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Details
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Theme 10: Geobiology, Organic Tracers, and Biogeochemistry

10g: Carbon–sulfur–iron Biogeochemistry of Aquatic Sediments: Live Processes Versus Preserved Records

Conveners:      Aninda Mazumdar ([log in to unmask])

Wriddhiman Ghosh ([log in to unmask])

Abstract submission deadline:  March 30, 2018	Abstract Submission Deadline
Aquatic, especially marine, sediments are global sinks of organic carbon, and active hot-spots of integrated carbon-sulfur-and-iron cycling. In situ, microbe-mediated sulfate reduction, rendered via orgnaoclastic sulfate respiration (OSR) or anaerobic oxidation of methane (AOM), is coupled with the oxidation of organic matter and dissolution/precipitation of iron compounds (Fe-oxyhydroxides, Fe-sulfide, etc.). On the other hand, oxidation of reduced sulfur species, particularly sulfide, is harnessed with carbon dioxide fixation (into organic matter) or complex organic carbon degradation by chemolithoautotrophic or chemoorganoheterotrophic microorganisms, respectively. Concentrations and isotopic ratios of the various constituents of sediment pore-fluids/chemical-precipitates help decipher in situ biogeochmical pathways. Although significant information on the carbon-sulfur-iron cycles of modern marine and lacustrine sediments have been generated in this way, several questions regarding sulfur compounds oxidation/dispropotionation, relative importance of OSR and AOM in sulfate reduction, processes at sulfate-methane transition zones, etc. cannot be answered from preserved geochemical records alone. In this session we would attempt to improve the overall understanding of carbon-sulfur-iron cycles in aquatic sediments by integrating preserved geochemical records with the results obtained from in situ as well as in vitro geomicrobiological experiments. Emphasis would be on correlating microbial community structures/functions (revealed by meta-omics approaches) with geochemical parameters to establish realistic models of sedimentary biogeochemical processes.
Abstract submission
•	Each author may be the presenting author of only one standard abstract
•	Exceptions: Keynote and medalist speakers may present a second abstract. All authors may also present a second abstract in theme 14: Outreach and Education
•	The Abstract Deadline is March 30th (23:59 EST)
•	A non-refundable fee of US$110 is due for every abstract
•	Authors should ensure they use the downloadable MS Word template and the styles described here to prepare their abstracts
•	Abstracts may only be submitted online (not emailed or posted)
•	Abstracts may not exceed one page of the abstract template
•	Abstracts should be submitted in PDF format
•	The abstracts will be published in the Goldschmidt archive website, where they can be searched alongside all other Goldschmidt abstracts since 2000
•	Authors can edit their own files until the abstract deadline, after this an US$18 charge will be made by the conference for any changes made

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Dr. Aninda Mazumdar
Gas Hydrate research Group Geological Oceanography 
CSIRNational Institute of Oceanography 
DonaPaula Goa-403004 
Ph: 0832-2450620
Mobile:09764971004