Samples collected from the Von Damm and Piccard hydrothermal vent fields with the Hydrothermal Organic Geochemistry sampler.

In January – February 2020, RV Atlantis cruise AT42-22 collected water, volatile, and fluid samples with ROV Jason from hydrothermal vent fields on the mid-Cayman rise. The expedition carried out 4 dives at the Von Damm field and 5 at the Piccard field. The first file is the sampling logs and fluid geochemistry from the Hydrothermal Organic Geochemistry (HOG) sampler. It includes sampling locations, depths, heading, volumes, the highest temperature recorded during sampling, the average fluid temperature recorded during sampling, and pH. The second file is the measured geochemistry of the fluids, including concentrations of hydrogen sulfide, dissolved inorganic carbon, formate, phosphate, nitrate, nitrite, ammonia, and the stable isotope composition (d13C) of dissolved inorganic carbon.