Active sinking at the bottom of the Rincón de Parangueo Maar (Guanajuato, México) and its probable relation with subsidence faults at Salamanca and Celaya
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| Format: | Artículo científico |
| Langue: | en |
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Sociedad Geológica Mexicana, A.C.
2013
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| _version_ | 1876436993043333120 |
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| author | José Jorge Aranda-Gómez |
| author_facet | José Jorge Aranda-Gómez |
| contents | Active sinking at the bottom of the Rincón de Parangueo Maar (Guanajuato, México) and its probable relation with subsidence faults at Salamanca and Celaya José Jorge Aranda-Gómez Gilles Levresse Jesús Pacheco Martínez José Alfredo Ramos-Leal Gerardo Carrasco-Núñez Elizabeth Chacón-Baca Gildardo González-Naranjo Gabriel Chávez-Cabello Marina Vega-González Gabriel Origel Cristina Noyola-Medrano Ciencias de la Tierra maar evaporite landslide stromatolite Keywords: drawdown Abstract Rincon de Parangueo is a Quaternary maar that had a perennial lake until the 1980s. The lake was gradually desiccated as a con - sequence of drawdown in the Salamanca-Valle de Santiago regional aquifer and now functions as a playa-lake. In contrast with the features observed in other crater-lakes in the region (La Alberca, Cíntora, and San Nicolás), which also dried up at the same time, the bottom of the Rincón crater displays clear evidence of active deformation associated with mass movement of lake sediments towards the depocenter inside the crater. The most conspicuous topographic feature is a 10 – 12 m high scarp parallel to the former lake coast. The scarp is produced by an annular shaped normal fault system, down towards the depocenter. Evidence of active mass movement is observed along the topographic scarp. Rotational slides associated with rollover anticlines and local grabens produced by antithetic faults are common on the eastern and northern parts of the scarp. Planar slides with open folds at their base occur at western part of the lake basin. Evaporites (trona, thermonatrite, eitelite, halite, and silvite) are abundant in the playa-lake sediments. Their presence makes us believe that a mass removal process is acting as a consequence of salt dissolution and infiltration of the brine towards the aquifer. This process, probably in conjunction with lake sediment compaction and/or diatreme subsidence, may explain the significantly higher fault displacement rate observed inside the crater ( ≈ 50 cm/year ) in comparison with active faults elsewhere in the Salamanca-Valle de Santiago aquifer ( ≈ 6 cm/year ). 2013 artículo científico 1405-3322 https://www.redalyc.org/articulo.oa?id=94348265014 en http://www.redalyc.org/revista.oa?id=943 Boletín de la Sociedad Geológica Mexicana application/pdf Sociedad Geológica Mexicana, A.C. Boletín de la Sociedad Geológica Mexicana (México) Num.1 Vol.65 |
| format | Artículo científico |
| id | redalyc_94348265014 |
| institution | Redalyc |
| language | en |
| publishDate | 2013 |
| publisher | Sociedad Geológica Mexicana, A.C. |
| spellingShingle | Active sinking at the bottom of the Rincón de Parangueo Maar (Guanajuato, México) and its probable relation with subsidence faults at Salamanca and Celaya José Jorge Aranda-Gómez Ciencias de la Tierra maar evaporite landslide stromatolite Keywords: drawdown Active sinking at the bottom of the Rincón de Parangueo Maar (Guanajuato, México) and its probable relation with subsidence faults at Salamanca and Celaya José Jorge Aranda-Gómez Gilles Levresse Jesús Pacheco Martínez José Alfredo Ramos-Leal Gerardo Carrasco-Núñez Elizabeth Chacón-Baca Gildardo González-Naranjo Gabriel Chávez-Cabello Marina Vega-González Gabriel Origel Cristina Noyola-Medrano Ciencias de la Tierra maar evaporite landslide stromatolite Keywords: drawdown Abstract Rincon de Parangueo is a Quaternary maar that had a perennial lake until the 1980s. The lake was gradually desiccated as a con - sequence of drawdown in the Salamanca-Valle de Santiago regional aquifer and now functions as a playa-lake. In contrast with the features observed in other crater-lakes in the region (La Alberca, Cíntora, and San Nicolás), which also dried up at the same time, the bottom of the Rincón crater displays clear evidence of active deformation associated with mass movement of lake sediments towards the depocenter inside the crater. The most conspicuous topographic feature is a 10 – 12 m high scarp parallel to the former lake coast. The scarp is produced by an annular shaped normal fault system, down towards the depocenter. Evidence of active mass movement is observed along the topographic scarp. Rotational slides associated with rollover anticlines and local grabens produced by antithetic faults are common on the eastern and northern parts of the scarp. Planar slides with open folds at their base occur at western part of the lake basin. Evaporites (trona, thermonatrite, eitelite, halite, and silvite) are abundant in the playa-lake sediments. Their presence makes us believe that a mass removal process is acting as a consequence of salt dissolution and infiltration of the brine towards the aquifer. This process, probably in conjunction with lake sediment compaction and/or diatreme subsidence, may explain the significantly higher fault displacement rate observed inside the crater ( ≈ 50 cm/year ) in comparison with active faults elsewhere in the Salamanca-Valle de Santiago aquifer ( ≈ 6 cm/year ). 2013 artículo científico 1405-3322 https://www.redalyc.org/articulo.oa?id=94348265014 en http://www.redalyc.org/revista.oa?id=943 Boletín de la Sociedad Geológica Mexicana application/pdf Sociedad Geológica Mexicana, A.C. Boletín de la Sociedad Geológica Mexicana (México) Num.1 Vol.65 |
| title | Active sinking at the bottom of the Rincón de Parangueo Maar (Guanajuato, México) and its probable relation with subsidence faults at Salamanca and Celaya |
| topic | Ciencias de la Tierra maar evaporite landslide stromatolite Keywords: drawdown |
| url | https://www.redalyc.org/articulo.oa?id=94348265014 |