Structural evidence of enhanced active subsidence at the bottom of a maar: Rincón de Parangueo, México
Por:
Aranda-Gómez J.J., Cerca M., Rocha-Treviño L., Carrera-Hernández J.J., Levresse G., Pacheco J., Yutsis V., Arzate-Flores J.A., Chacón E., Beraldi-Campesi H.
Publicada:
1 ene 2017
Resumen:
Rincón de Parangueo is a Quaternary maar that has been recently desiccated. The crater was partially occupied by a soda lake, and near the shoreline microbialites have formed. Evaporites (mainly trona and halite) precipitated as the water level dropped. Active subsidence of the lake floor (c. 24 m since 1980) produced countless structures close to the lakeshore, where deformation is extensional. Closer to the depocentre, in the western half of the basin, gliding/spreading produced folds and mud-injection domes. The most remarkable structure throughout the basin is a monocline that forms a ring-like, nearly continuous scarp, approximately 15 m high, which in the eastern half of the basin was produced as a fault-propagation fold developed above the buried diatreme-country rock boundary. A more diffuse (wider) monocline, locally associated with compressive structures, occurs in the western half of the basin. These structures are interpreted as having developed above a gently inclined, irregular lake sediment-country rock (andesite) interphase. The monocline was modified by high-angle extensional faults/fractures with large heaves/ apertures. In the eastern half of the basin, there is a second (outer) scarp, approximately 13 m high, formed by a high-angle, listric, normal fault. Rollover antiforms occur in the hanging wall of this structure. Rincón is an example of centripetal gravitational gliding/spreading. © 2017 The Author(s). Published by The Geological Society of London. All rights reserved.
Filiaciones:
Aranda-Gómez J.J.:
Centro de Geociencias, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Querétaro, 76230, Mexico
Cerca M.:
Centro de Geociencias, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Querétaro, 76230, Mexico
Rocha-Treviño L.:
Centro de Geociencias, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Querétaro, 76230, Mexico
Posgrado en Ciencias de la Tierra, Centro de Geociencias, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Querétaro, 76230, Mexico
Carrera-Hernández J.J.:
Centro de Geociencias, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Querétaro, 76230, Mexico
Levresse G.:
Centro de Geociencias, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Querétaro, 76230, Mexico
Pacheco J.:
Centro de Ciencias del Diseño y la Construcción, Universidad Autónoma de Aguascalientes, Avenida Universidad 940, Aguascalientes, 20131, Mexico
Yutsis V.:
División de Geociencias Aplicadas, Instituto Potosino de Investigación Científica y Tecnológica, Camino a la presa de San José 2055, San Luis Potosí, 78216, Mexico
Arzate-Flores J.A.:
Centro de Geociencias, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Querétaro, 76230, Mexico
Chacón E.:
Facultad de Ciencias de la Tierra, Universidad Autónoma de Nuevo León, Carretera a Cerro Prieto km 8, Linares, N.L., 67700, Mexico
Beraldi-Campesi H.:
Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad de México, D.F, 04510, Mexico
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