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Schaefer, Rainer G; Leythaeuser, Detlev; Gormly, James (1984): (Table 1) Summary of low-molecular-weight hydrocarbon concentrations, organic carbon contents, Rock-Eval pyrolysis and lithology at DSDP Leg 79 Holes. PANGAEA, https://doi.org/10.1594/PANGAEA.808659, Supplement to: Schaefer, RG et al. (1984): Generation and migration of low-molecular-weight hydrocarbons in sediments of Deep Sea Drilling Project Leg 79, Sites 544, 545, and 547, offshore Morocco. In: Hinz, K; Winterer, EL; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 79, 743-773, https://doi.org/10.2973/dsdp.proc.79.131.1984

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Abstract:
A series of core samples taken during Cruise 79 of Glomar Challenger, drilling offshore Morocco (Mazagan Plateau), is analyzed for their low-molecular-weight hydrocarbon contents. Fifty-four samples from DSDP Holes 544A, 545, 547A, and 547B, deep frozen on board immediately after recovery, are studied by a hydrogen-stripping/thermovaporization technique combined with capillary gas chromatography. Thirty-eight compounds in the C2-C8 molecular range, including saturated, olefinic, and aromatic hydrocarbons, are identified.
Because of large differences in organic carbon contents, the total C2-C8 hydrocarbon concentrations vary from about 20 to 1500 ng/g dry sediment weight in the whole sample series. Organic-carbon normalized values are about 3.2 x 10**4 ng/g Corg for Lithologic Subunits IIIA and IIIB at Site 545 (Cenomanian to Aptian) and 1.0 x 10**5 ng/g Corg for Unit V at Site 547 (Cenomanian to Albian) reflecting the slightly more advanced maturity stage at the latter site. Values exceeding 10**5 ng/g Corg (Site 545) and 2 x 10**5 ng/g Corg (Site 547) are associated with samples that are very lean in organic carbon and are generally rich in carbonate. These samples are enriched by small amounts of gaseous hydrocarbons.
A detailed study of individual hydrocarbon concentrations, plotted against depth, reveal additional indications for migration phenomena. At Site 547, for instance, the most mobile hydrocarbons studied (e.g., ethane) appear to migrate by diffusion or a related process from more than 700 m depth toward the surface.
Project(s):
Coverage:
Median Latitude: 33.748100 * Median Longitude: -9.367275 * South-bound Latitude: 33.664300 * West-bound Longitude: -9.405000 * North-bound Latitude: 33.780700 * East-bound Longitude: -9.349700
Date/Time Start: 1981-04-17T00:00:00 * Date/Time End: 1981-05-03T00:00:00
Minimum DEPTH, sediment/rock: 57.5 m * Maximum DEPTH, sediment/rock: 776.8 m
Event(s):
79-544A * Latitude: 33.766700 * Longitude: -9.405000 * Date/Time: 1981-04-17T00:00:00 * Elevation: -3581.0 m * Penetration: 235 m * Recovery: 83.3 m * Location: North Atlantic/PLATEAU * Campaign: Leg79 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 28 cores; 235 m cored; 0 m drilled; 35.5 % recovery
79-545 * Latitude: 33.664300 * Longitude: -9.364700 * Date/Time: 1981-04-23T00:00:00 * Elevation: -3142.0 m * Penetration: 701 m * Recovery: 352.1 m * Location: North Atlantic/PLATEAU * Campaign: Leg79 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 75 cores; 701 m cored; 0 m drilled; 50.2 % recovery
79-547A * Latitude: 33.780700 * Longitude: -9.349700 * Date/Time: 1981-05-03T00:00:00 * Elevation: -3938.0 m * Penetration: 744.5 m * Recovery: 329.2 m * Location: North Atlantic/PLATEAU * Campaign: Leg79 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 72 cores; 665 m cored; 0 m drilled; 49.5 % recovery
Comment:
Sediment depth is given in mbsf. #0 = concentration below or near detection limit (light hydrocarbons), <1 = value insignificant (pyrolysis).
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
2Latitude of eventLatitude
3Longitude of eventLongitude
4Elevation of eventElevationm
5Sample code/labelSample labelSchaefer, Rainer GODP sample designation
6DEPTH, sediment/rockDepthmGeocode
7Lithology/composition/faciesLithologySchaefer, Rainer G
8Carbon, organic, totalTOC%Schaefer, Rainer GElement analyser CHN, LECO
9Hydrogen index, mass HC per unit mass total organic carbonHI, HC/TOCmg/gSchaefer, Rainer GRock eval pyrolysis (Espitalié et al. 1977)
10Oxygen index, mass CO2 per unit mass total organic carbonOI, CO2/TOCmg/gSchaefer, Rainer GRock eval pyrolysis (Espitalié et al. 1977)
11Pyrolysis temperature maximumTmax°CSchaefer, Rainer GRock eval pyrolysis (Espitalié et al. 1977)#1
12Pyrolysis temperature maximumTmax°CSchaefer, Rainer GRock eval pyrolysis (Espitalié et al. 1977)#2
13Pyrolysis temperature maximumTmax°CSchaefer, Rainer GRock eval pyrolysis (Espitalié et al. 1977)#3
14Ethene per unit sediment massC2H4/sedng/gSchaefer, Rainer Gsee reference(s)
15Ethane per unit sediment massC2H6/sedng/gSchaefer, Rainer Gsee reference(s)
16Propene per unit sediment massC3H6/sedng/gSchaefer, Rainer Gsee reference(s)
17Propane per unit sediment massC3H8/sedng/gSchaefer, Rainer Gsee reference(s)
18Isobutane per unit sediment massi-C4H10/sedng/gSchaefer, Rainer Gsee reference(s)
19Isobutane per unit sediment massi-C4H10/sedng/gSchaefer, Rainer Gsee reference(s)+ 1-butene
20n-Butane per unit sediment massn-C4H10/sedng/gSchaefer, Rainer Gsee reference(s)
21Trans-2-butene per unit sediment masstrans-C4H8/sedng/gSchaefer, Rainer Gsee reference(s)
222,2-Dimethylpropane per unit sediment mass2,2 DMP/sedng/gSchaefer, Rainer Gsee reference(s)
23Cis-2-butene per unit sediment masscis-C4H8/sedng/gSchaefer, Rainer Gsee reference(s)
24Isopentane per unit sediment massi-C5H12/sedng/gSchaefer, Rainer Gsee reference(s)
25n-Pentane per unit sediment massn-C5H12/sedng/gSchaefer, Rainer Gsee reference(s)
262,2-Dimethylbutane per unit sediment mass2,2 DMB/sedng/gSchaefer, Rainer Gsee reference(s)
27Cyclopentane per unit sediment massC5H10/sedng/gSchaefer, Rainer Gsee reference(s)
282,3-Dimethylbutane per unit sediment mass2,3 DMB/sedng/gSchaefer, Rainer Gsee reference(s)
292-Methylpentane per unit sediment massi-C6H14/sedng/gSchaefer, Rainer Gsee reference(s)
303-Methylpentane per unit sediment mass3-Methylpentane/sedng/gSchaefer, Rainer Gsee reference(s)
31n-Hexane per unit sediment massn-C6H14/sedng/gSchaefer, Rainer Gsee reference(s)
32Methylcyclopentane per unit sediment massMCP/sedng/gSchaefer, Rainer Gsee reference(s)+ 2,2-dimethylpentane
332,4-Dimethylpentane per unit sediment mass2,4 DMP/sedng/gSchaefer, Rainer Gsee reference(s)
34Benzene per unit sediment massC6H6/sedng/gSchaefer, Rainer Gsee reference(s)
35Cyclohexane per unit sediment massC6H14/sedng/gSchaefer, Rainer Gsee reference(s)
362-Methylhexane per unit sediment massi-C7H16/sedng/gSchaefer, Rainer Gsee reference(s)
372,3-Dimethylpentane per unit sediment mass2,3 DMP/sedng/gSchaefer, Rainer Gsee reference(s)+ 1,1-dimethylcyclopentane
383-Methylhexane per unit sediment mass3-Methylhexane/sedng/gSchaefer, Rainer Gsee reference(s)
391,cis-3-Dimethylcyclopentane per unit sediment mass1, cis-3 DMCP/sedng/gSchaefer, Rainer Gsee reference(s)
401 trans-3-Dimethylcyclopentane per unit sediment mass1 trans-3 DMCP/sedng/gSchaefer, Rainer Gsee reference(s)
411 trans-2-Dimethylcyclopentane per unit sediment mass1 trans-2 DMCP/sedng/gSchaefer, Rainer Gsee reference(s)
42n-Heptane per unit sediment massn-C7/sedng/gSchaefer, Rainer Gsee reference(s)
431,cis-2-Dimethylcyclopentane per unit sediment mass1, cis-2 DMCP/sedng/gSchaefer, Rainer Gsee reference(s)
44Methylcyclohexane per unit sediment massC7H14/sedng/gSchaefer, Rainer Gsee reference(s)
452,5-Dimethylhexane per unit sediment massC8H18/sedng/gSchaefer, Rainer Gsee reference(s)
46Ethylcyclopentane per unit sediment massC7H14/sedng/gSchaefer, Rainer Gsee reference(s)
471,trans-2,cis-4-trimethylcyclopentane per unit sediment massC8H16/sedng/gSchaefer, Rainer Gsee reference(s)
481,trans-2,cis-3-trimethylcyclopentane per unit sediment massC8H16/sedng/gSchaefer, Rainer Gsee reference(s)
49Toluene per unit sediment massC6H5CH3/sedng/gSchaefer, Rainer Gsee reference(s)
502-Methylheptane per unit sediment massC8H18/sedng/gSchaefer, Rainer Gsee reference(s)
51n-Octane per unit sediment massn-C8/sedng/gSchaefer, Rainer Gsee reference(s)
Size:
2376 data points

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