Sedimentology and geochemical analyses of Pliocene to Holocene sediments of ODP Hole 160-964A in the eastern Mediterranean Sea (Appendix), supplement to: Gallego-Torres, David; Martinez-Ruiz, Francisca C; Paytan, Adina; Jiménez-Espejo, Francisco Jose; Ortega-Huertas, M (2007): Pliocene-Holocene evolution of depositional conditions in the eastern Mediterranean: Role of anoxia vs. productivity at time of sapropel deposition. Palaeogeography, Palaeoclimatology, Palaeoecology, 246(2-4), 424-439

DOI

A 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.

Identifier
DOI https://doi.org/10.1594/PANGAEA.693913
Related Identifier https://doi.org/10.1016/j.palaeo.2006.10.008
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.693913
Provenance
Creator Gallego-Torres, David; Martinez-Ruiz, Francisca C; Paytan, Adina; Jiménez-Espejo, Francisco Jose; Ortega-Huertas, M
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2007
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Language English
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 3582 data points
Discipline Earth System Research
Spatial Coverage (17.750 LON, 36.260 LAT); Eastern Basin
Temporal Coverage Begin 1995-03-17T20:14:00Z
Temporal Coverage End 1995-03-18T21:30:00Z