Dear friends! Please consider submiting an abstract and attending our session at Goldschmidt 2018 in Boston, USA:
07c: Controls, Patterns, and Consequences of Organic Matter Burial
Keynote: David Burdige (Old Dominion University)
The geologic record captures only a portion of the complex biogeochemical interactions involving marine primary productivity. Apparent decoupling between export production in the water column and burial of organic matter as observed in modern environments has led to strong debates on the fidelity of classic productivity proxies (Corg, excess-Ba, barite, organic-P, biogenic SiO2). Common problems are caused by variable reactivity of organic matter, diagenesis, changing accumulation rates, and oceanic anoxia leading to gaps in the paleorecords and artifacts reflecting differences in proxy preservation rather than actual changes in the export of organic matter. Disentangling individual processes is often challenging; however, growing interest in proxy development and state-of-the-art analyses has led to major breakthroughs. Biologically active trace elements (e.g., Cd, Cu, Fe, Ni, Zn), their emerging isotopic systems, and biomarkers can delineate changes in primary productivity through time. We welcome contributions related but not limited to reconstructions of organic burial and the broad implications for carbon cycling spanning the Mesozoic to recent using classic and emerging proxies. Those tracers include biologically active trace elements, their isotopes, and organic compounds. We also encourage related submissions on the geochemistry of settling particles and sediment chemistry, including pore waters in modern marine settings. Studies are also welcome that address preservation and transformation of productivity proxies via metabolic redox pathways both in the water column and marine sediments.
See you in Boston!