U-Th chronology and formation controls of methane-derived authigenic carbonates from the Hola trough seep area, northern Norway
作者： Aivo Lepland , Diana Sahy , Tõnu Martma , Stephen R. Noble , Jasmin Schönenberger
DOI: 10.1016/J.CHEMGEO.2017.09.004
关键词:
摘要: Abstract We investigated methane-derived authigenic carbonate (MDAC) crusts and nodules from a cold seep site on the northern Norwegian continental shelf in ca. 220 m water depth to determine timing mode of their formation. Gas bubbling observed during remotely operated vehicle (ROV)-assisted sampling MDAC revealed ongoing activity. Authigenic carbonates were present as seafloor centimetre-size carbonate-cemented at several intervals within an adjacent sediment core. Aragonite-dominated mineralogy suggests formation close higher rates sulphate-dependent anaerobic oxidation methane (AOM). In contrast, dolomite-cemented are consistent with sulphate-methane-transition zone deeper lower AOM. The δ13C-carbonate values bulk rock micro-drilled aragonite samples vary between − 22.2‰ − 34.6‰ (VPDB). interpret carbon be mainly derived thermogenic methane, minor contribution seawater dissolved inorganic (DIC). AOM activity is supported by high concentrations AOM-related biomarkers archaea (archaeol 2-sn-hydroxyarchaeol) sulphate-reducing bacteria (iso anteiso-C15:0 fatty acids) crusts. dolomite exhibit (− 12‰ VPDB) suggesting smaller amount carbon, presumably due DIC migrating depth, rates. latter orders magnitude archaeol sn-2-hydroxyarchaeol interval containing largest nodules. δ18O pure indicate precipitation isotopic equilibrium no influence gas hydrate-derived water. U-Th dating two shows that they formed 1.61 ± 0.02 4.39 ± 1.63 ka BP 2.65 ± 0.02 4.32 ± 0.08 ka BP. infer both spatial temporal change flux related this site. These changes might caused regional seismic events can affect pore pressure or re-activation migration pathways thus facilitating fluid flow deep sources towards seabed.
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