Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/18572
Share/Export:
logo share SHARE logo core CORE BASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Title

Pliocene–Holocene evolution of depositional conditions in the eastern Mediterranean: Role of anoxia vs. productivity at time of sapropel deposition

AuthorsGallego-Torres, David; Martínez Ruíz, Francisca C. CSIC ORCID; Paytan, Adina; Jiménez Espejo, Francisco J.; Ortega-Huertas, M.
KeywordsSapropel
Eastern Mediterranean
Redox proxies
Productivity
Anoxia
Issue Date6-Apr-2007
PublisherElsevier
CitationPalaeogeography, Palaeoclimatology, Palaeoecology 246(2-4): 424-439 (2007)
AbstractA multiproxy geochemical study of nine sapropel layers from ODP Hole 964A, ODP Leg 160 in the eastern Mediterranean spanning the Pliocene–Holocene time interval provides new insights into the evolution of sapropel deposition. Paleoenvironmental proxies were used for reconstruction of productivity (Ba derived from marine barite), oxygen conditions (trace metal ratios) and sedimentary regime (clay minerals, detrital elements). These proxies reveal a significant increase in river runoff relative to decreasing aeolian input during sapropel deposition over the whole time interval. Ba excess supports the argument that a significant increase in export productivity is the main triggering mechanism for sapropel deposition, although preservation also played an important role. Furthermore, major differences exist in depositional conditions, including both oxygenation and productivity since the Pliocene. Productivity fluctuated substantially and was higher during the Pliocene and Pleistocene than during the Holocene; at the same time decreasing oxygen availability parallels the enhanced productivity. Dysoxic to anoxic conditions appear to coincide with marine productivity maxima, thus suggesting that oxygen depletion may be linked to greater consumption rather than restricted circulation. This correspondence supports the hypothesis that productivity fluctuations resulting from climate oscillations were the main cause of enhanced organic matter contents and also a main controlling factor for reduced oxygen availability.
Description16 pages, 2 tables, 7 figures.
Publisher version (URL)http://dx.doi.org/10.1016/j.palaeo.2006.10.008
URIhttp://hdl.handle.net/10261/18572
DOI10.1016/j.palaeo.2006.10.008
ISSN0169-8095
Appears in Collections:(IACT) Artículos

Show full item record
Review this work

SCOPUSTM   
Citations

95
checked on May 11, 2022

WEB OF SCIENCETM
Citations

78
checked on May 10, 2022

Page view(s)

416
checked on May 15, 2022

Google ScholarTM

Check

Altmetric

Dimensions


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