Afinidad Limnológica del Sistema Lagunar Costero del estado de Guerrero, México

Arroyo, Mariana; Ontiveros, S Manon; Pérez, M.A Ortíz

doi:10.14350/rig.59402

Cited by 4 publications

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“…Laguna Mitla is 21 km long and averages 2 km in width. It is shallow, about 1.6 m in depth on average and less than 3 m in the deepest part of the lagoon (Guzman-Arroyo et al, 1986). Alluvial sediment input is limited and extensive fringes of mangrove, grassy marshes and 'salinas' (salt pans) have developed around the lagoon margins.…”

Section: Geomorphologymentioning

confidence: 99%

Sedimentary record of late-Holocene relative sea-level change and tectonic deformation from the Guerrero Seismic Gap, Mexican Pacific Coast

et al. 2007

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Studies of the coastal sedimentary record have allowed both the reconstruction of relative sea-level changes and the determination of local rates and magnitudes of tectonic deformation, particularly in tectonically active areas. Despite their successful use elsewhere, studies of this type are much less common for the Mexican Pacific coast, which parallels the Cocos-North America subduction plate boundary. Stratigraphic, geochemical and microfossil data from sediments in Laguna Mitla, the Pacific coast of Guerrero, Mexico, document late-Holocene sea-level changes induced by tectonic activity in the Mexican subduction zone. Three major events are identified. First, the formation of the lagoon by c. 4630 yr BP, as indicated by a freshwater to brackish peat. Second, a relative sea-level rise, or land subsidence, as indicated by a shift from a freshwater marginal lagoon environment to a marine setting, preceded by a marine inundation represented by a sand unit (possibly a tsunami deposit), by c. 3400 yr BP. And finally, a return to lagoonal conditions indicating a drop in relative sea level or coastal uplift by c. 2300 yr BP. The Laguna Mitla stratigraphy indicates general coastal subsidence or relative sea level rise of c. 1 mm/yr. We argue that these relative sea-level (land-level) changes have been induced by tectonic activity associated with the Mexican megathrust. A plausible explanation for the 3400 yr BP marine inundation is probably a tsunami produced by a large seismic event accompanied by coastal subsidence. Discrete fining upward, fine to coarse, sand units with an erosional basal contact, medium to poor sorting, and clay/mud rip-up clasts; an increase in Na and Sr elemental concentrations, indicative of a marine origin; and the landward extent of the sands support a tsunamigenic source for these deposits. However, these apparent tsunami deposits require further study to determine their lateral extent and to assess whether they can be correlated from one site to another. This study demonstrates the applicability of a multiproxy sedimentary approach in interpreting relative sea-level (land-level) changes and to derive data on related earthquake and tsunami events in tropical coastal lagoons.

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Section: Geomorphologymentioning

confidence: 99%

Sedimentary record of late-Holocene relative sea-level change and tectonic deformation from the Guerrero Seismic Gap, Mexican Pacific Coast

et al. 2007

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“…Algunos remanentes de estos cordones litorales forman una isla, isla Magueyes, dentro de la laguna. Mitla es una laguna somera de 1,6 m a 3 m de profundidad (Guzmán-Arroyo et al, 1986). Tiene 21 km de largo y 2 km aproximadamente de ancho.…”

Section: Resultsunclassified

Evidencias ambientales de cambios de nivel de la costa del Pacífico de México: terremotos y tsunamis

Ramírez‐Herrera¹

2011

Rev. geogr. Norte Gd.

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RESUMENEl estudio de sismos y tsunamis prehistóricos usando evidencias ambientales de cambios de nivel de la costa, donde se conservan los cambios abruptos de ambientes terrestres a marinos y viceversa, y los depósitos de tsunamis han proporcionado información valiosa en la evaluación del peligro por sismos y tsunamis. La costa del Pacífico mexicano es tectónicamente activa y ha experimentado numerosos sismos de magnitud grande (M>7.5) en tiempos históricos, frecuentemente acompañados por cambios en el nivel de la costa y tsunamis (>50 documentados desde 1732). Utilizando el estudio de caso de lagunas y marismas tropicales de la costa de Guerrero, mediante el enfoque proxy que integra geomorfología, estratigrafía, geoquímica, microfósiles y datación radiométrica, se muestra la posibilidad de documentar cambios de nivel de la costa inducidos tectónicamente. El método utilizado confirma evidencias de cambios ambientales que demuestran un probable terremoto acompañado de subsidencia de la costa y de un tsunami a los ca. 3400-3500 A.P. En general, la mayoría de los cambios relativos de nivel del mar observados en el Holoceno obscurecen cualquier señal climática durante este periodo en la costa mexicana del Pacífico. ABSTRACTThe study of prehistoric earthquakes and tsunamis using environmental evidence of coastal level changes, where sudden changes from terrestrial to marine environments, and vice versa, and where tsunami deposits are preserved, has provided valuable information in the earthquake and tsunami hazard assessment. The Pacific coast of Mexico is tectonically active and has experienced numerous large magnitude earthquakes (M > 7.5) in historical times, frequently accompanied by coastal-level changes and tsunamis (> 50 tsunamis recorded since 1732). Using the case study of tropical lagoons and marshes on the Guerrero coast, it is shown the feasibility of recording tectonically induced coastal level changes through the proxy method that integrates geomorphic, stratigraphic, geochemical, microfossil, and radiometric data. The applied method confirms evidence for environmental changes indicative of coastal subsidence and a potential great earthquake and tsunami by ca. 3400-3500 yr BP. In general, most of the Holocene relative sea-level changes observed obscure any climatic signal in this period on the Mexican Pacific coast.

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“…Hidrología de la laguna: la cuenca lagunar de Coyuca es una de las 123 lagunas costeras de México (Lankford 1977) porción centro-sur del Pacífico mexicano, y se caracteriza por ser de boca efímera y estar separada del mar por una barrera de arena (Yáñez-Arancibia 1976, Guzmán-Arroyo et al 1986). Tiene alrededor de 10.5 km de longitud y 4.5 km en su parte más ancha y una profundidad máxima de 18 m en la región central (Fig.…”

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“…2) (Ramírez-Granados 1952). Aproximadamente el 50 % del área lagunar presenta profundidades menores a 4 m; en su porción occidental la cuenca recibe los aportes del río Coyuca, que tiene una descarga anual de 975.6 x 10 6 m 3 de agua al año que proviene de las montañas (Guzmán-Arroyo et al 1986) y es la fuente de mayor aporte a la laguna. Esta recibe también las aguas del Río Conchero ubicado en la parte sur-oriental, cuya reducida aportación se limita a la época de lluvias (Román-Contreras 1991, Fonseca y Lozada-Pérez 1993.…”

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Efectos del huracán "Pauline" (1997) sobre la fauna asociada a la planta Eichhornia crassipes en la Laguna Coyuca, Pacífico Sur de México

Román-Contreras

Rocha–Ramírez

Cházaro–Olvera

2007

RBT

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Effects of hurricane "Pauline" (1997) on the fauna associated with the plant Eichhornia crassipes in Laguna Coyuca, South Pacific of Mexico. Reports on the effects of hurricanes on marine and coastal environments often deal with coral reefs, but little is known about their effect on the communities associated with the water hyacinth, Eichhornia crassipes. From January 1997 (pre-hurricane) through April 1998 (post-hurricane) we made montly collections of fauna in E. crassipes roots from Laguna Coyuca, Mexico (17º00'-16º54' N, 99º58'-100º05' W). The hurricane affected Coyuca on October 9 th , 1997 and caused mortalities of that fauna. During the three subsequent months the absence of E. crassipes and its associated fauna in the study area was evident, but in January 1998, we found a partial reestablishment of E. crassipes and its associated fauna. Four months later, this community was almost back to pre-hurricane levels. Rev. Biol. Trop. 56 (2) Los efectos de huracanes en distintas áreas geográficas y comunidades de ambientes marinos y costeros han sido reportados desde hace muchos años. Entre ellos las evaluaciones en los arrecifes de coral son las que mayor atención han recibido

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Afinidad Limnológica del Sistema Lagunar Costero del estado de Guerrero, México

Cited by 4 publications

References 0 publications

Sedimentary record of late-Holocene relative sea-level change and tectonic deformation from the Guerrero Seismic Gap, Mexican Pacific Coast

Sedimentary record of late-Holocene relative sea-level change and tectonic deformation from the Guerrero Seismic Gap, Mexican Pacific Coast

Evidencias ambientales de cambios de nivel de la costa del Pacífico de México: terremotos y tsunamis

Efectos del huracán "Pauline" (1997) sobre la fauna asociada a la planta Eichhornia crassipes en la Laguna Coyuca, Pacífico Sur de México

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