Methane concentrations (uncorrected for sediment porosity and Bunsen coefficient) in headspace gas prepared from gravity core GeoB22039-2 recovered from the Royal Trough, South Georgia (cruise M134)

Gravity cores were collected during cruise M134 in 2017 from the Royal Trough and the Cumberland Bay, off South Georgia. In order to determine distributions of light hydrocarbons and characterize biogeochemical zonations in the shallow sediments, sediment samples were taken from gravity cores with cut-off syringes and transferred into glass vials to generate a headspace gas volume. The headspace gas samples were analyzed for their concentrations of methane and other light hydrocarbons by use of a gas chromatograph equipped with a capillary column and a flame ionization detector.2017年M134航次期间，于南乔治亚岛外海的皇家海槽与坎伯兰湾采集重力岩芯（gravity cores）。为探明浅层沉积物内轻烃的分布规律并表征其生物地球化学分带特征，研究人员通过截切注射器采集重力岩芯中的沉积物样品，将样品转移至玻璃小瓶以制备顶空气体。随后采用搭载毛细管柱与火焰离子化检测器的气相色谱仪，对顶空气体样品中的甲烷及其他轻烃浓度开展分析检测。