Organic matter accumulation during the Holocene in the Guadalquivir marshlands (SW Spain)

Organic matter accumulation during the Holocene in the Guadalquivir marshlands (SW Spain)

20 pages, 7 figures, 2 tables.

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Bibliographic Details
Main Authors: Ortiz, José E., Torres, Trinidad José de, López-Pamo, José E., Soler, Vicente, LLamas, Juan F., Barettino, Daniel, García, María J.
Other Authors: CSIC - Instituto Geológico y Minero de España (IGME)
Format: artículo biblioteca
Language:English
Published: John Wiley & Sons 2007-07-17
Subjects:Biomarkers, Magnetic susceptibility, Palaeoenvironment, Guadalquivir marshlands, Spain, Holocene,
Online Access:http://hdl.handle.net/10261/12697
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spelling dig-ipna-es-10261-126972015-05-28T07:49:28Z Organic matter accumulation during the Holocene in the Guadalquivir marshlands (SW Spain) Ortiz, José E. Torres, Trinidad José de López-Pamo, José E. Soler, Vicente LLamas, Juan F. Barettino, Daniel García, María J. CSIC - Instituto Geológico y Minero de España (IGME) Biomarkers Magnetic susceptibility Palaeoenvironment Guadalquivir marshlands Spain Holocene 20 pages, 7 figures, 2 tables. The distribution of biomarker compounds and magnetic susceptibility observed in the sediment from a 20 m core drilled in the marshlands of the estuarine region of the Guadalquivir River (southwest coast of Spain) has allowed us to reconstruct the palaeoenvironmental evolution of this area during the Holocene. Several organic compounds (n-alkanes, n-ketones, n-alkanols, n-alkanoic acids and organic sulphur), as well as different biomarker ratios, have been used to show changing environmental conditions through time. These geochemical proxies suggest good preservation of the organic matter, although some diagenesis has occurred to particular organic compounds, especially the n-alkanoic acids. Our data indicate a major allochthonous supply of terrestrial plants, with less influence from aquatic plants or algae through the core. There are markedly different palaeoenvironmental conditions between the uppermost 5 m (last 6 ka cal. B.P.) and the rest of the core. From 5 m (ca 6 ka cal. B.P.) to 19 m (ca 8 ka cal. B.P.) depth the palaeoenvironmental conditions were almost constant. Based on organic sulphur content and n-alkane content logs, anoxic conditions prevailed from 8 to 6 ka cal. B.P., while oxic conditions with enhanced convection of water (prevalence of fluvial input), and consequently a greater organic matter supply, predominated in the upper 5 m of the core. Similarly, little variation in the magnetic susceptibility profile below 5 m indicates stable environmental conditions, while in the upper 5 m conditions shifted to one with elevated water input and clastic sediment supply. This is linked to palaeofloral alterations in the Guadiamar/Guadalquivir drainage basins and/or anthropogenic effects. We propose that from ca 8 to 6 ka cal. B.P. a stable landscape physiognomy in the surroundings of the estuarine area of the Guadalquivir River, with a predominance of pines and grassland. However, over the last 6 ka cal. B.P. a variation in the terrestrial plant biomarker compounds suggests an alternation of relatively dry and humid phases and/or the impact of human populations on altering the vegetation community have occurred. This project was funded by the Spanish Geological Survey (Instituto Geológico y Minero de España). 2009-04-29T09:58:31Z 2009-04-29T09:58:31Z 2007-07-17 artículo http://purl.org/coar/resource_type/c_6501 Geological Journal 42(5): 547-566 (2007) 0072-1050 http://hdl.handle.net/10261/12697 10.1002/gj.1091 en http://dx.doi.org/10.1002/gj.1091 none 2373 bytes 417870 bytes text/plain application/pdf John Wiley & Sons
institution IPNA ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-ipna-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del IPNA España
language English
topic Biomarkers
Magnetic susceptibility
Palaeoenvironment
Guadalquivir marshlands
Spain
Holocene
Biomarkers
Magnetic susceptibility
Palaeoenvironment
Guadalquivir marshlands
Spain
Holocene
spellingShingle Biomarkers
Magnetic susceptibility
Palaeoenvironment
Guadalquivir marshlands
Spain
Holocene
Biomarkers
Magnetic susceptibility
Palaeoenvironment
Guadalquivir marshlands
Spain
Holocene
Ortiz, José E.
Torres, Trinidad José de
López-Pamo, José E.
Soler, Vicente
LLamas, Juan F.
Barettino, Daniel
García, María J.
Organic matter accumulation during the Holocene in the Guadalquivir marshlands (SW Spain)
description 20 pages, 7 figures, 2 tables.
author2 CSIC - Instituto Geológico y Minero de España (IGME)
author_facet CSIC - Instituto Geológico y Minero de España (IGME)
Ortiz, José E.
Torres, Trinidad José de
López-Pamo, José E.
Soler, Vicente
LLamas, Juan F.
Barettino, Daniel
García, María J.
format artículo
topic_facet Biomarkers
Magnetic susceptibility
Palaeoenvironment
Guadalquivir marshlands
Spain
Holocene
author Ortiz, José E.
Torres, Trinidad José de
López-Pamo, José E.
Soler, Vicente
LLamas, Juan F.
Barettino, Daniel
García, María J.
author_sort Ortiz, José E.
title Organic matter accumulation during the Holocene in the Guadalquivir marshlands (SW Spain)
title_short Organic matter accumulation during the Holocene in the Guadalquivir marshlands (SW Spain)
title_full Organic matter accumulation during the Holocene in the Guadalquivir marshlands (SW Spain)
title_fullStr Organic matter accumulation during the Holocene in the Guadalquivir marshlands (SW Spain)
title_full_unstemmed Organic matter accumulation during the Holocene in the Guadalquivir marshlands (SW Spain)
title_sort organic matter accumulation during the holocene in the guadalquivir marshlands (sw spain)
publisher John Wiley & Sons
publishDate 2007-07-17
url http://hdl.handle.net/10261/12697
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