Late Cretaceous deformation at the border between the Mesa Central and the Sierra Madre Oriental, central Mexico
Por:
Cid-Villegas, Gonzalo, Alaniz-Alvarez, Susana Alicia, Xu, Shunshan, Vasquez-Serrano, Alberto, Juarez-Arriaga, Edgar
Publicada:
1 ene 2022
Categoría:
Earth and planetary sciences (miscellaneous)
Resumen:
In central Mexico, two important Cretaceous tectonic events have been
identified: the accretion of the Gue-rrero Terrain (Early Cretaceous)
and the beginning of the Mexican Orogen (Late Cretaceous-Paleogene).
Both events present a direction of tectonic transport to the northeast
in the center of Mexico, and they have been studied both in the Mesa
Central and in the Sierra Madre Oriental. However, little study has
characterized the contractile deformation in the border between both
provinces. In order to contribute to a better understanding of the Late
Cretaceous deformation in central Mexico, this research focuses on the
border of both provinces, especially in the Juriquilla, San Miguel de
Allende localities, and Sierra de los Cuar-zos. The objectives of this
research were a) Identify the contractile deformation of the Mesozoic
rocks in the study area. b) Determine variations in the direction of
tectonic transport of the study area concerning the Mesa Central and
Sierra Madre Oriental. In this research, new structural data and U-Pb
ages in detrital zircon grains are reported. The possibility of having
two contractive deformation events is discussed. The D1 event is
inferred contemporary to the accretion of the Guerrero Terrain and is
observed in the oldest rocks of Sierra de los Cuarzos. On other hand,
the maximum deposit ages obtained in San Miguel de Allende and
Juriquilla, 110.2 +/- 0.8 Ma and 110.5 +/- 0.9 Ma (Early Albian),
respectively, limit the age of the D2 deformation, being after similar
to 110 Ma. Therefore, this resulting deformation contemporaneous with
the formation of the Mexican Orogen. Event D2 is observed in all three
areas. Through the structural analysis it was determined that D1 has a
direction of transport to the southeast, while D2 has a direction of
transport to the west-southwest or southwest. These transport directions
differ from that of the Guerrero Terrain accretion and from the
formation of the Mexican Orogen. This difference in the direction of
transport could be the product of retrodeformation, and or
heterogeneities in the basement.
Filiaciones:
Cid-Villegas, Gonzalo:
Posgrado en Ciencias de la Tierra, Centro de Geociencias, Universidad Nacional Autónoma de México, Blvd. Juriquilla No. 3001, Querétaro, 76230, Mexico
Centro de Geociencias, Universidad Nacional Autónoma de México, Blvd. Juriquilla No. 3001, Querétaro, 76230, Mexico
Alaniz-Alvarez, Susana Alicia:
Centro de Geociencias, Universidad Nacional Autónoma de México, Blvd. Juriquilla No. 3001, Querétaro, 76230, Mexico
Xu, Shunshan:
Centro de Geociencias, Universidad Nacional Autónoma de México, Blvd. Juriquilla No. 3001, Querétaro, 76230, Mexico
Vasquez-Serrano, Alberto:
Instituto de Geología, Universidad Nacional Autónoma de México, Av. Universidad No. 3000, CDMX, 04510, Mexico
Juarez-Arriaga, Edgar:
Instituto de Geología, Universidad Nacional Autónoma de México, Av. Universidad No. 3000, CDMX, 04510, Mexico
gold, Gold
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