Temperature vs depth profile at heat flux station HF1767 of RV MARIA S. MERIAN cruise MSM69@en

The heat flux measurements presented in this report were made during expedition MSM69 on the German research vessel RV Maria S. Merian (November 14, 2017 to December 22, 2017). A total of 69 heat flux measurements (profile HF1760 to profile HF1767) were successfully carried out colocated with the iLAB reflexion seismic profile. The aim of the measurements was to investigate whether low-temperature hydrothermal fluids diffuse at the seafloor where the oceanic basement is not covered by sediments. While low heat flux measurements clearly show that cold seawater enters the subsurface, no diffuse leakage of hydrothermal fluids could be detected at any location.本报告收录的热通量（heat flux）测量数据，采集于德国“玛利亚·梅里安号”（RV Maria S. Merian）科考船执行的MSM69航次期间，作业时间为2017年11月14日至2017年12月22日。本次任务共成功完成69组热通量测量，测线编号覆盖HF1760至HF1767，所有测量点位均与iLAB反射地震剖面（reflection seismic profile）同点位布设。本次测量的研究目的为探究：当大洋基底未被沉积物覆盖时，低温热液流体（hydrothermal fluids）是否会在海底发生扩散。尽管低热通量测量结果明确证实了冷海水渗入海底亚表层（subsurface），但在所有测量点位均未检测到热液流体的弥散性渗漏。