Molecular and stable isotope composition of headspace and total hydrogencarbon gases of ODP Leg 104 sites ...

• Main Authors: Whiticar, Michael J, Faber, Eckhard
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1989
• Subjects: Drilling/drill rig; Leg104; Joides Resolution; Ocean Drilling Program ODP; Norwegian Sea
• Online Access: https://dx.doi.org/10.1594/pangaea.736728; https://doi.pangaea.de/10.1594/PANGAEA.736728

Molecular and isotope compositions of headspace and total (free + sorbed) hydrocarbon gases from drilled cores of the three ODP Leg 104 Sites 642, 643, and 644 of the Voring Plateau are used to characterize the origin and distribution of these gases in Holocene to Eocene sediments. Only minor amounts of methane were found in the headspace (0.1 to < 0.001 vol%). Although methane through propane are present in all of the total gas samples, different origins account for the concentration and composition variations found.Site 643 at the foot of the outer Voring Plateau represents a geological setting with poor hydrocarbon generating potential, (sediments with low TOC and maturity overlying oceanic basement). Correspondingly, the total gas concentrations are low, typical for background gases (yield C1 - 4 = 31 to 232 ppb, C1/C2+ = 0.6 to 4; delta13C(CH4) -22 per mil to -42 per mil) probably of a diagenetic origin.Holocene to Eocene sediments, which overlie volcanic units, were drilled on the outer Vdring ... : Supplement to: Whiticar, Michael J; Faber, Eckhard (1989): Molecular and stable isotope composition of headspace and total hydrocarbon gases at ODP Leg 104, Sites 642, 643, and 644, Vøring Plateau, Norwegian Sea. In: Eldholm, O; Thiede, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 104, 327-334 ...