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  • PANGAEA  (20)
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  • 1
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    PANGAEA
    In:  Supplement to: Hartwig, Alexander; di Primio, Rolando; Anka, Zahie; Horsfield, Brian (2012): Source rock characteristics and compositional kinetic models of Cretaceous organic rich black shales offshore southwestern Africa. Organic Geochemistry, 51, 17-34, https://doi.org/10.1016/j.orggeochem.2012.07.008
    Publication Date: 2023-05-12
    Description: The source rock potential of Cretaceous organic rich whole rock samples from deep sea drilling project (DSDP) wells offshore southwestern Africa was investigated using bulk and quantitative pyrolysis techniques. The sample material was taken from organic rich intervals of Aptian, Albian and Turonian aged core samples from DSDP site 364 offshore Angola, DSDP well 530A north of the Walvis Ridge offshore Namibia, and DSDP well 361 offshore South Africa. The analytical program included TOC, Rock-Eval, pyrolysis GC, bulk kinetics and micro-scale sealed vessel pyrolysis (MSSV) experiments. The results were used to determine differences in the source rock petroleum type organofacies, petroleum composition, gas/oil ratio (GOR) and pressure-volume-temperature (PVT) behavior of hydrocarbons generated from these black shales for petroleum system modeling purposes. The investigated Aptian and Albian organic rich shales proved to contain excellent quality marine kerogens. The highest source rock potential was identified in sapropelic shales in DSDP well 364, containing very homogeneous Type II and organic sulfur rich Type IIS kerogen. They generate P-N-A low wax oils and low GOR sulfur rich oils, whereas Type III kerogen rich silty sandstones of DSDP well 361 show a potential for gas/condensate generation. Bulk kinetic experiments on these samples indicate that the organic sulfur contents influence kerogen transformation rates, Type IIS kerogen being the least stable. South of the Walvis Ridge, the Turonian contains predominantly a Type III kerogen. North of the Walvis Ridge, the Turonian black shales contain Type II kerogen and have the potential to generate P-N-A low and high wax oils, the latter with a high GOR at high maturity. Our results provide the first compositional kinetic description of Cretaceous organic rich black shales, and demonstrate the excellent source rock potential, especially of the Aptian-aged source rock, that has been recognized in a number of the South Atlantic offshore basins.
    Keywords: Deep Sea Drilling Project; DSDP
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 2
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    PANGAEA
    In:  Supplement to: Stapel, Janina Gabriele; Schirrmeister, Lutz; Overduin, Pier Paul; Wetterich, Sebastian; Strauss, Jens; Horsfield, Brian; Mangelsdorf, Kai (2016): Microbial lipid signatures and substrate potential of organic matter in permafrost deposits: Implications for future greenhouse gas production. Journal of Geophysical Research: Biogeosciences, 121, 15 pp, https://doi.org/10.1002/2016JG003483
    Publication Date: 2023-01-13
    Description: A terrestrial permafrost core from Buor Khaya in northern Siberia comprising deposits of Late Pleistocene to Early Holocene age has been investigated to characterize living and past microbial communities with respect to modern and paleoclimate environmental conditions and to evaluate the potential of the organic matter (OM) for greenhouse gas generation. Microbial life markers?intact phospholipids and phospholipid fatty acids?are found throughout the entire core and indicate the presence of living microorganisms also in older permafrost deposits. Biomarkers for past microbial communities (branched and isoprenoid glycerol dialkyl glycerol tetraether as well as archaeol) reveal links between increased past microbial activity and intervals of high OM accumulation accompanied by increased OM quality presumably caused by local periods of moister and warmer environmental conditions. Concentrations of acetate as an excellent substrate for methanogenesis are used to assess the OM quality with respect to microbial degradability for greenhouse gas production. For this purpose two acetate pools are determined: the pore water acetate and OM bound acetate. Both depth profiles reveal similarities to the OM content and quality indicating a link between the amount of the stored OM and the potential to provide substrates for microbial greenhouse gas production. The data suggest that OM stored in the permafrost deposits is not much different in terms of OM quality than the fresh surface organic material. Considering the expected increase of permafrost thaw due to climate warming, this implies a potentially strong impact on greenhouse gas generation from permafrost areas in future with positive feedback on climate variation.
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 3
    Publication Date: 2023-06-27
    Keywords: Acetate; Acyclic glycerol dialkyl glycerol tetraether; Archaeol; AWI Arctic Land Expedition; BK-8; Branched glycerol dialkyl glycerol tetraether; Buor-Khaya Bay, Laptev Sea Coast, Russia; Carbon, organic, total; Carbon/Nitrogen ratio; DEPTH, sediment/rock; Hydrogen index, mass HC, per unit mass total organic carbon; Lena2011; Nitrate; Oxygen index, mass CO2, per unit mass total organic carbon; Phospholipid fatty acids; Phospholipids, per unit sediment dry mass; Ratio; RCD; Rotary core drilling; RU-Land_2011_Lena; Sample ID; Sulfate; δ13C, organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 360 data points
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  • 4
    Publication Date: 2023-06-27
    Keywords: 40-361; 40-364; 75-530A; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Factor; Glomar Challenger; Leg40; Leg75; Number; Percentage; Sample code/label; South Atlantic; South Atlantic/RIDGE; South Atlantic/SYNCLINE; Stage
    Type: Dataset
    Format: text/tab-separated-values, 346 data points
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  • 5
    Publication Date: 2023-06-27
    Keywords: 40-361; 40-364; 75-530A; Area/locality; Carbon, organic, total; Carbon dioxide yield, S3 per unit sediment mass; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Hydrocarbon yield, S1 per unit sediment mass; Hydrocarbon yield, S2 per unit sediment mass; Hydrogen index, mass HC, per unit mass total organic carbon; Leg40; Leg75; Lithology/composition/facies; Number; Oxygen index, mass CO2, per unit mass total organic carbon; Petroleum potential; Production index, S1/(S1+S2); Pyrolysis temperature maximum; Rock eval pyrolysis (Behar et al., 2001); Sample code/label; Sample ID; South Atlantic; South Atlantic/RIDGE; South Atlantic/SYNCLINE; Stage
    Type: Dataset
    Format: text/tab-separated-values, 435 data points
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  • 6
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    PANGAEA
    In:  Supplement to: Mangelsdorf, Kai; Zink, Klaus-Gerhard; di Primio, Rolando; Horsfield, Brian (2011): Microbial lipid markers within and adjacent to Challenger Mound in the Belgica carbonate mound province, Porcupine Basin, offshore Ireland (IODP Expedition 307). Marine Geology, 282(1-2), 91-101, https://doi.org/10.1016/j.margeo.2010.05.007
    Publication Date: 2023-06-27
    Description: During the Integrated Ocean Drilling Program (IODP) Expedition 307 for the first time a cold-water coral carbonate mound was drilled down through its base into the underlying sediments. In the current study, sample material from within and below Challenger Mound, located in the Belgica carbonate mound province in the Porcupine Basin offshore Ireland, was investigated for its distribution of microbial communities and gas composition using biogeochemical and geochemical approaches to elucidate the question on the initiation of carbonate mounds. Past and living microbial populations are lower in the mound section compared to the underlying sediments or sediments of an upslope reference site. A reason for this might be a reduced substrate feedstock, reflected by low total organic carbon (TOC) contents, in the once coral dominated mound sequence. In contrast, in the reference site a lithostratigraphic sequence with comparatively high TOC contents shows higher abundances of both past and present microbial communities, indicating favourable living conditions from time of sedimentation until today. Composition and isotopic values of gases below the mound base seem to point to a mixed gas of biogenic and thermogenic origin with a higher proportion of biogenic gas. Oil-derived hydrocarbons were not detected at the mound site. This suggests that at least in the investigated part of the mound base the upward flow of fossil hydrocarbons, being one hypothesis for the initiation of the formation of carbonate mounds, seems to be only of minor significance.
    Keywords: 307-U1317A; 307-U1317D; 307-U1318A; 307-U1318B; DRILL; Drilling/drill rig; Exp307; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; Porcupine Basin Carbonate Mounds
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 7
    Publication Date: 2023-07-10
    Keywords: AWI Arctic Land Expedition; BK-8; Buor-Khaya Bay, Laptev Sea Coast, Russia; Chain length distribution; DEPTH, sediment/rock; Lena2011; Meta- and paraxylene; n-octene; Phenols; RCD; Rotary core drilling; RU-Land_2011_Lena; Sample ID
    Type: Dataset
    Format: text/tab-separated-values, 35 data points
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  • 8
    Publication Date: 2023-06-27
    Keywords: 307-U1317A; 307-U1317D; C1/(C2+C3) hydrocarbon ratio; Carbon dioxide; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Ethane; Event label; Exp307; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Isobutane; Isobutane/n-Butane ratio; Joides Resolution; Methane; n-Butane; Porcupine Basin Carbonate Mounds; Propane; Sample code/label; δ13C, methane; δ Deuterium, methane
    Type: Dataset
    Format: text/tab-separated-values, 158 data points
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  • 9
    Publication Date: 2023-06-27
    Keywords: 307-U1318A; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Exp307; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; Phosphatidylethanolamine, per unit mass total organic carbon; Phosphatidylethanolamine, per unit sediment dry mass; Phosphatidylglycerol, per unit mass total organic carbon; Phosphatidylglycerol, per unit sediment dry mass; Phospholipids, per unit mass total organic carbon; Phospholipids, per unit sediment dry mass; Porcupine Basin Carbonate Mounds; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 54 data points
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  • 10
    Publication Date: 2023-11-30
    Keywords: 307-U1317A; 307-U1317D; Carbon, organic, total; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Exp307; Hopane, alpha/beta, per unit sediment dry mass; Hopane, alpha/beta, per unit sediment dry mass on a carbonate free base; Hopane, alpha/beta, total organic carbon; Hopane, beta/beta, per unit sediment dry mass; Hopane, beta/beta, per unit sediment dry mass on a carbonate free base; Hopane, beta/beta, total organic carbon; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; n-Alkane C23-35, per unit sediment dry mass; n-Alkane C23-35, per unit sediment dry mass on a carbonate free base; n-Alkane C23-35, total organic carbon; Porcupine Basin Carbonate Mounds; Sample code/label; Total hopanoids, per unit sediment dry mass; Total hopanoids, per unit sediment dry mass on a carbonate free base; Total hopanoids, total organic carbon; δ13C, organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 318 data points
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