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Analytical pyrolysis (Py‐GC/MS) of sediments: sea‐level rise episodes During the holocene in the potengi–jundiai estuary, ne brazil

AutorKumar, Mukesh; Boski, Tomasz; Lima‐Filho, Francisco P.; Bezerra, Francisco H.R.; González-Vila, Francisco Javier ; González-Pérez, José Antonio
Fecha de publicaciónnov-2016
EditorSociedad Española de Cromatografía y Técnicas Afines
CitaciónAdvances in chromatography and related techniques: Book of Abstracts 178-178 (2016)
ResumenUnderstanding sea‐level changes on various time‐scales is important because it is usually associated to climate changes [1]. Sediments in estuaries may retain a continuous record of climatic and environmental markers surrogated to factors like relative sea level (RSL), vegetation cover, and connectivity with the open ocean. Sediments accumulated since the last glacial maximum (LGM; c. 20 kyr.) are particularly informative and encompass valuable information to infer accurate RSL curves. Lipid biomarkers are preserved in sediments and include molecular markers like n‐alkanes and n‐alkanoic acids increasingly used for paleoclimate and paleoenvironmental reconstructions [2]. In this communication analytical pyrolysis (Py‐GC/MS) is used to study the structure of organic matter (OM) contained in dated sediments from core IG‐8 (31 m depth). This technique has been previously used to monitor past environmental changes in the area [3]. The core was drilled in the area of central flood delta of Potengi‐Jundiai estuary, through the sedimentary sequence accumulated since ca 9,8 kyr cal BP [4]. Marked compositional differences between the OM of different ages were found. Specifically the n‐alkane series were found particularly informative in discriminating OM sources (terrigenous vs marine). In the surface, the alkane series is characterized by a high average chain length (ACL) value indicating a clear influence from terrestrial vegetation. From 6.5 to 11.5 m depth an increase in the terrigenous contribution is observed by an increase in ACL values in correspondence with δ13C depletion. At 22.8 m depth and at 26.6 m there are again inputs from terrestrial plants, but for short periods of Time. Bellow 26.6 m the influence is marine and ends at 29.45 m with a neat alteration of sediment isotopic signature with a δ13C enriched layer with no organic markers and indicating the occurrence of sedimentary conditions favouring carbonate formation. Below this depth, the OM in the sediments shows a conspicuous terrestrial influence (depleted conductivity and δ13C and increase in alkanes ACL and long vs short chain length (L/S) ratio) that increase towards bottom of the core down at 30.95 m. This possibly indicates a drastic sea‐level change during this period of time.
[1] G. Milne, A&G 49 (2008) 2.24‐2.28. (doi: 10.1111/j.1468‐4004.2008.49224.x) [2] T.I. Eglinton, G. Eglinton, Earth Planet. Sc. Lett. 275 (2008) 1‐16. (doi: 10.1016/j.epsl.2008.07.012) [3] T. Boski, R.J. Angulo, M.C. Sousa Bezerra, E.G. Barboza, H. Knicker, J.A. González‐Pérez, F.J. González‐Vila, J. Quat. Sc. 30 (2015) 9‐18. (doi: 10.1002/jqs.2753) [4] T. Boski, F.H.R. Bezerra. L.F. Pereira, A.M. Souza, R.P. Maia, F.P. Lima‐Filho, Marine Geol. 365 (2015) 1‐13. (doi: 10.1016/j.margeo.2015.04.
DescripciónPóster presentado en el la XVI Reunión Científica de la Sociedad Española de Cromatografía y Técnicas Afines (SECyTA2016) P‐ENV‐31
Eds: González-Pérez, José Antonio.-- Almendros Martín, Gonzalo.-- González-Vila, Francisco Javier.-- Rosa Arranz, José M. de la
Versión del editorhttp://hdl.handle.net/10261/139608
URIhttp://hdl.handle.net/10261/140529
ISBN978-84-617-6155-5
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