The influence of hydrothermal activity during the origin of Co-rich manganese crusts of the N-W PacificPavel Mikhailik, Alexandr Khanchuk, Evgenii Mikhailik, Yuliya Ivanova and Maxim BlokhinE3S Web Conf., 98 (2019) 08016DOI: https://doi.org/10.1051/e3sconf/20199808016