Geochemistry of sediments and kerogenes of ODP Hole
Cobertura |
LATITUDE: 25.419700 * LONGITUDE: -77.333000 * DATE/TIME START: 1985-03-09T17:03:00 * DATE/TIME END: 1985-03-11T19:00:00 |
---|---|
Data(s) |
22/07/1988
|
Resumo |
The organic matter contained within a series of Albian to Cenomanian, dark gray to black marls was characterized using pyrolysis techniques and analysis (elemental and carbon isotopes) of isolated kerogens. It was concluded that this material had a marine affinity. Variations in geochemical characteristics reflect differences in the extent of preservation, rather than changes in organic provenance. These changes appear to reflect differences in water depth and the position of the depositional site relative to the oxygen-minimum zone. Sediments displaying the most elevated levels of organiccarbon and hydrogen enrichment probably reflect sedimentation within the oxygen-minimum zone. Waters within the oxygen-minimum zone were probably dysaerobic, rather than anoxic. The presence of at least trace quantities of oxygen at the depositional site explains the poor degree of organic preservation and the material's largely gas-prone characteristics. |
Formato |
application/zip, 2 datasets |
Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.743274 doi:10.1594/PANGAEA.743274 |
Idioma(s) |
en |
Publicador |
PANGAEA |
Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
Fonte |
Supplement to: Katz, Barry J (1988): Organic-geochemical character and hydrocarbon-source potential of Site 635. In: Austin, JA Jr.; Schlager, W; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 101, 381-388, doi:10.2973/odp.proc.sr.101.159.1988 |
Palavras-Chave | #<2 µm, >9 phi; 101-635B; Ash, volcanic; C; Carbon; Carbon, organic, total; d13C; delta 13C; Depth; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Element analyser CS, LECO; H; H/C; HI, HC/TOC; Hydrocarbon yield, S1 per unit sediment mass; Hydrocarbon yield, S2 per unit sediment mass; Hydrogen; Hydrogen/Carbon ratio; Hydrogen index, mass HC per unit mass total organic carbon; Joides Resolution; Label; Leg101; Nitrogen, total; North Atlantic Ocean; O/C; O2; Ocean Drilling Program; ODP; ODP sample designation; OI, CO2/TOC; Oxygen, gas; Oxygen/Carbon ratio; Oxygen index, mass CO2 per unit mass total organic carbon; per mil PDB; Pyrolysis temperature maximum; S; S1/sed; S2/sed; Sample code/label; Size fraction < 0.002 mm, > 9 phi, clay; Sulphur, total; Tmax; TN; TOC; total clays; Volc ash; X-ray diffraction (XRD) |
Tipo |
Dataset |