Heat flux results of RV MARIA S. MERIAN cruise MSM69

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.

本报告所呈现的热流测量数据，采集于德国研究船玛利亚·S·梅里安号（RV Maria S. Merian）执行的MSM69航次，作业时段为2017年11月14日至2017年12月22日。本次任务共成功完成69组热流测量（对应剖面HF1760至HF1767），测量点位与iLAB反射地震剖面完全重合。本次测量的核心研究目标为：探究洋壳基底未被沉积物覆盖的海底区域是否存在低温热液流体的扩散现象。尽管低热流测量结果明确证实冷海水会渗入地下，但在所有测量点位均未检测到热液流体的弥散性渗漏。