Worm Tubes in an Allochthonous Cold-Seep Carbonate From Lower Oligocene Rocks of Western Washington

Petrographic and geochemical characterization of seep carbonate from Bush Hill (GC 185) gas vent and hydrate site of the Gulf of Mexico

“…The botryoidal aragonite in seep carbonate usually arises from a nuclear mass of dark organic material, and was suggested to be induced by microbial activity (Roberts et al, 1993;Goedert et al, 2000). This hypothesis is in agreement with the negative stable carbon isotope values (as low as À29&).…”

Sedimentary fabrics in the authigenic carbonates from Bush Hill: implication for seabed fluid flow and its dynamic signature

“…But the formation of botryoidal aragonite at cold seep environments suggests a rapid precipitation because of the micro-oversaturation of bicarbonate induced by anaerobic methane oxidation. The supporting evidence includes: (i) laboratory simulations of the Gulf of Mexico slope seep environment reinforce the hypothesis that methanotrophic bacteria may be responsible for carbonate precipitation, especially for botryoidal aragonite (Roberts et al 1993); (ii) naturally occurring botryoidal aragonite in seep carbonate usually arising from a dark, organic-rich nucleus (Roberts et al 1993;Feng et al 2008b); and (iii) botryoidal aragonite cement usually yield the most negative d 13 C values in seep carbonate (Goedert et al 2000;Himmler et al 2008;Feng et al 2008a,b). Figure 4C illustrates that the botryoidal aragonite originated from peloids as the peloids show intense fluorescence and most probably are composed of bacterial aggregation.…”

“…Botryoidal aragonite is one of the typical carbonate fabrics in both modern and ancient seep carbonates (Roberts et al 1993;Goedert et al 2000;Peckmann et al 2001;Popa et al 2004;Himmler et al 2008). Methane-based microbial activity is not crucial for the formation of botryoidal aragonite (Peckmann et al 1999).…”

Geological Study of Active Cold Seeps in the Syn-collision Accretionary Prism Kaoping Slope off SW Taiwan

“…The remains of Pogonophora, especially its relatively soft potosoma and mesosoma, are not well preserved in sediments after death due to the relatively quick decomposition of chitin. In comparison, the carbonate metasoma of vestimentiferan can be preserved in marine sediments, especially those encrusted on hard grounds like authigenic carbonates (Goedert et al 2000). The morphology of metasoma suggests that there are at least two distinct species of Pogonophora in the study area (Fig.…”