Distribution and historic evolution of the fluvial terraces from Santa Teresa valley Guanajuato
The present work reports the fluvial terraces originated during historical floods throughout the fluvial plain of the Guanajuato river. Six different terraces levels were identified and mapped that correspond to T1 (1,8 m), T2 (3,0 m), T3 (4,2 m), T4 (5,2 m), T5 (6,0 m), T6 (+6,8 m). A sequence anal...
| Autores: | , , , |
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| Tipo de documento: | artigo |
| Estado: | Versão publicada |
| Data de publicação: | 2012 |
| País: | México |
| Recursos: | UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO |
| Repositório: | Investigaciones Geográficas |
| Idioma: | espanhol |
| OAI Identifier: | oai:ojs.pkp.sfu.ca:article/29912 |
| Acesso em linha: | https://www.investigacionesgeograficas.unam.mx/index.php/rig/article/view/29912 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Fluvial terraces Guanajuato anthropogenic sediments fluvial terraces evolution Mesa Central Mexico Terrazas fluviales sedimentos antropogénicos evolución de terrazas fluviales Mesa Central México Río Guanajuato |
| Resumo: | The present work reports the fluvial terraces originated during historical floods throughout the fluvial plain of the Guanajuato river. Six different terraces levels were identified and mapped that correspond to T1 (1,8 m), T2 (3,0 m), T3 (4,2 m), T4 (5,2 m), T5 (6,0 m), T6 (+6,8 m). A sequence analysis of terraces was supported by 2 isotopic C14 dating. The T1 corresponds to the present floodplain, the T2, T3, T4 was formed during periods of extreme floods, between 10 to 100 years in relation to the present. The T5 morphology corresponds to 1905 historical flood. The T6 deposit was followed by a degradation process that was interrupted by a period of increasing sediment budget between 1660 +/-40 to 1905 (T5), during the great mining activity of the Guanajuato Mining District. After 1905 the sediments budget to the Guanajuato River, diminishes substantially, generating a gradual degradation by pulses conforming the T4 to T1 terraces. |
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