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Spivack, Arthur J; McNeil, Craig; Holm, Nils G; Hinrichs, Kai-Uwe (2006): (Table T1) In situ methane concentrations of ODP Site 201-1230. PANGAEA,, Supplement to: Spivack, AJ et al. (2006): Determination of in situ methane based on analysis of void gas. In: Jørgensen, BB; D'Hondt, SL; Miller, DJ (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 201, 1-11,

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A method for quantifying in situ dissolved methane concentrations in sediment cores that have gas voids is described. The method relies on normalizing methane (CH4) in the gas voids to nitrogen (N2) and/or argon (Ar). The principles of the method are presented. The method was tested during Ocean Drilling Program Leg 201, and preliminary results indicate that it can be used to generate reproducible and accurate dissolved methane values if argon and nitrogen are both measured or if one is measured along with pressure of the gas void.
Median Latitude: -9.112450 * Median Longitude: -80.583505 * South-bound Latitude: -9.112550 * West-bound Longitude: -80.583510 * North-bound Latitude: -9.112350 * East-bound Longitude: -80.583500
Date/Time Start: 2002-03-11T00:38:00 * Date/Time End: 2002-03-18T08:35:00
Minimum DEPTH, sediment/rock: 28.3 m * Maximum DEPTH, sediment/rock: 169.7 m
201-1230A * Latitude: -9.112550 * Longitude: -80.583500 * Date/Time Start: 2002-03-11T00:38:00 * Date/Time End: 2002-03-16T22:35:00 * Elevation: -5086.2 m * Penetration: 278.3 m * Recovery: 187.33 m * Location: South Pacific Ocean * Campaign: Leg201 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 39 cores; 277.3 m cored; 1 m drilled; 67.6 % recovery
201-1230B * Latitude: -9.112350 * Longitude: -80.583510 * Date/Time Start: 2002-03-16T22:35:00 * Date/Time End: 2002-03-18T08:35:00 * Elevation: -5085.5 m * Penetration: 105 m * Recovery: 98.33 m * Location: South Pacific Ocean * Campaign: Leg201 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 14 cores; 102 m cored; 3 m drilled; 96.4 % recovery
Uncertainty is ±33% from the calculated mean. Sediment depth is given in mbsf.
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2Sample code/labelSample labelSpivack, Arthur JDSDP/ODP/IODP sample designation
3DEPTH, sediment/rockDepthmGeocode
4Nitrogen/Oxygen ratio, gasN2/O2Spivack, Arthur JCalculated
5Methane/Nitrogen ratioCH4/N2Spivack, Arthur JCalculated
6MethaneCH4µmol/kgSpivack, Arthur JCalculated
7Sample commentSample commentSpivack, Arthur JSamples which are contaminated creating an uncertainty >33% for CH4 calculation
92 data points

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