The chemical and isotopic compositions of methane hydrates from the Dongsha Sea Area, northern South China Sea

Eight methane hydrate samples for analysis of gas compositions, bulk stable isotopes and methane clumped isotope are collected from the Site GMGS2-08 during the second Gas Hydrate Drilling Expedition of Guangzhou Marine Geological Survey (GMGS2), Dongsha Sea area of northern South China Sea. Abundances of singly and doubly-substituted isotopologues of methane (13CH4, 12CH3D, 13CH3D, and 12CH2D2) are measured on a Panorama (Pan004), an ultra–high–resolution gas–source multiple collector Mass Spectrometer at Guangzhou Institute of Geochemistry (GIG).