TY - JOUR TI - Occurrence and precipitation mechanism of silver in pyrite from chimney fragments in the Edmond hydrothermal field, Central Indian Ridge AU - Zhang, Huichao AU - Chen, Kean AU - Tao, Chunhui AU - Alveirinho Dias, Ágata AU - Liang, Jin AU - Yang, Weifang AU - Liao, Shili AU - An, Fang AU - Yin, Bohao AU - Sun, Chuanqiang T2 - Ore Geology Reviews DA - 2023/05// PY - 2023 DO - 10.1016/j.oregeorev.2023.105471 DP - DOI.org (Crossref) SP - 105471 J2 - Ore Geology Reviews LA - en SN - 01691368 UR - https://linkinghub.elsevier.com/retrieve/pii/S0169136823001865 Y2 - 2023/05/10/03:57:57 ER - TY - JOUR TI - Hydrothermal remobilization of subseafloor sulfide mineralization along mid-ocean ridges contributes to the global oceanic zinc isotopic mass balance AU - Liao, Shili AU - Tao, Chunhui AU - Wen, Hanjie AU - Yang, Weifang AU - Liu, Jia AU - Jamieson, John W. AU - Dias, Ágata Alveirinho AU - Zhu, Chuanwei AU - Liang, Jin AU - Li, Wei AU - Ding, Teng AU - Li, Xiaohu AU - Zhang, Huichao T2 - Geochimica et Cosmochimica Acta AB - Hydrothermal activity on mid-ocean ridges is an important mechanism for the delivery of Zn from the mantle to the surface environment. Zinc isotopic fractionation during hydrothermal activity is mainly controlled by the precipitation of Zn-bearing sulfide minerals, in which isotopically light Zn is preferentially retained in solid phases rather than in solution during mineral precipitation. Thus, seafloor hydrothermal activity is expected to supply isotopically heavy Zn to the ocean. Here, we studied sulfide-rich samples from the Duanqiao-1 hydrothermal field, located on the Southwest Indian Ridge. We report that, at the hand-specimen scale, late-stage conduit sulfide material has lower δ66Zn values (−0.05 ± 0.15 ‰; n = 19) than early-stage material (+0.13 ± 0.15 ‰; n = 10). These lower values correlate with enrichments in Pb, As, Cd, and Ag, and elevated δ34S values. We attribute the low δ66Zn values to the remobilization of earlier sub-seafloor Zn-rich mineralization. Based on endmember mass balance calculations, and an assumption of a fractionation factor (αZnS-Sol.) of about 0.9997 between sphalerite and its parent solution, the remobilized Zn was found consist of about 1/3 to 2/3 of the total Zn in the fluid that formed the conduit samples. Our study suggests that late-stage subsurface hydrothermal remobilization may release isotopically-light Zn to the ocean, and that this process may be common along mid-ocean ridges, thus increasing the size of the previously identified isotopically light Zn sink in the ocean. DA - 2022/10/15/ PY - 2022 DO - 10.1016/j.gca.2022.08.022 DP - ScienceDirect VL - 335 SP - 56 EP - 67 J2 - Geochimica et Cosmochimica Acta LA - en SN - 0016-7037 UR - https://www.sciencedirect.com/science/article/pii/S0016703722004410 Y2 - 2022/09/21/13:41:02 KW - Hydrothermal activity KW - Mid ocean ridge KW - Subsurface remobilization KW - Zinc isotopic mass balance ER -