Resumo

CHAVEZ LOPEZ, Saúl  e  ALVAREZ ARELLANO, Alejandro D.. Batimetry, sediments and depositional environments in Guásimas lagoon, Sonora, Mexico. Invest. Geog [online]. 2006, n.60, pp.7-21. ISSN 2448-7279.

Guásimas, is located on the coastal plain of Sonora State. Its batimetry, sedimentary facies distribution and depositional environments were determined. Conventional widely recognized fiela, laboratory and studio techniques were used to process the samples. Three areas related with the depth and distribution of sedimentary facies were identified: the sizes of thick sand moderately selected they are in the entrance where the depth goes from 0.5 to 10 m, changing to very fine sand poorly selected toward the north (Estero Bachoco), where the depth is from 0.5 to 3 m, and to half silt very bad selected toward the south (Estero Mapoli) with 0.5 to 1 m of depth. This arrangement is typical of coastal lagoon and it is associated to the currents of water inside the lagoon environment, which was interpted using the parameter of skewness (SK), like depositional environments of high, medium and low energy, coherent with the batimetry and geomorphology. Even though it was not possible to identify depositional signals generated by agents and mechanisms of transport clearly, but we coula recognize the gradation from one environment to another and the textural characteristics of the different sedimentary facies.

Palavras-chave : Lagoon; batimetry; sediments; depositional environments.