita-style lithologiesand structures found in western Sonora. Spanning the gap between the postulated Ouachita orogenic belt in southern Chihuahuawith possible similar lithologies in Sonora with a northwest-trending margin provides a simple way to complete our picture ofthe southern portion of Laurentia during the early Paleozoic. 2000 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56839303 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.3 Vol.39 |
| title | Crustal structure and location of the Ouachita orogenic belt in northern Mexico |
| topic | Ciencias de la Tierra Mexico Paleozoic Pb isotopes gravity anomalies Ouachita orogenic belt |
| url | https://www.redalyc.org/articulo.oa?id=56839303 |