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Structural evidence of enhanced active subsidence at the bottom of a maar: Rincón de Parangueo, México

By
José Jorge Aranda-Gómez
José Jorge Aranda-Gómez
Centro de Geociencias, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Querétaro 76230, México
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Mariano Cerca
Mariano Cerca
Centro de Geociencias, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Querétaro 76230, México
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Luis Rocha-Treviño
Luis Rocha-Treviño
Posgrado en Ciencias de la Tierra, Centro de Geociencias, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Querétaro 76230, México
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Jaime Jesús Carrera-Hernández
Jaime Jesús Carrera-Hernández
Centro de Geociencias, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Querétaro 76230, México
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Gilles Levresse
Gilles Levresse
Centro de Geociencias, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Querétaro 76230, México
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Jesús Pacheco
Jesús Pacheco
Centro de Ciencias del Diseño y la Construcción, Universidad Autónoma de Aguascalientes, Avenida Universidad 940, Aguascalientes 20131, México
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Vsevolod Yutsis
Vsevolod Yutsis
División de Geociencias Aplicadas, Instituto Potosino de Investigación Científica y Tecnológica, Camino a la presa de San José 2055, San Luis Potosí 78216, México
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Jorge Arturo Arzate-Flores
Jorge Arturo Arzate-Flores
Centro de Geociencias, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Querétaro 76230, México
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Elizabeth Chacón
Elizabeth Chacón
Facultad de Ciencias de la Tierra, Universidad Autónoma de Nuevo León, Carretera a Cerro Prieto km 8, Linares, N.L. 67700, México
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Hugo Beraldi-Campesi
Hugo Beraldi-Campesi
Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad de México, D.F 04510, México
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Published:
January 01, 2017

Abstract

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.

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Contents

Geological Society, London, Special Publications

Monogenetic Volcanism

K. Németh
K. Németh
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G. Carrasco-Núñez
G. Carrasco-Núñez
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J. J. Aranda-Gómez
J. J. Aranda-Gómez
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I. E. M. Smith
I. E. M. Smith
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The Geological Society of London
Volume
446
ISBN electronic:
978-1-78620-376-2
Publication date:
January 01, 2017

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