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Sea-level rise episodes during the Holocene in the Potengi¿Jundiai Estuary, NE Brazil inferred from direct analytical pyrolysis (Py-GC/MS) of sediments

AuthorsKumar, Mukesh; Boski, Tomasz; Lima‐Filho, Francisco P.; Bezerra, Francisco H.R.; González-Vila, Francisco Javier CSIC ORCID ; Jiménez Morillo, N. T. CSIC ORCID; González-Pérez, José Antonio CSIC ORCID
Issue Date17-Sep-2017
PublisherEuropean Association of Organic Geochemists
Citation28th International Meeting on Organic Geochemistry 17 – 22 September 2017, Florence, Italy
AbstractUnderstanding sea-level changes on various time-scales is important because it is usually associated to climate changes (Milne, 2008). 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 (Eglinton and Eglinton, 2008). 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 (31.5 m depth). This technique has been previously used to monitor past environmental changes in the area (Boski et al., 2015a). The core was drilled in the area of central flood delta of Potengi-Jundiai estuary, through the sedimentary sequence accumulated since ca 10 kyr cal BP (Boski et al., 2015b). Direct pyrolysis was performed in a double-shot pyrolyzer (Frontier Lab 2020i) attached to a GC/MS system (Agilent 6890N + 5973MSD). Detailed chromatographic conditions can be found elsewhere (Boski et al., 2015a). In short, samples were thoroughly homogenized and samples introduced (1 mg) into a preheated micro-furnace at 500 ºC for 1 min and evolved gases transferred to the GC/MS for analysis. Compounds assignment was done via single-ion monitoring and by comparison with published and stored (NIST and Wiley libraries) data.
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