Fredricks, Helen F. and Hinrichs, Kai-Uwe (2007): Data report; Intact membrane lipids as indicators of subsurface life in Cretaceous and Paleogene sediments from sites 1257 and 1258
Leg/Site/Hole:
Related Expeditions:
ODP 207
Identifier:
ID:
2007-087731
Type:
georefid
ID:
10.2973/odp.proc.sr.207.112.2007
Type:
doi
Creator:
Name:
Fredricks, Helen F.
Affiliation:
Woods Hole Oceanographic Institution, Department of Marine Chemistry and Geochemistry, Woods Hole, MA, United States
Role:
author
Name:
Hinrichs, Kai-Uwe
Affiliation:
Bundesanstalt fuer Geowissenschaften und Rohstoffe, Federal Republic of Germany
Role:
author
Identification:
Title:
Data report; Intact membrane lipids as indicators of subsurface life in Cretaceous and Paleogene sediments from sites 1257 and 1258
Year:
2007
Source:
In: Mosher, David C., Erbacher, Jochen, Malone, Mitchell J., Berti, Debora, Bice, Karen L., Bostock, Helen, Brumsack, Hans-Juergen, Danelian, Taniel, Forster, Astrid, Glatz, Christine, Heidersdorf, Felix, Henderiks, Jorijntje, Janecek, Thomas R., Junium, Christopher, Le Callonnec, Laurence, MacLeod, Kenneth G., Meyers, Philip A., Mutterlose, H. Joerg, Nishi, Hiroshi, Norris, Richard D., Ogg, James G., O'Regan, A. Matthew, Rea, Brice, Sexton, Philip, Sturt, Helen, Suganuma, Yusuke, Thurow, Juergen W., Wilson, Paul A., Wise, Sherwood W., Jr., Proceedings of the Ocean Drilling Program; scientific results; Demerara Rise; equatorial Cretaceous and Paleogene paleoceanographic transect, western Atlantic; covering Leg 207 of the cruises of the Drilling Vessel JOIDES Resolution; Bridgetown, Barbados, to Rio de Janeiro, Brazil; sites 1257-1261; 11 January-6 March 2003
Publisher:
Texas A&M University, Ocean Drilling Program, College Station, TX, United States
Volume:
207
Issue:
Pages:
Abstract:
We report results from the analysis of intact polar lipids (IPLs) in sediments from Ocean Drilling Program Sites 1257 and 1258. IPLs, constituting the cell membranes of living organisms, were detected in organic-lean sediments but not in underlying organic-rich black shales. Microbial activity in organic-lean sediments is likely due to sulfate-dependent oxidation of methane whereas difficulties detecting IPLs in black shales are interpreted to result from unfavorable signal-to-noise ratios due to low cell concentrations in combination with extremely high analytical noise created by uncharacterized organic matrix. IPLs found are consistent with a low-diversity community of archaea and bacteria. The concentrations of IPLs are more than one order of magnitude lower than those in Neogene deep subsurface sediments at the Peruvian margin, suggestive of significantly lower cell concentrations in Demerara Rise. This finding is consistent with inferred low rates of subsurface microbial activity.
Language:
English
Genre:
Serial
Rights:
URL:
Coverage: Geographic coordinates: North:9.2700 West:-54.4400 East:
-54.2100 South:9.2600
Keywords: Geochemistry of rocks, soils, and sediments; Archaea; Atlantic Ocean; bacteria; biogenic processes; biomarkers; black shale; boreholes; carbonate rocks; Cenozoic; chalk; chemical composition; clastic rocks; continental margin; cores; Cretaceous; Demerara Rise; Equatorial Atlantic; fatty acids; French Guiana; geochemistry; geomicrobiology; Leg 207; lipids; Mesozoic; North Atlantic; Northwest Atlantic; Ocean Drilling Program; ODP Site 1257; ODP Site 1258; organic acids; organic compounds; Paleogene; sedimentary rocks; South America; Surinam; Tertiary; western Equatorial Atlantic;
.