Freeze-induced crystallization: An overlooked pathway for mineral genesis in natural waters

• 成果类型: Article
• 署名作者: Won, Younghoon; Lee, Sungsik; Lee, Seungyeol; Park, Sohyun; Lim, Jun; Choi, Wonyong; Lee, Giehyeon
• 署名单位: Yonsei University; United States Department of Energy (DOE); Argonne National Laboratory; Chungbuk National University; University of Munich; Pohang University of Science & Technology (POSTECH)
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-15266
• DOI: 10.1073/pnas.2421822122
• 发表日期: 2025-06-03
• 关键词: rhodochrosite mnco3; oxidation-kinetics; co2-h2o solutions; frozen solution; iron-oxides; manganese; ice; mn(ii); solubility; precipitation

摘要

Natural ice plays salient roles in making the Earth habitable and sustainable. Previously overlooked, its role in chemical processes is now of emerging interest, particularly due to the freeze concentration effect, which can substantially promote chemical reactions during ice formation. We demonstrate here that ice formation can serve as a dynamic and unique pathway for mineral genesis. Freezing solutions containing dissolved manganese conditions. At room temperature, by contrast, this occurred when the solution saturation level was increased by ca. 30,000 times. The cryogenic rhodochrosite formed spherical aggregates of nano- polycrystallites, distinctly different from the cubic monocrystalline particles observed at room temperature. The distinct feature likely resulted from the combined effects of the intensified supersaturation induced by the freeze concentration effect and the low temperatures within liquid- like layers, conditions that make liquid- like layers an exceptional environment for mineral genesis, unlike typical natural water systems. The cryogenic rhodochrosite formation was successfully demonstrated using within the cryosphere and contributing to minerals with distinguishing properties and reactivities in the environment.