Seafloor hydrothermal chimneys are significant metal resources and have fundamental effects on marine chemistry balance.Previous studies on growth of the chimneys focused on mineral composition and elemental distribut...Seafloor hydrothermal chimneys are significant metal resources and have fundamental effects on marine chemistry balance.Previous studies on growth of the chimneys focused on mineral composition and elemental distribution in chimney walls,but the isotopic composition of different elements and their correlations remain poorly understood.Here,we report lateral Fe and S isotopes from sulfides across a chimney wall in detail from the Deyin-1 hydrothermal field(DHF) on the South Mid-Atlantic Ridge.Pyrite was characterized by increases in both δ34S and δ56Fe from the exterior to the interior within the chimney wall,which is likely related to enhanced S and Fe isotope fractionation between pyrite and fluids derived from the temperature gradient.Furthermore,δ56Fe displayed a well-defined,linear,positive correlation with δ34S in pyrite from the DHF as well as in pyrite from other areas.A model of hydrothermal pyrite formation suggests that,under conditions with uniform hydrothermal fluid,different temperatures and similar pyrite-fluid exchange degrees could result in the observed linear relationships between δ34S and δ56Fe.The regular and coupled Fe-S isotope variations within the chimney wall efficiently constrain the process of hydrothermal sulfide formation.展开更多
基金supported by the Strategic Priority Research Program (B) of Chinese Academy of Sciences (XDB42000000)the National Natural Science Foundation of China (41806061)+3 种基金the National Key Research & Development Program of China (2016YFC0600408)the Strategic Priority Research Program (A) of the Chinese Academy of Sciences (XDA22050103)the Taishan Scholar Program of Shandong (ts201712075)the AoShan Talents Cultivation Program supported by Qingdao Pilot National Laboratory for Marine Science and Technology (2017ASTCPOS07)。
文摘Seafloor hydrothermal chimneys are significant metal resources and have fundamental effects on marine chemistry balance.Previous studies on growth of the chimneys focused on mineral composition and elemental distribution in chimney walls,but the isotopic composition of different elements and their correlations remain poorly understood.Here,we report lateral Fe and S isotopes from sulfides across a chimney wall in detail from the Deyin-1 hydrothermal field(DHF) on the South Mid-Atlantic Ridge.Pyrite was characterized by increases in both δ34S and δ56Fe from the exterior to the interior within the chimney wall,which is likely related to enhanced S and Fe isotope fractionation between pyrite and fluids derived from the temperature gradient.Furthermore,δ56Fe displayed a well-defined,linear,positive correlation with δ34S in pyrite from the DHF as well as in pyrite from other areas.A model of hydrothermal pyrite formation suggests that,under conditions with uniform hydrothermal fluid,different temperatures and similar pyrite-fluid exchange degrees could result in the observed linear relationships between δ34S and δ56Fe.The regular and coupled Fe-S isotope variations within the chimney wall efficiently constrain the process of hydrothermal sulfide formation.
