Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/163031
Share/Export:
logo share SHARE logo core CORE BASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Title

Environmental changes recorded in the Holocene sedimentary infill of a tropical estuary

AuthorsKumar, Mukesh; Boski, Tomasz; Lima‐Filho, Francisco P.; Bezerra, Francisco H.R.; González-Vila, Francisco Javier CSIC ORCID ; González-Pérez, José Antonio CSIC ORCID
KeywordsAnalytical pyrolysis
Sea level change
Holocene
Vegetation biomarkers
Paleoenvironmental conditions
Issue Date21-Mar-2018
PublisherElsevier
CitationQuaternary International (2018) Article in Press
AbstractEarly-to late Holocene sedimentary infill of the Potengi-Jundiai Estuary (Brazil) was studied in a 31.5 m long sediment core. The borehole was drilled in a mangrove area within the central part of the flood tide delta. The sedimentary record, encompassing the last 10 kyr, was studied for sediment texture and for the n-alkanes composition of organic matter (OM). Sediments rich in OM and bivalve shells accumulated during the period of sea-level rise, mostly in an intertidal environment of mangrove forest, mudflat and subtidal estuarine flood delta. The characterization of n-alkanes (C10-C33) and lignin methoxyphenols by means of direct analytical pyrolysis (Py-GC/MS) technique allowed determining the sources of the extant OM. Downcore fluctuations were observed in n-alkanes and in several n-alkane based indices, such as long chain carbon preference index (CPI C24-C33), long to short chain ratio (L/S) and average chain length (ACL), as well as in the relative proportion of lignin derived compounds. The n-alkanes distribution points to changing sources of OM input to the estuarine sediments over most of the Holocene period. Major inputs of terrestrial vegetation alternated with periods of mixed input from aquatic macrophytes as the rate of sea-level rise changed over time. The n-alkanes distribution and the lignin markers were useful for reconstructing paleoenvironmental conditions, particularly during the early Holocene when the lower Potengi River valley (now an estuarine area) could accommodate terrestrial forest vegetation before switching to halophytic mangroves as sea levels rose.
Description12 páginas.-- 7 figuras.-- 2 tablas.-- 79 referencias.-- Supplementary data related to this article can be found at https://doi.org/10.1016/j.quaint.2018.03.006 .--
Publisher version (URL)http://dx.doi.org/10.1016/j.quaint.2018.03.006
URIhttp://hdl.handle.net/10261/163031
DOI10.1016/j.quaint.2018.03.006
ISSN1040-6182
Appears in Collections:(IRNAS) Artículos




Files in This Item:
File Description SizeFormat
Environmental_changes_recorded_2018_postprint.pdf695,54 kBAdobe PDFThumbnail
View/Open
Show full item record
Review this work

SCOPUSTM   
Citations

11
checked on May 19, 2022

WEB OF SCIENCETM
Citations

11
checked on May 22, 2022

Page view(s)

336
checked on May 25, 2022

Download(s)

278
checked on May 25, 2022

Google ScholarTM

Check

Altmetric

Dimensions


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.