Rock Magnetic Signatures of Hydrothermal Mineralization in the Trans‐Atlantic Geotraverse (TAG) Hydrothermal Field

The Ocean Drilling Program Leg 158 drill holes from the Trans-Atlantic Geotraverse hydrothermal field are investigated to understand rock magnetic signatures of mineralization. A composite columnar section has been constructed through hole correlation stratigraphic variation magnetomineralogy within stockwork. Isothermal remanent magnetization components unmixing, first-order reversal curve diagrams, low-temperature signatures, and electron microscopic analyses disclose minerals disparate occurrences related predominating mineralization reactions in three broad zones: For basaltic basements, serpentinization olivine phenocrysts during preliminary alteration produces magnetite, addition primary titanomagnetite; Chloritized silicified zone samples contain relict titanomagnetite exsolved magnetite that survived dissolution; Anhydrite sulfide dominated by hematite, likely oxidation polymetallic sulfides due exposure oxidative seafloor environments drilling. Our findings suggest potentially modifies properties deposits, which applies tomography sophisticated subseafloor vent structures prospecting massive (SMS) deposits therein. Meanwhile, we alert future deep-sea mining drilling may promote physicochemical SMS causing environmental risks. established ultimately contribute understanding situ geological preservation optimizing exploitation procedures future.