Mather, Ian D; Wellsbury, Peter; Parkes, R John; Maxwell, James R (2001): Concentration of C2-C6 hydrocarbon gases in dry sediments of ODP Sites 180-1109 and 180-1115 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.787065, Supplement to: Mather, ID et al. (2001): Purge-trap analysis of sediments of the western Woodlark Basin, Sites 1109 and 1115. In: Huchon, P; Taylor, B; Klaus, A (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 180, 1-14, https://doi.org/10.2973/odp.proc.sr.180.171.2001
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Abstract:
Low molecular weight hydrocarbon (LMWH) distributions were examined in sediments from Sites 1109 and 1115 in the western Woodlark Basin using purge-trap thermal adsorption/desorption gas analysis. A number of different hydrocarbon components >C1, which were not detected during shipboard gas analysis, were detected at both sites using the purge-trap procedure. Concentrations of ethane, propane, and butane remained relatively low (<100 pmol/g) throughout Site 1109 and had no consistent trend with depth. In contrast, the longer-chain components increased in concentration with depth. Hexane concentrations rose to 716 pmol/g at the base of the site with a concomitant increase in both 2-methyl- and 3-methylpentane. At Site 1115, concentrations of ethane, propane, butane, and isobutylene + 1-butene remained low (<60 pmol/g) throughout the site and again had no consistent trend with depth. 2-Methylpentane, 3-methylpentane, and hexane concentrations had a subsurface maximum that coincided with sediments containing abundant plant-rich material. The LMWH downhole profiles plus low in situ temperatures suggest that the LMWH components were formed in situ by low-temperature biological processes. Purge-trap analysis has indicated the presence of some unexpected deep low-temperature bacterial reactions, which demonstrates that further analysis of LMWH may provide valuable information at future Ocean Drilling Program sites.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -9.348162 * Median Longitude: 151.573590 * South-bound Latitude: -9.506600 * West-bound Longitude: 151.573200 * North-bound Latitude: -9.189700 * East-bound Longitude: 151.574150
Date/Time Start: 1998-06-24T16:30:00 * Date/Time End: 1998-07-22T22:30:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Mather, ID; Wellsbury, P; Parkes, RJ et al. (2001): (Table T1) Concentrations of C2-C6 hydrocarbon gases in ODP Site 180-1109 dry sediments. https://doi.org/10.1594/PANGAEA.787062
- Mather, ID; Wellsbury, P; Parkes, RJ et al. (2001): (Table T2) Concentrations of C2-C6 hydrocarbon gases in ODP Site 180-1115 dry sediments. https://doi.org/10.1594/PANGAEA.787064