(Table 1) Low molecular weight hydrocarbon concentrations and organic carbon contents at DSDP Hole 71-511
Fuente:
PANGAEA
Guardado en:
| Autores principales: | , , |
|---|---|
| Formato: | Dataset Open Access |
| Lenguaje: | en |
| Publicado: |
PANGAEA
1983
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1867169082948714496 |
|---|---|
| author | Schaefer, Rainer G von der Dick, Hans Leythaeuser, Detlev |
| author_facet | Schaefer, Rainer G von der Dick, Hans Leythaeuser, Detlev |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | C2-C8 hydrocarbons (36 compounds identified) from 56 shipboard sealed, deep-frozen core samples of DSDP Leg 71, Site 511, Falkland Plateau, South Atlantic, were analyzed by a combined hydrogen stripping-thermovaporization method. Concentrations, which represent hydrocarbons dissolved in the pore water and adsorbed to the mineral surfaces of the sediment, vary from 24 ng/g of dry weight sediment in Lithologic Unit 4 to 17,400 ng/g in Lithologic Unit 6 ("black shale" unit). Likewise, the organic carbon normalized C2-C8 hydrocarbon concentrations range from 104 to 3.5 x 105 ng/g Corg. The latter value is more than one order of magnitude lower than expected for petroleum source beds in the main phase of oil generation. The low maturity at 600 meters depth is further supported by light hydrocarbon concentration ratios. The change of the kerogen type from Lithologic Unit 5 (Type III) to 6 (Type II) is evidenced by changes in the C6 and C7 hydrocarbon composition. Redistribution phenomena are observed close to the Tertiary-Cretaceous unconformity and at the contact between the "black shale" unit and the overlying Cretaceous chalks and claystones. Otherwise, the low molecular weight hydrocarbons in Hole 511 are formed in situ and remain at their place of formation. The core samples turned out to be contaminated by large quantities of acetone, which is routinely used as a solvent during sampling procedures onboard Glomar Challenger. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_815221 |
| institution | PANGAEA |
| language | en |
| publishDate | 1983 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Low molecular weight hydrocarbon concentrations and organic carbon contents at DSDP Hole 71-511 Schaefer, Rainer G von der Dick, Hans Leythaeuser, Detlev 1,cis-2-Dimethylcyclopentane, per unit sediment mass; 1,cis-3-Dimethylcyclopentane, per unit sediment mass; 1,trans-2,cis-3-trimethylcyclopentane, per unit sediment mass; 1,trans-2,cis-4-trimethylcyclopentane, per unit sediment mass; 1 trans-2-Dimethylcyclopentane, per unit sediment mass; 1 trans-3-Dimethylcyclopentane, per unit sediment mass; 2,2-Dimethylbutane, per unit sediment mass; 2,2-Dimethylpropane, per unit sediment mass; 2,3-Dimethylbutane, per unit sediment mass; 2,3-Dimethylpentane, per unit sediment mass; 2,4-Dimethylpentane, per unit sediment mass; 2,5-Dimethylhexane, per unit sediment mass; 2-Methylheptane, per unit sediment mass; 2-Methylhexane, per unit sediment mass; 2-Methylpentane, per unit sediment mass; 3-Methylhexane, per unit sediment mass; 3-Methylpentane, per unit sediment mass; 71-511; Benzene, per unit sediment mass; Carbon, organic, total; Cis-2-butene, per unit sediment mass; Cyclohexane, per unit sediment mass; Cyclopentane, per unit sediment mass; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Element analyser CHN, LECO; Ethane, per unit sediment mass; Ethylcyclopentane, per unit sediment mass; Glomar Challenger; Hydrogen index, mass HC, per unit mass total organic carbon; Isobutane, per unit sediment mass; Isopentane, per unit sediment mass; Leg71; Methylcyclohexane, per unit sediment mass; Methylcyclopentane, per unit sediment mass; Methylpropene, per unit sediment mass; n-Butane, per unit sediment mass; n-Heptane, per unit sediment mass; n-Hexane, per unit sediment mass; n-Octane, per unit sediment mass; n-Pentane, per unit sediment mass; Propane, per unit sediment mass; Rock eval pyrolysis (Espitalié et al. 1977); Sample code/label; see reference(s); South Atlantic/PLATEAU; Toluene, per unit sediment mass; Trans-2-butene, per unit sediment mass C2-C8 hydrocarbons (36 compounds identified) from 56 shipboard sealed, deep-frozen core samples of DSDP Leg 71, Site 511, Falkland Plateau, South Atlantic, were analyzed by a combined hydrogen stripping-thermovaporization method. Concentrations, which represent hydrocarbons dissolved in the pore water and adsorbed to the mineral surfaces of the sediment, vary from 24 ng/g of dry weight sediment in Lithologic Unit 4 to 17,400 ng/g in Lithologic Unit 6 ("black shale" unit). Likewise, the organic carbon normalized C2-C8 hydrocarbon concentrations range from 104 to 3.5 x 105 ng/g Corg. The latter value is more than one order of magnitude lower than expected for petroleum source beds in the main phase of oil generation. The low maturity at 600 meters depth is further supported by light hydrocarbon concentration ratios. The change of the kerogen type from Lithologic Unit 5 (Type III) to 6 (Type II) is evidenced by changes in the C6 and C7 hydrocarbon composition. Redistribution phenomena are observed close to the Tertiary-Cretaceous unconformity and at the contact between the "black shale" unit and the overlying Cretaceous chalks and claystones. Otherwise, the low molecular weight hydrocarbons in Hole 511 are formed in situ and remain at their place of formation. The core samples turned out to be contaminated by large quantities of acetone, which is routinely used as a solvent during sampling procedures onboard Glomar Challenger. |
| title | (Table 1) Low molecular weight hydrocarbon concentrations and organic carbon contents at DSDP Hole 71-511 |
| topic | 1,cis-2-Dimethylcyclopentane, per unit sediment mass; 1,cis-3-Dimethylcyclopentane, per unit sediment mass; 1,trans-2,cis-3-trimethylcyclopentane, per unit sediment mass; 1,trans-2,cis-4-trimethylcyclopentane, per unit sediment mass; 1 trans-2-Dimethylcyclopentane, per unit sediment mass; 1 trans-3-Dimethylcyclopentane, per unit sediment mass; 2,2-Dimethylbutane, per unit sediment mass; 2,2-Dimethylpropane, per unit sediment mass; 2,3-Dimethylbutane, per unit sediment mass; 2,3-Dimethylpentane, per unit sediment mass; 2,4-Dimethylpentane, per unit sediment mass; 2,5-Dimethylhexane, per unit sediment mass; 2-Methylheptane, per unit sediment mass; 2-Methylhexane, per unit sediment mass; 2-Methylpentane, per unit sediment mass; 3-Methylhexane, per unit sediment mass; 3-Methylpentane, per unit sediment mass; 71-511; Benzene, per unit sediment mass; Carbon, organic, total; Cis-2-butene, per unit sediment mass; Cyclohexane, per unit sediment mass; Cyclopentane, per unit sediment mass; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Element analyser CHN, LECO; Ethane, per unit sediment mass; Ethylcyclopentane, per unit sediment mass; Glomar Challenger; Hydrogen index, mass HC, per unit mass total organic carbon; Isobutane, per unit sediment mass; Isopentane, per unit sediment mass; Leg71; Methylcyclohexane, per unit sediment mass; Methylcyclopentane, per unit sediment mass; Methylpropene, per unit sediment mass; n-Butane, per unit sediment mass; n-Heptane, per unit sediment mass; n-Hexane, per unit sediment mass; n-Octane, per unit sediment mass; n-Pentane, per unit sediment mass; Propane, per unit sediment mass; Rock eval pyrolysis (Espitalié et al. 1977); Sample code/label; see reference(s); South Atlantic/PLATEAU; Toluene, per unit sediment mass; Trans-2-butene, per unit sediment mass |
| url | https://doi.org/10.1594/PANGAEA.815221 |