A quantitative assessment of methane cycling in <scp>H</scp>ikurangi <scp>M</scp>argin sediments (<scp>N</scp>ew <scp>Z</scp>ealand) using geophysical imaging and biogeochemical modeling
Journal: Geochemistry Geophysics Geosystems
Year: 2016

Abstract Takahe seep, located on the Opouawe Bank, Hikurangi Margin, is characterized by a well‐defined subsurface seismic chimney structure ∼80,500 m 2 in area. Subseafloor geophysical data based on acoustic anomaly layers indicated the presence of gas hydrate and free gas layers within the chimney structure. Reaction‐transport modeling was applied to porewater data from 11 gravity cores to constrain methane turnover rates and benthic methane fluxes in the upper 10 m. Model results show that me