The sapropel record of the eastern Mediterranean Sea; results of Ocean Drilling Program Leg 160

Author(s): Emeis, Kay-Christian; Sakamoto, Tatsuhiko; Wehausen, Rolf; Brumsack, Hans-Jürgen
Author Affiliation(s): Primary:
Institut für Ostseeforschung Warnemünde, Warnemunde, Federal Republic of Germany
Other:
ETH-Zentrum, Switzerland
Hokkaido University, Sapporo, Japan
University of Oldenburg, Oldenburg, Federal Republic of Germany
Volume Title: Mediterranean sapropels; observations, interpretations and models
Volume Author(s): Cita, Maria Bianca, editor; McKenzie, Judith A.
Source: Palaeogeography, Palaeoclimatology, Palaeoecology, 158(3-4), p.371-395; International conference on Neogene Mediterranean palaeoceanography; cycles, events and sea level, Erice, Italy, Sept. 1997, edited by Maria Bianca Cita and Judith A. McKenzie. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0031-0182 CODEN: PPPYAB
Note: In English. 54 refs.; illus., incl. 4 tables, sketch map
Summary: Research on sediments recovered during Ocean Drilling Leg 160 has concentrated on two issues: the first concerned the stratigraphy of sapropel formation, the second was oriented to clarify specific processes that explain sapropel origin. Progress has been made in the construction of stratigraphic composites out of sedimentary sequences from individual holes at each of the palaeoceanographic sites. On the composites, initial work has resulted in the establishment of high-resolution and intermediate-resolution stratigraphies for three sites (963, 964, 967); correlation of sedimentary cycles to astronomical (insolation) cycles extends the stratigraphies to Sites 969 and 966. The sapropel occurrences in the marine and land sequences over the entire Eastern Mediterranean are correlated; with the resolution that can be obtained from isotope studies, groups of sapropels occurred simultaneously over the entire basin. In detail, however, the temporal and facies patterns of sapropel sequences differ between individual sites and depositional basins. The differences may be related to effects of water depth, diagenesis, and post-depositional tectonic attenuation of sequences. Studies on the geochemistry and facies of sapropels agree that anoxic conditions favoured preservation of organic matter in sapropels, caused the enrichment of trace metals associated with sapropels, and helped to preserve primary sedimentary structures. Besides, all evidence is consistent with elevated fluxes of organic matter and associated elements during sapropel events. Abstract Copyright (2000) Elsevier, B.V.
Year of Publication: 2000
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Anaerobic environment; Biomarkers; Cenozoic; Correlation; Depositional environment; Diagenesis; East Mediterranean; Foraminifera; Globigerinacea; Globigerinidae; Globigerinoides; Globigerinoides ruber; Invertebrata; Isotope ratios; Isotopes; Leg 160; Marine environment; Marine sediments; Mediterranean Sea; Microfossils; Neogene; O-18/O-16; ODP Site 964; ODP Site 966; ODP Site 967; ODP Site 969; Ocean Drilling Program; Organic compounds; Oxygen; Pleistocene; Pliocene; Productivity; Protista; Quaternary; Rotaliina; Sapropel; Sea-surface temperature; Sediments; Stable isotopes; Tertiary
Coordinates: N361538 N361538 E0174500 E0174500
N335024 N335024 E0245300 E0245300
N340411 N340411 E0324331 E0324331
N334748 N334748 E0324205 E0324205
Record ID: 2000045809
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands