Data/hora: 01/06/2024 10:22:23

Provedor de dados: | 20
País: | Belgium

Título:

Distribution and Depositional History of some Pre-lagoonal Holocene Sediments in the Ciénaga Grande de Santa Marta, Colombia

La distribución y la historia de depositación de algunos sedimentos pre-lagunares del Holoceno en la Ciénaga Grande de Santa Marta, Colombia

Autores: | Cohen, A.D.; Wiedemann, H.U.
Data: | 2009-11-26
Ano: | 1973
Palavras-chave: | Coastal lagoons; Estuaries; Geology; Sediments; Waste disposal; Estuaries; Geology; Waste disposal; Coastal lagoons; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_3232; Http://aims.fao.org/aos/agrovoc/c_8305; Http://aims.fao.org/aos/agrovoc/c_1697.
Resumo: | An investigation of the pre-lagoonal Holocene sediments beneath the lagoon Cienaga Grande de Santa Marta (Colombia), was undertaken for the purpose of this region before the formation of the lagoon proper. Core and grab samples were collected from the lagoon for stratigraphic observatiion and analysis in the laboratory.  Beneath the recent lagoonal sediments a deposits of peat with intercalated sand and clay was discovered. Its surface lies at a depth of about 2 m below the hydrographic zero level of the lagoon. Three peat samples, obtain from the upper portion of this deposits, were subjected to micropetrographic and pollen analyses. These analyses reveled that, prior to marine inundation, this region in southern Florida (U.S.A.) Sample "f", taken closest to the present sea, represents a red mangrove (Rhizophorae mangle) dominated zone, which to sweep the sediment surface clean to litter. This implies that the Isla de Salamanca, an almost continuous beach barrier between the present-day lagoon and Caribbean Sea, must not have been as prominent a barrier as it is today, but that a larger inlet existed sample "g", represent a mixed mangrove zone which was somewhat less exposed to current scour and which was presumably situated behind and propected by the former zone. The third sample "h", taken the furthest inland, represents ponded condictions within a slightly brackish to fresh water marsh dominated by leatherleaf fern (Acrostichum aureum) and sedges.
Tipo: | Journal Contribution
Idioma: | Inglês

Identificador:

Boletín de investigaciones marinas y costeras, (7). p. 139-154

0122-9761

http://hdl.handle.net/1834/3246

Editor: | INVEMAR, Santa Marta (Colombia)
Relação: | http://www.invemar.org.co/siad/descarga.jsp?type=documento&amp;id=592