isotopic composition of gases and interstitial fluides of ODP Site 104-644

Pleistocene- to middle Miocene-age sediment was drilled at Site 341 (67 infinity 20.1'N, 6 infinity 06.6'E) on the inner Voring Plateau during Leg 38 of the Deep Sea Drilling Project (DSDP). In 1985, the Ocean Drilling Program (ODP) returned to the inner Wring Plateau near Site 341 and drilled a new hole at Site 644 (66° 40.7'N, 4° 34.6'E) as part of a transect to study Norwegian Sea paleoenvironments. In Hole 341, gas expansion pockets formed in cores which were recovered from depths below 50 m. This gas was characterized as predominantly methane with delta13C values in the range of -87 to -77 per mil (Morris, 1976, doi:10.2973/dsdp.proc.38.124.1976). At Site 644, sediment gas and pore-water samples were obtained to study the geochemistry of methanogenesis. Of particular interest is the possibility that methane hydrate might be present in these sediments.

更新世至中中新世的沉积物于深海钻探计划（Deep Sea Drilling Project, DSDP）第38航次期间，在沃林高原（Voring Plateau）内侧的341站位（北纬67°20.1′、东经6°06.6′）被钻探获取。1985年，大洋钻探计划（Ocean Drilling Program, ODP）重返341站位附近的沃林高原内侧区域，作为挪威海古环境研究断面的一部分，在644站位（北纬66°40.7′、东经4°34.6′）钻取了新钻孔。在341钻孔中，从50米以下深度获取的岩芯内形成了气体膨胀囊。该气体以甲烷为主，其碳同位素δ¹³C值介于-87‰至-77‰之间（Morris, 1976, doi:10.2973/dsdp.proc.38.124.1976）。在644站位，研究人员获取了沉积物气体与孔隙水样品，以开展甲烷生成的地球化学研究。尤为值得关注的是，这些沉积物中可能存在甲烷水合物（methane hydrate）。