(Table T2) Relative signal intensity of intact polar lipids in sediments from ODP Sites 207-1257 and 207-1258

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 or...

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Bibliographic Details
Main Authors: Fredricks, Helen F, Hinrichs, Kai-Uwe
Format: Dataset
Language:English
Published: PANGAEA 2007
Subjects:
207-1257
207-1258
COMPCORE
Composite Core
DEPTH
sediment/rock
Diacylglycerol-phosphatidylcholine
Diacylglycerol-phosphatidyldimethylethanolamine
Diethylglycerol-diglycosyl
Diglycosyl-glycerol dialkyl glycerol tetraether
DSDP/ODP/IODP sample designation
High Performance Liquid Chromatography - Mass spectrometry (HPLC-MS)
Intact polar lipid
Joides Resolution
Leg207
Lithology/composition/facies
Monoglycosyl-glycerol dialkyl glycerol tetraether
North Atlantic Ocean
Ocean Drilling Program
ODP
Sample code/label
Sample mass
Triglycosyl-glycerol dialkyl glycerol tetraether
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.776022
https://doi.org/10.1594/PANGAEA.776022
Description
Summary: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.

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