Porphyrin geochemistry of DSDP Hole 71-511
| Cobertura |
LATITUDE: -51.004700 * LONGITUDE: -46.971700 * DATE/TIME START: 1980-01-15T00:00:00 * DATE/TIME END: 1980-01-15T00:00:00 |
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| Data(s) |
20/07/1985
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| Resumo |
Late Jurassic-early Cretaceous black shales and an overlying sequence of Albian-Campanian zeolitic claystones from the Falkland Plateau (DSDP/IPOD Leg 71, Site 511) were analyzed for tetrapyrrole pigment type and abundance. The "black shale" sequence was found to be rich in DPEP-series dominated free-base, nickel (Ni) and, to a lesser extent, vanadyl (V = 0) porphyrins. A low level of organic maturity (i.e. precatagenesis) is indicated for these strata as nickel chelation by free-base porphyrins is only 50-75% complete, proceeding down-hole to 627 meters sub-bottom. Electronic and mass spectral data reveal that the proposed benzo-DPEP (BD) and tetrahydrobenzo-DPEP (THBD) series are present in the free-base and Ni species, as well as the more usual occurrence in V = 0 porphyrin arrays. Highly reducing conditions are suggested by an abundance of the PAH perylene, substantial amounts of the THBD/BD series and a redox equilibrium between free-base DPEP and 7,8-dihydro-DPEP series, which exist in a 7:1 molar ratio. The Albian-Campanian claystone strata were found to be tetrapyrrolepoor, and those pigments present were typed as Cu/Ni highly dealkylated (C26 max.) etioporphyrins, thought to be derived via redeposition and oxidation of terrestrial organic matter (OM). Results from the present study are correlated to our past analyses of Jurassic-Cretaceous sediments from Atlantic margins in an effort to relate tetrapyrrole quality and quantity to basin evolution and OM sources in the proto-Atlantic. |
| Formato |
application/zip, 4 datasets |
| Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.763295 doi:10.1594/PANGAEA.763295 |
| Idioma(s) |
en |
| Publicador |
PANGAEA |
| Relação |
Deroo, Gerard; Herbin, Jean-Paul; Roucaché, J (1983): Organic geochemistry of upper Jurassic-Cretaceous sediments from Site 511, Leg 71, western South Atlantic. In: Ludwig, WJ; Krasheninnikov, VA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 71, 1001-1013, doi:10.2973/dsdp.proc.71.137.1983 Ludwig, Wolfgang; Krasheninnikov, Valery A; Wise, Sherwood W (1983): Initial Reports of the Deep Sea Drilling Project. U. S. Government Printing Office, 71, 999 pp + 477 pp, doi:10.2973/dsdp.proc.71.1983 von der Dick, Hans; Rullkötter, Jürgen; Welte, Dietrich Hugo (1983): Content, type, and thermal evolution of organic matter in sediments from the eastern Falkland Plateau, Deep Sea Drilling Project, Leg 71. In: Ludwig, WF; Krasheninnikov, VA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Government Print Office), 71, 1015-1032, doi:10.2973/dsdp.proc.71.138.1983 |
| Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
| Fonte |
Supplement to: Baker, Earl W; Louda, William (1985): Porphyrin geochemistry of Atlantic Jurassic-Cretaceous black shales. Organic Geochemistry, 10(4-6), 905-914, doi:10.1016/S0146-6380(86)80028-6 |
| Palavras-Chave | #-; 7,8diH DPEP = 7,8-dihydro-DPEP series, calculated using Sum mM = 43.0 at 640 nm (DOMPPa; Zelmer and Man, 1983, doi:10.1016/0146-6380(83)90015-3); 71-511; after Deroo et al. (1983), von der Dick et al. (1983) as determined on the same core-section but not these specific sample; Av C n; Average carbon number; C24 carbon number; C24 C n; C25 carbon number; C25 C n; C26 carbon number; C26 C n; C27 carbon number; C27 C n; C28 carbon number; C28 C n; C29 carbon number; C29 C n; C30 carbon number; C30 C n; C31 carbon number; C31 C n; C32 carbon number; C32 C n; C33 carbon number; C33 C n; C34 carbon number; C34 C n; Calculated; calculated from a bottom water temperature of 0.7° and a linear thermal gradient of 74°C/km (Langseth and Ludwig, 1983, doi:10.2973/dsdp.proc.71.109.1983); calculated using Sum mM = 26.14 at 571 nm (Fuhrhop and Smith, 1975).; calculated using Sum mM = 34.82 at 550 nm (Fuhrhop and Smith, 1975).; Carbon, organic, total; Chlorins; Cu/Ni, HDEs = highly dealkylated etioporphyrins, calculated using Sum mM = 30.0 at 560 nm (Baker and Louda, 1984, doi:10.1016/0146-6380(84)90040-8); Deep Sea Drilling Project; Depth; DEPTH, sediment/rock; DPEP = 476 +/- 14n; THBD = tetrahydrobenzo-DPEP (Barwise and Roberts, 1984, doi:10.1016/0146-6380(84)90038-X) = 474 +/- 14n; BD = benzo-DPEP (Baker et al., 1967, doi:10.1021/ja00990a050; Barwise and Whitehead, 1980) = 470 + l4n; (n is an integer); DPEP to ETIO ratio calculated excluding BD and TH series; DRILL; Drilling/drill rig; DSDP; Epoch; Etioporphyrins; F.B. DPEP = free-base porphyrins (DPEP-series), calculated using Sum mM = 7.3 at 619 nm (Baker et al., 1968, doi:10.1021/jo01272a026); from Ludwig et al. (1983); Glomar Challenger; Label; Leg71; mbsf; Molar ratio of free-base DPEP-series to the 7,8-dihydro-DPEP-series; Nickel-Porphyrins; Ni-Porphyrins; ODP sample designation; Perc; Percentage; percent each series is of the intire free-base array, based on MS intensities; percent each series is within a metallo-species; Perylene; Ratio; Samp com; Sample code/label; Sample comment; South Atlantic/PLATEAU; t; Temperature, in rock/sediment; Tetrapyrroles; TOC; Vanadyl porphyrins; Van porhyrins; VO = vanadyl; D = DPEP; E = ETIO; BD = benzo-DPEP; TH = tetrahydrobenzo-DPEP; DPEP = 476 +/- 14n; THBD = tetrahydrobenzo-DPEP (Barwise and Roberts, 1984, doi:10.1016/0146-6380(84)90038-X) = 474 +/- 14n; BD = benzo-DPEP (Baker et al., 1967, doi:10.1021/ja00990a050; Barwise and Whitehead, 1980) = 470 + l4n; (n is an integer) |
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