10.1594/PANGAEA.953903Pape, ThomasThomasPape0000-0002-6872-2144Malnati, JaniceJaniceMalnatiTseng, YitingYitingTseng0000-0001-7584-8733Bohrmann, GerhardGerhardBohrmann0000-0001-9976-4948PANGAEA2023Calabrian accretionary prismHeadspace GasIonian SeaMediterranean Ridge accretionary complexMethane concentrationpore water dissolved methaneR/V SONNESartori mud volcanoSO278stable carbon isotopestable hydrogen isotope (0)Optional event labelDevice typeSample typeDEPTH, sediment/rockMethaneMultiCorerGas chromatographySO278Sonne_2Center for Marine Environmental Sciences (MARUM)2020-11-18T07:30:02Dataset10.3389/feart.2023.118138010.48433/cr_so27860 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalShallow sediment cores were collected with a gravity corer and a multi corer from several sites at the Sartori Mud Volcano in the Calabrian accretionary prism during cruise SO278 with R/V SONNE. In order to determine ex-situ concentrations and stable C and H isotopic compositions of methane dissolved in pore water, sediment samples were taken from the sediment cores with cut-off syringes and transferred into glass vials. Methane concentrations in the headspace gas were determined by use of gas chromatography (GC) and used to calculate concentrations of methane dissolved in pore water (uncorrected for sediment porosity and Bunsen coefficient). Stable C and H isotopic compositions of methane were determined by use of GC-isotope ratio mass spectrometry.17.6182838.20523Mediterranean SeaGerman Research Foundationhttps://doi.org/10.13039/501100001659390741603EXC 2077: The Ocean Floor – Earth's Uncharted Interface