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Bacteriohopanepolyols as tracers for continental and marine organic matter supply and phases of enhanced nitrogen cycling on the late Quaternary Congo deep sea fan

Lookup NU author(s): Dr Luke Handley, Dr Helen Talbot, Dr Martin Cooke, Katie Anderson, Professor Thomas Wagner

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Abstract

Few studies have successfully identified bacteriohopanepolyols (BHPs) in continuous sedimentary records older than 100 ka. Here we expand significantly on previous work and report high resolution records of a variety of fully functionalised BHPs from ODP Site 1075 in the Congo deep sea fan BHPs are present throughout the core in sediments up to ca. 1 2 Ma, including composite and unsaturated homologues Although adenosylhopane, a proposed tracer for soil organic matter input, seems to undergo significant diagenesis with increasing depth below 65 m below the sea floor (mbsf), most BHPs appear to be relatively resilient to degradation, highlighting their potential as sedimentary tracers for past bacterial population distributions An unusual unsaturated BHT-cyclitol ether is present in high concentration between 500 and 600 ka and is interpreted as a possible biomarker for nitrogen-fixing Trichodesmium cyanobacteria. This previously unrecognised ecosystem change may have been partially driven by a decrease in nutrient supply to surface waters, resulting in more intense pelagic N fixation.


Publication metadata

Author(s): Handley L, Talbot HM, Cooke MP, Anderson KE, Wagner T

Publication type: Article

Journal: Organic Geochemistry

Year: 2010

Volume: 41

Issue: 9

Pages: 910-914

Print publication date: 30/04/2010

ISSN (print): 0146-6380

ISSN (electronic): 1873-5290

Publisher: Pergamon

URL: http://dx.doi.org/10.1016/j.orggeochem.2010.04.016

DOI: 10.1016/j.orggeochem.2010.04.016

Notes: Proceedings of the 24th International Meeting on Organic Geochemistry


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