Por favor, use este identificador para citar o enlazar este ítem: http://repositoriodigital.ipn.mx/handle/123456789/13722
Título : Geochemistry of Modern Sediments from San Quintín Coastal Lagoon, Baja California: Implication for Provenance
Autor : Daesslé, Luis Walter
Rendón-Márquez, Gabril
Camacho-Ibar, Victor F.
Gutiérrez-Galindo, Efraín A.
Shumilin, Evgueni
Ortíz-Campos, Eduardo
Palabras clave : Coastal Lagoon
Heavy Minerals
San Quintín
Fecha de publicación : 1-ene-2009
Editorial : Revista Mexicana de Ciencias Geológicas
Resumen : A detailed regional grid of 97 surficial sediment samples is studied for the San Quintín coastal lagoon, which is a shallow embayment located adjacent to a “regionally-rare” intraplate-type basaltic terrain known as San Quintín volcanic fi eld. The infl uence that this unique lithology and other potencial sources have on the recent sediment geochemistry is discussed on the basis of geochemical, petrographic and sedimentological results. The sandy silts and silts in the lagoon are enriched in ferromagnesian minerals such as pyroxenes and hornblende, which form up to 6 and 22%, respectively, of the total mineral count in the sandfraction. These relatively immature feldspathic sediments are characterized by the presence of abundant angular plagioclase (25–60%) and absence of lithics. The La-Sc-Th and Cr-Sc-Th discrimination diagrams suggest that mafic ferromagnesian minerals have a signifi cant effect on the geochemical variance of the sediments. The Cr/Th (median=28) and Co/Th (median=59) ratios are similar to those reported for sands derived from basic rocks. A mafic provenance is probably responsable for the statistical association of Fe, Hf, U, Th, Sc, Cr, Ca, Na and the rare earth elements. An association of Fe, organic carbon and total P with the trace elements Sb, Cr, Br, As, Na, Sc and Co indicates that their distribution is mainly controlled by the presence of Fe-rich minerals, such as hornblende, and organic matter throughout Bahía San Quintín and the northernmost Bahía Falsa, beneath aquaculture racks. Low enrichment factors (<1) for Cr, Sb, As and P indicate that anthropogenic contaminant sources derived from agrochemicals are not significant.
URI : http://www.repositoriodigital.ipn.mx/handle/123456789/13722
ISSN : 1026-8774
Aparece en las colecciones: Artículos

Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
Daesslé_Luis_Walter_2009_Revista_Mexicana_de_Ciencias_Geológicas_2612.pdf60.61 kBAdobe PDFVisualizar/Abrir

Los ítems de DSpace están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.