In-situ sulfur isotopic compositions of morphologically different pyrites from the SMAR (southern Mid-Atlantic Ridge) 26°S hydrothermal field, integrated with δ³⁴S and δ⁶⁵Cu values in associated chalcopyrite, reflect a recurring flux of magmatic-hydrothermal fluids and subsequent leaching by seawater. The δ³⁴S values of sulfides (−1.27 to +5.25‰) indicate mixing of magmatic sulfur with seawater sulfate-derived sulfur. Compared to other Mid-Ocean Ridge (MOR) hydrothermal vent sites, a significant contribution of magmatic fluids is herein distinctive. Three concentric mineralogical zones around the conduit in an inactive black smoker sample include an inner chalcopyrite-dominated zone, an intermediate zone of idiomorphic and massive pyrite, and an outermost zone of porous and colloform pyrite with/without traces of chalcopyrite. The systematic increase in δ³⁴S from the interior conduit (avg. −0.60‰, n = 8) through the intermediate zone (avg. +2.36‰, n = 14) to the exterior wall (avg. +3.02‰, n = 27), and contributions of seawater sulfate (0 to 10.7%, and to 18.6%, respectively) are most likely related to interaction between hydrothermal fluid and previously precipitated sulfides. A significant contribution of seawater sulfate-derived sulfur occurred likely via permeability or porosity upsurge across the chimney. Chalcopyrite with consistently positive δ⁶⁵Cu values (+0.17 to +0.48‰), which are typical of mid-ocean ridge (MOR) hydrothermal vent fluids, is suggestive of reaction/mixing with hydrothermal fluids. Sulfur and Cu isotopic compositions of chalcopyrite further imitate the significant contributions of magmatic gases in the formation of metalliferous seafloor massive sulfides.

从SMAR（南部大西洋中脊）形态不同黄铁矿的原位硫同位素组成26°S热液领域，随着δ集成³⁴ S和δ ^65个在相关联的黄铜矿的Cu值，反映岩浆热液流体的重复通量和随后被海水浸出。的δ ³⁴硫化物的S值（-1.27至+ 5.25‰）表明岩浆硫与海水硫酸盐衍生的硫混合。与其他中洋海脊（MOR）热液喷口相比，岩浆流体的显着贡献在这里是独特的。在不活动的黑烟样品中，导管周围的三个同心矿物学区域包括一个内部的以黄铜矿为主的区域，一个中间形的块状黄铁矿中间区域以及一个带有/不带有黄铜矿痕迹的多孔和大体状黄铁矿的最外层区域。在δ系统性增加³⁴上来自内部导管（平均-0.60‰，Ñ  = 8）通过所述中间区（平均+ 2.36‰，Ñ  = 14）到外部壁（平均+ 3.02‰，Ñ = 27），而海水中硫酸盐的贡献（分别为0至10.7％和18.6％）最可能与热液与先前沉淀的硫化物之间的相互作用有关。海水中硫酸盐衍生的硫的显着贡献可能是通过烟囱中的渗透性或孔隙率高涨引起的。黄铜矿具有一致的阳性δ ^65倍的Cu的值（0.17至0.48 +‰），这是典型的大洋中脊（MOR）热液喷口流体的，则提示反应/与热流体混合。黄铜矿的硫和铜同位素组成进一步模拟了岩浆气体在含金属海底块状硫化物形成中的重要作用。