Porosity of MeBo sediment cores from the continental margin off Svalbard - cruise MSM57

During expedition MARIA S. MERIAN MSM57/2 to the Svalbard margin offshore Prins Karls Forland, the seafloor drill rig MARUM‐MeBo70 was used to assess the landward termination of the gas hydrate system in water depths between 340 and 446 m. The study region shows abundant seafloor gas vents, clustered at a water depth of ∼400 m. The sedimentary environment within the upper 100 m below seafloor (mbsf) is dominated by ice‐berg scours and glacial unconformities. Sediments cored included glacial diamictons and sheet‐sands interbedded with mud. Seismic data show a bottom simulating reflector terminating ∼30 km seaward in ∼760 m water depth before it reaches the theoretical limit of the gas hydrate stability zone (GHSZ) at the drilling transect. We present results of the first in situ temperature measurements conducted with MeBo70 down to 28 mbsf. The data yield temperature gradients between ∼38°C km−1 at the deepest site (446 m) and ∼41°C km−1 at a shallower drill site (390 m). […]

在玛丽亚·施莱弗·梅里安（MARIA S. MERIAN）MSM57/2探险活动中，针对位于普林茨·卡尔·福兰德的斯瓦尔巴德边缘离岸区域，利用MARUM－MeBo70海底钻探装置对340至446米水深范围内的天然气水合物系统的陆缘终止进行了评估。研究区域展现出丰富的海底气喷口，这些喷口在约400米水深处聚集。海底以下100米（mbsf）的沉积环境主要由冰山冲刷和冰川不整合层构成。采集的沉积物岩心包括冰川层状杂岩和泥质夹层的席状沙。地震数据显示，底部模拟反射器在抵达钻探剖面的理论天然气水合物稳定性区（GHSZ）极限前约30公里处终止，该极限位于约760米水深。本研究呈现了使用MeBo70在28 mbsf处进行的首次原位温度测量结果。数据显示，从最深站点（446米）的约38°C km−1至较浅钻探站点（390米）的约41°C km−1，存在温度梯度。 [...]