Not logged in
PANGAEA.
Data Publisher for Earth & Environmental Science

Lückge, Andreas; Boussafir, Mohammed; Lallier-Verges, Elisabeth; Littke, Ralf (1996): Organic matter preservation in sediments of the Peru and Oman continental margin [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.757241, Supplement to: Lückge, A et al. (1996): Comparative study of organic matter preservation in immature sediments along the continental margins of Peru and Oman. Part I: results of petrographical and bulk geochemical data. Organic Geochemistry, 24(4), 437-451, https://doi.org/10.1016/0146-6380(96)00045-9

Always quote citation above when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

Abstract:
Detailed petrographical and bulk geochemical investigations of organic matter (OM) have been performed on sediments deposited below or close to upwelling areas offshore Peru (ODP-Leg 112; Sites 679, 681, 688) and Oman (ODP-Leg 117; Sites 720, 723, 724) in order to obtain a quantitative understanding of its accumulation and degradation. Microscopical as well as nanoscopical investigations reveal that the OM in sediments affected by upwelling mechanisms mainly (up to 98%) consists of unstructured (amorphous) organic aggregates without any apparent biological structures. In sediments which are not or to a lesser extent affected by upwelling (Site 720) terrestrial OM predominates.
Organic carbon (TOC) contents are highly variable and range between 9.8% in sediments deposited below upwelling cells and 0.2% in sediments outside the upwelling zone. The TOC/sulphur ratios of the sediments scatter widely. The samples from the deep-water locations (Sites 688 and 720), show C/S-ratios of "normal" marine sediments, whereas at the other locations no correlation or even a negative correlation between sulphur and TOC concentration exists. In most of the upwelling-influenced sediments OM contains a significant amount of sulphur. The incorporation of sulphur into the OM followed microbial sulphate reduction and occurred in the upper meters of the sedimentary column. Below, OM is still present in vast amounts and relatively hydrogen-rich, but is nevertheless non-metabolizable and becomes the limiting factor for bacterial sulphate reduction.
According to mass balance calculations 90-99% of the OM produced in the photic zone was remineralized and 1-3% was consumed by microbial sulphate reduction. The aerobic and anaerobic processes have greatly affected degradation and conservation of OM.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 2.913228 * Median Longitude: -11.546340 * South-bound Latitude: -11.537733 * West-bound Longitude: -78.943100 * North-bound Latitude: 18.462500 * East-bound Longitude: 60.744000
Date/Time Start: 1986-11-01T12:45:00 * Date/Time End: 1987-09-21T00:00:00
Event(s):
112-679D * Latitude: -11.063830 * Longitude: -78.272170 * Date/Time Start: 1986-11-01T12:45:00 * Date/Time End: 1986-11-02T13:15:00 * Elevation: -462.0 m * Penetration: 245.4 m * Recovery: 116.03 m * Location: South Pacific Ocean * Campaign: Leg112 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 27 cores; 245.2 m cored; 0 m drilled; 47.3 % recovery
112-681B * Latitude: -10.976660 * Longitude: -77.957670 * Date/Time Start: 1986-11-08T00:00:00 * Date/Time End: 1986-11-08T13:15:00 * Elevation: -162.0 m * Penetration: 143.5 m * Recovery: 97.3 m * Location: South Pacific Ocean * Campaign: Leg112 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 16 cores; 143.5 m cored; 0 m drilled; 67.8 % recovery
112-688 * Latitude: -11.537733 * Longitude: -78.943100 * Date/Time Start: 1986-12-05T00:00:00 * Date/Time End: 1986-12-18T00:00:00 * Elevation: -3829.8 m * Penetration: 2193.6 m * Recovery: 398.5 m * Location: South Pacific Ocean * Campaign: Leg112 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 85 cores; 798.3 m cored; 0 m drilled; 49.9% recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets

Download Data

Download ZIP file containing all datasets as tab-delimited text — use the following character encoding:

Datasets listed in this publication series

  1. Lückge, A; Boussafir, M; Lallier-Verges, E et al. (1996): (Table 2) Organic carbon, sulphur and iron contents in sediments of the Oman and Peru continental margin. https://doi.org/10.1594/PANGAEA.757240
  2. Lückge, A; Boussafir, M; Lallier-Verges, E et al. (1996): (Table 1) Sedimentation rates, TOC values, wet bulk densities, porosity and organic carbon accumulation rates of sediments from Oman and Peru continental margins. https://doi.org/10.1594/PANGAEA.757238