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Summerhayes, Colin P; Masran, Theodora C (1984): (Appendix) Total organic carbon, pyrolysis characteristics, and organic matter types at DSDP Holes 77-535 and 77-540. PANGAEA,, Supplement to: Summerhayes, CP; Masran, TC (1984): Organic facies of Cretaceous sediments from Deep Sea Drilling Project Sites 535 and 540, eastern Gulf of Mexico. In: Buffler, RT; Schlager, W; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 77, 451-457,

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Lower to middle Cretaceous sediments in the eastern Gulf of Mexico are richer in organic matter and have a more marine organic facies than their counterparts in the nearby western North Atlantic, suggesting that the Gulf was the more productive of the two areas. As in the western North Atlantic, the rate of supply of terrestrial organic matter was high when the rate of supply of noncarbonate clastic materials was high (at times of low sea level) and diminished as sea level rose. The rate of supply of marine organic matter was lower in the Early Cretaceous than in the Cenomanian, perhaps in response to the global rise in sea level over this period. Where they are thermally mature, the organic matterrich units drilled at Sites 535 and 540 should be excellent sources for liquid hydrocarbons. The Pleistocene sediments of the eastern Gulf are dominated by terrestrial organic matter representing Mississippi River effluent.
Median Latitude: 23.768400 * Median Longitude: -84.443500 * South-bound Latitude: 23.708000 * West-bound Longitude: -84.516200 * North-bound Latitude: 23.828800 * East-bound Longitude: -84.370800
Date/Time Start: 1980-12-29T00:00:00 * Date/Time End: 1981-01-19T00:00:00
Minimum DEPTH, sediment/rock: 2.7 m * Maximum DEPTH, sediment/rock: 730.7 m
77-535 * Latitude: 23.708000 * Longitude: -84.516200 * Date/Time: 1980-12-29T00:00:00 * Elevation: -3450.0 m * Penetration: 714 m * Recovery: 504.6 m * Location: Gulf of Mexico/BASIN * Campaign: Leg77 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 78 cores; 704.5 m cored; 9.5 m drilled; 71.6 % recovery
77-540 * Latitude: 23.828800 * Longitude: -84.370800 * Date/Time: 1981-01-19T00:00:00 * Elevation: -2926.0 m * Penetration: 745.5 m * Recovery: 335.1 m * Location: Gulf of Mexico * Campaign: Leg77 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 79 cores; 745.5 m cored; 0 m drilled; 44.9 % recovery
Sediment depth is given in mbsf. Organic matter types by Th. C. Masran (in percent of kerogen fraction) using organic matter classification scheme of Masran and Pocock (1981).
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
2Sample code/labelSample labelSummerhayes, Colin PODP sample designation
3Lithologic unit/sequenceUnitSummerhayes, Colin P
4DEPTH, sediment/rockDepthmGeocode
5EpochEpochSummerhayes, Colin P
6Lithology/composition/faciesLithologySummerhayes, Colin P
7Carbon, organic, totalTOC%Summerhayes, Colin PElement analyser CHN, LECO
8Organic matter, terrigenousOM terr%Summerhayes, Colin PLight microscopeStructured
9Pollen and sporesPollen+spores%Summerhayes, Colin PLight microscope
10CharcoalCharcoal%Summerhayes, Colin PLight microscope
11Organic matter, terrigenousOM terr%Summerhayes, Colin PLight microscopeBiodegraded
12Organic matter, amorphousAOM%Summerhayes, Colin PLight microscope# = marine structural remnants
13Organic matter, amorphousAOM%Summerhayes, Colin PLight microscopeGray
14Organic matter, aquaticOM aquatic%Summerhayes, Colin PLight microscopeStructured marine
15Organic matter, amorphousAOM%Summerhayes, Colin PLight microscopeRound bodies (probably algal)
16Hydrogen index, mass HC per unit mass total organic carbonHI, HC/TOCmg/gSummerhayes, Colin PRock eval pyrolysis (Espitalié et al. 1977)
17Oxygen index, mass CO2 per unit mass total organic carbonOI, CO2/TOCmg/gSummerhayes, Colin PRock eval pyrolysis (Espitalié et al. 1977)High oxygen indices probably result from some decomposition of carbonate minerals and/or extensive oxidation of organic matter
465 data points

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