Krishnamurthy, R V; Meyers, Philip A; Lovan, Norman A (2000): Concentrations of organic carbon and organic matter isotopic compositions of sapropels and adjacent marls from ODP Hole 161-974B in the Tyrrhenian Basin (Table 1) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.722571, Supplement to: Krishnamurthy, RV et al. (2000): Isotopic evidence of sea-surface freshening, enhanced productivity, and improved organic matter preservation during sapropel deposition in the Tyrrhenian Sea. Geology, 28(3), 263-266, https://doi.org/10.1130/0091-7613(2000)28%3C263:IEOSFE%3E2.0.CO;2
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Abstract:
Multiple layers of sapropels occur widely in the sedimentary record of the Mediterranean Sea and record repetitions of paleoclimatic conditions that favored increased production and preservation of marine organic matter. A combination of hydrogen and carbon isotope analyses of Pleistocene sapropels from the Tyrrhenian Sea reveals new aspects of the factors leading to their deposition. Organic matter dD values that are significantly more negative in sapropels than in adjacent marls indicate a combination of dilution of surface waters by meteoric waters and increased burial of lipid-rich organic matter during periods of sapropel deposition. Organic d13C values in sapropels that are less negative than those in marls suggest periods of markedly elevated marine biological production. The opposite but concordant excursions of these two isotopic parameters imply that the sapropel layers formed from increased export of marine organic matter from the photic zone to the sea floor during periods of greater fluvial delivery of continental nutrients to the Mediterranean Sea. Furthermore, the isotopic evidence indicates that periods of wetter climate were widespread in southern Europe at the same times as in northern Africa.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 40.356100 * Longitude: 12.141950
Date/Time Start: 1995-05-07T17:00:00 * Date/Time End: 1995-05-08T23:45:00
Minimum DEPTH, sediment/rock: 19.16 m * Maximum DEPTH, sediment/rock: 87.31 m
Event(s):
161-974B * Latitude: 40.356100 * Longitude: 12.141950 * Date/Time Start: 1995-05-07T17:00:00 * Date/Time End: 1995-05-08T23:45:00 * Elevation: -3465.0 m * Penetration: 203.7 m * Recovery: 208.23 m * Location: Tirreno Sea * Campaign: Leg161 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 22 cores; 203.7 m cored; 0 m drilled; 102.2 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | Depth, composite | Depth comp | mcd | Krishnamurthy, R V | ||
| 3 | Sample code/label | Sample label | Krishnamurthy, R V | DSDP/ODP/IODP sample designation | ||
| 4 | Lithology/composition/facies | Lithology | Krishnamurthy, R V | |||
| 5 | Code | Code | Krishnamurthy, R V | sapropel code | ||
| 6 | AGE | Age | ka BP | Geocode | ||
| 7 | Carbon, organic, total | TOC | % | Krishnamurthy, R V | ||
| 8 | δ Deuterium | δD | ‰ SMOW | Krishnamurthy, R V | Isotope ratio mass spectrometry | |
| 9 | δ13C, organic carbon | δ13C Corg | ‰ PDB | Krishnamurthy, R V | Isotope ratio mass spectrometry |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
187 data points