Organic chemistry of Neogene sediments from ODP Leg 113

DOI

Stable carbon and nitrogen isotopic compositions as well as organic carbon and total nitrogen contents of cored material are reported for the Weddell Sea, Ocean Drilling Program (ODP) Sites 689 and 690 (Maud Rise), Site 693 (continental margin), and Site 694 (abyssal plain). Results from both high resolution sampling (up to six samples per section) and low resolution (one sample per section) are documented. In general, these results indicate large changes in the types and amounts of carbon and nitrogen preserved in the sediments of the Weddell Sea region during the past 25 m.y., with an especially important and dramatic event coinciding with the western Antarctic ice-sheet becoming a semi-permanent or permanent feature about 5 Ma.The overall results may be correlated with the onset of major ice-sheets on West Antarctica, stabilization of the icesheet in the Pliocene and the intensified recycling of organic carbon and total nitrogen, which is possibly the result of increased ice cover. Evidence is also presented for either low production of organic carbon or the presence of a water column, in the eastern Weddell Sea during the early and middle Neogene, which was highly corrosive to organic matter. This condition, together with slow sediment accumulation rates, inhibited the preservation of carbon in the sediments.

Supplement to: Macko, Stephen A; Pereira, Christopher PG (1990): Neogene paleoclimate development of the Antarctic Weddell Sea region: organic geochemistry. In: Barker, PF; Kennett, JP; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 113, 881-897

Identifier
DOI https://doi.org/10.1594/PANGAEA.726518
Related Identifier https://doi.org/10.2973/odp.proc.sr.113.190.1990
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.726518
Provenance
Creator Macko, Stephen A; Pereira, Christopher PG
Publisher PANGAEA
Publication Year 1990
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Language English
Resource Type Supplementary Publication Series of Datasets; Collection
Format application/zip
Size 10 datasets
Discipline Earth System Research
Spatial Coverage (-33.447W, -70.832S, 3.100E, -64.517N); South Atlantic Ocean; Weddell Sea
Temporal Coverage Begin 1987-01-16T08:00:00Z
Temporal Coverage End 1987-02-18T07:45:00Z