Publication Date:
2023-06-27
Description:
C2-C8 hydrocarbon concentrations (about 35 compounds identified, including saturated, aromatic, and olefinic compounds) from 27 shipboard-sealed, deep-frozen core samples of DSDP Hole 603B off the east coast of North America were determined by a gas-stripping/thermovaporization method. Total yields representing the hydrocarbons dissolved in the pore water and adsorbed on the mineral surfaces of the sediments vary from 22 to 2400 ng/g of dryweight sediment. Highest yields are measured in the two black shale samples of Core 603B-34 (hydrogen index of 360 and 320 mg/g Corg, respectively). In organic-carbon-normalized units these samples have hydrocarbon contents of 12,700 and 21,500 ng/g Corg, respectively, indicating the immaturity of their kerogens. Unusually high organic-carbonnormalized yields are associated with samples that are extremely lean in organic carbon. It is most likely that they are enriched by small amounts of migrated light hydrocarbons. This applies even to those samples with high organic-carbon contents (1.3-2.2%) of Sections 603B-28-4, 603B-29-1, 603B-49-2, and 603B-49-3, because they have an extremely low hydrocarbon potential (hydrogen index between 40 and 60 mg/g Corg). Nearly all samples were found to be contaminated by varying amounts of acetone that is used routinely in large quantities on board ship during core-cutting procedures. Therefore, 48 samples from the original set of 75 collected had to be excluded from the present study.
Keywords:
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; 2,3-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-Methylhexane per unit sediment mass; 2-Methylpentane per unit sediment mass; 3-Methylhexane per unit sediment mass; 3-Methylpentane per unit sediment mass; 93-603B; Benzene per unit sediment mass; Carbon, organic, total; Carbon analyser, LECO; Combined gas-stripping/thermovaporization method; 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; Ethane per unit sediment mass; Ethene 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; Leg93; Lithology/composition/facies; Methylcyclohexane per unit sediment mass; Methylcyclopentane 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; Oxygen index, mass CO2, per unit mass total organic carbon; Propane per unit sediment mass; Propene per unit sediment mass; Pyrolysis temperature maximum; Rock eval pyrolysis (Behar et al., 2001); Sample code/label; Toluene per unit sediment mass; Visual description
Type:
Dataset
Format:
text/tab-separated-values, 1026 data points
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