The palaeoecology of the latest Jurassic-earliest Cretaceous hydrocarbon seep carbonates from Spitsbergen, Svalbard

摘要: Latest Jurassic–earliest Cretaceous hydrocarbon seeps from Spitsbergen, Svalbard, are known to contain unusual fauna, lacking most of the species characteristic for roughly coeval seep deposits. This study summarizes and analyses fauna 16 carbonate bodies Spitsbergen explain its composition. The formed in a shallow epicontinental sea with widespread deposition fine-grained, organic-rich sediments. They spread over relatively large area positioned same interval, indicating seepage extensive areas palaeo-Barents Sea. is very rich low dominance, comprising 54 species, composition similar that Jurassic–Cretaceous normal-marine environments other Boreal seas. Seep-restricted not abundant represented by four only. Hokkaidoconchids possible siboglinid worm tubes high sulphide fluxes rare. Apart seep-restricted sulphide-mining lucinid thyasirid bivalves, chemosymbiosis was also source nourishment background solemyid nucinellid all which take infaunal sources. suggests weak flux. diversity dominance significant richness abundance typical water seeps.