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Payeur, Amy L; Meyers, Philip A; Sacks, Richard D (2011): Organic geochemistry of sediments from sapropel 94 of ODP Hole 161-974C [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.818252, Supplement to: Payeur, AL et al. (2011): Evaluation of on-line pyrolysis two-dimensional gas chromatography time-of-flight mass spectrometry (Py–GC×GC–ToFMS) on whole sediments from a Mediterranean sapropel sequence. Organic Geochemistry, 42(10), 1263-1270, https://doi.org/10.1016/j.orggeochem.2011.07.008

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Abstract:
Analysis of the molecular composition of the organic matter (OM) from whole sediment samples can avoid analytical bias that might result from isolation of components from the sediment matrix, but has its own analytical challenges. We evaluated the use of GC * GC-ToFMS to analyze the pyrolysis products of six whole sediment samples obtained from above, within and below a 1 million year old OM-rich Mediterranean sapropel layer. We found differences in pyrolysis products <n-C22 between the OM-rich sapropel samples and the OM-poor background marls. The presence of alkyl pyrroles, probably derived from chlorophyll, in pyrolysates of the sapropels but not in those of the marls suggests that higher marine productivity and greater OM preservation accompanied deposition of the sapropels. Detection of tetramethyl benzenes considered to be pyrolysis products of isorenieratene in the sapropel samples is evidence that nitrogen-fixing green sulfur bacteria contributed to the high productivity. Greater abundances of shorter chain aliphatic hydrocarbons, pyrroles, furans and alkyl aromatics in the pyrolysates of sapropel samples relative to the marls confirm better preservation of marine OM in the sapropels. In addition, the presence of greater amounts of thiophenes in the sapropels than in the marls is consistent with the existence of euxinic conditions during sapropel deposition. The combination of whole sediment pyrolysis and GC × GC-ToFMS is promising, but the procedure requires careful selection of its multiple analytical variables, particularly the pyrolysis temperature and the operational features of the GC columns.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 40.355800 * Longitude: 12.142210
Date/Time Start: 1995-05-08T23:45:00 * Date/Time End: 1995-05-10T21:00:00
Event(s):
161-974C * Latitude: 40.355800 * Longitude: 12.142210 * Date/Time Start: 1995-05-08T23:45:00 * Date/Time End: 1995-05-10T21:00:00 * Elevation: -3464.0 m * Penetration: 204.5 m * Recovery: 199.85 m * Location: Tirreno Sea * Campaign: Leg161 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 22 cores; 204.5 m cored; 0 m drilled; 97.7 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Payeur, AL; Meyers, PA; Sacks, RD (2011): (Table 2) Alk-1-enes and alk-2-enes in pyrolyzates from insolation cycle 94 sapropel of ODP Hole 161-974C. https://doi.org/10.1594/PANGAEA.818245
  2. Payeur, AL; Meyers, PA; Sacks, RD (2011): (Table 4) Benzene and indane isomers in pyrolyzates from insolation cycle 94 sapropel of ODP Hole 161-974C. https://doi.org/10.1594/PANGAEA.818251
  3. Payeur, AL; Meyers, PA; Sacks, RD (2011): (Table 1) Average chain length of alkanes from insolation cycle 94 sapropel of ODP Hole 161-974C. https://doi.org/10.1594/PANGAEA.818241
  4. Payeur, AL; Meyers, PA; Sacks, RD (2011): (Table 3) Furans, thiophenes, pyrroles and naphthalenes in pyrolyzates from insolation cycle 94 sapropel of ODP Hole 161-974C. https://doi.org/10.1594/PANGAEA.818247