Citation:

dsdp.proc.79.131.1984

Name: (Table 1) Summary of low-molecular-weight hydrocarbon concentrations, organic carbon contents, Rock-Eval pyrolysis and lithology at DSDP Leg 79 Holes
Published: 1984
License: https://creativecommons.org/licenses/by/3.0/

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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):

Deep Sea Drilling Project (DSDP)

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: * Basis: Glomar Challenger * Method/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: * Basis: Glomar Challenger * Method/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: * Basis: Glomar Challenger * Method/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):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event
2	Latitude of event	Latitude
3	Longitude of event	Longitude
4	Elevation of event	Elevation	m
5	Sample code/label	Sample label		Schaefer, Rainer G	DSDP/ODP/IODP sample designation
6	DEPTH, sediment/rock	Depth sed	m			Geocode
7	Lithology/composition/facies	Lithology		Schaefer, Rainer G
8	Carbon, organic, total	TOC	%	Schaefer, Rainer G	Element analyser CHN, LECO
9	Hydrogen index, mass HC, per unit mass total organic carbon	HI, HC/TOC	mg/g	Schaefer, Rainer G	Rock eval pyrolysis (Espitalié et al. 1977)
10	Oxygen index, mass CO2, per unit mass total organic carbon	OI, CO2/TOC	mg/g	Schaefer, Rainer G	Rock eval pyrolysis (Espitalié et al. 1977)
11	Pyrolysis temperature maximum	Tmax	°C	Schaefer, Rainer G	Rock eval pyrolysis (Espitalié et al. 1977)	#1
12	Pyrolysis temperature maximum	Tmax	°C	Schaefer, Rainer G	Rock eval pyrolysis (Espitalié et al. 1977)	#2
13	Pyrolysis temperature maximum	Tmax	°C	Schaefer, Rainer G	Rock eval pyrolysis (Espitalié et al. 1977)	#3
14	Ethene per unit sediment mass	C2H4/sed	ng/g	Schaefer, Rainer G	see reference(s)
15	Ethane per unit sediment mass	C2H6/sed	ng/g	Schaefer, Rainer G	see reference(s)
16	Propene per unit sediment mass	C3H6/sed	ng/g	Schaefer, Rainer G	see reference(s)
17	Propane per unit sediment mass	C3H8/sed	ng/g	Schaefer, Rainer G	see reference(s)
18	Isobutane per unit sediment mass	i-C4H10/sed	ng/g	Schaefer, Rainer G	see reference(s)
19	Isobutane per unit sediment mass	i-C4H10/sed	ng/g	Schaefer, Rainer G	see reference(s)	+ 1-butene
20	n-Butane per unit sediment mass	n-C4H10/sed	ng/g	Schaefer, Rainer G	see reference(s)
21	Trans-2-butene per unit sediment mass	trans-C4H8/sed	ng/g	Schaefer, Rainer G	see reference(s)
22	2,2-Dimethylpropane per unit sediment mass	2,2 DMP/sed	ng/g	Schaefer, Rainer G	see reference(s)
23	Cis-2-butene per unit sediment mass	cis-C4H8/sed	ng/g	Schaefer, Rainer G	see reference(s)
24	Isopentane per unit sediment mass	i-C5H12/sed	ng/g	Schaefer, Rainer G	see reference(s)
25	n-Pentane per unit sediment mass	n-C5H12/sed	ng/g	Schaefer, Rainer G	see reference(s)
26	2,2-Dimethylbutane per unit sediment mass	2,2 DMB/sed	ng/g	Schaefer, Rainer G	see reference(s)
27	Cyclopentane per unit sediment mass	C5H10/sed	ng/g	Schaefer, Rainer G	see reference(s)
28	2,3-Dimethylbutane per unit sediment mass	2,3 DMB/sed	ng/g	Schaefer, Rainer G	see reference(s)
29	2-Methylpentane per unit sediment mass	i-C6H14/sed	ng/g	Schaefer, Rainer G	see reference(s)
30	3-Methylpentane per unit sediment mass	3-Methylpentane/sed	ng/g	Schaefer, Rainer G	see reference(s)
31	n-Hexane per unit sediment mass	n-C6H14/sed	ng/g	Schaefer, Rainer G	see reference(s)
32	Methylcyclopentane per unit sediment mass	MCP/sed	ng/g	Schaefer, Rainer G	see reference(s)	+ 2,2-dimethylpentane
33	2,4-Dimethylpentane per unit sediment mass	2,4 DMP/sed	ng/g	Schaefer, Rainer G	see reference(s)
34	Benzene per unit sediment mass	C6H6/sed	ng/g	Schaefer, Rainer G	see reference(s)
35	Cyclohexane per unit sediment mass	C6H14/sed	ng/g	Schaefer, Rainer G	see reference(s)
36	2-Methylhexane per unit sediment mass	i-C7H16/sed	ng/g	Schaefer, Rainer G	see reference(s)
37	2,3-Dimethylpentane per unit sediment mass	2,3 DMP/sed	ng/g	Schaefer, Rainer G	see reference(s)	+ 1,1-dimethylcyclopentane
38	3-Methylhexane per unit sediment mass	3-Methylhexane/sed	ng/g	Schaefer, Rainer G	see reference(s)
39	1,cis-3-Dimethylcyclopentane per unit sediment mass	1, cis-3 DMCP/sed	ng/g	Schaefer, Rainer G	see reference(s)
40	1 trans-3-Dimethylcyclopentane per unit sediment mass	1 trans-3 DMCP/sed	ng/g	Schaefer, Rainer G	see reference(s)
41	1 trans-2-Dimethylcyclopentane per unit sediment mass	1 trans-2 DMCP/sed	ng/g	Schaefer, Rainer G	see reference(s)
42	n-Heptane per unit sediment mass	n-C7/sed	ng/g	Schaefer, Rainer G	see reference(s)
43	1,cis-2-Dimethylcyclopentane per unit sediment mass	1, cis-2 DMCP/sed	ng/g	Schaefer, Rainer G	see reference(s)
44	Methylcyclohexane per unit sediment mass	C7H14/sed	ng/g	Schaefer, Rainer G	see reference(s)
45	2,5-Dimethylhexane per unit sediment mass	C8H18/sed	ng/g	Schaefer, Rainer G	see reference(s)
46	Ethylcyclopentane per unit sediment mass	C7H14/sed	ng/g	Schaefer, Rainer G	see reference(s)
47	1,trans-2,cis-4-trimethylcyclopentane per unit sediment mass	C8H16/sed	ng/g	Schaefer, Rainer G	see reference(s)
48	1,trans-2,cis-3-trimethylcyclopentane per unit sediment mass	C8H16/sed	ng/g	Schaefer, Rainer G	see reference(s)
49	Toluene per unit sediment mass	C6H5CH3/sed	ng/g	Schaefer, Rainer G	see reference(s)
50	2-Methylheptane per unit sediment mass	C8H18/sed	ng/g	Schaefer, Rainer G	see reference(s)
51	n-Octane per unit sediment mass	n-C8/sed	ng/g	Schaefer, Rainer G	see reference(s)

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

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2376 data points

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