EDIACARAN TO CAMBRIAN BIOMARKERS IN OLIGOTROPHIC BASINS OF THE EAST EUROPEAN PLATFORM
Samples from a suite of drill cores covering the Late Ediacaran to Early Cambrian transition across the East European Platform were selected for analysis. Our preliminary data show high hopane/sterane ratios indicative of bacterially dominated microbial communities within these shallow marine environments. This is in contrast to abundant algal steranes found in organic-rich rocks deposited during this time interval (Dutta et al., 2013). Similar to the organic-rich samples however C29 sterane remained the dominant sterane in our samples indicative of green algae being dominant within the eukaryotic phytoplankton population. Despite the low total organic carbon (TOC) (<0.3 weight % of TOC) we detected remnants of the 17β,21β(H)- biological stereochemistry consistent with these rocks having undergone a very mild thermal history and as such being ideal for organic geochemical investigation. We will discuss the details of the rich biomarker assemblages detected with respect to source biota and changing marine ecology through Late Ediacaran and Early Cambrian time.
Love et al. (2009) Nature 457, 718-722.
Dutta et al. (2013) Organic Geochemistry 56, 68–80.