Bacteriohopanepolyol biomarkers of sediments from the Congo fan

The transport and deposition of terrestrially derived organic matter (TOM) into the ocean is an important but poorly constrained aspect of the modern global carbon cycle. A preliminary study of Late Quaternary sediments from the Congo deep sea fan (ODP leg 175, site 1075, 2 km water depth) and four...

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Bibliographic Details
Main Authors: Cooke, M P, Talbot, Helen M, Wagner, Thomas
Format: Dataset
Language:English
Published: PANGAEA 2008
Subjects:
175-1075
Benguela Current
South Atlantic Ocean
COMPCORE
Composite Core
Eastern Niger fan
GeoB4901-2
GeoB4909-7
GeoB4913-4
GeoB4917-2
Joides Resolution
Leg175
M41/1
Meteor (1986)
MUC
MultiCorer
northern Congo fan
Ocean Drilling Program
ODP
off Angola
off Gabun
PROFILUR
PROFILUR Lander
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.757489
https://doi.org/10.1594/PANGAEA.757489
Description
Summary:The transport and deposition of terrestrially derived organic matter (TOM) into the ocean is an important but poorly constrained aspect of the modern global carbon cycle. A preliminary study of Late Quaternary sediments from the Congo deep sea fan (ODP leg 175, site 1075, 2 km water depth) and four surface samples from associated cores has confirmed the presence of proposed soil-specific bacteriohopanepolyol biomarkers (BHPs) including adenosylhopane, in samples to a depth of 89 m. Concentrations of soil marker BHPs are high in the upper sediment section (to 49 m) and the closest related surface sample (4913), supporting the case for these molecular markers as novel proxies for soil organic carbon (SOC) supply via riverine transport and subsequent burial. Distinct peaks for the markers at about 21, 34 and 60 m below surface level tentatively imply that the rate of TOM discharge from tropical Africa significantly increased at these times, possibly associated with periods of reduced soil stability in the Congo catchment.

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