Geology of the Salamanca region, Guanajuato, Mexico
Por:
Nieto-Samaniego, AF, Ojeda-Garcia, AC, Alaniz-Alvarez, SA, Xu, SS
Publicada:
1 ene 2012
Categoría:
Earth and Planetary Sciences (miscellaneous)
Resumen:
Geological cartography of the Salamanca-Aldama region in the state of Guanajuato, Mexico, was carried out at a scale of 1: 50000. The study area is located between the Transmexican Volcanic Belt and the Mesa Central physiographic provinces. During field work we identified 16 stratigraphic units. The oldest unit at a regional level is formed of sedimentary marine rocks, which belong to the Late Jurassic - Early Cretaceous (Tithonian-Hauterivian) Sierra de Guanajuato volcanosedimentary complex. This unit does not crop out within the study area. The oldest outcropping unit in the mapped area is a continental polymictic conglomerate, which is correlated with the "Guanajuato Red Conglomerate". An andesitic unit covers the conglomerate, and rhyolite domes and lava flows overlie the andesite. Although no topaz was observed during fieldwork, we correlate those rhyolites with the "topaz bearing-rhyolites" of the Oligocene volcanism of the Mesa Central. In addition, we identified three ignimbrit
Filiaciones:
Nieto-Samaniego, AF:
Univ Nacl Autonoma Mexico, Ctr Geociencias, Queretaro 76230, Queretaro, Mexico
Ojeda-Garcia, AC:
Univ Nacl Autonoma Mexico, Ctr Geociencias, Queretaro 76230, Queretaro, Mexico
Alaniz-Alvarez, SA:
Univ Nacl Autonoma Mexico, Ctr Geociencias, Queretaro 76230, Queretaro, Mexico
Xu, SS:
Univ Nacl Autonoma Mexico, Ctr Geociencias, Queretaro 76230, Queretaro, Mexico
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